# Fuse Symbols Explained: Electrical, Thermal, and Circuit Protection Symbols Learn how to identify fuse symbols in circuit diagrams, including electrical, thermal, resettable, and PCB fuse symbols, with practical circuit examples. Written by [Jharwin Barrozo](https://www.flux.ai/jharwinbarrozo) Published Oct 2026 - 8 min read ![Fuse Symbols Explained: Electrical, Thermal, and Circuit Protection Symbols](https://www.flux.ai/p/assets/blogs/fuse-symbols/main.webp) A fuse is an [overcurrent-protection device](https://www.flux.ai/p/blog/protection-circuit-101-securing-your-electronics-from-overcurrent-and-short-circuits), often designed for one-time use. When a fault causes enough current to flow for long enough, its internal element opens, disconnecting the circuit. In a schematic, a fuse symbol marks both the protective component and the point where that circuit can be interrupted. Fuse symbols vary between standards and schematic libraries. The quickest way to identify one is to look for a small symbol inserted **in series** with a power path, then check the associated reference designator and part details. A thermal fuse or resettable positive temperature coefficient thermistor (PTC) may appear nearby, but those devices respond differently and should not be treated as interchangeable. | **Device shown in a schematic** | **Visual identification** | **What to confirm** | | --- | --- | --- | | Conventional fuse | A small fuse body placed in the conductor | Reference designator and exact fuse part | | Thermal fuse | Fuse symbol with a thermal marking, or a clearly labeled thermal-cutoff part | Opening temperature and manufacturer specification | | Resettable PTC | A distinct PTC symbol or a labeled two-terminal component | Hold current, trip behavior, and operating temperature | | Circuit breaker | A switching/contact symbol, typically identified as a breaker | Trip rating and reset mechanism | ## What Does a Fuse Symbol Look Like? ![Three fuse symbols: the IEC 60617 rectangle on the conductor, the squiggle used in North American drawings, and a plain rectangle body used in some EDA libraries](https://www.flux.ai/p/assets/blogs/fuse-symbols/body-1.png) The general fuse symbol is a small, often rectangular shape in the middle of a line. In some standards, the fuse can look like a squiggle. In the [IEC 60617 symbol system](https://webstore.iec.ch/en/publication/2723), the general fuse symbol is a narrow rectangular body centered on the conductor. North American drawings and EDA libraries may use other fuse-body shapes or internal markings. The label and component record help resolve any ambiguity. A fuse commonly uses the reference-designator prefix **F**. `F1` identifies one fuse instance, `F2` another. The text beside `F1` might give a current rating, but that alone is not a complete specification. The bill of materials (BOM) should identify the selected part, including its voltage rating, response characteristics, and package or holder. | **Schematic feature** | **How to read it** | | --- | --- | | Plain continuous line | An electrical connection, not a fuse | | Fuse body inserted into a line | A protective component in series with that path | | `F1` or `F2` | A unique fuse reference designator | | Value or part number | The intended rating or selected physical component | A fuse symbol differs from a [resistor symbol](https://www.flux.ai/p/blog/resistor-symbols). Both are two-terminal components, but a resistor is selected to provide a defined resistance in normal operation. In contrast, a conventional fuse is selected to remain intact in normal operation and open under specified fault conditions (e.g., overcurrent). Both resistor symbols and fuse symbols can correspond to a rectangle, so make sure to look carefully — the fuse symbol will have a line through the rectangle, or two vertical lines on the ends. ## Common Types of Fuse Symbols **Cartridge fuses** are replaceable fuses often used with holders. A schematic may show the general fuse symbol. Then, the cartridge dimensions, response type, and holder will appear in the component or BOM details. The drawing does not need a different symbol for every cartridge size. **Thermal fuses**, also called thermal cutoffs, open when the device reaches a specified temperature. Some libraries provide a dedicated thermal-fuse symbol and others use a general protective-device symbol and a clear label. A thermal fuse protects against a temperature condition, which is different from that of a current fuse. Check the temperature rating, placement, and manufacturer instructions. **Resettable fuses** are often polymeric positive-temperature-coefficient devices, or **PPTCs**. Although “resettable fuse” is a common name, a PPTC does not behave like a conventional fuse that permanently opens. During a fault, it heats and moves to a much higher-resistance state, limiting current. Then, the PPTC can recover after the fault is removed and the device cools. Its hold and trip behavior depends on temperature, so engineers should identify it explicitly as a PTC rather than assuming that an ordinary `F1` symbol communicates its behavior. [Littelfuse’s PPTC guidance](https://www.littelfuse.com/assetdocs/littelfuse-fundamentals-of-resettable-functionality-in-pptc-devices-technical-paper?assetguid=7b82f0c7-cde5-4d89-9219-45b30d0fc2a5) emphasizes checking hold current at the expected ambient temperature. **Automotive fuses** may be blade, cartridge, or other vehicle-specific types. A circuit diagram can still use a general fuse symbol. The selected component and its location in the vehicle’s power distribution system matter more than drawing the physical blade shape. **Semiconductor fuses** are chosen for applications where the protected devices and fault conditions require a particular clearing performance. They may also use the general fuse symbol, with the precise fuse series and ratings specified in the design records. **PCB-mounted fuses** may be [surface-mount or through-hole](https://www.flux.ai/p/blog/smt-vs-through-hole) components soldered to a board. The [schematic symbol](https://www.flux.ai/p/blog/pcb-symbol-design) expresses their electrical role; the footprint and part number determine how they appear in the PCB layout. In every case, let the component data—not a decorative symbol variation—carry the exact specification. ## Fuse vs Circuit Breaker and Other Protection Symbols Protection components address different faults. Their symbols should help a reviewer see what each device is intended to do. | **Device** | **Primary purpose** | **Behavior after a fault** | **Typical use** | | --- | --- | --- | --- | | Conventional fuse | Interrupt specified overcurrent faults | One-time; replace after opening | Power-input and branch protection | | Circuit breaker | Interrupt specified overcurrent faults | Can usually be reset after the fault is addressed | Distribution and serviceable equipment | | Resettable PTC | Limit current after heating during a fault | May recover after cooling | Selected low-voltage ports and circuits | | Varistor (MOV) | Limit a voltage surge by becoming conductive | May degrade after repeated or severe surges | Transient protection at suitable inputs | | TVS diode | Clamp fast voltage transients | Normally returns to a nonconducting state if not overstressed | Sensitive input and interface protection | A circuit breaker is not simply a fuse that happens to be reusable: it has a different mechanism and its own ratings. Likewise, a PTC may continue to pass some current in its tripped, high-resistance state. A varistor or TVS diode principally addresses **voltage transients**, not the same sustained overcurrent condition a fuse is selected to interrupt. Some designs use these components together. For example, a fuse in series with an input and a surge suppressor connected across the appropriate nodes can provide different layers of protection—but the complete circuit must be evaluated for its actual fault conditions. ## Where Should a Fuse Be Placed in a Circuit? In a basic DC design, a fuse should be placed close to the power entry, in series with the power supply feeding the circuitry it is meant to protect: ![Schematic of fuse placement: the power input positive line connects through fuse F1 to the protected circuit, which connects to the return](https://www.flux.ai/p/assets/blogs/fuse-symbols/body-2.png) This placement aims to limit how much downstream wiring and circuitry are unprotected before the fuse. A fuse connected in parallel with the supply would be ineffective. Further, placing a fuse somewhere in the schematic in series with a given branch will only make sure the given branch is protected. For an AC-powered product, decisions about protecting the live conductor, both current-carrying conductors, or individual branches depend on the supply, wiring setup, grounding, and applicable safety requirements. Do not infer a universal mains-fusing rule from a simplified diagram. Importantly, mains and other hazardous-energy designs should be reviewed against the relevant standards by a qualified engineer. Fuse selection also requires more than just matching its printed ampere rating to normal load current. Check the maximum operating voltage, expected steady-state current, ambient temperature, startup or inrush pulses, time-current behavior, and the interrupting rating against the maximum prospective fault current in your circuit. A fuse that carries the load but cannot safely interrupt the available fault current should not be used. [Littelfuse’s selection guide](https://www.littelfuse.com/assetdocs/fuseology-selection-guide?assetguid=d812dff2-1c47-4dc3-bce7-07a4001ddc32) covers these factors and recommends testing against the actual application. Finally, a fuse does not replace thermal protection, surge suppression, correct wire and trace sizing, or safe enclosure design. It is one part of a protection strategy. ## Adding a Fuse to a Schematic in Flux In Flux, open the Parts Library and search for “fuse,” a fuse type, or a manufacturer part number. The [library documentation](https://docs.flux.ai/reference/reference-library) describes keyword and part-number search as well as filters for component information. Choose a component whose schematic symbol, available footprint, and data fit the intended design stage. Place the fuse near the power supply on the [schematic canvas](https://www.flux.ai/p/pcb-design-software/schematic-capture). Connect one terminal to the node with the power supply and the other to the node you want to protect. Then trace the net to confirm the loads you intend to protect are downstream of the fuse. Give it a readable designator such as `F1`. Document the selected part’s current and voltage ratings, response type, interrupting capability, and relevant package or holder. If the first revision of the schematic uses a generic fuse, mark its final selection as unresolved rather than letting an arbitrary placeholder enter the BOM. Before doing layout, check that the footprint and pad numbering match the manufacturer’s data. Review the finished protection circuit with the power source, wiring, fault paths, and any TVS diode, MOV, or thermal device visible. Flux’s [PCB design software](https://www.flux.ai/p/nb/pcb-design-software) can keep the schematic and board work in one project, but the engineering judgment about ratings and safety remains essential. ## FAQs ### What is the electrical symbol for a fuse? It is a small protective-component symbol inserted in a conductor. Its exact shape varies by standard and schematic library; look for its `F` designator and part details. ### What does F1 mean on a circuit board? `F1` is the reference designator for a particular fuse in the design. It identifies the component; it does not state its rating. ### Is a fuse symbol the same as a circuit breaker symbol? No. A breaker is a switching protection device that can generally be reset, while a conventional fuse opens once and must be replaced. ### What is the symbol for a thermal fuse? Libraries may use a dedicated temperature-marked symbol or a general fuse symbol with a clear thermal-cutoff label. Confirm the actual part from its specification. ### What is the difference between a fuse and a resettable fuse? A conventional fuse opens permanently after an appropriate fault. A PPTC moves to a high-resistance state and can recover after cooling; it does not behave identically to an open fuse. ### Where should a fuse be placed? Generally, place it in series near the entry to the conductor or branch being protected. The exact location and conductor choice depend on the power system and applicable safety requirements. ## About the author [Jharwin Barrozo](https://www.flux.ai/jharwinbarrozo) Electronics Engineer at Flux Jharwin is an electronics engineer mainly focused on satellites. He built his own ground station using Flux to monitor RF activities on the International Space Station. Find him on Flux [@jharwinbarrozo](https://flux.ai/jharwinbarrozo) Let’s start building Build your big idea together with Flux. All you need to do is describe what you want to make, or what problem you want to solve. Flux will work with you to make it a reality. ![Close-up photo of a PCB made with Flux, with an ESP32 module, buttons, and a microSD slot.](https://www.flux.ai/p/assets/blogs/miscellaneous/sidebar-cta-pcb.webp) [Try it Free](https://www.flux.ai/signup) ## More in PCB Design & Engineering Fundamentals [ ![What Is a PCB? 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systems](https://www.flux.ai/p/assets/blogs/buck-boost-converters/main.webp) ### Buck and Boost Converters: How They Work and Where They’re Used 3 Min Read](https://www.flux.ai/p/blog/explore-the-advantages-of-buck-and-boost-converter-in-modern-electronics)[ ![Typical schematic diagram of LM2596 buck converter or step-down converter with its various external components like capacitors, zener diode, and inductor](https://www.flux.ai/p/assets/blogs/lm2596/main.webp) ### LM2596 in Action: Case Study of Its Application in Power Supply Units 5 Min Read](https://www.flux.ai/p/blog/lm2596-in-action-case-study-of-its-application-in-power-supply-units)[ ![A complex printed circuit board highlighting the proper usage of ground fills/poor, stitching vias and power planes, without any components.](https://www.flux.ai/p/assets/blogs/gnd-fills-power-planes/main.webp) ### Guide to GND Fills and Power Planes 6 Min Read](https://www.flux.ai/p/blog/guide-to-gnd-fills-and-power-planes)[ ![Illustration for Power Distribution Network (PDN) Design in PCBs](https://www.flux.ai/p/assets/blogs/pdn-design-pcb/main.webp) ### Power Distribution Network (PDN) Design in PCBs 10 Min Read](https://www.flux.ai/p/blog/pdn-design-pcb)[ ![A detailed illustration of PCB grounding techniques showing ground planes, return paths, and noise reduction strategies](https://www.flux.ai/p/assets/blogs/pcb-grounding-techniques/main.webp) ### PCB Grounding Techniques for Noise Reduction and Stability 11 Min Read](https://www.flux.ai/p/blog/pcb-grounding-techniques)[ ![A detailed illustration of high-current PCB design showing trace sizing, thermal management, and power layout strategies](https://www.flux.ai/p/assets/blogs/high-current-pcb-design/main.webp) ### Designing High-Current PCBs: Layout and Safety Considerations 8 Min Read](https://www.flux.ai/p/blog/high-current-pcb-design)[ ![An illustration showing PCB trace resistance calculation concepts with copper traces and measurement tools](https://www.flux.ai/p/assets/blogs/how-to-calculate-pcb-trace-resistance/main.webp) ### How to Calculate PCB Trace Resistance 6 Min Read](https://www.flux.ai/p/blog/how-to-calculate-pcb-trace-resistance)[ ![A focused electrician wearing safety gear is carefully inspecting or repairing an electrical box with wires attached to it. He wears a yellow hard hat, safety glasses, ear protection, and gloves, highlighting the importance of personal protective equipment when working with electrical systems. The meticulous examination of the electrical connections signifies the critical nature of ensuring proper voltage levels and avoiding voltage drop, which can lead to reduced efficiency and potential damage to electrical components.](https://www.flux.ai/p/assets/blogs/voltage-drop/main.webp) ### Voltage Drop Calculations: Formulas, Factors, and Guidelines 5 Min Read](https://www.flux.ai/p/blog/importance-of-voltage-drop-calculations)[ ![An array of AC to DC converter circuit boards featuring components like transformers, bridge rectifiers, and capacitors to facilitate the conversion of alternating current to direct current.](https://www.flux.ai/p/assets/blogs/ac-to-dc-converters/main.webp) ### AC to DC Converter: The Backbone of Power Electronics 4 Min Read](https://www.flux.ai/p/blog/ac-to-dc-converter-the-backbone-of-power-electronics)[ ![AC-to-DC Converters: How They Work, Types, and Design Tips](https://www.flux.ai/p/assets/blogs/hatter/ac-dc-converter/main.webp) ### AC-to-DC Converters: How They Work, Types, and Design Tips 5 Min Read](https://www.flux.ai/p/blog/what-is-an-ac-to-dc-converter-technical-basics-explained)[ ![Illustration for Thermal Management in PCB Design: Methods and Best Practices](https://www.flux.ai/p/assets/blogs/pcb-thermal-management/main.webp) ### Thermal Management in PCB Design: Methods and Best Practices 10 Min Read](https://www.flux.ai/p/blog/pcb-thermal-management)[ ![PCB Thermal Management: Analysis and Design Best Practices](https://www.flux.ai/p/assets/blogs/pcb-thermal-analysis/main.webp) ### PCB Thermal Management: Analysis and Design Best Practices 6 Min Read](https://www.flux.ai/p/blog/achieving-efficient-heat-flow-pcb-thermal-management-best-practices)[ ![Illustration of a PPS chip symbolically powering three fast charging technologies—PPS, Power Delivery (PD), and Quick Charge (QC)—on a dark background.](https://www.flux.ai/p/assets/blogs/programmable-power-supply/main.webp) ### Understanding PPS Fast Charging: What It Is and How It Works 3 Min Read](https://www.flux.ai/p/blog/understanding-pps-fast-charging-what-it-is-and-how-it-works)[ ![Illustration for Decoupling Capacitors in PCB Design: Placement and Selection](https://www.flux.ai/p/assets/blogs/decoupling-capacitors-pcb/main.webp) ### Decoupling Capacitors in PCB Design: Placement and Selection 9 Min Read](https://www.flux.ai/p/blog/decoupling-capacitors-pcb)[ ![The image presents a graphical representation of Multilayer Ceramic Capacitors (MLCCs). On the left side of the image, there is a three-dimensional illustration of a capacitor, with a beige body and alternating white and golden layers, representing the ceramic and metal layers of the capacitor. An arrow points from this illustration to the right side of the image, where there is a cutaway view of a similar capacitor, showing multiple golden conducting layers separated by white ceramic layers, which illustrate the internal structure of the capacitor. The background is dark green, and above the illustrations, in large white and green text, the acronym "MLCCs" is spelled out, followed by the full term "MULTILAYER CERAMIC CAPACITORS" in smaller capital letters.](https://www.flux.ai/p/assets/blogs/multilayer-ceramic-capacitors/main.webp) ### What Is a Multilayer Ceramic Capacitor (MLCC)? 5 Min Read](https://www.flux.ai/p/blog/what-is-a-multilayer-ceramic-capacitor-key-features-and-applications)[ ![Cutaway diagram of a tantalum capacitor showing anode, dielectric, cathode layers, epoxy case, and leads](https://www.flux.ai/p/assets/blogs/tantalum-capacitor/main.webp) ### Tantalum Capacitors Guide: Polarity, Derating & Risks 7 Min Read](https://www.flux.ai/p/blog/tantalum-capacitor)[ ![A big text Amps vs Volts with their corresponding symbols (I and V) as background](https://www.flux.ai/p/assets/blogs/amps-vs-volts/main.webp) ### Amps vs. Volts: Key Differences and How They Work Together 4 Min Read](https://www.flux.ai/p/blog/amps-vs-volts-understanding-the-key-differences)[ ![Shunt resistor, Hall-effect, and current transformer current sensors compared.](https://www.flux.ai/p/assets/blogs/current-sensor-types/main.webp) ### Current Sensor Types: Shunt, Hall Effect, and Current Transformer Comparison 12 Min Read](https://www.flux.ai/p/blog/current-sensor-types)[ ![Never Worry About Stackups Again: Introducing the Stackup Editor](https://www.flux.ai/p/assets/blogs/stackup_editor/main.webp) ### Never Worry About Stackups Again: Introducing the Stackup Editor 3 Min Read](https://www.flux.ai/p/blog/never-worry-about-stackups-again-introducing-the-stackup-editor)[ ![Flux Stackup Editor showing a Standard 4-Layer PCB stackup with Top Copper, Mid-Layer 1, Mid-Layer 2, and Bottom Copper signal layers separated by Prepreg and Core dielectric materials, with layer thicknesses and dielectric constants configured for impedance-controlled PCB design.](https://www.flux.ai/p/assets/blogs/multilayer-pcb-design/main.webp) ### Multilayer PCB Design: Best Practices for Circuit Board Layout 8 Min Read](https://www.flux.ai/p/blog/multilayer-pcb-design-best-practices)[ ![An illustrated guide to PCB materials comparing FR4 and advanced substrates for high-performance circuit board design](https://www.flux.ai/p/assets/blogs/pcb-materials-guide/main.webp) ### How to Choose PCB Materials: FR4 vs Advanced Substrates 7 Min Read](https://www.flux.ai/p/blog/pcb-materials-guide)[ ![A detailed illustration showing the cross-section of a multilayer PCB with different via types including through-hole, blind, buried, and microvias](https://www.flux.ai/p/assets/blogs/pcb-via-types-guide/main.webp) ### Blind Vias, Buried Vias, and Microvias: A Complete Guide to PCB Via Types 12 Min Read](https://www.flux.ai/p/blog/pcb-via-types-guide)[ ![A 2d view and layout of a pcb board design showing different type of vias](https://www.flux.ai/p/assets/blogs/different-type-vias/main.webp) ### Exploring Different Types of Vias in PCB 2 Min Read](https://www.flux.ai/p/blog/exploring-different-types-of-pcb-vias)[ ![A complex PCB board with high-density interconnect (HDI) technology, featuring advanced routing on each of its copper layers.](https://www.flux.ai/p/assets/blogs/smart-micro-vias-blind-buried-vias/main.webp) ### High-Density PCBs just got easier with Smart Vias 4 Min Read](https://www.flux.ai/p/blog/high-density-pcbs-just-got-easier-with-smart-vias)[ ![A detailed illustration of a multilayer PCB cross-section showing via stitching connecting ground planes across layers](https://www.flux.ai/p/assets/blogs/via-stitching-pcb-guide/main.webp) ### How to Use Via Stitching in PCB Design 11 Min Read](https://www.flux.ai/p/blog/via-stitching-pcb-guide)[ ![An illustration of PCB design constraints showing electrical, mechanical, and manufacturing rules](https://www.flux.ai/p/assets/blogs/pcb-design-constraints/main.webp) ### PCB Design Constraints: What Engineers Need to Know 7 Min Read](https://www.flux.ai/p/blog/pcb-design-constraints)[ ![PCB constraint management showing how engineers control layout rules for routing, spacing, and impedance](https://www.flux.ai/p/assets/blogs/pcb-constraint-management/main.webp) ### PCB Constraint Management: How Engineers Control Layout Rules 6 Min Read](https://www.flux.ai/p/blog/pcb-constraint-management)[ ![Design Rule Checking (DRC) in PCB Design: Real-Time vs Batch, Rules, and Common Failures](https://www.flux.ai/p/assets/blogs/pcb-drc/main.webp) ### Design Rule Checking (DRC) in PCB Design: Real-Time vs Batch, Rules, and Common Failures 8 Min Read](https://www.flux.ai/p/blog/pcb-design-rule-checking-drc)[ ![ERC vs DRC in PCB design showing the difference between electrical rule checks and design rule checks](https://www.flux.ai/p/assets/blogs/erc-vs-drc/main.webp) ### Electrical Rule Check (ERC) vs DRC in PCB Design 7 Min Read](https://www.flux.ai/p/blog/erc-vs-drc)[ ![A guide to PCB design reviews covering schematic, layout, and DFM checks for catching errors early](https://www.flux.ai/p/assets/blogs/pcb-design-review-process/main.webp) ### PCB Design Reviews: Best Practices for Catching Errors Early 6 Min Read](https://www.flux.ai/p/blog/pcb-design-review-process)[ ![Common PCB Design Mistakes and How to Avoid Them](https://www.flux.ai/p/assets/blogs/pcb-design-mistakes/main.webp) ### Common PCB Design Mistakes and How to Avoid Them 31 Min Read](https://www.flux.ai/p/blog/pcb-design-mistakes)[ ![Image showing a stack of printed circuit boards (PCBs) with a large white 'X' over them, highlighting '5 Common Mistakes in PCB Design.' The background features intricate PCB traces in red and blue on a dark surface, with a purple gradient highlighting the title. The image emphasizes errors commonly made in PCB design, such as layout, signal integrity, and component placement.](https://www.flux.ai/p/assets/blogs/5-common-mistakes-in-pcb-design/main.webp) ### 5 Common PCB Design Mistakes and How to Avoid Them 7 Min Read](https://www.flux.ai/p/blog/5-pcb-design-mistakes-that-could-ruin-your-board)[ ![A guide to PCB silkscreen design covering labeling, readability, and common manufacturing mistakes](https://www.flux.ai/p/assets/blogs/pcb-silkscreen-design/main.webp) ### PCB Silkscreen Design: Guidelines and Common Mistakes 7 Min Read](https://www.flux.ai/p/blog/pcb-silkscreen-design)[ ![Advanced complex PCB boards using Flux's Smart Polygons](https://www.flux.ai/p/assets/blogs/smart-polygons/main.webp) ### Smart Polygons: Advanced PCB Design Just Got Easier 4 Min Read](https://www.flux.ai/p/blog/smart-polygons-advanced-pcb-design-just-got-easier)[ ![A complex printed circuit board with lots of electronic components. A 3D render of the PCB on Flux.](https://www.flux.ai/p/assets/blogs/new-3d-render/main.webp) ### Automatically Create Photorealistic PCB Renders 3 Min Read](https://www.flux.ai/p/blog/automatically-create-photorealistic-pcb-renders)[ ![A tool on Flux to measure the distance between two pads in PCB editor with a text mm to mil conversion.](https://www.flux.ai/p/assets/blogs/mm-to-mil/main.webp) ### How to Convert from MM to Mils: a Guide for Beginners 4 Min Read](https://www.flux.ai/p/blog/how-to-convert-from-mm-to-mils-a-guide-for-beginners)[ ![Illustration of a printed circuit board showing solder mask over copper traces and exposed pads.](https://www.flux.ai/p/assets/blogs/what-is-solder-mask/main.webp) ### What Is Solder Mask? Materials, Colors, and PCB Design Rules 6 Min Read](https://www.flux.ai/p/blog/what-is-solder-mask)[ ![Designing Custom PCB Outlines: Fixing DXF and SVG Import Failures](https://www.flux.ai/p/assets/blogs/import-dxf-board-outline-error/main.webp) ### Designing Custom PCB Outlines: Fixing DXF and SVG Import Failures 6 Min Read](https://www.flux.ai/p/blog/import-dxf-board-outline-error)[ ![PCB Enclosure Design: How to Design an Enclosure](https://www.flux.ai/p/assets/blogs/pcb-enclosure-design/main.webp) ### PCB Enclosure Design: How to Design an Enclosure 13 Min Read](https://www.flux.ai/p/blog/pcb-enclosure-design)[ ![A PCB layout with IPC design standards that apply to trace width, land patterns, and assembly.](https://www.flux.ai/p/assets/blogs/pcb-ipc-standards/main.webp) ### PCB IPC Standards Explained: IPC-2221, IPC-2152, IPC-7351, and More 9 Min Read](https://www.flux.ai/p/blog/pcb-ipc-standards)[ ![A guide to PCB component selection covering electrical specs, footprints, thermal performance, and sourcing best practices](https://www.flux.ai/p/assets/blogs/component-selection-pcb-design/main.webp) ### Component Selection in PCB Design: How Engineers Choose the Right Parts 7 Min Read](https://www.flux.ai/p/blog/component-selection-pcb-design)[ ![Flux Copilot’s new AI-powered part search makes finding and placing components faster and easier using natural language.](https://www.flux.ai/p/assets/blogs/smarter-part-search/main.webp) ### Smarter Part Search Just Got a Major Upgrade 6 Min Read](https://www.flux.ai/p/blog/smarter-part-search-just-got-a-major-upgrade)[ ![A detailed illustration showing PCB footprint design with pad layout, silkscreen markings, and courtyard boundaries](https://www.flux.ai/p/assets/blogs/pcb-footprint-design-guide/main.webp) ### How to Design a PCB Footprint (Step-by-Step Guide) 8 Min Read](https://www.flux.ai/p/blog/pcb-footprint-design-guide)[ ![A close-up xray of printed circuit board with its multi-layer traces featuring short circuit and over current protection.](https://www.flux.ai/p/assets/blogs/protection-circuit-101/main.webp) ### Protection Circuit 101: Securing Your Electronics from Overcurrent and Short Circuits 5 Min Read](https://www.flux.ai/p/blog/protection-circuit-101-securing-your-electronics-from-overcurrent-and-short-circuits)[ ![Diagram of a simple circuit with an inductor and a flyback diode. The resistor represents the resistance of the inductor's windings.](https://www.flux.ai/p/assets/blogs/flyback-diodes/main.webp) ### Understanding the Flyback Diode: Your Essential Guide to Functionality and Why You Need One 3 Min Read](https://www.flux.ai/p/blog/understanding-the-flyback-diode-your-essential-guide-to-functionality-and-why-you-need-one)[ ![3D render of a zener diode with its electronic symbol and pinout which consists of anode and cathode](https://www.flux.ai/p/assets/blogs/what-is-zener-diode/main.webp) ### What Is a Zener Diode? How It Works and Where It’s Used 5 Min Read](https://www.flux.ai/p/blog/what-is-a-zener-diode-an-essential-breakdown)[ ![A cross-section through an nMOSFET when the gate voltage VGS is below the threshold for making a conductive channel; there is little or no conduction between the terminals drain and source; the switch is off. When the gate is more positive, it attracts electrons, inducing an n-type conductive channel in the substrate below the oxide (yellow), which allows electrons to flow between the n-doped terminals; the switch is on.](https://www.flux.ai/p/assets/blogs/mosfet-basics/main.webp) ### Understanding the Fundamentals: MOSFET Basics for Beginners 6 Min Read](https://www.flux.ai/p/blog/understanding-the-fundamentals-mosfet-basics-for-beginners)[ ![Typical schematic diagram of LM741, a classic operational amplifier](https://www.flux.ai/p/assets/blogs/lm741/main.webp) ### LM741 Pinout: A Deep Dive into a Classic Op Amp 4 Min Read](https://www.flux.ai/p/blog/lm741-pinout-a-deep-dive-into-a-classic-op-amp)[ ![An assortment of variable resistors displayed on a dark background with the text 'Variable Resistors' at the top and a circuit symbol for a variable resistor in the center](https://www.flux.ai/p/assets/blogs/6-types-of-variable-resistors/main.webp) ### 6 Types of Variable Resistors: a Detailed Look at Their Uses 6 Min Read](https://www.flux.ai/p/blog/6-types-of-variable-resistors-a-detailed-look-at-their-uses)[ ### Parallel and Series Resistor Calculator 3 Min Read](https://www.flux.ai/p/blog/parallel-and-series-resistor-calculator)[ ![A resistor showing its different color bands](https://www.flux.ai/p/assets/site-cms/643f890cd71a69ee18b71efa_resistor-color-code-calculator.png) ### Resistor Color Code Calculator 4 Min Read](https://www.flux.ai/p/blog/resistor-color-code-calculator)[ ![A comparison illustration of SMT and through-hole PCB assembly technologies](https://www.flux.ai/p/assets/blogs/smt-vs-through-hole/main.webp) ### SMT vs Through-Hole Technology: Which Should You Use? 8 Min Read](https://www.flux.ai/p/blog/smt-vs-through-hole)[ ![A person soldering a circuit board made with Flux](https://www.flux.ai/p/assets/blogs/flux-soldering/main.webp) ### How to Use Flux When Soldering Electronics 13 Min Read](https://www.flux.ai/p/blog/solder-flux-guide-for-soldering)[ ![Different types of toggle switches scattered and a big text - Toggle switch](https://www.flux.ai/p/assets/blogs/toggle-switch/main.webp) ### The Ultimate Guide to Toggle Switches: Types, Uses, and How They Work 3 Min Read](https://www.flux.ai/p/blog/the-ultimate-guide-to-toggle-switches-types-uses-and-how-they-work)[ ![A push button switch soldered on a rigid-flex printed circuit board](https://www.flux.ai/p/assets/blogs/push-button/main.webp) ### What Is the Science Behind Push Button Switches and How They Work 6 Min Read](https://www.flux.ai/p/blog/what-is-the-science-behind-push-button-switches-and-how-they-work)[ ![Tactile Switches: Wiring, Debouncing, and PCB Design](https://www.flux.ai/p/assets/blogs/tactile-switches-guide/main.webp) ### Tactile Switches: Wiring, Debouncing, and PCB Design 8 Min Read](https://www.flux.ai/p/blog/tactile-switches-guide)[ ![Close up of different types of electrical connectors, wire connectors, and solder connectors piled up.](https://www.flux.ai/p/assets/blogs/electrical-connectors/main.webp) ### Electrical Wire Connector Types and Uses 4 Min Read](https://www.flux.ai/p/blog/the-ultimate-guide-to-electrical-connectors-and-wiring-connection)[ ![An illustration of PCB debugging tools and techniques including multimeter, oscilloscope, and thermal imaging](https://www.flux.ai/p/assets/blogs/pcb-debugging-common-issues/main.webp) ### Why Your PCB Is Failing: Debugging Common Issues 7 Min Read](https://www.flux.ai/p/blog/pcb-debugging-common-issues)[ ![555 Timer Guide: Pinout, Operating Modes, and Circuit Examples](https://www.flux.ai/p/assets/blogs/555-timer/main.webp) ### 555 Timer Guide: Pinout, Operating Modes, and Circuit Examples 10 Min Read](https://www.flux.ai/p/blog/555-timer)[ ![Inverting Op-Amp Circuits: Formula, Gain, and Design Examples](https://www.flux.ai/p/assets/blogs/inverting-op-amp/main.webp) ### Inverting Op-Amp Circuits: Formula, Gain, and Design Examples 10 Min Read](https://www.flux.ai/p/blog/inverting-op-amp)[ ![How to Wire a Potentiometer: Pinout, Diagrams, and PCB Examples](https://www.flux.ai/p/assets/blogs/how-to-wire-a-potentiometer/main.webp) ### How to Wire a Potentiometer: Pinout, Diagrams, and PCB Examples 8 Min Read](https://www.flux.ai/p/blog/how-to-wire-a-potentiometer) See All (113) ## Let’s start building. Let’s build your idea together. All you need to do is describe what you want to make, or what problem you want to solve. Flux will work with you to make it a reality. [Try it Free](https://www.flux.ai/signup) ![Close-up of a Flux-designed printed circuit board](https://www.flux.ai/p/assets/homepage-v2/mission-visual.webp)