Relay Part Review and Analysis
2:43
Project
BOM
File
PCB Layout
Review (ERC/DRC)
Schematic
Considering.
Using Schematic Tool.
Using PCB Layout Tool.
Using BOM Tool.
Looking for "part identification, ordering code, general description, contact form, coil voltage, package or mounting style, terminal count" in S40EN.pdf
Looking for "electrical characteristics coil data contact ratings insulation dielectric strength operate release time mechanical life electrical life" in S40EN.pdf
Looking for "absolute maximum ratings limiting values contact load switching ratings ambient temperature storage temperature" in S40EN.pdf
Looking for "recommended operating conditions nominal coil voltage ambient operating temperature mounting or socket requirements" in S40EN.pdf
Looking for "pin configuration terminal identification coil terminals common normally open normally closed pin count" in S40EN.pdf
Looking for "package dimensions outline dimensions terminal layout PCB footprint socket dimensions special features approvals" in S40EN.pdf
Using PCB Layout Tool.
Using Review (ERC/DRC) Tool.
Part review completed
2) Datasheet URL check
4) Symbol and footprint cross-check
Bottom line
1) Available part information
| Field | Result |
|---|---|
| Description | General purpose relay, SPDT / 1 Form C, 12 VDC coil, socketable |
| MPN | 40.31.9.012.0000 |
| Manufacturer | FINDER |
| Mount | Socket |
| Project part type property | Electromechanical Components |
| Designator prefix property | K |
| Datasheet | |
| Schematic terminals present | COIL_1, COIL_2, COM, NC, NO |
| Pin count represented | 5 terminals |
| Terminal numbering in symbol | A1, A2, 11, 12, 14 |
| Footprint presence check | Present, no missing-footprint review error |
A datasheet URL was already set, so no web lookup or property update was needed.
3) Datasheet metadata summary
Key electrical characteristics
| Category | Datasheet data |
|---|---|
| Contact form | 1 CO (SPDT) |
| Rated current / max peak current | 12 A / 20 A for 40.31 |
| Rated voltage / max switching voltage | 250 / 400 V AC |
| Rated load AC1 | 3000 VA |
| Rated load AC15 at 230 V AC | 1000 VA |
| Single-phase motor rating at 230 V AC | 0.55 kW |
| Breaking capacity DC1 | 24 V: 12 A, 110 V: 0.6 A, 220 V: 0.25 A |
| Minimum switching load | 300 mW (5 V / 5 mA) |
| Standard contact material | AgNi |
| Mechanical life | 10 x 10^6 cycles |
| Electrical life at rated AC1 load | 200 x 10^3 cycles |
| Operate / release time | 7 / 3 ms |
| Bounce time NO / NC | 2 / 5 ms |
Coil data for the 12 V DC standard version
| Parameter | Datasheet data |
|---|---|
| Coil code | 9.012 |
| Nominal coil voltage | 12 V DC |
| Operating range | 8.8 V to 18 V |
| Coil resistance | 220 ohms |
| Coil current | 55 mA |
| Rated coil power | 0.65 W |
| Holding voltage | 0.4 UN |
| Must drop-out voltage | 0.1 UN |
Absolute / limiting style ratings available in the datasheet
| Parameter | Datasheet data |
|---|---|
| Maximum switching voltage | 400 V AC |
| Maximum peak current | 20 A |
| Ambient temperature range | -40 to +85 C |
| Special high-temperature option | +125 C wash-tight version only |
| Coil-contact dielectric strength | 4000 V AC |
| Coil-contact impulse withstand | 6 kV (1.2/50 us) |
Recommended operating conditions
| Parameter | Datasheet data |
|---|---|
| DC operating range | 0.73 to 1.5 UN |
| AC operating range | 0.8 to 1.1 UN |
| Relay ambient temperature | -40 to +85 C |
| Socket ambient temperature | -40 to +70 C |
| Mounting | Direct PCB or socket mount |
| Pin length options | 3.5 mm PCB only, 5.2 mm PCB or socket |
| Recommended relay-to-relay PCB spacing | >= 5 mm |
Pin / terminal description
Package / mechanical / special features
| Category | Datasheet data |
|---|---|
| Relay family | 40 Series power relays |
| Type for this project | 40.31 = 1 CO, 12 A, 3.5 mm pin pitch |
| Mounting support | PCB or socket family support, depending on pin length option |
| Insulation | Reinforced insulation between coil and contacts, 8 mm |
| Protection class options | RT II standard, RT III wash-tight option |
| Other features | EN 60335-1 glow-wire compliance, optional EMC suppression/accessory modules, bistable variants exist in family |
What matches
| Check | Result |
|---|---|
| Pin count | Pass - schematic shows 5 terminals, matching 1 CO relay |
| Pin designations | Pass - A1, A2, 11, 12, 14 match datasheet terminal identification |
| Contact form | Pass - symbol represents SPDT / 1 CO correctly |
| Missing footprint review | Pass - no missing-footprint error reported |
Issues / risks flagged
| Severity | Finding | Why it matters |
|---|---|---|
| High | The project properties say Mount: Socket, but the selected relay ordering code is 40.31, which the datasheet identifies as a relay type. The datasheet separately lists compatible 95 series sockets. | This can cause incorrect part ordering if the project is intended to represent the relay itself but is labeled as socket-mounted rather than identifying the actual socket as a separate part. |
| High | The project description says socketable, but the project contains only the relay terminal representation, not a separately identified socket part. | Manufacturing/BOM risk: a user may order only the relay and miss the required socket, or confuse the relay footprint with a socket footprint. |
| Medium | I could verify terminal identities, but I could not fully verify pad geometry, pitch, hole diameters, or body outline from the available layout output. | There may still be a manufacturing-fit risk if the footprint dimensions do not exactly match the datasheet's copper-side view for 40.31 / 3.5 mm pin pitch. |
| Medium | The project-level part type is Electromechanical Components, while the schematic instances are generic terminal objects. | Library metadata is usable, but symbol semantics are weak; this can reduce confidence in automated checks and part reuse quality. |
- The electrical symbol mapping looks correct for a 5-pin SPDT relay.
- The main concern is part identity versus socket identity:
- If this project is the relay, the properties should clearly describe the relay package/pin style and not imply the socket is the same part.
- If this project is intended to be the socketed assembly, the socket should be represented explicitly in metadata, and ideally as its own part.
- Clarify whether this project is:
- the relay only, or
- the socket for the relay, or
- a combined convenience part.
Right now, that ambiguity is the biggest risk for wrong ordering and possible footprint mismatch during manufacturing.
@review check DRC/ERC
Inspect footprint geometry
Check relay metadata
21 days
Ready.
Reviews
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General Purpose Relay SPDT (1 Form C) 12VDC Coil Socketable #CommonPartsLibrary #Relay #Power-relay #40.31.9
Pricing & Availability
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Assets
kicad_mod
40.31.9.012.0000
403190120000.kicad_modFootprint40.31.9.012.0000
40.31.9.012.0000.stp3D Model
40.31.9.012.0000
40.31.9.012.0000 Symbol.svgDefaultControls
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