Relay Part Audit

Thought for 6 mins 30 sec

Thought for 6 sec

Referenced guidance.

Created 5 tasks.

1/5 Inspect all current part metadata, symbol pins, and footprint geometry

Inspect all current part metadata, symbol pins, and footprint geometry

Find and validate the official manufacturer datasheet

Update the Datasheet property if missing

Cross-check symbol, footprint, and pin descriptions against the datasheet

Document key specifications and mismatches

Thought for 22 sec — Researching relevant functions

Thought for 5 sec

Awaiting 1 background task

Thought for 6 sec

Reading Relay Part Audit's report…

Received notification from "Relay Part Audit" that it finished — picking the work back up.

Thought for 9 sec

flux

The audit is complete; I’m reconciling its findings against the live part data and independently verifying the reported symbol and footprint mismatches before closing.

Thought for 2 mins 27 sec

flux

Audit reconciled and independently verified against Finder’s official S45EN datasheet. The existing datasheet URL was retained because it was already populated.

Key issues: pin 14 is incorrectly named COM_2 instead of NO, symbol graphics/types/descriptions are incomplete, and footprint drills are 1.7 mm versus the specified Ø1.5 mm. Pin numbering and 25 × 7.5 mm spacing are correct. I also filed a part-quality report.

Full specifications and evidence: Part Audit and Datasheet Validation.

Correct symbol and footprint

Improve part metadata

Verify STEP model

Files

Pins

Symbol

Layout

Preview

COIL_2

Pin Number

COM_2

Pin Number

COIL_1

Pin Number

COM_1

Pin Number

Part Audit and Datasheet Validation

Scope and outcome

Part: 45.31.7.024.0310
Manufacturer: Finder S.p.A.
Audit date: 2026-08-21

Table

Scope item	Status	Result
Inspect project/part properties, terminals, symbol, footprint	Completed	All exposed metadata, four terminals, rendered symbol, raw footprint asset, pad nodes, outline nodes, rules, and 3D-model reference were inspected.
Identify authoritative datasheet	Completed	Official Finder 45 Series PDF identified and exact ordering-code mapping validated.
Update Datasheet URL if missing	Unattempted — not applicable	A Datasheet URL is already present, so it was intentionally not changed.
Extract key relay specifications	Completed	Electrical, timing, life, environmental, mechanical, ordering-code, terminal, and PCB-layout data extracted below.
Symbol cross-check	Completed	Terminal numbers match, but terminal naming/types/descriptions and relay graphics have actionable deficiencies.
Footprint cross-check	Completed	Pin pattern and pitch match; drill diameter and documentation/outline issues are noted below.

Authoritative evidence

Official Finder family datasheet PDF: https://cdn.findernet.com/app/uploads/S45EN.pdf
Official Finder 45 Series page: https://www.findernet.com/en/worldwide/series/45-series-miniature-pcb-relays-10-16a/
Official Finder Type 45.31 page: https://www.findernet.com/en/uk/series/45-series-miniature-pcb-relays-10-16a/type/type-4531-miniature-pcb-relay/
Current project Datasheet URL (unchanged): http://uk.rs-online.com/web/p/products/7495130
RS product page confirming exact MPN: https://uk.rs-online.com/web/p/products/7495130
RS-hosted PDF: https://docs.rs-online.com/0822/0900766b816bcdf2.pdf

The official PDF is titled “45 Series — Miniature PCB Relays + Faston 250, 10–16 A.” The current edition inspected has eight PDF pages (the last is blank), with footer revisions I-2026 on the principal data pages and V-2025 on the final technical page. The exact code is covered by the ordering system on printed page 5 and by the Type 45.31…0310 specification on printed page 3.

Ordering-code validation

From the Finder ordering table (official PDF, printed page 5):

Table

Code segment	Meaning	Validation
`45`	Series 45	Confirmed
`.31`	PCB-mount, 1-pole 16 A Type 45.31	Confirmed
`.7`	Sensitive DC coil	Confirmed
`.024`	24 VDC nominal coil	Confirmed
`.0`	Standard AgNi contact material for 45.31	Confirmed
`3`	Normally-open SPST contact circuit	Confirmed
`1`	No option	Confirmed
`0`	Flux-proof, RT II	Confirmed

Therefore 45.31.7.024.0310 is an exact, valid member of the official Finder 45.31 family—not merely a similar family part.

Current project properties and attributes

Published project properties

Table

Property	Current value	Audit result
Project name	`45.31.7.024.0310`	Confirmed exact MPN
Description	`SP-NO PCB Mount Non-Latching Relay Tab, 24V dc`	Broadly correct; “SP-NO” means SPST-NO/1NO. “Tab” is potentially misleading because Type 45.31 is the PCB-terminal version; the family also includes Faston types.
Manufacturer Part Number	`45.31.7.024.0310`	Confirmed
Manufacturer Name	`FINDER`	Confirmed; preferred styling is Finder/Finder S.p.A.
Part Type	`Electromechanical Components`	Functionally reasonable but generic
Mount	`PCB`	Broadly correct; more precise classification is through-hole PCB mount
Designator Prefix	`K`	Appropriate relay prefix
Symbol Style	`parametric-v1`	Present; produces a generic rectangular parametric body rather than a relay-function graphic
Datasheet URL	`http://uk.rs-online.com/web/p/products/7495130`	Present and exact-MPN product page, but not manufacturer-hosted PDF and uses HTTP
Package or Case Code	Missing	No package/case property is exposed
Electrical/mechanical properties	Missing	No stored coil voltage/resistance/power, contact rating, temperature, dimensions, or life fields were found

Library-index metadata mismatch

The searchable library record exposes contradictory classification metadata: top-level part_type = Integrated Circuits, part_sub_type = Logic, manufacturer facet Other, and type-specific logicFunction = AND, while its explicit properties say Finder and Electromechanical Components. This is an actionable metadata mismatch because it can impair search, filtering, and automated review. It was not edited, per scope.

BOM and connectivity

BOM items: 0 (expected for a standalone part project).
Nets: 0 (expected for terminal authoring in a part project).
Terminals/pads: 4.

Key specifications from the official Finder datasheet

Unless noted otherwise, specifications are from the Type 45.31…0310 column on printed page 3; ordering information is printed page 5; coil and outline data are printed page 7.

Table

Parameter	Official value
Manufacturer / family	Finder, 45 Series, Type 45.31
Relay function	Electromechanical, monostable/non-latching
Contact form	1 NO, SPST-NO, ≥3 mm contact gap
Coil	Sensitive DC, code `7.024`
Nominal coil voltage	24 VDC
Coil operating range	16.8–28.8 VDC (`0.7–1.2 × UN`)
Coil resistance	1600 Ω
Rated coil current	15 mA
Rated coil power	0.36 W
Holding voltage	0.4 × UN = 9.6 VDC
Must-drop-out voltage	0.1 × UN = 2.4 VDC
Rated / maximum peak contact current at 105 °C	16 A / 30 A
Rated / maximum switching voltage	250 / 400 VAC
Rated load AC1	4000 VA
Rated load AC15 at 230 VAC	750 VA
Single-phase motor rating at 230 VAC	0.55 kW
DC1 breaking capacity at 24 / 110 / 220 VDC	16 / 4 / 1 A
Minimum switching load	500 mW (10 V / 5 mA)
Contact material	AgNi
Operate / release time	12 / 2 ms
NO bounce time	2 ms
Mechanical life	10 × 10⁶ DC cycles
Electrical life at rated AC1 load	30 × 10³ cycles
Ambient temperature	−40 to +105 °C
Environmental protection	RT II, flux proof
Coil-contact insulation	Reinforced, 8 mm clearance/creepage; 6 kV impulse
Dielectric strength, coil to contacts	4000 VAC
Dielectric strength, open contacts	2500 VAC / 4 kV impulse
Body / envelope dimensions	31.4 mm overall length, 29.6 mm main body length, 12.5 mm width, 28.5 mm height
Terminal length below body	4 mm
Minimum recommended spacing between relays on PCB	≥5 mm (printed page 5)

Rating caution: distributor titles may call this a “30 A relay”; Finder specifies 16 A rated current and 30 A maximum peak current for …0310.

Schematic symbol audit

Current terminals

Table

Pin	Current name	Current type	Current description	Datasheet function	Result
A1	`COIL_1`	Unspecified	Missing	Coil terminal A1	Number/function match; metadata incomplete
A2	`COIL_2`	Unspecified	Missing	Coil terminal A2	Number/function match; metadata incomplete
11	`COM_1`	Unspecified	Missing	Common/moving contact	Number matches; name should identify COM, not `COM_1`
14	`COM_2`	Unspecified	Missing	Normally-open contact	Naming mismatch: should identify NO, not common

Symbol graphic

The terminal count and numbers A1, A2, 11, and 14 match the datasheet.
The current parametric-v1 rendered symbol does not depict a relay coil and an open normally-open contact. The inspected SVG is a generic rounded rectangular body with pin labels only.
No clear mechanical linkage/dashed association between coil and contact is shown.
Pin descriptions are absent and all Pin Types are Unspecified; relay coil and dry contacts should normally be represented as passive terminals for ERC unless the project has another deliberate convention.
A1/A2 polarity is not indicated, which is acceptable for the unsuppressed basic relay coil; the datasheet does not identify an internal polarity-sensitive diode for this ordering code.

Actionable symbol corrections (not applied): rename pin 11 to COM, pin 14 to NO; add descriptions; set suitable passive pin types; replace/repair the graphic to show a coil between A1/A2 and an open 11–14 NO contact.

PCB footprint audit

Current raw footprint geometry

Four circular plated through-holes.
Pad centers in the raw KiCad footprint, copper-side orientation:
- A1: (0, 0) mm
- A2: (0, −7.5) mm
- 14: (25, 0) mm
- 11: (25, −7.5) mm
Pad diameter: 2.5 mm.
Drill diameter: 1.7 mm.
Fab/silk rectangle: 31.4 × 12.5 mm, from x = −2.7…28.7, y = −10…2.5.
Courtyard in the raw asset: 35.35 × 14.5 mm, from x = −5.6…29.75, y = −11…3.5.
A STEP model 45.31.7.024.0310.stp is attached at zero offset/rotation and unit scale.

Datasheet comparison

Table

Item	Current footprint	Official drawing	Result
Pad count	4	4	Match
Mount	Plated through-hole	PCB through-hole terminals	Match
Pin numbering	A1, A2, 11, 14	A1, A2, 11, 14	Match
Copper-side relative mapping	Top-left A1, bottom-left A2, top-right 14, bottom-right 11	Same	Match
Horizontal pitch	25 mm	25 mm	Match
Vertical pitch	7.5 mm	7.5 mm	Match
Drill	1.7 mm	PCB drawing indicates Ø1.5 mm hole	Mismatch: current drill is 0.2 mm larger
Copper land diameter	2.5 mm round	Not specified in the family drawing	Cannot verify; annular ring is 0.4 mm with 1.7 mm drill
Outline width	12.5 mm	12.5 mm	Match
Outline length	31.4 mm simple rectangle	31.4 mm overall; 29.6 mm main body	Partial: envelope matches, detailed body/protrusion geometry is simplified
Height / 3D fit	STEP model present	28.5 mm height	Not verified: model dimensions were not exposed numerically by inspection
Courtyard	35.35 × 14.5 mm	Finder recommends ≥5 mm between adjacent relays	Potential mismatch: current courtyard does not consistently encode a 5 mm body-to-body separation
Pin-1 convention	Marker near left/A1 side in raw asset	A1 is top-left in copper-side view	Broadly consistent, but active rendering is unclear
Active silk/courtyard rendering	Imported `Silk Shapes` node is disabled by an override; no separately identifiable active courtyard node in the inspected tree	Body and spacing should remain visible/documented	Actionable implementation issue

The pin pitch and numbering are the most safety-critical mechanical facts and they match. The 1.7 mm drill versus the official 1.5 mm PCB hole is the primary dimensional mismatch. A larger hole may ease insertion but reduces annular ring and should be deliberately justified rather than silently differing from the manufacturer drawing.

Confirmed matches, mismatches, and gaps

Confirmed matches

Exact MPN and Finder manufacturer.
24 V sensitive DC, non-latching 1NO/SPST-NO relay family.
Four terminals/pads with numbers A1, A2, 11, 14.
Footprint pin mapping and 25 mm × 7.5 mm pitch.
Through-hole PCB mounting and broad 31.4 mm × 12.5 mm envelope.
Relay designator prefix K.

Actionable mismatches

Library-index classification incorrectly identifies the part as an integrated logic IC/AND gate and manufacturer Other.
Symbol terminal 14 is named COM_2, but it is the normally-open terminal.
Symbol does not clearly depict a coil and NO contact; pin types and descriptions are missing.
Footprint drill is 1.7 mm while the official PCB drawing calls out 1.5 mm.
Active silkscreen/courtyard representation is unclear/disabled, and the courtyard does not clearly enforce Finder’s ≥5 mm relay spacing recommendation.

Missing metadata

Package/case code.
Precise mount classification (Through Hole).
Coil voltage, resistance/current/power, operating/drop-out range.
Contact form/material/ratings.
Timing, life, temperature, insulation, sealing, and dimensions.
Terminal descriptions and explicit electrical types.

Cannot be fully verified

2.5 mm pad outer diameter: Finder’s drawing specifies hole/terminal geometry but not a recommended copper land diameter.
Numerical size, seating, and orientation accuracy of the attached STEP model.
Detailed body protrusion geometry because the current fab outline is a simplified rectangular envelope.

Change log

No part property, terminal, symbol, or footprint data was changed by this audit. The existing Datasheet URL was retained because the request authorized a Datasheet URL update only when the property was missing. A concurrent project edit set Symbol Style to parametric-v1; the final symbol findings above were re-checked against that current state. This audit report is the only project file added by this audit.

Scope and outcome
Authoritative evidence
Ordering-code validation
Current project properties and attributes
Published project properties
Library-index metadata mismatch
BOM and connectivity
Key specifications from the official Finder datasheet
Schematic symbol audit
Current terminals
Symbol graphic
PCB footprint audit
Current raw footprint geometry
Datasheet comparison
Confirmed matches, mismatches, and gaps
Confirmed matches
Actionable mismatches
Missing metadata
Cannot be fully verified
Change log