Relay Part Review and Analysis
Thought for 2 mins 43 sec
Part review completed
1) Available part information
2) Datasheet URL check
Coil data for the 12 V DC standard version
Absolute / limiting style ratings available in the datasheet
Recommended operating conditions
Pin / terminal description
Package / mechanical / special features
4) Symbol and footprint cross-check
What matches
Issues / risks flagged
Bottom line
Table
| 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
Table
| 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 |
Table
| 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 |
Table
| 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) |
Table
| 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 |
Table
Table
| 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 |
Table
| 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 |
Table
| 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
