Description
Bosch-Style SPDT Relay — 12V / 40A, with Bracket
A universal Bosch-style relay that acts as a remote-controlled switch, turning higher-current 12-volt circuits on, off, or over. Single-pole double-throw (SPDT) with a mounting bracket included.
Universal replacement relay — confirm your terminal layout and switching type against the relay you’re replacing before ordering.
A remote-controlled switch for high-current circuits
A relay lets a small control signal switch a much larger load. It’s an essential building block of a vehicle’s electrical system — driving cooling fans, blower motors, pumps, compressor clutches and lighting without running heavy current through the dash switch or control module.
This Bosch-style unit is a single-pole double-throw (SPDT) relay: energizing the coil moves a common contact between two outputs, so it can switch a circuit on and off or route power between two circuits. It’s rated for a 12V, 40A inductive load and includes a mounting bracket. Mount the relay with the terminals facing down to help prevent water ingress and support long, reliable operation.
Terminals & switching
A small trigger current through the coil (85 & 86) switches the high-current contacts: the common terminal (30) moves between the normally-closed output (87a) and the normally-open output (87), sending battery power to your load.
Terminals 85 and 86 are the coil. On a standard relay without an internal diode, either coil terminal can take the +12V trigger or ground; if your relay has a coil diode, follow its marked polarity. Always confirm the terminal layout against the relay you’re replacing before wiring.
Know exactly what you’re ordering
The details that decide whether this relay matches your circuit:
One relay, many circuits
Remote-controlled switching
Uses a small control signal to switch a much larger 12V load on, off, or over — the standard way to drive fans, blowers, pumps, compressor clutches and lighting.
40A capacity
Rated for a 12V, 40A inductive load, so it handles the higher-current accessory circuits found throughout modern vehicles.
Single-pole double-throw
A changeover (SPDT) contact set lets one relay switch a circuit on or route power between two circuits.
Bracket included
Ships with a mounting bracket for a secure, serviceable install.
Wide interchange
Cross-references Bosch, UAC, AC Delco, GM and other common relay numbers — see the table below.
Bosch-style footprint
Built to the familiar Bosch-style form factor used across automotive and equipment wiring.
Listed vehicle applications
This is a universal relay. The specific applications mapped in our catalog are:
| Year | Make & model | Engine |
|---|---|---|
| 1986 | Oldsmobile Cutlass Ciera (ES) | 3.8L V6 |
| 1986 | Oldsmobile Cutlass Ciera (Holiday) | 3.8L V6 |
| 1987 | Oldsmobile Cutlass Cruiser | — |
Universal part — not limited to the vehicles listed above. Confirm terminal layout and switching type against the relay you’re replacing.
Interchange & cross-reference numbers
This relay cross-references the following OEM and aftermarket numbers. Listed for identification only.
| Brand | Part number(s) |
|---|---|
| Bosch | V23234A1001X036 |
| UAC | RE 4121C |
| AC Delco | 158230 |
| Four Seasons | 35743 · 35782 · 36134 |
| General Motors | 25526984 |
| Global Parts Distributors | 1711246 · 1711312 |
| Omega | 3013307 · MT0504 · MT0507 |
| Santech | MT0507 |
Technical specs
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FAQ
What does an automotive relay do?
What is a single-pole double-throw (SPDT) relay?
How do I wire this 5-pin relay?
What’s the difference between terminal 87 and 87a?
Is this relay universal — will it fit my vehicle?
How should I mount it?
Match your relay before you buy
Terminal layout and switching type have to match. Send us your old relay’s numbers or call and we’ll confirm the right fit.
Add to cart ↑ Confirm my fitmentAll manufacturer names and part numbers are trademarks of their respective owners and are listed for identification and cross-reference purposes only; their use does not imply affiliation or endorsement. This is an aftermarket universal replacement relay. Confirm terminal layout, switching type, and circuit suitability against your application before ordering.
