Car care
10-Pack 4-Pin 12V 40A Automotive Relays (4-Pin SPST)
Product description
This bundle contains ten identical 4-pin single-pole single-throw (SPST) automotive relays, each intended for 12 volt systems with a 40 amp contact rating. The kit is meant to replace or mirror JD1912/JD2912-style relays and fits standard 4-prong sockets.
Each relay is housed in a molded plastic enclosure with four blade terminals arranged in the familiar 4-pin layout. The internal design uses a solenoid actuator and a set of sealed contacts sized to handle high-current switching duties up to 40 A.
Installation is straightforward: use a compatible relay harness or attach female spade crimp connectors to the terminals for a secure connection. The relays accept common automotive wiring and can be used for lighting, fans, horns, pumps and other accessory circuits.
Specs at a glance: 10 pieces per pack; 4-pin SPST configuration; 12 V coil system; 40 A contact rating; plastic molded housing; standard blade terminals. No special tools are required for basic spade-terminal hookups, though harnesses speed multiple installations.
Pros
- 40A contact rating for high-current loads
- Solid molded housing and positive actuation
- Works with standard 4-pin sockets and spade connectors
Cons
- SPST only — no changeover contacts
- No mounting brackets or additional hardware included
- Basic packaging without individual protective cases
VerdictThese relays provide sturdy, straightforward switching for automotive accessories. They arrive in a 10-piece kit, accept standard spade terminals or a plug harness, and are suitable for lights, fans, horns and similar loads up to 40 amps. Build quality and actuation feel indicate durable contacts, and user bench testing shows low coil current draw. If you need simple, reliable SPST relays for mult
Reviews
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Brent Dennard 5/5
Bench-tested, solid-feeling units
I tested each relay on my bench; every one switched correctly and drew about 0.17 A (roughly 2 W) at 13.5 V. The plastic case appears more substantial than many tab-mount relays I've used. The solenoid snaps crisply with an audible click, which suggests heavier contacts and likely longer service life. Overall they feel dependable.
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Keri E. 5/5
Reliable for lighting circuits
Used these for auxiliary lights. Spade connectors fit cleanly and the relays operate as intended. I checked all units and each one functioned—simple, dependable relays for basic automotive lighting.
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