40A 4-Pin SPST Car Relay 12V 24V | Automotive Electrical Switch
40A 4-Pin SPST Car Relay 12V 24V | Automotive Electrical Switch
40A 4-Pin SPST Automotive Relay – 12V / 24V
Upgrade or replace your vehicle's electrical switching with this dependable 40A SPST 4-Pin Automotive Relay. Rated for both 12V and 24V systems, it handles high-amperage circuits with ease — making it an ideal solution for a wide range of car electrical projects, from strobe and fog light wiring to remote start systems and air horns.
Made in Mainland China.
Key Features
- Dual Voltage Compatible: Works with both 12V and 24V automotive electrical systems
- High Current Rating: Handles up to 40 amps — perfect for power-hungry accessories
- SPST Contact Type: Single Pole Single Throw design for clean, reliable on/off switching
- 4-Pin Configuration: Standard layout for straightforward installation and wiring
- Durable Construction: Built with plastic housing and metal contacts for long-lasting performance
- Versatile Applications: Suitable for car alarms, remote starts, HID headlights, strobe lights, fog lights, door/trunk releases, stereos, fans, air horns, and more
- Includes Cable: Comes with a relay cable for immediate use
Specifications
| Material | Plastic + Metal |
| Color | Black |
| Operating Voltage | 12V / 24V |
| Current Rating | 40A |
| Contact Type | SPST (Single Pole Single Throw) |
| Pin Count | 4 Pin |
What's in the Box
- 1 × Automotive Relay (Black)
- 1 × Cable
Notes
- Photos are for illustration purposes — please refer to the specifications above for exact dimensions.
- Slight variations in measurements may occur due to manual measurement.
- Colors may vary slightly between different monitor displays.
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Frequently Asked Questions
Q: Is this automotive relay compatible with both 12V and 24V vehicles?
A: Yes, this 4-pin SPST relay is rated for use in both 12V and 24V automotive electrical systems, making it suitable for cars, trucks, SUVs, and larger commercial vehicles.
Q: What types of accessories can this 40A relay be used for?
A: This relay is ideal for high-amperage accessories such as strobe lights, fog lights, HID headlights, car alarms, remote start systems, air horns, stereos, cooling fans, and door or trunk release mechanisms.
Q: What does SPST mean for an automotive relay?
A: SPST stands for Single Pole Single Throw — this means the relay controls a single circuit and provides a simple on/off switching function, making installation and wiring straightforward for most automotive electrical projects.