12V 40A Automotive Relay with Socket – Reliable Switching for Your Vehicle’s Electrical Load
Need to wire up auxiliary headlights, a fuel pump, or a cooling fan without overloading your vehicle’s original wiring? A high-quality automotive relay is the difference between a secure, professional connection and a costly electrical short. This 40A 12VDC model comes ready to install, complete with a pre-wired socket for a hassle-free setup.
Note: This relay is designed exclusively for 12VDC automotive electrical systems. It is not compatible with 24V systems.
Why choose this model? (Key Advantages):
- 40A Switching Capacity — Easily handles high-draw components like fog lights, dual pumps, or radiator cooling fans.
- Ag Alloy Contacts — Superior resistance to electrical arcing compared to standard copper contacts, ensuring long-term reliability.
- 100,000 Electrical Cycles Guaranteed — Built to last; if switched 10 times a day, this relay will provide over 27 years of service.
- Fast Response Time (≤15ms) — Near-instantaneous switching with no noticeable lag in your circuit.
- Wide Operating Temperature (-55°C to +70°C) — Engineered to perform in everything from freezing winter conditions to the intense heat of an engine bay.
- Socket Included — Ready for immediate installation without the need for complex soldering or modifications to your existing wiring.
- 1.8W Coil — Low power consumption ensures compatibility with any standard 12V automotive electrical system.
Performance and Specifications
At the heart of this relay is a 1.8W coil, engineered for stable operation without generating excessive heat. The contact-to-coil insulation is rated at 1500VAC/1min, exceeding standard automotive requirements. With an insulation resistance of 100MΩ at 500VDC, you can be confident that current leakage is effectively eliminated, even in the high-humidity environment of an engine compartment.
| Parameter | Value / Detail |
|---|---|
| Rated Voltage | 12VDC |
| Switching Current | 40A |
| Number of Pins | 4 |
| Contact Material | Ag Alloy |
| Contact Resistance | ≤100MΩ |
| Coil Power | 1.8W |
| Operate Time | ≤15ms |
| Release Time | ≤10ms |
| Electrical Life | 100,000 cycles |
| Mechanical Life | 10,000,000 cycles |
| Contact-to-Contact Insulation | 1000VAC / 1min |
| Contact-to-Coil Insulation | 1500VAC / 1min |
| Insulation Resistance | 100MΩ at 500VDC |
| Operating Temperature | -55°C ~ +70°C |
| Operating Humidity | 35–80% |
| Socket Included | Yes |
Package Contents
- 1x 12V 4-Pin 40A Automotive Relay
- 1x Relay Socket
Frequently Asked Questions
Is the socket included in the package?
Yes. The relay plugs directly into the included socket, allowing for a quick, tool-free installation that takes minutes, not hours.
What can I connect to this relay?
You can use this for auxiliary headlights, fuel or water pumps, cooling fans, car alarms, or any 12VDC accessory that does not exceed a 40A draw.
Can it be used on 24V systems?
No. The coil is strictly rated for 12VDC. Using it on a 24V system will cause immediate damage and will void the warranty.
Does it work in freezing winter temperatures?
Yes, it is rated down to -55°C. Both the contacts and the coil remain fully functional in extreme cold, ensuring reliable startup every time.
What is the expected lifespan of the relay?
It is rated for 100,000 electrical cycles. If you use it 20 times a day, it will last over 13 years without needing replacement.
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