12V 100A Automotive Relay – Effortlessly handle loads up to 1200W
Running a radiator fan, power steering pump, or a high-output amplifier that draws serious current? You need a relay that won’t let you down when it matters most. This unit handles a continuous 100A load, installs in minutes, and ensures zero parasitic draw when inactive.
Why choose this model? (Key Benefits):
- 100A / 1200W capacity without overheating — Built for real-world performance, not just lab conditions; maintains stability even near maximum current.
- Normally Open (NO) contact — The circuit remains open at rest, ensuring zero power drain when your equipment is switched off.
- Dual terminals for quick installation — Features stud terminals for heavy-duty power cables (min. 10mm²) and standard 6mm spade connectors for control pins.
- Universal 12V compatibility — Perfect for cars, light trucks, boats, and ATVs; integrates seamlessly into your existing electrical system.
- Compact yet rugged — Measuring 4.3 × 4.5 × 8 cm and weighing approx. 92g, the housing is built to withstand the vibrations, moisture, and temperature fluctuations typical of automotive environments.
- Versatile applications — Ideal for hydraulic pumps, radiator fans, high-power audio systems, inverters, and auxiliary lighting.
Performance and Specifications
The control coil activates at 12V DC, instantly closing the power contact to supply your load. The power terminals feature robust studs designed to accommodate high-gauge cabling — essential when drawing up to 100A. The control pins use standard 6mm spade connectors, making it fully compatible with automotive wiring harnesses without the need for adapters or modifications.
| Parameter | Value / Detail |
|---|---|
| Nominal Voltage | 12V DC |
| Nominal Current | 100A |
| Maximum Power | 1200W |
| Contact Type | Normally Open (NO) |
| Number of Pins | 4 |
| Power Terminals | Stud/Screw type |
| Control Terminals | 6mm spade connector |
| Dimensions | 4.3 × 4.5 × 8 cm |
| Weight | approx. 92g |
Installation and Usage Guide
- Identify the 2 small pins (control) and the 2 large pins (power).
- Connect the control pins to 12V DC and the vehicle chassis (GND) via a switch or control signal.
- Connect the power pins in series with your load (pump, fan, amplifier, etc.) and the main power source.
- Use a minimum cable cross-section of 10mm² on the power circuit when approaching 100A.
- Ensure the voltage and current of your equipment do not exceed 12V / 100A / 1200W.
- Secure the relay mechanically to minimise the impact of vibrations on your connections.
Package Contents
- 1 × 12V 100A Automotive Relay (4-pin, NO)
Frequently Asked Questions
Is this compatible with my vehicle’s electrical system?
Yes. This relay is designed for 12V DC, the standard voltage for cars, light trucks, boats, and ATVs. It integrates directly without requiring system modifications.
Can I use this for a high-power car amplifier?
Yes. It supports up to 100A / 1200W, which is more than sufficient for high-power amplifiers and subwoofers, provided you stay within the rated specifications.
What cable size should I use for the power terminals?
For currents approaching 100A, use a cable with a cross-section of at least 10mm². For lower currents, the gauge can be reduced accordingly, following standard automotive electrical installation practices.
What does ‘Normally Open’ mean?
It means that at rest — with no voltage applied to the coil — the load circuit is open. It only closes to power your equipment when the coil receives the 12V signal. This ensures zero parasitic draw in standby mode.
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