Description:
The CMA31-C is a heavy-duty automotive relay manufactured by HKE (Zhejiang HKE), designed to switch high-current electrical loads in vehicles and other 12V DC systems using a low-power control signal. It operates as an electromagnetic relay with a 12V DC coil, allowing a small trigger current (from a switch, sensor, or control module) to safely energize and switch a much larger load current — a fundamental building block in automotive wiring, aftermarket electronics, and 12V power control circuits.
Built with an SPDT (Single Pole, Double Throw / 1 Form C) contact configuration, this relay provides both normally-open and normally-closed switching paths from a single common terminal, making it versatile for a range of switching applications including headlights, fans, horns, fuel pumps, lighting circuits, and other accessory loads. The contacts are rated for up to 30A at 14VDC, giving it enough switching capacity to handle demanding automotive and industrial loads reliably.
The relay features a compact, fully sealed plastic housing that protects the internal contacts and coil from dust, moisture, and vibration — an important consideration in the harsh, high-vibration environment of a vehicle engine bay or chassis. It includes a metal mounting bracket with a bolt-hole, allowing it to be securely fastened to a vehicle body panel, relay box, or DIN rail bracket, along with standard male spade (quick-connect) terminals for simple, tool-free wiring connections.
Key Specifications:
- Manufacturer: HKE (Zhejiang HKE)
- Part Number: CMA31-C
- Coil Voltage: DC 12V
- Contact Configuration: SPDT / 1 Form C (Change-over)
- Contact Rating: 30A @ 14VDC
- Contact Material: Silver Alloy
- Dielectric Strength: 500VAC (1 minute)
- Electrical Life: 100,000 operations
- Operating Temperature Range: -40°C to +85°C
- Mounting Type: Bracket Mount (bolt-hole tab)
- Terminal Type: Quick-connect spade terminals
Applications:
Automotive accessory switching (lights, horns, fans, fuel pumps), power window and central locking systems, motor control circuits, aftermarket 12V electronics, marine and RV wiring, and general-purpose high-current DC switching applications.
Package Includes:
- 1 x HKE CMA31-C 12V 30A Automotive Relay
