Automotive relay Panasonic CM 12V DC single changeover (NO 35A / NC 20A) MPN CM112

The Panasonic CM automotive relay CM112 is a 12 V DC single changeover (SPDT) relay intended for switching electrical circuits in vehicles and automotive equipment. It combines compact dimensions and a straightforward design to control loads such as lamps, electric motors, heating elements and other accessories. The relay features one normally open contact rated for high-current switching and one normally closed contact for control or safety circuits.

Advantages

The relay provides distinct current ratings for the normally open and normally closed contacts, allowing flexible use in primary high-current circuits and secondary control paths. Its 12 V DC coil is compatible with standard automotive electrical systems, and the compact form factor facilitates installation in relay boxes, fuse panels or custom mounting locations. The construction is designed for durable electrical switching under typical vehicle operating conditions.

Suitable for

• Switching automotive lighting circuits (headlamps, auxiliary lights)
• Controlling electric motors (cooling fans, window motors, pumps)
• Powering heating and defrost systems
• Interfacing alarm, relay logic and accessory circuits

Key specifications

• Coil voltage: 12 V DC
• Contact configuration: Single changeover (SPDT)
• Normally open contact rating: 35 A
• Normally closed contact rating: 20 A
• Intended application: Automotive electrical systems
• Mounting: Snap-in or socket mounting compatible form factor

How to use

Install the relay in a suitable automotive relay socket or secure it in the vehicle’s relay panel following the vehicle manufacturer’s wiring diagrams. Connect the coil terminals to the 12 V supply and control circuit, ensuring proper polarity if required by the installation. Route the high-current load through the common and normally open contacts when switching power to accessories; use the normally closed contact for circuits that must remain powered when the relay is not energized. Verify all connections are secure, use appropriately rated wiring and fuses, and confirm correct operation before returning the vehicle to service.

Recommendations

Use wires and fuses sized for the stated contact ratings, protect the relay from prolonged exposure to moisture and excessive vibration when possible, and follow vehicle wiring standards. For prolonged reliability, avoid continuous operation at maximum rated current and allow adequate ventilation around the relay.