The CAR1C40DC12-S is an automotive relay designed for high-current DC load switching in vehicle electrical systems. It features a 1 Form A and 1 Form C contact arrangement with a maximum switching current of 40 A at 75 VDC and a maximum switching power of 560 W. The relay has a 12 VDC nominal coil with a pickup voltage of 8.4 VDC maximum, dropout voltage of 1.2 VDC minimum, and coil resistance of 80 O ±10%, drawing 1800 mW of power. It operates with a response time of =10 ms for both operate and release, maintains an insulation resistance of 100 MO at 500 VDC, and withstands dielectric strength of 500 VAC between coil and contacts. The relay is rated for -40 °C to +85 °C ambient temperature, resists shock up to 147 m/s² and vibration from 10–40 Hz at 1.27 mm displacement, and achieves 1×106 mechanical life cycles and 1×105 electrical life cycles. Common applications include automotive power distribution, motor control, and load switching in harsh vehicle environments where high reliability and compact sealed design are required.