Greatly protect the safety of automotive cooling system equipment. When the system short-circuit current is too large, the circuit breaker automatically open. This kit is set up to turn your electric fan on at 185 degrees and shut off at 175 degrees. The thermostat MUST be grounded through the threads to the engine in order for it to work, and the engine MUST be grounded. A thermostat can protect the engine from overheating or overcooling, thereby extending the vehicle's lifespan. Improving driving safety: An overheated engine can cause the oil to deteriorate, thereby affecting the lubrication effect of the engine and increasing the risk of engine failure. And a thermostat can avoid this situation and improve driving safety. Increase vehicle performance: Appropriate engine temperature can improve engine performance, thereby increasing vehicle power and acceleration performance. Rated voltage: 12V Contact switching current: 40A/14VDC Contact form: one set of normally open Universal.