Greatly protect the 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 : 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 . 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. Fit for most cars, trucks, boats, yachts, caravans, etc.. Work with any 12 volt system. Fit for 265 283 305 307 327 350 383 400 396 402 427 454 472 502 260 289 302 351W 347 352 360 390 406 427 428 429 460 351C 351M 400M 273 318 340 360 361 383 400 413 426W 440 455 330 326 engines. Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Accessories: Random colors, don't accept the specified color Colour:Photo Color Material:Metal+PP Package Contents: 1x 175-185 degrees Cooling Fan Thermostat kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.