An auto-reset circuit breaker is a vehicle safety device that prevents electrical problems. If it detects a problem, such as increased temperature, it will physically cut off the current to prevent further issues. It functions similarly to an automatic switch, shutting down the power source without user intervention. Sierra's CB41100 Resettable, Push Button Circuit Breaker is an appropriate replacement for standard panel-mounted breakers. It has white buttons for DC and black buttons for AC. The circuit breaker fits into a 3/8" hole and is compatible with Sierra's MP39210 Weatherproof Boot Nut. Each package contains one circuit breaker. Key Features: Popular panel-mounted breaker replacement White buttons for DC and black buttons for AC are used. 3 amps @ 12 volts DC Fits into a 3/8" hole Type of Fit: Universal Fit Product Specifications: SKU: CB41100 UPC: 808282293147 Weight: 0.09 LBS Manufacturer Part Number (MPN): CB41100 Quantity: 1 Note: