Features:High Ampere thermal trip circuit breaker with manual reset switch,suitable for other electrical systems. Ideal for use in harsh environments such as racing cars to provide protection against current overload or short circuits. Protective rubber cap prevents unneceary short circuits. Commonly used in truck, bus, RV and marine applications;also used for battery cost and audio systems.Switchable surface mount circuit breakers are commonly found inauxiliary and acceory circuits for truck, bus, camper- and marine systems.Sealed waterproof unit for engine compartment and bilge areas.The trip switch manual can quickly disconnect the circuit in an emergency.Connecting bolt size-M6 x 2 nut with integral locking ring to preventloosening due to vibration. Specifications: Circuit rating: 30A, 40A, 50A, 60A, 70A, 80A, 90A, 100, 120A, 140A, 150A, 200A, 250A, 300A (optional)Voltage rating: 12-48 VInterrupt rating: 3000A @ 30 VOperating temperature: -32 C to 82 CStorage temperature: -34 C-149 CNumber of poles: 2Weather rating: IP67Certificate: SAE J1627 J1171 / UL1500Color: Blackcase is made of thermoplastic,UL Rated 94V0 mounting hole (stud)size: 6mm / 1/4 inch-28 inch / inchsize: 74x49x44mm / 2.91 x 1.92 x 1.73 material: plastic + metal How to use: Working method:1. Open circuit protection: When the current reaches the disconnection value,the long handle automatically pops open and cuts off the power.Generally, the short-circuit situation jumps off.After the fault is removed, pre the long handle back to the original.Bit can form a pathway.2. Manual power off: We need to disconnect the circuit during the modification,and directly pre the oval red button on the fuse.At this time, the long handle automatically pops open to cut off the power.Connect it as above, then pre the long handle back to the original position. Package Checklist:1 x Circuit Breaker Notes:1. 1 inch = 2.54 cm2. Please measure it yourself to choose the right size.3. Due to the difference between the different displays, the picture may not reflect the actual color of the item. Thank you!