Product size: 7.4 * 4.8 * 4.5CM Product packaging: OPP Packing size: 10 * 5 * 5CM 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, press 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 press 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 press the long handle back to the original position. Product material: plastic + metal Package Checklist: 1 x Circuit Breaker Notes: 1. 1 inch = 2.54 cm 2. 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! The circuit breaker can protects your trolling motor from electrical damage, prevents excessive current and stops power surges from damaging Amps Current 30A 40A 50A 60A 70A 80A 100A 120A 150A 200A 250A 300A, waterproof Manual reset button, manual control and easy to operate with manual reset arm, also can be used as a Kill Switch Surface Mount, mount on panel or firewall. Water resistant housing, protective stud insulator included, splash & dust Proof Mainly used for car audio and Amps protection and in trucks, boat, RVs , marine, buses ect; also used in battery charges and DC sound system