Double-pole breakers have two hot wires that are connected by a single neutral wire . That means if there's a short circuit on either of the poles' hot wires, both trip. These breakers can be used to serve two separate 120-volt circuits or they can serve a single 240-volt circuit, such as your central AC's circuit. Specifications: Place of Origin: China Protection Level: IP54 type: DISTRIBUTION BOX External Size: 90*140*60mm Material: ABS and Poly Carbonate (PC) Color: White base, Smoky dark window Accessories: DIN rail, brass terminal Item Name: 2 Ways MCB distribution box Package Includes: