ZBZ-4.0Z Mine flameproof type electric coal drill comprehensive protective device 1. This device is used for the remote control and protection of short circuit, overload and leakage of 127V 1.2KW portable electric coal drill in the coal mine. 2. Technical data: Rated voltage (V): 1140(660)/133 660(380)/133 Rated current ( A ): 1.27(2.19)/10.85 2.19(3.79)/10.85 3. Drill power : 1.2KW 4. Resistance tripping value of leakage: 3KΩ 5. Leakage tripping time: ≤0.25s 6. Protected distance of short circuit: 0-300m