Benning MA 4 for active and passive testing of 1- and 3-phase devices (including welding machines), as well as extension cables. Connection for test items with CEE 16 A/230 V, CEE 16 A/400 V and CEE 32 A/400 V plugs. Measuring adapter can be fully loaded with 32 A. Supported measurements: RPE protective conductor resistance, RISO insulation resistance, IDiff. differential current, IEA equivalent leakage current, tripping time and tripping current of PRCDs. Equipment and cable function test including line break, short circuit and rotating field test. Self-test: deliberate connection of a device residual current (1 mA/ 3 mA) to test the entire test system. 7 status LEDs and 1 power LED. Robust and dust/waterproof protective case IP 67. Plug-in technology other. Material of the insulation material other. Measuring circuit category other.