VB6/VB7 - Compact Rreversing Contactors The mechanical lock between the two contactors prevents one of the contactors from switching on, as long as the other is still switched on and vice versa. Switching over reversing contactors too quickly poses the risk of a phase short circuit. This is the case if the arc of the contactor switching off has not yet extinguished and the contacts of the contactor switching on are already closed. To avoid this risk, the two contactor coils must be switched to idle for a minimum of 50 ms during the switchover process and electrically locked against each other. Technical specifications Rated operating voltage: 220 to 240Vac Mechanical lifespan: 10 m switching cycles Ambient temperature: -25°C to +55°C Selection guide Type Auxiliary switch Motor rating (AC2/3) Motor rating (AC2/3) 220/240V 380/440V VB 6-30-10 1 NO 2.2 kW 4kW VB 6-30-01 1 NC 2.2 kW 4kW VB 7-30-10 1 NO 3kW 5.5kW VB 7-30-01 1 NC 3kW 5.5kW