Solid state contactors for frequently switching on and off three-phase loads

Intended for frequently switching on and off three phase loads up to 5HP, Crydom's DRC Series solid state contactors are now available from RS Components. They are available in both contactor versions (DRC3P) and reversing contactor versions (DRC3R). DRC3P are available in either instantaneous turn-on (for motor control) or zero voltage turn-on (for resistive loads). The DRC3R include an interlock control that allows only off, forward and reverse operation in a safe mode: they switch instantaneously upon application of the control voltage and when an instantaneous change of direction is commanded they will delay the direction change by 100m/sec in order to prevent simultaneous forward and reverse operations. This solid state contactor can start/stop a three-phase AC motor at a maximum switching frequency of 9000 cycles/hour.