GZ Three-phase solid state relay, up to 55A



  • 3-phase "zero crossing" solid state relay for control of resistive and inductive loads.
  • Integrated device designed for industrial applications demanding control of high power levels and frequent switching, with loads up to 3 x 55A (AC51) at 400/480/600Vac.
  • Control is logic type (Vdc), signaled by LEDs. Each phase is controlled by means of semiconductors.
  • The constructive elements, special production process, and new, sturdy case, provide excellent reliability and continuity of service.
  • All versions are protected against overvoltages and against junction overtemperature, with signal LEDs and (optional) solid-state alarm output.
  • The device is supplied complete with covers to protect against direct contacts (covers are removable for wiring).
  • Accessories are available: heatsink, thermostats, fans, fuses, and fuse holders.


  • The GZ models must be used in conjunction with an appropriate heatsink (Accessory).
  • Installation must precisely observe the warnings contained in the installation notes.


Zero-voltage switching.
Current range: 10A to 55A

  • 3-phase alternating current solid state relay
  • Zero crossing switching
  • 3-phase nominal current 3×10/25/40/55A
  • Nominal voltage up to 600VCArms
  • Control range: 5…32Vdc
  • Optoinsulation (input/output) 4000Vrms
  • Integrated overvoltage suppressor
  • Non-repetitive voltage up to 1200Vp
  • In Conformity with EN60947-4-3 and UL508