This manual covers the installation, operation, and technical specifications of the GEFRAN GZ series 3-phase solid-state relays for industrial applications.
The GEFRAN GZ series is a 3-phase zero-crossing solid-state relay designed for controlling resistive and inductive loads in industrial environments. It features integrated thermal protection, signal LEDs, and optional alarm outputs for overtemperature or interrupted load diagnostics. The device is available with either DC or AC control inputs and supports nominal currents up to 55A per phase.
| Nominal Voltage (Ue) | 400Vac (max. range 24...440Vac) |
|---|---|
| Nominal Frequency | 50/60Hz |
| Isolation Nominal Voltage (Ui) | 600Vac |
| Critical dV/dt OFF-state | 500V/µs (400Vac models) |
| Activation Time | ≤1/2 cycle |
| Working Temperature | -20°C...80°C |
| Max. Installation Altitude | 2000 slm |
| Pollution Level | 3 |
The maximum nominal current (Imax) for the GZ series is 3x55A (AC51) at 400/480/600Vac.
Yes, the GZ models must be used in conjunction with an appropriate heatsink accessory.