The electronic overload relay for R. STAHL's 8550 series is a component for load current monitoring of motors. It reliably reports an overload and safely shuts off the motor using a contactor. Together with the moulded case circuit breaker in the same series which is also available, these three components form a motor starter which reliably control powers up to 37 kW / 50 hp at 400 or 480 V (other powers available on request). Earth fault protection is also integrated, meaning that Ex d and Ex e motors are safely protected at all points. The broad adjustment range of the overload current optimises the variety of versions. Resetting in case of error is either done manually on the unit on-site via the integrated reset button, or electrically via the control system.
- Modular component for overload monitoring of motors up to 37 kW / 50 hp at 400/480 V
- The electronic relay is sensitive to a fluctuating ambient temperature
- Large clamping range for main terminals
- Tripping class E5, E10, E20 and E30 can be selected via type code
- Integrated earth protection
- Greater adjustment range of the overload trigger from 20 to 80 A
- Integrated reset button and electronic reset via 24 V DC control
