Schneider Electric LV481003 Vigirex RHU Modbus 30 mA-30 A 220-240 V AC Residual Current Monitoring Relay

The Schneider Electric LV481003 Vigirex RHU is a front-panel-mounting, Modbus-communicating residual current protection relay rated 220/240 V AC, with earth-leakage sensitivity adjustable from 30 mA to 30 A and a 0 to 4.5 s time delay. It is a type A relay that trips the associated circuit breaker via a compatible toroid when the set threshold is exceeded, and reports status over Modbus slave communication.

Technical Specifications

Certifications & Standards

• EN/IEC 60947-2 Annex M
• EN/IEC 60755

Selection Notes

The RHU adds Modbus slave communication and remote reset/test to the same type A, 30 mA to 30 A protection function as the non-communicating RHUs; choose it when the relay has to report status and alarms into a Smart Panel or Modbus-based supervisory system instead of being read locally. Remote reset means a fault can be acknowledged from the control system rather than requiring a technician at the panel face, which matters for unattended or remotely supervised switchboards. The same type A class and adjustable 0-4.5 s time delay as the RHUs support selective coordination between upstream and downstream earth-leakage relays.