ABB – RGU-10B – Type B Residual-Current (Earth-Leakage) Relay with Pre-Alarm

The ABB RGU‑B (P) is a Type B earth-leakage protection and monitoring relay, compliant with IEC for mixed AC/DC residual current detection. Designed for demanding electrical installations—such as UPS, VFDs, and PV systems—it includes backlit LCD, two programmable outputs (trip + pre‑alarm), and a remote trip/reset input. Compatible with external WGC-TB current transformers for full-spectrum protection.

• Model/Code: RGU‑B (P), Type B leakage relay  

• Residual Current Range (I∆n): .– A AC/DC  

• Time Delay: Adjustable .– s, supports instantaneous and inverse curves  

• Power Supply:  VAC ±%, / Hz, consumption ~ VA  

• Relay Outputs:

  • Trip Relay: SPDT,  A nominal,  A max @  VAC,  VA load  

  • Pre‑Alarm Relay: Same ratings, programmable threshold

• Reset Input: Optocoupled remote trip/reset,  VAC, . W  

• Display/Interface: Backlit LCD (green = normal, red = trip), seven tactile keys, two status LEDs  

• Environmental Specs:

  • Operating Temp: – °C to + °C, –% RH  

  • Protection: IP (terminals), IP (front)  

• Physical Dimensions:  DIN modules, .××. mm, ~. kg  

• Compliance: IEC , IEC , IEC ‑ (Annex M)  

• External Sensor Support: Works with WGC‑TB series current transformers