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

The ABB RGU‑10B (P11951) is a Type B earth-leakage protection and monitoring relay, compliant with IEC 60755 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.

 Key Specifications

• Model/Code: RGU‑10B (P11951), Type B leakage relay  

• Residual Current Range (I∆n): 0.1–3 A AC/DC  

• Time Delay: Adjustable 0.1–10 s, supports instantaneous and inverse curves  

• Power Supply: 230 VAC ±20%, 50/60 Hz, consumption ~6 VA  

• Relay Outputs:

  • Trip Relay: SPDT, 10 A nominal, 15 A max @ 250 VAC, 2500 VA load  

  • Pre‑Alarm Relay: Same ratings, programmable threshold

• Reset Input: Optocoupled remote trip/reset, 230 VAC, 0.7 W  

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

• Environmental Specs:

  • Operating Temp: –10 °C to +50 °C, 5–95% RH  

  • Protection: IP20 (terminals), IP41 (front)  

• Physical Dimensions: 3 DIN modules, 52.5×85×67.9 mm, ~0.28 kg  

• Compliance: IEC 60755, IEC 62020, IEC 60947‑2 (Annex M)  

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