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

The ABB RGU‑10 is a Type A electronic earth-leakage protection relay designed for industrial control panels. It features true-RMS (TRMS) leakage measurement via an external current transformer (WG/WGC series), with programmable trip/pre‑alarm thresholds and delays. The device includes two relay outputs, a reset/test interface, and a backlit display for real-time monitoring and control.

 Key Specifications

• Model: RGU‑10 (discontinued; replaced by RGU‑10A)  

• Leakage Detection: TRMS, Type A (IEC 61008.1); adjustable IΔn: 0.03–3 A or 0.03–30 A  

• Delay Range: 0.02–10 s; includes instantaneous/inverse modes  

• Power Supply: 110–230 VAC or 230 VAC, 50/60 Hz; ~6 VA consumption  

• Relay Outputs:

  • Trip relay: SPDT 6 A (10 A peak), 250 VAC, 2 500 VA

  • Pre‑alarm relay: SPDT same ratings  

• Reset/Test Input: Optocoupled, 230 VAC max, 0.7 W  

• Interface: 3-module DIN rail, display with five programming keys, TEST & RESET buttons  

• Dimensions: 52.5 × 85 × 67.9 mm; Weight ≈ 234 g  

• Protection: IP20 terminals, IP41 front; double insulation (Class II)  

• Operating Temp/Humidity: –10 °C to +50 °C (operating); –40 °C to +85 °C (storage); 5–95 % RH  

• Mounting: DIN‑rail EN 50022 or panel (72 × 72 mm kit)