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

The ABB RGU‑ 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.

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

• Leakage Detection: TRMS, Type A (IEC .); adjustable IΔn: .– A or .– A  

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

• Power Supply: – VAC or  VAC, / Hz; ~ VA consumption  

• Relay Outputs:

  • Trip relay: SPDT  A ( A peak),  VAC,   VA

  • Pre‑alarm relay: SPDT same ratings  

• Reset/Test Input: Optocoupled,  VAC max, . W  

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

• Dimensions: . ×  × . mm; Weight ≈  g  

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

• Operating Temp/Humidity: – °C to + °C (operating); – °C to + °C (storage); – % RH  

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