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.

Key Specifications

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)

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

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