The ELRV is an electronic residual-current (earth-leakage) monitoring relay from ABB, designed to ensure safety in low-voltage distribution systems. Front-panel mountable and compliant with IEC/EN ‑ Annex M, it operates with an external toroidal sensor to detect leakage currents between .– A, triggering a shunt-trip on associated breakers. Configurable via DIP switches and featuring both automatic/manual reset modes. Powered by – V AC/DC.

Key Specifications

Part / Model No: ELRV, ABB CSGR
Auxiliary Supply: – V AC/DC ± %
Leakage Sensitivity (IΔn): .– A (adjustable via DIP settings K‑.//)
Response Time (Δt): – s (via DIP switches, with time scaling switch) ()
Output: changeover contact,  A @  V AC
Configurable Modes: Fail‑Safe ON/OFF, Auto/Manual Reset via DIP
Protection Rating:
- Front: IP with cover, IP without
- Terminal area: IP
Standards: IEC/EN ‑ Annex M certified
Consumed Power: ~ VA
Dimensions:  ×  mm panel cutout (depth – mm)
Operating Temperature: − °C to + °C; humidity ≤  %

ABB – ELR72V24 (2CSG452120R1202) – Front-Panel Electronic Residual-Current Relay