2CSG452424R1202 ABB ELR72V24P Residual Current Monitor 72 mm

Why Choose the ABB ELR72V24P Residual Current Monitor?

The ABB ELR72V24P is a compact Type A electronic residual current monitor and relay designed for monitoring and protection of low-voltage electrical distribution networks. As part of the ABB ELR residual current relay series, it operates with an external toroidal transformer to detect earth leakage current and can be combined with suitable circuit breakers and shunt-trip devices to provide effective residual current protection.

The ELR72V24P provides adjustable residual current sensitivity from 0.03–30 A and adjustable tripping times from 0–5 seconds, giving engineers flexibility when coordinating earth leakage protection. A 60% pre-alarm threshold provides early indication of increasing leakage current, helping support preventative maintenance and continuity of operation.

With a 24–48 V AC/DC auxiliary supply and compact 72 × 72 mm front-panel format, the ELR72V24P is particularly suitable for industrial switchboards, machinery and control systems using low-voltage auxiliary supplies. The relay is designed for use with compatible ABB toroidal transformers and conforms to IEC/EN 60947-2 Annex M.

Key Advantages

• Electronic residual current monitoring and protection for low-voltage networks.
• Type A residual current detection for AC and pulsating DC residual currents.
• Wide 0.03–30 A adjustable sensitivity range.
• Adjustable 0–5 second tripping time supports protection coordination.
• 60% pre-alarm threshold provides early warning of leakage current.
• 24–48 V AC/DC auxiliary supply suits industrial control systems.
• Compact 72 × 72 mm front-panel design for switchboard integration.
• Designed for operation with an external ABB toroidal transformer.
• Compliant with IEC/EN 60947-2 Annex M.

Key Features

• ABB ELR series residual current relay.
• Type A residual current monitoring.
• 0.03–30 A adjustable residual current sensitivity.
• 0–5 second adjustable intervention time.
• 24–48 V AC/DC operating supply.
• 50/60 Hz rated frequency for AC operation.
• 60% pre-alarm threshold.
• Remote reset and autoreset functionality within the ELR platform.
• External toroidal transformer connection for leakage-current sensing.
• Output contacts for operation of associated protection equipment.
• Front-panel mounting for straightforward switchboard integration.
• Compact 72 × 72 × 88 mm enclosure.

Reliable Residual Current Protection for Electrical Distribution

Residual current relays monitor leakage to earth through a separate external toroidal transformer surrounding the active conductors. The toroid continuously detects the residual current and sends a signal to the relay; when the configured threshold and time conditions are reached, the relay switches its output contacts so associated protection equipment can disconnect the affected circuit.

The ABB ELR72V24P can form part of a coordinated protection arrangement using compatible ABB toroidal transformers, shunt trips, miniature circuit breakers and moulded-case circuit breakers. Its adjustable sensitivity, time delay and pre-alarm capability make it suitable for applications where both electrical safety and continuity of operation are important.

Typical Applications

• Low-voltage electrical distribution systems.
• Industrial switchboards and distribution panels.
• Machinery and automation control panels.
• Commercial electrical installations.
• Earth leakage monitoring and protection systems.
• Installations using 24–48 V AC/DC auxiliary control supplies.
• MCB and MCCB protection arrangements with suitable shunt-trip accessories.
• Electrical systems requiring adjustable residual current protection and pre-alarm indication.