Why Choose the ABB ELR96V24 Residual Current Monitor?
The ABB ELR96V24 is an electronic Type A residual current monitor and relay designed for monitoring and protection of low-voltage electrical distribution networks. As part of ABB’s Earth Monitoring Devices range, it operates with an external toroidal transformer to detect residual current and provide a trip signal to associated circuit protection equipment.
Designed for 96 × 96 mm front-panel mounting, the ELR96V24 provides a practical earth leakage monitoring solution for switchboards, distribution panels and industrial control systems. It is designed for use with compatible external toroidal transformers and can form part of a coordinated protection system with suitable miniature or moulded-case circuit breakers and their associated tripping devices.
The ELR96V24 is specifically designed for a 24–48 V AC/DC auxiliary supply with a ±20% tolerance, making it well suited to industrial control systems that use low-voltage auxiliary power. Its Type A residual current characteristic enables detection of sinusoidal AC and pulsating DC residual currents, while its 50–60 Hz operating frequency and compact panel-mounted construction support integration into a wide range of commercial and industrial applications.
Key Advantages
- Electronic Type A residual current monitoring for low-voltage electrical networks.
- 24–48 V AC/DC auxiliary supply is ideal for low-voltage industrial control systems.
- Designed for use with an external toroidal transformer for flexible residual current sensing.
- 96 × 96 mm front-panel format provides straightforward switchboard integration.
- Suitable for coordinated protection with compatible MCBs and MCCBs.
- Complies with IEC/EN 60947-2 Annex M for residual current relay protection systems.
Key Features
- ABB ELR residual current relay series.
- Type A residual current detection.
- 24–48 V AC/DC operating voltage.
- ±20% operating voltage tolerance.
- 50–60 Hz rated frequency.
- Designed for mixed-system applications.
- Operates with compatible external ABB toroidal transformers.
- Front-panel mounting for electrical switchboards and control panels.
- 96 × 96 mm front dimensions.
- 92 × 92 mm panel cut-out.
- Designed for integration with suitable circuit breakers and tripping accessories.
- Complies with IEC/EN 60947-2 Annex M.
Reliable Low-Voltage Earth Leakage Monitoring
The ABB ELR96V24 operates with an external toroidal transformer through which the active conductors of the protected circuit are routed. Under normal operating conditions, the vector sum of the currents passing through the toroid is effectively zero. If insulation deterioration or an earth fault causes current to leak outside the intended circuit, the resulting imbalance is detected by the transformer and transmitted to the residual current monitor.
The ELR96V24 evaluates the residual current signal and can operate associated tripping equipment when the configured protection conditions are reached. Its 24–48 V AC/DC supply makes this version particularly suitable for industrial automation and control systems using low-voltage auxiliary power, while compliance with IEC/EN 60947-2 Annex M supports coordinated residual current protection when combined with appropriate circuit breakers and tripping accessories.
Typical Applications
- Industrial low-voltage distribution systems.
- Commercial electrical switchboards.
- Industrial control panels using 24–48 V auxiliary supplies.
- Machinery and automation systems.
- Earth leakage monitoring with external toroidal transformers.
- Protection systems incorporating suitable MCBs or MCCBs and remote tripping accessories.
