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2CSG452120R1202 ABB ELR72V24 Residual Current Monitor 72 mm 24–48 V AC/DC
ABB ELR72V24 is a 72 mm Type A electronic residual current monitor with a 24–48 V AC/DC supply, adjustable 0.03–30 A sensitivity and external toroidal transformer input for low-voltage earth leakage protection.
£328.40
Why Choose the ABB ELR72V24 Residual Current Monitor?
The ABB ELR72V24 is a front-panel electronic residual current monitor designed for earth leakage monitoring and protection in low-voltage electrical distribution systems. As part of the ABB ELR residual current relay series, it operates in conjunction with a separate external ABB TR series toroidal transformer to continuously detect residual current and initiate circuit-breaker tripping when the configured threshold is exceeded.
Designed in a compact 72 × 72 mm front-panel format, the ELR72V24 provides adjustable residual current sensitivity and operating delay for flexible protection coordination. Its Type A residual current detection makes it suitable for monitoring alternating and pulsating DC residual currents, while adjustable Fail Safe and autoreset functions support dependable operation in industrial and commercial electrical installations.
The ELR72V24 operates from a 24–48 V AC/DC auxiliary supply at 50–60 Hz. Sensitivity can be configured across a broad 0.03–30 A range and the operating delay can be adjusted from 0–5 s, allowing the monitor to be coordinated with the protection requirements of the installation.
Key Advantages
- Electronic residual current monitoring and protection for low-voltage distribution systems.
- 24–48 V AC/DC auxiliary supply for integration into industrial control systems.
- Wide 0.03–30 A adjustable sensitivity range.
- Adjustable 0–5 s tripping delay supports selective protection coordination.
- Type A residual current detection for AC and pulsating DC residual currents.
- Works with separate ABB TR series toroidal transformers.
- Adjustable Fail Safe and autoreset functions.
- Front-panel mounting provides convenient access to settings, test and reset controls.
Key Features
- ABB ELR series residual current monitor.
- 72 × 72 mm front-panel format.
- 24–48 V AC/DC operating voltage.
- 50–60 Hz rated frequency.
- 0.03–30 A adjustable residual current sensitivity.
- 0–5 s adjustable delay time.
- 5 A at 250 V output contact capacity.
- Front-mounted TEST and RESET pushbuttons.
- LED indication for auxiliary supply and fault/trip status.
- Compliant with IEC/EN 60947-2 Annex M.
Reliable Residual Current Protection for Electrical Distribution
The ABB ELR72V24 operates with an external toroidal transformer installed around the active conductors of the monitored circuit. The toroid continuously detects the vector sum of the conductor currents; when leakage to earth produces an imbalance above the selected threshold, the ELR72V24 changes the state of its output contacts so that the associated protection system can disconnect the circuit.
Its adjustable 0.03–30 A sensitivity and 0–5 s operating delay allow the protection characteristics to be adapted to different installations and coordinated with upstream and downstream protective devices. Combined with suitable circuit breakers, shunt trips and ABB toroidal transformers, the ELR72V24 provides a flexible solution for residual current supervision in industrial and commercial distribution networks.
Typical Applications
- Industrial low-voltage distribution systems.
- Electrical switchboards and control panels.
- Earth leakage and residual current monitoring.
- Industrial machinery and production equipment.
- Commercial building electrical distribution.
- Protection systems using circuit breakers and shunt-trip releases.
Technical Specifications
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| Time Delay | Fixed | |
|---|---|---|
| Monitoring Function | Earth leakage / residual current | |
| Monitored Supply | AC/DC | |
| Series | ELR Residual Current Relays | |
| ABB order code | 2CSG452120R1202 | |
| Product type | Electronic residual current monitor / relay | |
| Residual current type | Type A | |
| Rated operational voltage | 24–48 V AC/DC | |
| Rated frequency | 50–60 Hz | |
| Maximum consumption | 4 VA | |
| Sensitivity adjustment | 0.03–30 A | |
| Delay time adjustment | 0–5 s | |
| Output contact capacity | 5 A at 250 V | |
| Toroidal transformer | External ABB TR series | |
| Adjustable functions | Fail Safe and autoreset | |
| Indicators | ON and FAULT LEDs | |
| Controls | TEST and RESET pushbuttons | |
| Mounting type | Front-panel mounting | |
| Mounting position | Any | |
| Connection type | Screw terminals | |
| Maximum conductor cross-section | 2.5 mm² | |
| Operating temperature | -10 to +60 °C | |
| Storage temperature | -20 to +70 °C | |
| Maximum relative humidity | 95% | |
| Dielectric test | 2.5 kV for 60 s | |
| Standard | IEC/EN 60947-2 Annex M | |
| Dimensions (H × W × D) | 72 × 72 × 88 mm | |
| Weight | 187 g |
Frequently Asked Questions
What is the ABB ELR72V24 used for?
The ABB ELR72V24 is used to monitor residual and earth leakage current in low-voltage electrical systems and provide a trip output when the detected current exceeds the configured protection threshold.
What supply voltage does the ABB ELR72V24 require?
The ELR72V24 operates from a 24–48 V AC/DC auxiliary supply at a rated frequency of 50–60 Hz.
What residual current sensitivity can be set on the ELR72V24?
The ELR72V24 provides an adjustable residual current sensitivity range of 0.03–30 A, allowing the monitoring threshold to be matched to the application.
Does the ABB ELR72V24 require a toroidal transformer?
Yes. The ELR72V24 operates with a separate external ABB TR series toroidal transformer, which detects the residual current in the monitored conductors.
Can the trip delay be adjusted on the ELR72V24?
Yes. The operating delay can be adjusted from 0–5 s, providing flexibility for protection coordination and selective tripping.
Trusted ABB Residual Current Monitoring Technology
ABB ELR residual current relays combine adjustable earth leakage sensitivity, configurable operating delays and external toroidal sensing to provide flexible residual current monitoring and protection for modern low-voltage electrical distribution systems.
