Why Choose the ABB ELR96PF Residual Current Monitor?
The ABB ELR96PF 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 continuously monitor earth leakage current and control associated circuit protection equipment when the selected residual current threshold is exceeded.
The ELR96PF combines adjustable residual current sensitivity and trip delay with Fail Safe operation, automatic reset and frequency filtering. Its frequency filter improves immunity to harmonic current components that do not represent an actual earth fault, such as those associated with electronic filters and variable frequency drives, helping reduce unwanted operation in electrically demanding installations.
Designed for 96 × 96 mm front-panel mounting, the ELR96PF supports 110, 230 and 400 V AC auxiliary supplies and operates at 50/60 Hz. Adjustable sensitivity from 0.03–30 A and trip delay from 0–5 s provide flexibility for commercial and industrial switchboards, machinery and low-voltage distribution systems.
Key Advantages
- Electronic Type A residual current monitoring for low-voltage distribution networks.
- Frequency filtering improves immunity to harmonic components associated with electronic equipment and frequency converters.
- Adjustable 0.03–30 A residual current sensitivity supports a wide range of protection requirements.
- Adjustable 0–5 s trip delay enables protection coordination and selectivity.
- Fail Safe and automatic reset functions support dependable system operation.
- Fault Memory LED provides a persistent indication that the relay has operated, even after automatic reset.
Key Features
- ABB ELR96PF residual current monitor.
- Type A residual current detection.
- Frequency filter function for improved immunity to harmonic current components.
- 0.03–30 A adjustable residual current sensitivity.
- 0–5 s adjustable operating delay.
- Fail Safe function selectable according to application requirements.
- Automatic reset and remote reset functionality.
- Fault Memory LED with manual reset.
- 110, 230 and 400 V AC auxiliary supply.
- 50/60 Hz rated frequency.
- Designed for use with compatible external ABB toroidal transformers.
- Complies with IEC/EN 60947-2 Annex M.
Advanced Earth Leakage Monitoring with Frequency Filtering
The ABB ELR96PF operates with an external toroidal transformer through which the live conductors of the protected circuit are routed. The toroid continuously detects residual current imbalance and sends the corresponding signal to the relay. When the measured residual current exceeds the selected threshold for the configured delay period, the ELR96PF switches its output contacts so associated tripping equipment can disconnect the protected circuit.
The ELR96PF is distinguished by its frequency filtering function, which makes the relay more resistant to harmonic current components that can occur in installations containing electronic filters and frequency converters. Together with adjustable sensitivity, adjustable trip delay, Fail Safe operation and fault memory indication, this makes the ELR96PF particularly suitable for sophisticated industrial and commercial electrical systems.
Typical Applications
- Industrial low-voltage distribution systems.
- Commercial electrical switchboards.
- Variable frequency drive and motor control installations.
- Industrial machinery and automation systems.
- Electrical systems containing harmonic-producing electronic equipment.
- Earth leakage protection using external ABB toroidal transformers.
