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2CSM242120R1201 ABB RD2-48 Residual Current Relay 48–150 V AC/DC
ABB RD2-48 Type A electronic residual current relay with 48–150 V AC/DC supply, selectable 0.03–2 A sensitivity and adjustable instantaneous-to-5-second intervention time for earth leakage monitoring.
£259.42
Why Choose the ABB RD2-48 Residual Current Relay?
The ABB RD2-48 is a compact Type A electronic residual current relay designed for earth leakage monitoring and protection in low-voltage electrical installations. As part of the ABB RD2 residual current relay series, it operates with an external ABB TR-series toroidal transformer to detect leakage currents and provide a switching output for associated protection equipment.
The RD2-48 provides selectable residual current sensitivity and intervention time through front-accessible minidip settings, allowing the protection characteristics to be adapted to different circuits. Sensitivity settings range from 0.03–2 A, while selectable tripping times include instantaneous operation and delays up to 5 seconds, supporting coordinated residual current protection.
Designed for 48–150 V AC/DC auxiliary supplies, the RD2-48 is particularly suitable for industrial control systems and electrical panels using low-voltage control power. Its compact 2-module DIN-rail format, Type A residual current detection and compatibility with ABB TR toroidal transformers make it a practical solution for earth leakage monitoring in industrial and commercial installations.
Key Advantages
- Compact electronic residual current relay for earth leakage monitoring and protection.
- Type A residual current detection for AC and pulsating DC residual currents.
- 48–150 V AC/DC operating voltage suitable for low-voltage auxiliary systems.
- Selectable 0.03–2 A residual current sensitivity.
- Adjustable intervention time from instantaneous to 5 seconds.
- Minidip adjustment simplifies sensitivity and intervention-time configuration.
- Designed for use with ABB TR-series external toroidal transformers.
- Compact 2-module DIN-rail design saves distribution-board space.
Key Features
- ABB RD2-48 electronic residual current relay.
- 48–150 V AC/DC operating voltage.
- 50/60 Hz frequency for AC operation.
- Type A residual current detection.
- Sensitivity settings of 0.03, 0.1, 0.3, 0.5, 1 and 2 A.
- Tripping-time settings of instantaneous, 0.3, 0.5, 1, 2 and 5 seconds.
- NC-C-NO changeover output contact.
- Output contact capacity of 10 A at 250 V AC for resistive loads.
- IP20 protection degree.
- Operating temperature range of -5 to +40 °C.
- 2-module DIN-rail mounting.
- Designed for use with external ABB TR-family toroidal transformers.
Reliable Residual Current Protection and Monitoring
Residual current relays operate with an external toroidal transformer installed around the active conductors of the monitored circuit. The toroid detects an imbalance caused by leakage to earth and supplies the corresponding signal to the relay, allowing the RD2-48 to operate its output contact when the selected residual current threshold and intervention conditions are reached.
The ABB RD2-48 is designed specifically for use with ABB TR-family external toroidal transformers. Its selectable sensitivity and time-delay settings allow the monitoring system to be adapted to different applications while the compact DIN-rail format enables straightforward installation in distribution boards and industrial control panels.
Typical Applications
- Residual current and earth leakage monitoring systems.
- Industrial low-voltage distribution boards.
- Electrical switchboards and control panels.
- Industrial machinery and automation systems.
- Commercial electrical distribution installations.
- Systems using 48–150 V AC/DC auxiliary control supplies.
- Protection systems using ABB TR-series toroidal transformers.
- Circuits requiring adjustable residual current sensitivity and tripping delay.
Technical Specifications
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| Monitored Supply | AC/DC | |
|---|---|---|
| Monitoring Function | Earth leakage / residual current | |
| Series | RD2 | |
| ABB order code | 2CSM242120R1201 | |
| Product group | Earth Monitoring Devices | |
| Product type | Electronic residual current relay | |
| Residual current type | Type A | |
| Operating voltage | 48–150 V AC/DC | |
| Frequency | 50 / 60 Hz | |
| Sensitivity settings | 0.03 / 0.1 / 0.3 / 0.5 / 1 / 2 A | |
| Tripping-time settings | Instantaneous / 0.3 / 0.5 / 1 / 2 / 5 s | |
| Output contact type | NC-C-NO changeover | |
| Output contact capacity | 10 A at 250 V AC, resistive load | |
| Operating temperature | -5 to +40 °C | |
| Protection rating | IP20 | |
| Mounting type | DIN rail | |
| Width | 2 modules / 35 mm | |
| Dimensions (H × W × D) | 85 × 35 × 65 mm | |
| Product net weight | 0.105 kg | |
| Standard | IEC/EN 62020 | |
| EAN | 8012542537809 |
Frequently Asked Questions
What is the ABB RD2-48 used for?
The ABB RD2-48 is used for residual current and earth leakage monitoring in low-voltage electrical systems, operating with an external toroidal transformer to detect leakage currents and control associated protection equipment.
What supply voltage does the RD2-48 require?
The RD2-48 operates from a 48–150 V AC/DC supply, making it suitable for industrial installations using low-voltage auxiliary control power.
What residual current settings are available on the RD2-48?
The relay provides selectable sensitivity settings of 0.03, 0.1, 0.3, 0.5, 1 and 2 A, allowing its response threshold to be configured for different applications.
Can the tripping delay be adjusted on the ABB RD2-48?
Yes. The RD2-48 provides instantaneous, 0.3, 0.5, 1, 2 and 5 second intervention-time settings, enabling coordination with other protection devices.
Which toroidal transformers can be used with the RD2-48?
The RD2-48 is designed for use with compatible ABB TR-family external toroidal transformers, which detect residual current in the monitored conductors and provide the sensing signal to the relay.
Trusted ABB Earth Monitoring Technology
ABB RD2 residual current relays provide configurable earth leakage monitoring for low-voltage electrical systems, combining external TR-series toroidal sensing with adjustable sensitivity and intervention-time settings in a compact DIN-rail format.
