Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
2CSG110100R1211 ABB TR4 Toroidal Transformer 110mm
ABB TR4 is a closed-core 110 mm toroidal transformer with a 500/1 transformation ratio for residual-current measurement with compatible ABB earth-leakage and residual current monitoring relays.
£206.02
Why Choose the ABB TR4 Toroidal Transformer?
The ABB TR4 is a closed-core toroidal transformer designed for use with ABB residual current monitoring and earth-leakage relay systems. With a generous 110 mm internal diameter, it allows the protected circuit conductors to pass through the transformer so that residual current can be measured without placing the monitoring device directly in the load circuit.
Designed for use with compatible ABB RD2, RD3 and ELR residual current relays, the TR4 detects the current imbalance associated with earth leakage and provides the measurement signal required by the connected monitoring relay. Its 500/1 transformation ratio and 100 mA minimum measurable current make it suitable for a wide range of commercial and industrial earth-fault monitoring applications.
The TR4 uses a robust closed-core construction and can be installed in any orientation. With a maximum insulating voltage of 1000 V AC, IP20 protection and a broad operating temperature range, it provides a dependable sensing component for ABB residual current monitoring systems.
Key Advantages
- 110 mm internal diameter accommodates multiple conductors and larger cable arrangements.
- Designed for accurate residual-current measurement in earth-leakage monitoring systems.
- Compatible with ABB RD2, RD3 and ELR residual current relays.
- 500/1 transformation ratio for integration with compatible ABB monitoring relays.
- 100 mA minimum measurable current.
- Closed-core construction provides a robust fixed installation.
- Can be installed in any mounting orientation.
- Suitable for commercial and industrial switchboards, control panels and electrical distribution systems.
Key Features
- ABB TR series toroidal transformer.
- 110 mm internal aperture.
- Closed, non-openable core.
- 500/1 transformation ratio.
- 100 mA minimum measurable current.
- 1000 V AC maximum insulating voltage.
- 2.5 kV dielectric test voltage at industrial frequency for 1 minute.
- 40 kA for 1 second maximum thermal overload.
- IP20 protection.
- Screw-terminal connections for conductors up to 2.5 mm².
Reliable Residual Current Measurement
The ABB TR4 operates by surrounding the live conductors of the monitored circuit. Under normal conditions, the vector sum of the currents passing through the toroid is effectively zero. If current leaks to earth, an imbalance develops and the TR4 provides a corresponding measurement signal to the connected residual-current monitoring relay.
With its 110 mm aperture, the TR4 is particularly useful where several conductors or larger cable sizes must pass through the same transformer. The toroid itself performs the residual-current measurement; the connected ABB RD or ELR relay provides the monitoring, adjustable sensitivity, timing and associated alarm or trip functionality appropriate to the system design.
Typical Applications
- Earth-leakage and residual-current monitoring systems.
- Commercial electrical distribution boards.
- Industrial switchboards and control panels.
- Machinery and automation electrical systems.
- Three-phase feeder and distribution circuits.
- Electrical installations using ABB RD2 or RD3 residual current relays.
- Systems using compatible ABB ELR residual current relays.
- Applications requiring a 110 mm closed-core toroidal transformer.
Technical Specifications
Tick the specs you need, then view products that match.
| Aperture (mm) | 240 mm | |
|---|---|---|
| Rated Primary Current (A) | 300 A | |
| Device Type | Solid-core CT | |
| Series | TR | |
| Product group | Earth Monitoring Devices | |
| SKU | TR4 | |
| ABB order code | 2CSG110100R1211 | |
| GTIN / EAN | 8012542020608 | |
| Product type | Toroidal transformer | |
| Core type | Closed / non-openable | |
| Internal diameter | 110 mm | |
| Minimum measurable current | 100 mA | |
| Transformation ratio | 500/1 | |
| Maximum insulating voltage | 1000 V AC | |
| Dielectric test voltage | 2.5 kV for 1 minute | |
| Maximum thermal overload | 40 kA for 1 second | |
| Operating temperature | -10 to +70 °C | |
| Storage temperature | -20 to +80 °C | |
| Installation position | Any | |
| Connections | Screw terminal board | |
| Maximum connection cross-section | 2.5 mm² | |
| Protection rating | IP20 | |
| Overall dimensions (H × W × D) | 160 × 150 × 50 mm | |
| Net weight | approx. 0.43–0.53 kg | |
| RoHS | Compliant with Directive 2011/65/EU |
Frequently Asked Questions
What is the ABB TR4 used for?
The ABB TR4 is a toroidal transformer used with compatible residual current monitoring relays to detect earth-leakage current in electrical circuits. The circuit conductors pass through its aperture, allowing the transformer to detect current imbalance and provide a measurement signal to the connected relay.
What is the internal diameter of the ABB TR4?
The TR4 has an internal diameter of 110 mm, providing space for multiple conductors or larger cable arrangements to pass through the transformer.
Is the ABB TR4 an openable toroidal transformer?
No. The TR4 uses a closed, non-openable core. ABB also offers separate openable toroidal transformer variants for applications where installation around existing conductors is required.
Which ABB relays can be used with the TR4?
The ABB TR4 is designed for use with compatible ABB residual current monitoring equipment, including RD2, RD3 and ELR residual current relays.
What is the transformation ratio of the ABB TR4?
The TR4 has a 500/1 transformation ratio and a minimum measurable residual current of 100 mA, supporting residual-current measurement for compatible ABB earth-leakage monitoring systems.
Trusted Earth-Leakage Monitoring from ABB
ABB TR toroidal transformers provide dependable residual-current sensing for commercial and industrial electrical systems, combining robust construction, multiple aperture sizes and compatibility with ABB residual-current monitoring relays for flexible earth-leakage monitoring solutions.
