Why Choose the ABB TR5 Toroidal Transformer?
The ABB TR5 is a reliable closed-core toroidal transformer designed for residual current monitoring in electrical distribution and industrial installations. With an internal diameter of 210 mm, it provides a practical sensing solution for larger conductors and cable groups used with compatible ABB earth leakage and residual current monitoring devices.
As part of the ABB TR toroidal transformer series, the TR5 detects residual current by surrounding the live conductors of the monitored circuit. Any imbalance between the currents passing through the toroid produces a measurement signal for the connected residual current relay or monitor, enabling effective earth leakage supervision and protection.
The TR5 features a closed core, 210 mm internal diameter, IP20 protection and an operating temperature range of -10 to +70 °C. ABB specifies the transformer for use with compatible RD2/RD3 and ELR residual current relays and monitors, making it suitable for distribution boards, switchboards and industrial electrical systems.
Key Advantages
- Large 210 mm internal diameter accommodates substantial conductors and grouped cables.
- Closed-core construction provides dependable residual current sensing.
- Designed for integration with compatible ABB residual current monitoring devices.
- 300 mA minimum measurable current for residual current monitoring applications.
- IP20 protection rating for installation within suitable electrical enclosures.
- Can be installed in any mounting position for flexible panel design.
Key Features
- ABB TR series toroidal transformer.
- 210 mm internal diameter.
- Closed, non-openable core construction.
- 300 mA minimum measurable current.
- IP20 protection degree.
- -10 to +70 °C operating temperature.
- Suitable for use with compatible ABB RD2/RD3 and ELR devices.
- Designed for residual and earth leakage current monitoring.
Reliable Residual Current Monitoring
Toroidal transformers are used with residual current monitoring equipment to detect an imbalance between the currents flowing through the conductors of an electrical circuit. Under normal operating conditions the vector sum of these currents is effectively zero; leakage to earth creates an imbalance that can be detected by the toroidal transformer and evaluated by the connected monitoring relay.
The ABB TR5's large 210 mm aperture makes it particularly useful where several conductors or large cable sizes must pass through a single sensing transformer. When paired with a compatible ABB residual current monitor or relay, it provides a dependable basis for earth leakage supervision in industrial and commercial electrical distribution systems.
Typical Applications
- Residual current and earth leakage monitoring systems.
- Industrial electrical distribution boards.
- Low-voltage switchboards and control panels.
- Large conductor and multi-cable installations.
- Machinery and industrial electrical systems.
- Commercial and infrastructure electrical distribution.
