Why Choose the ABB TR6 Toroidal Transformer?
The ABB TR6 is a large-aperture closed-core toroidal transformer designed for residual current and earth leakage monitoring in low-voltage electrical installations. As part of the ABB TR toroidal transformer range, it works with compatible ABB residual current relays to detect leakage currents and support reliable earth fault monitoring and protection in industrial and commercial distribution systems.
The TR6 provides a substantial 300 mm internal diameter, making it particularly suitable for installations containing large conductors, multiple cables or busbar arrangements. Its closed-core construction provides a permanent sensing arrangement for new installations where the monitored conductors can be routed through the transformer aperture during assembly.
Designed for residual current measurement, the TR6 features a 500/1 transformation ratio, 500 mA minimum measurable current and IP20 protection. It can be installed in any position and is designed for operation across a temperature range of -10 to +70 °C, supporting dependable use in electrical switchboards and distribution equipment.
Key Advantages
- Large-aperture toroidal transformer for residual current monitoring.
- 300 mm internal diameter accommodates large conductors and cable groups.
- Closed-core construction for permanent electrical installations.
- Designed for use with compatible ABB residual current relays.
- 500/1 transformation ratio for residual current measurement.
- 500 mA minimum measurable current.
- Can be installed in any mounting position.
- Supports earth leakage monitoring in industrial and commercial distribution systems.
Key Features
- ABB TR series toroidal transformer.
- 300 mm internal aperture diameter.
- Closed, non-openable core construction.
- 500/1 transformation ratio.
- 500 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 degree.
- Operating temperature range of -10 to +70 °C.
- Storage temperature range of -20 to +80 °C.
- Screw terminal connections accepting conductors up to 2.5 mm².
Reliable Residual Current Detection
Toroidal transformers operate with residual current monitoring relays by sensing the vector sum of the currents flowing through the active conductors passing through their aperture. Under normal conditions these currents balance, while leakage to earth creates a residual current that can be detected by the transformer and communicated to the connected protection relay.
The ABB TR6 is particularly suited to applications requiring an exceptionally large conductor aperture. When combined with a compatible ABB residual current relay, it forms part of a configurable earth leakage monitoring and protection system for large low-voltage distribution circuits.
Typical Applications
- Residual current and earth leakage monitoring systems.
- Industrial switchboards and electrical distribution panels.
- Large low-voltage distribution circuits.
- Commercial and industrial electrical installations.
- Large cable bundles and multi-conductor arrangements.
- Busbar and high-capacity distribution installations.
- Electrical protection systems using compatible ABB residual current relays.
