Why Choose the ABB TR3 Toroidal Transformer?
The ABB TR3 is a reliable toroidal current transformer for residual current monitoring designed for use with compatible ABB earth leakage relays and residual current monitors. As part of ABB’s Earth Monitoring Devices range, it provides the external current-sensing element required to detect leakage currents in commercial and industrial electrical installations.
The TR3 features a closed 80 mm internal diameter, allowing the protected circuit conductors to pass through the transformer aperture. It is designed for use with compatible ABB RD and ELR residual current monitoring relays, enabling the relay to monitor residual current and initiate the appropriate alarm or trip response according to the relay configuration.
With compact dimensions of approximately 160 × 150 × 50 mm and a through-feed current converter design, the TR3 provides a practical sensing solution for electrical panels and distribution systems. Its 80 mm aperture makes it suitable for installations requiring more conductor space than smaller TR-series toroidal transformers while retaining a closed-core construction.
Key Advantages
- Reliable toroidal current transformer for residual current monitoring.
- 80 mm internal diameter accommodates multiple or larger circuit conductors.
- Designed for use with compatible ABB RD and ELR residual current relays.
- Closed-core, non-openable construction for permanent installations.
- Screw-connected secondary output for secure electrical termination.
- Suitable for commercial and industrial earth leakage monitoring systems.
Key Features
- ABB TR series toroidal transformer.
- 80 mm internal aperture diameter.
- Through-feed current converter design.
- Closed, non-openable transformer construction.
- Screw connection for the secondary output.
- FS 5 current limit function.
- One primary input through the toroidal aperture.
- Designed for compatible ABB residual current monitoring relays.
- RoHS compliant according to EU Directive 2011/65/EU.
Reliable Residual Current Monitoring
Toroidal transformers such as the ABB TR3 operate as the sensing element within an earth leakage monitoring system. The live conductors of the protected circuit pass through the transformer aperture and, under normal conditions, their currents balance. An earth leakage fault creates a residual current imbalance that can be detected by the connected monitoring relay.
The ABB TR series is designed for use with compatible residual current relays including ABB RD and ELR devices. The TR3’s 80 mm internal diameter provides useful installation capacity for larger conductors or groups of conductors, while its closed-core construction makes it well suited to new panel builds and installations where conductors can be routed through the transformer during assembly.
Typical Applications
- Industrial earth leakage monitoring systems.
- Commercial electrical distribution boards.
- Electrical switchboards and control panels.
- Residual current monitoring with compatible ABB RD relays.
- Residual current monitoring with compatible ABB ELR relays.
- Three-phase and other circuits requiring external toroidal residual current sensing.
