Why Choose the ABB TRM Toroidal Transformer?
The ABB TRM is a compact modular toroidal transformer designed for residual current and earth leakage monitoring in low-voltage electrical installations. As part of the ABB TR toroidal transformer series, it works with compatible ABB residual current relays and monitors to detect current imbalance in the active conductors passing through the transformer.
With a 29 mm internal diameter and closed-core construction, the TRM provides a compact sensing solution for conductors installed in distribution boards, switchboards and control panels. Its modular format is particularly well suited to installations where space is limited while dependable residual current sensing is required.
The TRM provides a 30 mA minimum measurable current, 500/1 transformation ratio and IP20 protection. It is designed for use with compatible ABB residual current monitoring equipment, including RD2/RD3 and ELR devices, providing a reliable interface between the monitored conductors and the associated protection relay.
Key Advantages
- Compact modular toroidal transformer for residual current monitoring.
- 29 mm internal diameter for conductors in compact electrical assemblies.
- Closed-core construction provides dependable residual current sensing.
- 30 mA minimum measurable current supports sensitive earth leakage monitoring.
- 500/1 transformation ratio for compatible residual current monitoring equipment.
- Designed for use with compatible ABB RD and ELR residual current devices.
- IP20 protection rating for installation inside suitable electrical enclosures.
Key Features
- ABB TR series modular toroidal transformer.
- 29 mm internal diameter.
- Closed-core construction.
- 30 mA minimum measurable current.
- 500/1 transformation ratio.
- 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.
- -10 to +70 °C operating temperature.
- IP20 protection degree.
Reliable Residual Current Monitoring
Toroidal transformers monitor the vector sum of the currents flowing through the active conductors of an electrical circuit. Under normal operating conditions these currents balance each other, while leakage to earth creates an imbalance that produces a measurement signal for the connected residual current relay or monitor.
The ABB TRM combines a compact modular format with a 29 mm closed-core aperture and sensitive residual current measurement capability. When paired with compatible ABB residual current monitoring equipment, it provides dependable earth leakage sensing for industrial and commercial electrical distribution systems.
Typical Applications
- Residual current and earth leakage monitoring systems.
- Low-voltage electrical distribution boards.
- Industrial switchboards and control panels.
- Machinery electrical protection systems.
- Commercial building electrical distribution.
- Installations using compatible ABB RD or ELR residual current devices.
