The ABB TR1 (2CSG035100R1211) is a compact and reliable toroidal current transformer designed for use with residual current monitoring systems. As part of the ABB range of residual current monitors and external transformers, the TR1 provides accurate leakage current detection for industrial and commercial electrical installations.
This through-feed current converter is designed to work with ABB residual current monitoring devices, allowing leakage currents to be detected and monitored within electrical systems. The transformer features a closed, non-openable design with screw connection terminals for dependable installation.
With a compact toroidal construction, a 35 mm internal diameter and a 60 mm bore diameter, the ABB TR1 is suitable for applications where accurate residual current measurement and space-efficient installation are required.
Key Advantages
ABB TR1 toroidal transformer designed for residual current monitoring applications.
Accurate leakage current detection when used with compatible ABB RCM systems.
35 mm internal diameter suitable for compact electrical installations.
Non-openable construction for reliable long-term operation.
Toroidal transformers such as the ABB TR1 detect leakage currents by measuring the imbalance between conductors passing through the transformer core. When combined with compatible residual current monitoring relays, they provide an effective method for monitoring electrical insulation conditions and improving system safety.
The ABB TR series is designed for engineers and installers requiring accurate current measurement, compact dimensions and dependable integration into low-voltage electrical systems.
Typical Applications
Residual current monitoring systems.
Industrial electrical panels.
Low-voltage distribution systems.
Machine safety and protection monitoring.
Building electrical installations.
Control cabinets and modular DIN rail systems.
Technical Specifications
HS Code
85043121
Country of Manufacture
Italy
Manufacturer
ABB
Series
TR
Model
TR1
Product ID
2CSG035100R1211
Product type
Toroidal current transformer
Application
Residual current monitoring
Transformer type
Through-feed current converter
Number of primary inputs
1
Secondary connection
Screw connection
Design
Not openable
Current limit function
FS 5
Inside diameter
35 mm
Bore diameter
60 mm
Dimensions (W × H × D)
100 × 110 × 50 mm
Weight
approx. 0.2 kg
Protection rating
IP20
Compliance
RoHS compliant
Frequently Asked Questions
What is the ABB TR1 2CSG035100R1211 used for?
The ABB TR1 is used as an external toroidal transformer for residual current monitoring systems to detect leakage currents.
What type of transformer is the TR1?
The TR1 is a through-feed current converter with a toroidal design for residual current measurement applications.
What is the internal diameter of the ABB TR1?
The ABB TR1 has an internal diameter of 35 mm.
How is the secondary output connected?
The secondary output uses a screw connection for secure electrical installation.
Can the TR1 transformer be opened for installation?
No, the ABB TR1 uses a closed, non-openable construction designed for permanent installation.
Trusted by Electrical Monitoring Professionals
ABB residual current monitoring transformers are widely used by electrical engineers and system integrators to provide dependable leakage current detection and improved electrical system monitoring.
HS Code
85043121
Country of Manufacture
Italy
Manufacturer
ABB
Series
TR
Model
TR1
Product ID
2CSG035100R1211
Product type
Toroidal current transformer
Application
Residual current monitoring
Transformer type
Through-feed current converter
Number of primary inputs
1
Secondary connection
Screw connection
Design
Not openable
Current limit function
FS 5
Inside diameter
35 mm
Bore diameter
60 mm
Dimensions (W × H × D)
100 × 110 × 50 mm
Weight
approx. 0.2 kg
Protection rating
IP20
Compliance
RoHS compliant
No documents available for this product.
Delivery
We offer fast UK delivery on all stocked items. Orders placed before 3pm Monday to Friday are eligible for next-day delivery.
Standard delivery: 2–3 working days
Next-day delivery: available on in-stock items when ordered before 3pm
Express options available — contact us for details
Returns
If you need to return an item, please contact our sales team within 30 days of receipt. Items must be returned unused in their original packaging.
Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.
Priority sourcing and supply support
Flexible payment terms for qualifying organisations
Support for engineering, maintenance, and operations
500 +
Stock lines ready to ship
1,000 +
Same day dispatches
3500 +
Customers supported
28
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...