Why Choose the ABB CT1M-S-30 250 Current Transformer?
The ABB CT1M-S-30 250 is a 250/5 A current transformer designed for indirect measurement of electrical parameters in low-voltage distribution systems. Supplied under ABB order code 2CSG280745R1000, it forms part of the ABB CT1M-S-30 series and is designed in accordance with IEC 61869-2.
With a rated primary current of 250 A and a rated secondary current of 5 A, the CT1M-S-30 250 converts primary circuit current into a proportional standard secondary signal for compatible electricity meters, ammeters, power analysers and monitoring equipment. It provides class 1 accuracy with a 3.75 VA rated output and a 6.25 VA rated output at class 3.
The CT1M-S-30 250 features a split-core design that simplifies installation around existing conductors without requiring the primary conductor to be disconnected. Its compact 106 × 93 × 40 mm dimensions, IP20 degree of protection and 50–60 Hz rated frequency make it a practical solution for switchboards, distribution panels, retrofit projects and energy monitoring installations.
Key Advantages
- Reliable 250/5 A current transformation for indirect electrical measurement.
- Split-core construction simplifies installation and retrofit applications.
- Class 1 accuracy for metering and monitoring applications.
- 3.75 VA rated output at accuracy class 1.
- 6.25 VA rated output at accuracy class 3.
- Standard 5 A secondary output for compatible measuring equipment.
- FS 10 instrument security factor.
- Compact 106 × 93 × 40 mm dimensions for panel installations.
- IP20 degree of protection for installation within suitable electrical enclosures.
- Designed in accordance with IEC 61869-2 for instrument current transformers.
Key Features
- ABB CT1M-S-30 split-core current transformer.
- 250 A rated primary current.
- 5 A rated secondary current.
- 250/5 A transformation ratio.
- Class 1 best accuracy class.
- 3.75 VA rated output at class 1.
- 6.25 VA rated output at class 3.
- FS 10 instrument security factor.
- 50–60 Hz rated frequency.
- IP20 degree of protection.
- Primary opening suitable for conductors up to 33 × 23 mm.
Convenient Split-Core Current Measurement
Current transformers allow electricity meters and monitoring instruments to measure circuits carrying currents above their direct-input range. The ABB CT1M-S-30 250 transforms a primary current of 250 A into a proportional 5 A secondary current, providing a standard signal for compatible measuring equipment.
The split-core construction is particularly useful for retrofit projects because the transformer can be installed around an existing conductor without disconnecting the primary circuit conductor. Combined with its class 1 measurement performance and compact dimensions, the CT1M-S-30 250 is well suited to upgrading existing switchboards with energy metering and electrical monitoring equipment.
Typical Applications
- Electrical energy metering systems.
- Retrofit energy monitoring projects.
- Low-voltage distribution switchboards.
- Commercial electrical distribution panels.
- Industrial power monitoring systems.
- Building energy management installations.
- Panel-mounted ammeters and power analysers.
- Indirect measurement of 250 A electrical circuits.
