1SAJ929501R0850 ABB CT5L850R/4 3-Phase Current Transformer 400–850 A

Why Choose the ABB CT5L850R/4 3-Phase Current Transformer?

The ABB CT5L850R/4, order code 1SAJ929501R0850, is a three-phase current transformer designed for high-current motor monitoring applications with the ABB UMC100.3 Universal Motor Controller. It extends the current measurement capability of the motor management system, allowing the UMC100.3 to be applied to larger industrial motors with nominal currents above its direct measurement range.

As part of ABB's CT4L/CT5L current transformer range, the CT5L850R/4 features linear current transformer characteristics and is purpose-designed for integration with ABB motor management equipment. The three motor phase conductors pass through the transformer, enabling all three phase currents to be transformed for measurement by the connected UMC100.3.

The CT5L850R/4 supports a rated primary current range of 400–850 A AC and has a transformation ratio of 212.5:1, corresponding to 850 A primary / 4 A secondary at the upper rating. This makes it the highest-current model in the CT4L/CT5L family and suitable for demanding high-power motor control installations.

Key Advantages

• Purpose-built three-phase current transformer for ABB UMC motor management systems.
• 400–850 A AC rated primary current range for high-current motors.
• 850 A / 4 A transformation at the upper current rating.
• 212.5:1 transformer ratio for accurate current scaling.
• Linear current transformer characteristics support reliable motor current measurement.
• Allows UMC100.3 controllers to monitor motors with nominal currents above 63 A.

Key Features

• ABB CT5L850R/4 three-phase current transformer.
• ABB order code 1SAJ929501R0850.
• 400–850 A AC rated primary current range.
• 850 A primary / 4 A secondary current.
• 212.5:1 current transformation ratio.
• Designed for use with ABB UMC100.3.
• Suitable for motor currents greater than 63 A.
• Three-phase design monitors all three motor phases.
• Linear current transformer characteristics.
• UMC100.3 combinations support industrial approvals including ABS, ATEX, CCC, cULus and DNV-GL.

High-Current Measurement for UMC100.3 Motor Management

The ABB UMC100.3 Universal Motor Controller provides motor protection, control, diagnostics and communication functions. For motors whose operating currents exceed the controller's direct current measurement range, an external current transformer is used to scale the three phase currents to levels suitable for measurement by the motor controller.

The CT5L850R/4 fulfils this role for high-current applications, covering primary currents up to 850 A AC. Its three-phase construction and linear characteristics make it suitable for motor control centres, process plants and other installations where dependable current information is required for motor protection and monitoring.

Typical Applications

• ABB UMC100.3 Universal Motor Controller systems.
• High-current three-phase industrial motors.
• Motor control centres and switchgear assemblies.
• Pumps, fans and compressor motor systems.
• Conveyors and heavy industrial machinery.
• Process plant motor protection and monitoring.