RCT Series - Industrial Coils

Rogowski Industrial Coils RCT Series (PEM UK)

Overview and General Applications

The RCT series are industrial current sensors based on Rogowski coil technology, designed for permanent or semi-permanent installation in AC systems. They serve as an alternative to traditional current transformers (CT), offering light weight, flexibility, and a wide measurement range. The RCT measurement range extends from several hundred amperes up to 50 kA, depending on the model.

Key Features and Benefits

• Measurement stability and accuracy – typical accuracy better than 1% across the full rated range, with low phase shift (often below 1° at 50/60 Hz)
• Variety of outputs – available in industrial standards: 0–5 V AC, 0–1 A AC, 4–20 mA DC
• Modular design – electronics module can be DIN rail or panel mounted, with the Rogowski coil as a separate sensing element.
• Wide frequency spectrum – depending on model, bandwidth up to several hundred kHz (e.g., for RCTi version)
• Safe and lightweight construction – no magnetic core eliminates saturation risk; flexible and lightweight design allows installation in tight or hard-to-reach spaces.
• No saturation risk and high insulation strength – a typical advantage of Rogowski coils, especially under high current or transient conditions.

Versions and Variants

• RCTi: single-channel sensor with wide bandwidth (e.g., 1 MHz) – for dynamic measurements.
• RCTi-3ph: three-phase version with three coils in one housing.
• RCTrms: RMS output version – ideal for power network measurements.
• RCTrms-3ph: three-phase RMS version.
• RCT1A: version with 0–1 A AC output, typically with lower bandwidth (up to 5 kHz).

Practical Applications of Rogowski Coils

• Monitoring in power installations – phase current measurement, load balancing, network diagnostics.
• Industrial automation systems – current measurement in busbars, power and supply circuits, overload monitoring.
• Integration with SCADA or PLC systems via standard output signals.
• Applications where traditional current transformers cannot fit or lack sufficient range or linearity.