Three-phase non-contact, true rms, current transducer

Powered from a 12V-24V supply, it features a thin, clip-around, flexible sensor coil and provides accurate true rms measurement with 4-20mA or 0-5V output, enabling simple installation with PLCs, SCADA systems or other automation equipment.

The compact, DIN-rail or panel mountable RCTrms-3ph extends the design of PEM’s proven RCTrms single-phase transducer, connecting to three Rogowski coils to capture measurements from three current phases simultaneously. This significantly reduces cost per channel, while enabling safe and fast installation.

With 18 current rating options from 100A to 50,000A, and a choice of 300mm, 500mm, 700mm or custom coil lengths, the RCTrms-3ph can be used in a very wide range of applications. The clip-around coil design allows fast and easy positioning, and provides accurate results without needing to be centralised around the conductor. An isolated BNC-BNC cable-split option is available, to ease installation such as when threading through existing conduit.

The RCTrms-3ph uses non-magnetic materials, which ensures good linearity and prevents damage from over currents. Typical accuracy is better than 1 percent of reading from 10 to 100 percent full scale. The units are safe, with 2kVdc power-supply isolation and 2kVpeak coil rating, and are CE marked and compliant with EMC EN 61326-1 2006 and IEC61010-1:2001.