Danisense, a leader in high-accuracy current transducers for demanding applications, has launched its highly versatile series RCMH070IB+ Residual Current Monitor (RCM). Suitable for monitoring the residual currents in electrical power systems without the need for fast system shutdown, the Type B/B+ RCM can measure DC and AC residual currents from 30 mA to 2 A Irms at frequencies of up to 100 kHz, suiting it to a wide range of industrial applications, loads and generation sources. Significantly, the new RCM is compliant with the updated norm IEC62020-1. This means that it can be used for remote monitoring without the need to perform periodic onsite checks.

Featuring a 70 mm primary cable/busbar aperture and user-selectable settings for frequency range, integration time, and rated residual operating current, the RCMH070IB+ RCM product also features an analog 4mA to 20 mA output. This represents the real-time True RMS value of the measured residual current for interfacing to, for example, a PLC. Additionally, a free potential relay output (NO / NC) with a user-selectable rated residual current limit can be used to provide a warning or even system shutdown if the True RMS residual current measurement exceeds the preset value. An LED provides a visual indication of the status of the relay output. Built-in test and external test controls are provided for regular testing of the RCM. The RCMH070IB+ requires only a single 24 Vdc power supply.

“These new RCMs use our Fluxgate current measurement technology with fixed excitation frequency to provide enhanced accuracy and stability. Applications include condition-based monitoring of insulation health; high voltage insulation testing; mission-critical installations in data centers and medical facilities; DC power systems and high-frequency loads,” comments Loic Moreau, VP of marketing at Danisense.