• As an alternative to the insulation test by means of periodic verification. For MRCD applications in combination with a circuit breaker
• Alternating, pulsating or AC/DC sensitive measurements can optionally be carried out by selecting the measuring current transformer for each channel
• Device version RCMS490 with one alarm contact per channel
• Analysis of the harmonics, DC, THF
• Adjustable frequency response for protection of persons, fire protection, plant protection

The RCMS system consists of one or more RCMS460-D/-L or RCMS490-D/-L residual current monitors, which are able to detect and evaluate fault, residual and operating currents in earthed power supplies via the related measuring current transformers. The maximum voltage of the system to be monitored depends on the nominal insulation voltage of the measuring current transformer used in the case of busbar systems, resp. depend on the cables or conductors that are routed through.

Closed CTBS25 or CTUB100 series measuring current transformers are required to measure AC/DC sensitive residual currents (according to IEC/TR 60755: Type B). They require one 24 V DC power supply unit (e.g. STEP-PS series). CTAC… (closed), WR (rectangular), WS (split-core) and WF… (flexible) series measuring current transformers are used for alternating and pulsating currents (according to IEC/TR 60755: Type A).

Type : residual current
Other characteristics : continuous, digital, multi-channel