Residual Current Monitors with Remote Output

Residual Current Monitors with remote output replicating the system residual current < 300 mA. The alarm output contact operates at a fixed value of 300 mA.

  • RCMs provide residual current monitoring, they do not provide residual current protection.
  • The DCTR B NK is designed for use in installations under the permanent supervision of an "instructed person". This person is responsible for initiating the appropriate action, in the event of the 300 mA fixed threshold being exceeded.

Technical data

Ordering reference: see below:

RCM Residual current monitor - Type NK
Control supply 24v DC
   Monitoring: Voltage < 690V   0 < 400 Hz
       Internal 	           Contact	          Fixed	            Reference 
    Diam.  in mm	    C/O		  Range	
         20		       1	        0.3A	       DCTR B NK 020/0.30-I
         35		       1	        0.3A	       DCTR B NK 035/0.30-I
         70		       1	        0.3A	       DCTR B NK 070/0.30-I

Operating Instructions

Product Standard: EN62020
Approvals: VDE

Residual Current Monitors with Modbus TCP output for use in conjunction with our free DCTR Manager software.

  • The software provides an overview of all transformers in the network, enabling real-time evaluation of system PE currents and residual currents.
  • The software offers a wide range of features including RCM addressing, setting, date stamped reporting, email notification of alarm threshold breaches - for further information refer to the DCTR Manager user guide - see below.
  • The DCTR B-X Hz-PoE residual current monitor is designed for use on a PC and Server which is running permanently, in installations under the permanent supervision of an "instructed person". This person is responsible for initiating the appropriate action, in the event of the alarm threshold being exceeded.

Technical data

Ordering reference: see below:


RCM Residual current monitor - Type B-X Hz
Control supply PoE
   Monitoring: Voltage < 690V   0 < 400 Hz
       Internal 	         Contact	          Adjustable	              Reference 
    Diam.  in mm	  C/O		  Range	
         35		       2	     0.3 < 30A	     DCTR B-X Hz 035-PoE
         70		       2	     0.3 < 30A	     DCTR B-X Hz 070-PoE


Product Standard: EN62020
Approvals: VDE