The working principle of the isolation monitor for IT systems in medical use rooms, as well as hospital and ambulatory clinic, is based on applying a dc voltage or a codified signal, between the secondary of the isolation transformer and the equipotential node of the installation . Borna niroo karan company(Bornika) is the exclusive representative of Contrel on buying , selling, consulting services for automation systems and protective relays including Insulation monitoring Relais.
Isolation Relay RI-R48 allow the insulation monitoring to earth of electric networks in alternate and direct current till 48 V isolated (IT systems) . Devices have on frontal panel signal for activity ON, for tripping TRIP (low insulation), a test bottom, a reset bottom and a potentiometer (or micro switches) for setting the threshold of tripping (only for versions with adjustable threshold).
Isolation Relay RI-F22/RI-R35 allow insulation monitoring on earth of electric networks in alternating 230 V and isolated 400 V (IT systems). Insulation resistance monitoring is carried out applying a measure’s signalling in direct-current between isolated network and earth.
Panels of remote signalling PR allow to give alarm signalling of insulation's monitoring devices HRI . They have also an acoustic signaller incorporated, a test button and a button for stopping acoustic signal . Maximum of repeater boards associable with HRI device is 2 .