TVR Instruments Measuring Power Protection LVD Distribution & Panel Building




Tel: 01206 575755

LinkedIn  FSB Membership TVR Shop UK GEN-SET & CHP Association

Core balanced & split core balanced CTs for use with Frer earth Leakage relays

Dependent on the current level of the network to be monitored it is necessary to use a CBCT that can give the correct mA output for the primary current. This is defined by the turns ratio and the size of the cable. Please refer to the table below that shows the primary current in ratio to the sensitivity level for the output to the tripping device. This is for use with Frer earth leakage relays only.


Online shop - Closed Core & Split Core Balanced CTs

CTs for use with Frer ELRs

Frer - Product Ranges & Anniversary Video


  TVR Instruments Limited, 143 Butt Road, Colchester CO3 3DP, Essex, United Kingdom - Tel: +44 (0)1206 575755 - Email /
Company Registration No. 7850289 © TVR Instruments Limited 2011 - Subscribe to TVR Newsletters/Product Updates
/ Terms & Conditions
return to top of page