BZCT160 Circular Toroid


A Core Balance Current Transformer (CBCT) / Toroid designed for use in conjunction with all Broyce “Type A” Earth Leakage Relays that require an external sensing means. Designed to detect leakage current and transmit a proportional signal to an Earth Leakage Relay.



● Aperture diameter: 160mm.
● Rated system voltage: 720VAC.
● Insulation level: 3kVAC.
● Current ratio: 1/1000.
● Rated operational current (I.e.): 320A (400mm2)
● Max. cross-section/phase cable size shown in brackets and assumes 3P + N copper cables.
● Max. permissible current: 1kA cont., 5kA for 1.5s, 100kA for 0.05s.
● Min. I∆n setting on Earth Leakage Relay foreach type of toroid: 0.3A.
● Max. Distance: 50m (max.) between toroid and ELR.
● Ambient temperature: -20 to +60°C.
● Relative humidity: +95%.
● Housing: Grey ABS.
● Mounting option: Surface mount with 4 fixing slots. Supplied with separate mounting feet.
● Terminal conductor size: ≤ 2.5mm2 solid / ≤ 1.5mm2 stranded.
● Dimensions (inc. feet): W:150 x H:253 x D:60 mm.
● Weight: 1075g.
● Approvals: CE Compliant.
● Conforms to IEC61869 parts 1 and 2.