Miniature 3 Phase Current Transformers- CT140 Series. A range of miniature 3 phase current transformers suitable for primary ranges from 250A to 630A with 5A secondary. The CT140 series are supplied with terminal covers and a choice of fixings. Foot mounting For installation onto cables or 31 mm max. busbars 140 mm width allows direct installation on top of moulded case circuit breakers Continuous current- 1.2 x rated current Insulation level 3 kV for 1 min Conforms to IEC185, BS 7626, BSEN 60044-1and IEC 60044-1