Compact Busbar/Base Mounting Current Transformers- Series 17. A range of compact, moulded case current transformers suitable for primary currents from 250A to 1250A with built-in sealable terminal covers. The current transformers are used to transform various primary currents into 5A or 1A standard secondary using up to 50 x 10 mm or 40 x 30 mm busbars. Alternatively you can use cables up to 40 mm diameter. Built-in sealable terminal covers Mounting feet supplied Narrow width- 70 mm Wide range of primary current Rated system voltage 0.72/3kV Continuous current 1.2 x rated current Conforms to IEC185, BS 7626, BSEN 60044-1and IEC 60044-1