RBLCT12 | 17,5 | 24 Support-Type current transformers narrow design according to DIN 42600, part 8. Block-Type CT; The current transformers of the new RITZ-RBLCT 12...24 have been specially developed for use in the switchgear and power supply market. They can be used for measuring and protection purposes with a rated current of max. 1500 A, Ith.: 100 x In, max. 25 kA/1 sec. in the voltage series 12, 17.5 and 24 kV.