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The FFTK (33595) can be used to test the STR range of trip units like :
STR22ME, STR22GE, STR22SE,
STR23SE, STR23SP, STR43ME, STR53UP, STR53UE,.
The old and obsolete range of STR cannot be tested by using 33595 as the kit used to test these old trip units was different (i.e. 34547). Also the type of trip units to be tested should be equipped with the featuresfor example
STR08 is fitted on a switch-disconnector NI and HI type.
STR08 has no electronic relay inside, it is a dummy unit.
STR18I is a trip unit fitted on HF type , which has a instantaneous protection only during the closing operation. Then , when the breaker is closed, there is no longer protection