Siemens SIPROTEC 7SS523 V3.2 Manual page 334

Technical Data
9.2.19 MCBs for Device 7SS52x
318
The miniature circuit breaker have one tripping characteristic for thermal overload as
well as one for short circuits ( for magnetic trip actuator).
For the dimensioning of overload, the continuous as well as momentary current has to
be taken into consideration.
For magnetic trip actuator, please observe the transitory current ratio. The limitation
of the transitory current ratio correspond to the following requirements
• max. 18A peak value for a period of time of < 0,25 ms
• max. 12A peak value for a period of time of < 1 ms
7SS52 V4 Manual
C53000-G1176-C182-1