The standard specifies the required characteristics for three-pole temperature compensated circuit breakers of current ratings from 0,5 to 25A. These circuit breakers are operated by a single push-pull button with trip-free release, delayed tripping and are explosion proof. Their operation is ensured up to short circuit current. Their temperature range lies between -55 oC and 125 oC for In > 15 A and between -55 oC and 90 oC for In > 15 A at an altitude Z = 22 000 m max.