This European Standard specifies the characteristics of three -pole circuit breakers, temperature compensated with a rated current from 20 A to 50 A, used in aircraft on -board circuits at a temperature between – 55 °C and 90 °C at an altitude of 15 000 m max.

These circuit breakers are operated by a push -pull type single pushbutton (actuator), with delayed action "trip-free" tripping

They will continue to function up to the short-circuit current.