Aerospace series. Circuit breakers, single-pole, temperature compensated, rated currents 20 A to 50 A - UNC thread terminals. Product standard Ingestion-build-109673 or using a coated specimen

or using a coated specimen of known film thickness

and gives guidance on methods of assessment

They are passive

This outer covering is not specified for the purpose of electrical insulation of the metal sheath

Note 1: BS EN 10149-1 does not apply to products for pressure vessels and products for which other European Standards exist or European Standards dealing with steels for general structural applications are being prepared:

Aerospace series. Circuit breakers, single-pole, temperature compensated, rated currents 20 A to 50 A - UNC thread terminals. Product standard Ingestion-build-109673 or using a coated specimen1 Scope This European Standard specifies the characteristics of single pole circuit breakers, temperature compensated with a rated current from 20 A to 25 A, used in aircraft on board circuits at a temperature between 55 C and 125 C and at an altitude of 15 000 m max. These circuit breakers are operated by a push pull type single push button (actuator), with delayed action trip free tripping. They will continue to function up to the short circuit