Circuit Breakers

Aircraft circuit breakers and electrical protection devices are arranged for selection by exact designation, current rating and execution. The category contains numerous closely related models, making the complete marking essential. It supports technical comparison while keeping every protective device tied to its own product record and aircraft documentation.

Breaker families and rated-current variants

AZK and AZK1M families appear alongside A-series positions, AOF-designated devices and other recorded protection units. Many families include several ratings or suffixes under a similar housing style. Neighbouring values are separate products; a higher or lower rating must never be treated as an automatic replacement.

Protection characteristics belong to the circuit design

Selection can involve rated current, pole configuration, mounting, terminal arrangement, trip behaviour and environmental execution. Only documented values should be used. Match the full label with the wiring diagram, equipment specification and aircraft parts documentation before approving a breaker for a particular circuit.

• record the full model and current marking;
• retain every suffix and execution code;
• identify the protected circuit when known;
• provide mounting or terminal information;
• state quantity and documentation requirements.

Find the exact protection-device record

The selected card can be used to request confirmation of designation, available condition, completeness, documents, price and lead time. Associated switching assemblies are indexed under Relays and Contactors. Browse the main aircraft parts catalogue for other electrical-system groups.