AZU-400A

Role in the aircraft electrical system

The unit belongs to the class of apparatus that combines high-current switching control with monitoring and protective functions in an aircraft generating channel. Available public material confirms the product name and its placement within aircraft power-system protection studies; it does not provide a complete controlled specification suitable for installation release.

It shows a metal enclosure, heavy power terminals, a control connector, mounting feet and a blank nameplate. Match the delivered item by its original plate, connector keying, terminal plan and drawing. Related versions: AZSGK-5A and AZZ-3.

Data required before installation

Confirm the main-circuit current class, DC system voltage, contact configuration, generator-channel function, control-supply pins, protection pickup values, time delays, reset logic and permissible duty from the applicable passport. The number and polarity of control circuits must match the approved aircraft diagram. Do not infer interchangeability from a similar metal enclosure or the 400 A designation alone.

Bench verification requires an approved test scheme, isolated current and voltage sources, calibrated measurement channels and safe handling of the high-current path. Record pickup and release values, contact state, control response, insulation condition and connector pin identification.

Inspection and inquiry

Inspect the enclosure, cover fasteners, mounting points, power studs, connector, insulators, seals and nameplate for cracking, overheating, corrosion, looseness or unspecified repair. Wikipedia provides general context on electrical protection devices. Browse Aviamisto’s Circuit Breakers category. State AZU-400A / АЗУ-400А, nameplate data, quantity and required documentation in the inquiry.