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Applications
3.4 400 Hz network applications of 3VA molded case circuit breakers
Note
DC 2-pole (all-pole disconnection), non-grounded system
If there is no possibility of a double ground fault occurring, or if any ground fault that does
occur is dealt with immediately (ground-fault monitoring), 500 V will be the maximum
permissible direct voltage. In a non-grounded system, all poles must be disconnected.
Further circuits are available on request.
3.4
400 Hz network applications of 3VA molded case circuit breakers
400 Hz networks are used for:
● Ground power supply systems for aircraft
● On-board electrical systems of marine craft and aircraft
● Other external stations of airports which are protected by uninterruptible power supplies,
e.g. radar installations, data processing equipment, communication systems
It is important to supply the on-board electrical systems of aircraft with a very smooth DC
voltage. This can be generated more easily by 400 Hz power supplies than by 50 Hz
networks. Moreover, the power transmitters (transformers) are smaller and lighter by
comparison with 50 Hz networks, two important arguments for using 400 Hz on-board
electrical systems in aircraft and some marine craft.
Suitable 3VA molded case circuit breakers and trip units
3VA molded case circuit breakers equipped with 2-series thermal-magnetic trip units are
suitable for use in 400 Hz networks.
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3VA molded case circuit breakers
Manual, 04/2015, A5E03603177010-02
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