Applications
3.3 Transfer control
3WA1 air circuit breaker
206 Equipment Manual, 02/2023, 92310000002-06
3.3 Transfer control
3.3.1 General
3KC ATC transfer control devices and 3WA circuit breakers with a spring charging motor
can be used to implement transfer control between a main source and an alternative
power source. The stability of the power supply is analyzed by means of voltage taps
upstream of the switching devices in this case. User-defined limiting values (voltage,
frequency, phase sequence) function as boundary conditions for analyzing the quality of
the power supply. If a limiting value is undershot or exceeded for a specific defined time,
the 3KC ATC transfer control devices initiate a transfer to an alternative power source.
The following 3KC ATC transfer control devices can be used with 3WA circuit breakers:
The 3WA circuit breakers require the following accessories for transfer control in
conjunction with the transfer control devices:
• Auxiliary switch for electrical interlocking
• Auxiliary switch for status signaling
• Trip alarm switch
• Shunt trip
• Closing coil
• Spring charging motor
• Mechanical interlocking (Bowden cable interlock module, optional)
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