Integration in power distribution equipment
7.4 Requirement according to IEC 61439
3WA1 air circuit breaker
530 Equipment Manual, 02/2023, 92310000002-06
Two-step retrofit
The retrofit combines extremely easy integration of the 3WA circuit breakers into the
power distribution equipment with short downtime and high system availability. The
retrofit only requires two steps:
1. Remove the 3WL circuit breaker and 3WL guide frame from the existing power
distribution equipment.
2. Install the 3WA circuit breaker and 3WA guide frame in the existing power distribution
equipment.
Important information about replacing the 3WL with a 3WA
Secondary disconnect terminal wiring
The use of new functions (e.g. DAS+ Dynamic Arc-Flash Sentry) changes the
assignment of the secondary disconnect terminals for the 3WA circuit breaker compared
with the 3WL circuit breaker.
No rewiring is required in the power distribution equipment for electrical accessories
which are positioned at secondary disconnect terminal blocks X5 and X6 of the circuit
breaker. Rewiring is necessary when installing accessories positioned at secondary
disconnect terminal blocks X7 and X8.
Secondary disconnect terminal block X8
Secondary disconnect terminal block X7
Secondary disconnect terminal block X6
Secondary disconnect terminal block X5
The wiring for the following electrical accessory components remains the same
(connection via secondary disconnect terminal blocks X5 and X6):
• Spring charging motor
• Closing coil
• First auxiliary release
• Second auxiliary release
• Ready-to-close signaling switch
• Auxiliary contacts for switch position
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