Description
2.1 Overview - applications and portfolio
3WA Air Circuit Breakers
Equipment Manual, 05/2021, 92310000002-03
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• Accessories are designed for the maximum service life of the circuit breaker.
• Support by CAx files, EPLAN macros and Siemens tools simplifies planning and integration
of the circuit breaker into the overall installation.
2.1.2 Portfolio of the 3WA1 circuit breaker
The 3WA1 series comprises the circuit breakers
• 3WA11: Size 1
• 3WA12: Size 2
• 3WA13: Size 3
The series covers breaking capacities up to 150 kA at 500 V AC.
2.1.3 Advantages
• High modularity
In order to adapt the circuit breaker to new and changing requirements, components such
as auxiliary releases, spring charging motors, overcurrent releases, external current
sensors, auxiliary circuit signaling switches, automatic reset devices, and interlocks can be
retrofit or replaced.
• Quick function extension
The protective functions of the ETU600 electronic trip unit can be quickly adapted to the
requirements of the installation site:
– Ground-fault protection can be added by simply exchanging the option plug (LSIG
version).
– Protection and alarm functions, but also graded metering functions, can be added via
digital function packages.
• Flexible communication/metering function
The communication module of the 3WA circuit breaker offers the PROFINET IO and
Modbus TCP communication protocols, which can be used simultaneously. Furthermore,
two communication modules with the same or different protocols can be operated
independently of each other on a circuit breaker, for example in a redundancy system. The
retrofittable modules can be mounted directly on the circuit breaker to save space or
flexibly and externally on a DIN rail. The communication modules are updatable, they
provide security functions to protect against unauthorized access.
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