SENTRON Air Circuit Breakers

Advanced Protection for a Smarter, Safer Power System

SENTRON Air Circuit Breakers

Discover the Siemens SENTRON 3WA and 3WT Air Circuit Breakers—built for reliability, efficiency, and safety in modern power distribution. Engineered with advanced electronic trip units, modular design, and cutting-edge communication capabilities, these breakers ensure seamless integration into digital energy systems. With features like Dynamic Arc Sentry (DAS+) for enhanced personnel safety, compliance with IEC 61439, and flexible retrofit options, they deliver superior protection and operational continuity. Whether for industrial, commercial, or infrastructure applications, Siemens’ air circuit breakers set the standard for high-performance, future-ready power distribution.

Ease of Use

Ease of Use

Siemens air circuit breakers offer a modular design that allows seamless adaptation to various applications. With a wide selection of accessories and communication modules, they can be customised to meet specific system requirements. Their flexible installation options make them suitable for both new and existing electrical infrastructures, ensuring long-term scalability and ease of integration.

Energy Efficient

Energy Efficient

Built for demanding applications, Siemens air circuit breakers provide high breaking capacity and intelligent protection to safeguard electrical systems from faults. They ensure reliable operation even in extreme conditions, reducing the risk of downtime and equipment failure. With advanced safety features and robust construction, they deliver long-term reliability for critical power distribution networks.

Safety Integrated

Safety Integrated

Siemens air circuit breakers are designed for intuitive operation, with user-friendly interfaces and accessible controls. Their integrated communication capabilities enable real-time monitoring and diagnostics, simplifying maintenance. Quick installation and modular upgrades ensure effortless adaptability, while advanced protection functions support efficient system management, making them a reliable choice for modern electrical networks.

3WA Features

In order to adapt the circuit breaker to new and changing requirements, components such as auxiliary releases, motorised operating mechanisms, external current sensors, auxiliary circuit signalling switches, automatic reset devices, and interlocks can be retrofitted or replaced on site.

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.

The communications modules of the 3WA circuit breaker offer the PROFINET IO, Modbus TCP,and Modbus RTU communication protocols, which can be used simultaneously.

Furthermore, two communications 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 communications modules are updatable, they provide security functions to protect against unauthorized access.

  • Only inspection required
  • No relubrication of moving parts in the circuit breaker
  • Parts only need to be replaced during maintenance if this is deemed necessary based on the inspection results. Accessory components are designed for the maximum specified service life of the circuit breaker under normal operating conditions.
  • Inspection and maintenance work may be carried out by qualified personnel of the operator or by a contracted company.

The 3WA13 circuit breakers (size 3) are extremely compact:

  • 3-pole circuit breakers fit into an 800 mm wide control panel.
  • 4-pole circuit breakers can be installed in a 1000 mm wide control panel.

3WA System Overview

1
Accessories for the ETU600
2
Activatable digital function 2 packages for ETU600
3
Guide frame accessories
4
Interlocking system
5
Connection system guide frame
6
Position signaling switch (PSS) 6 for guide frame
7
Communication and connections
8
Guide frame with shutter
9
Connection technology – fixed and 9 mounted
10
Internal accessories
11
Locking device

3WT System Overview

1
Main connection, phase barrier
2
Arc chute cover
3
Auxiliary conductor plug-in system, COM16WT
4
Guide frame, shutter, position indicator switch
5
Door sealing frame, locks
6
Electronic trip unit (EUT), metering, BSSWT
7
Closing solenoid, auxiliary trip unit
8
External accessory

3WT Features

Siemens 3WT air circuit breakers provide a high breaking capacity, ensuring they can handle severe short circuits and overloads without compromising system safety. This robust protection minimises downtime and extends the lifespan of electrical equipment, making them ideal for critical power applications.

The 3WT series features a modular design, allowing for easy customisation with a range of accessories and communication modules. This flexibility ensures seamless integration into both new and existing electrical infrastructures, reducing installation time and costs.

With integrated communication interfaces, 3WT ACBs enable real-time monitoring and remote diagnostics. This enhances predictive maintenance capabilities, reducing unexpected failures and improving overall system efficiency.

Designed for energy efficiency, Siemens 3WT ACBs optimise power consumption and reduce energy losses. This helps businesses improve sustainability efforts while maintaining reliable power distribution.

Despite their high performance, 3WT ACBs feature a compact footprint, making them ideal for installations with space constraints. Their design allows for more efficient panel layouts without sacrificing protection or functionality.

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