Siemens air circuit breakers, especially the SENTRON 3WA series, are advanced solutions for power distribution in industrial and infrastructure applications. These circuit breakers are essential for maintaining the reliability and safety of electrical systems, particularly as automation and strict regulatory standards become more prominent.

The SENTRON 3WA air circuit breakers are known for their fail-safe performance in complex environments, ensuring continuous power and protecting against overloads, short circuits, and other potential faults. They are engineered to be flexible and adaptable, allowing for integration into diverse system setups. With intuitive features and straightforward customization options, the SENTRON 3WA breakers simplify installation and operation, making it easier for engineers and facility managers to achieve their power management goals.

SENTRON 3WA

Siemens’ SENTRON 3WA air circuit breakers are designed to meet the growing demands of modern power distribution, providing safety and reliability in increasingly automated environments. As power distribution systems need to comply with stricter standards, the SENTRON 3WA offers a solution that is not only robust but also flexible, allowing for easy customization to suit different infrastructure needs.

This breaker line is engineered to ensure fail-safe operation, helping manufacturers and operators achieve optimal results while maintaining system integrity. With SENTRON 3WA, Siemens aims to simplify complex power distribution challenges, making it easier for users to meet their specific objectives.

3WA1108-3AB42-0AA0

The Siemens 3WA1108-3AB42-0AA0 is a robust withdrawable circuit breaker designed for industrial power distribution applications. This model is part of the 3WA1 Air Circuit Breakers series, conforming to IEC 60947-2 standards, and provides comprehensive protection features ideal for high-current electrical systems.

Key Features and Specifications:

• Number: 3WA1108-3AB42-0AA0
• Frame Size: 1
• Poles: 4-pole configuration (N-pole on the left side)
• Rated Current (In): 800 A
• Voltage Range: Up to 690 V AC, 50/60 Hz

Breaking Capacity:

• Icu: 66 kA at 500 V
• Icu: 50 kA at 690 V
• Trip Unit: ETU300 LSI (providing long-time, short-time, and instantaneous protection, with an internal N-sensor for N-protection)
• Protection Types: LT (long-time), ST (short-time), INST (instantaneous), with included N-protection

Additional Safety Components:

• Integrated trip alarm switch (1 x CO) for immediate fault notification
• Horizontal rear connection for streamlined installation
• Guide frame with shutter, though without a position signaling switch

Manual Operating Mechanism:

• Mechanical closing with a manual operating mechanism
• No spring charging motor; optimized for field-ready manual control

Auxiliary and Signaling Functions:

• Auxiliary Switches: 2NO and 2NC
• Ready-to-Close Signal Switch: Included for additional operational assurance
• No closing coil (CC), remote trip alarm reset coil (RR), or shunt trip features, keeping the device straightforward and focused on essential protection.

Additional Product Information:

• Product Family: 3WA1 Air Circuit Breakers, up to 6300 A (AC), IEC

Compliance and Certifications:

• RoHS Directive: Compliant
• Commodity Code: 85362090
• Country of Origin: Czech Republic

Environmental Compliance:

• WEEE (2012/19/EU): No take-back obligation
• REACH: Information available upon request

Applications

This Siemens 3WA1108-3AB42-0AA0 withdrawable circuit breaker is designed for applications where high power and protection are critical, such as industrial and commercial facilities. Its 4-pole design with N-pole on the left, robust protection features, and simplified manual control make it well-suited for systems requiring high reliability, ease of maintenance, and quick fault management. The guide frame and shutter provide added safety and flexibility, ideal for installations that need routine access to circuit components.