The Siemens 3WT8080-6UN33-5AB2 800A Air Circuit Breaker represents the pinnacle of industrial power protection technology. Engineered by Siemens AG, one of the world's most respected names in electrical engineering, this air circuit breaker delivers exceptional performance for demanding industrial automation, marine technology, and power distribution applications. With a maximum rated current of 800 amps and rated insulation voltage of 1000V at 50/60Hz, the 3WT8080-6UN33-5AB2 provides comprehensive protection for critical electrical infrastructure.

In today's complex industrial environments, reliable circuit protection is not merely a convenience—it is an absolute necessity. Air circuit breakers (ACBs) serve as the first line of defense against overloads, short circuits, and earth faults that can damage expensive equipment and create hazardous conditions. The Siemens 3WT8 series embodies decades of German engineering excellence, incorporating advanced electronic trip unit technology with robust mechanical construction to deliver protection you can depend on in the most challenging operational scenarios. Whether deployed in marine switchboards, industrial power distribution centers, or offshore platform electrical rooms, this circuit breaker consistently performs to the highest standards.

Key Features & Specifications

The Siemens 3WT8080-6UN33-5AB2 air circuit breaker comes equipped with an impressive array of features designed to maximize protection, simplify installation, and reduce total cost of ownership across the product lifecycle. The integrated ETU37WT electronic trip unit provides precise, adjustable protection characteristics that can be tailored to specific application requirements.

• Maximum Rated Current (In Max): 800 Amps for high-power industrial applications
• Rated Insulation Voltage (Ui): 1000V at 50/60Hz, suitable for modern industrial power systems
• Impulse Withstand Voltage (Uimp): 12 kV, ensuring exceptional transient protection
• Rated Operational Voltage (Ue): 500V for standard industrial distribution
• Breaking Capacity Ics (=Icu): 55 kA, providing outstanding short-circuit protection
• Short-Time Withstand Icw/0.5s: 50 kA for half-second duration
• Product Category: Category B selective protection for coordinated systems
• Compliance: IEC/EN 60947-2 international standard certification
• Trip Unit: ETU37WT electronic trip unit with advanced protection functions
• Manufacturer: Siemens AG, manufactured by Siemens Ltd

Technical Specifications

Specification	Details
Product Model	3WT8080-6UN33-5AB2
Product Series	3WT8 Air Circuit Breaker
Maximum Rated Current	800 Amps
Rated Insulation Voltage (Ui)	1000V at 50/60Hz
Rated Operational Voltage (Ue)	500V
Impulse Withstand Voltage (Uimp)	12 kV
Breaking Capacity Ics (=Icu)	55 kA
Short-Time Withstand (Icw/0.5s)	50 kA
Protection Category	Category B (Selective)
Standards Compliance	IEC/EN 60947-2
Electronic Trip Unit	ETU37WT
Identity Number	6640360209003

Applications & Use Cases

The Siemens 3WT8080-6UN33-5AB2 800A air circuit breaker finds application across a diverse spectrum of industrial automation and marine technology sectors. Its robust 800-amp rating and 55 kA breaking capacity make it ideally suited for primary power distribution protection in large industrial facilities. In marine automation applications, this ACB protects main switchboards on commercial vessels, offshore platforms, and port infrastructure where compliance with IEC/EN 60947-2 is mandatory and reliable power protection is critical to safe operations.

The 1000V insulation rating positions this breaker perfectly for modern industrial power systems that operate at elevated voltages to reduce current and associated losses. Typical deployment scenarios include power generation facilities, petrochemical processing plants, water treatment facilities, and data center power distribution systems. The Category B selective protection characteristic ensures that only the breaker closest to a fault operates, maintaining power to unaffected portions of the installation—a critical feature for facilities where continuous operation is paramount.

Why Choose the Siemens 3WT8080-6UN33-5AB2

When selecting an air circuit breaker for critical power protection duties, several factors distinguish the Siemens 3WT8 series from competing products. Siemens has invested decades of research and development into perfecting the 3WT platform, resulting in a product that delivers exceptional reliability across its entire operational lifecycle. The ETU37WT electronic trip unit provides microprocessor-controlled protection accuracy that far exceeds traditional thermal-magnetic alternatives, with selectable tripping curves and communication capabilities for integration into modern power management systems.

The 12 kV impulse withstand voltage rating demonstrates the breaker's ability to withstand switching transients and lightning-induced overvoltages without insulation breakdown—a critical consideration in industrial environments with significant inductive loads. The 50 kA short-time withstand capability for 0.5 seconds enables selective coordination with downstream protection devices, ensuring that fault clearing occurs at the most appropriate level in the power distribution hierarchy.

Purchasing from Auto2mation provides additional peace of mind. Every product in our inventory undergoes thorough inspection and testing by qualified technicians. This unit comes with our standard 30-day warranty and free shipping, backed by our commitment to customer satisfaction in the industrial automation and marine technology sectors.

Compatibility & Integration

The Siemens 3WT8080-6UN33-5AB2 is designed for seamless integration into Siemens SIVACON and other standard switchgear systems. The 3WT8 series features standardized mounting dimensions and connection points that simplify retrofit projects and new installations alike. The ETU37WT trip unit supports communication protocols compatible with Siemens power management systems, enabling remote monitoring, parameterization, and diagnostic functions that reduce maintenance requirements and improve system uptime.

For facilities with existing Siemens switchgear, the 3WT8080-6UN33-5AB2 can often be installed as a direct replacement for older 3WT series breakers with minimal modification. The breaker's IEC/EN 60947-2 certification ensures compliance with international standards for low-voltage switchgear, facilitating acceptance in jurisdictions worldwide. Auto2mation's technical team can provide guidance on compatibility questions and installation considerations to ensure successful deployment in your specific application.

Maintenance & Support

Siemens designs its 3WT8 series air circuit breakers for long service life with minimal maintenance requirements. The ETU37WT electronic trip unit continuously self-monitors and provides diagnostic information that simplifies troubleshooting and preventive maintenance planning. Recommended maintenance intervals follow Siemens' established guidelines, with particular attention to contact wear inspection, arc chute cleaning, and mechanism lubrication at prescribed intervals based on operational cycle counts.

Auto2mation provides comprehensive post-sale support for all products we supply. Our team includes experienced professionals with deep expertise in industrial automation and marine technology equipment. Should you have questions about installation, operation, or maintenance of your Siemens 3WT8080-6UN33-5AB2, our technical support team is available to assist. We also maintain relationships with authorized service providers who can perform factory-certified maintenance and recertification when required.

Frequently Asked Questions

Q1: What is the difference between Category A and Category B circuit breakers?

Category B circuit breakers, like the Siemens 3WT8080-6UN33-5AB2, provide short-time withstand capability (Icw) that enables selective coordination with downstream protection devices. This means the breaker can sustain high fault currents for a defined period without tripping, allowing a closer downstream breaker to clear the fault first. Category A breakers lack this short-time withstand rating and trip instantaneously on high fault currents.

Q2: What does the ETU37WT electronic trip unit provide?

The ETU37WT is Siemens' advanced electronic trip unit that provides precise, adjustable protection functions including long-time overcurrent protection, short-time protection, instantaneous protection, and ground fault protection. It offers selectable tripping characteristics, digital displays for monitoring, and communication capability for integration into power management systems.

Q3: Is this breaker suitable for marine applications?

Yes, the Siemens 3WT8080-6UN33-5AB2 with its IEC/EN 60947-2 certification is fully suitable for marine switchboard applications. Its robust construction, 1000V insulation rating, and 55 kA breaking capacity make it appropriate for main power distribution protection on vessels and offshore installations. The 50/60Hz rating accommodates both standard power frequencies used worldwide.

Q4: What is the significance of the 55 kA breaking capacity?

The 55 kA breaking capacity (Ics = Icu) indicates the maximum prospective short-circuit current that this breaker can safely interrupt without sustaining damage. This high rating makes the 3WT8080-6UN33-5AB2 suitable for installation points in the power distribution system where fault levels are highest, typically at or near transformer secondaries.

Q5: Does Auto2mation provide warranty and shipping?

Yes, all products purchased from Auto2mation include a 30-day warranty and free worldwide shipping. Our warranty covers defects in materials and workmanship, and our logistics team ensures secure packaging and prompt delivery to your specified location.

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