THLC434300 - 300Amp Circuit Breaker

THLC434300 - 300 Amp Circuit Breaker

The THLC434300 is a 300-amp, 3-pole current limiting circuit breaker designed for use in your commercial and industrial power distribution systems. Featuring a non-interchangeable trip unit and unfused construction, this breaker provides overcurrent and short-circuit protection for three-phase electrical applications while maintaining compatibility with existing THLC4 installations. With interrupting ratings of 150kA at 480VAC and 200kA at 240VAC, the THLC434300 is intended for systems where available fault current levels demand a breaker capable of handling significant fault conditions. Its current-limiting design helps you to reduce the amount of fault energy that can pass through the electrical system during a short circuit. Load-side lugs are included, allowing for straightforward conductor termination during installation or replacement. Whether you use it in manufacturing facilities, commercial buildings, or other heavy-duty electrical environments, the THLC434300 remains a practical choice for maintaining existing equipment and supporting reliable operation. Built for long service life, it is well-suited for applications where matching original specifications is important.

Key Features and Benefits

• 300 Amp current rating
• 3-pole design for three-phase systems
• THLC4 breaker configuration
• Current-limiting protection design
• Non-interchangeable trip unit
• Unfused construction
• Includes load-side lugs
• 150kA interrupting rating at 480VAC
• 200kA interrupting rating at 240VAC
• Designed for form, fit, and functional replacement applications
• Built to provide long-term service in demanding electrical environments

Technical Specifications

• Part Number: THLC434300
• Type: THLC4
• Poles: 3
• Current Rating: 300A
• Interrupting Rating: 150kA @ 480VAC
• Interrupting Rating: 200kA @ 240VAC
• Configuration: Unfused
• Trip Unit: Non-Interchangeable
• Included: Load-Side Lugs
• Height: 13.06 in.
• Width: 5.72 in.
• Depth: 4.88 in.

Material Compliance and Certifications

• Industry Standards: This circuit breaker was manufactured for use in electrical distribution systems and is intended to be installed in accordance with applicable electrical codes, equipment requirements, and site-specific standards. Users should verify suitability for their particular application before installation.

Where It Works Best

• The THLC434300 is commonly used in commercial facilities, industrial plants, institutional buildings, and other locations that utilize three-phase power distribution equipment. It is particularly suitable for applications requiring a 300A breaker with high interrupting capacity and compatibility with existing THLC4 equipment.