THLC434300WL - 300Amp Circuit Breaker

THLC434300WL - 300 Amp Circuit Breaker

The THLC434300WL is a 300-amp, 3-pole current-limiting circuit breaker designed for use in your electrical distribution systems that require dependable overcurrent protection and high interrupting capacity. Featuring a non-interchangeable trip unit and an unfused current-limiting design, this breaker helps you to protect conductors and connected equipment from overloads and short-circuit conditions while supporting system coordination requirements. Built for long service life in commercial and industrial environments, the THLC434300WL includes both line-side and load-side lugs for straightforward installation and secure conductor termination. With interrupting ratings of 150kA at 480VAC and 200kA at 240VAC, it is well suited for applications where a high available fault current is present.

Key Features and Benefits

• 300 Amp continuous current rating
• 3-pole configuration for three-phase electrical systems
• Type THLC4 current limiting circuit breaker
• Unfused design reduces component count within the circuit
• Non-interchangeable trip unit helps maintain original protection settings
• High interrupting capacity rated at 150kA @ 480VAC and 200kA @ 240VAC
• Includes both line-side and load-side lugs
• Designed for commercial, industrial, and institutional power distribution applications
• Built to provide long-term service in demanding electrical environments
• Suitable as a form, fit, and functional replacement where THLC4 specifications are required

Technical Specifications

• Part Number: THLC434300WL
• Type: THLC4
• Poles: 3
• Amperes: 300A
• Voltage / A.I.C. Rating: 150kA @ 480VAC; 200kA @ 240VAC
• Trip Unit: Non-Interchangeable
• Circuit Breaker Design: Current Limiting, Unfused
• Included Accessories: Line-Side and Load-Side Lugs
• Height: 13.06 in.
• Width: 5.72 in.
• Depth: 4.88 in.

Material Compliance and Certifications

• Industry Standards: This circuit breaker is manufactured for use in electrical power distribution systems and is intended to meet applicable industry standards associated with its original design and ratings. Users should verify installation requirements, local code compliance, and application suitability with qualified electrical professionals before installation.

Where It Works Best

• The THLC434300WL is commonly used in commercial buildings, manufacturing facilities, institutional campuses, and other electrical distribution systems that require a 300A, 3-pole, current-limiting circuit breaker. Its high interrupting ratings make it particularly suitable for installations with elevated available fault current levels. This breaker is often selected for switchboards, panelboards, and distribution equipment requiring compatibility with Type THLC4 specifications and a non-interchangeable trip configuration.