THJK426400 - 400Amp Circuit Breaker

THJK426400 - 400 Amp Circuit Breaker

The THJK426400 is a 2-pole, 400-amp molded case circuit breaker designed for use in your GE Q-Line distribution systems. Built with a thermal magnetic trip unit and internal common trip mechanism, this breaker provides dependable overcurrent and short-circuit protection for commercial and industrial electrical applications operating at higher current levels. Its bolt-on mounting configuration helps you to provide a secure installation, while the included load-side lugs simplify conductor termination during replacement or maintenance projects.

As part of the THJK4 series, the THJK426400 features a non-interchangeable trip unit, helping maintain the original protection characteristics specified for the electrical system. The breaker is also HACR rated, making it suitable for applications involving heating, air conditioning, and refrigeration equipment where code-compliant circuit protection is required. Built to last and engineered for long-term service, this breaker is commonly used in switchboards, panelboards, and power distribution systems where a 400-amp, 2-pole protective device is required.

Key Features and Benefits

• 400 Amp Continuous Current Rating: 400 Amp continuous current rating.
• 2-Pole Configuration: 2-pole configuration for protecting 240V, 480V, and 600V AC circuits as applicable.
• GE THJK4 Q-Line Molded Case Circuit Breaker: GE THJK4 Q-Line molded case circuit breaker.
• Bolt-On Mounting Design: Bolt-on mounting design for secure installation.
• Thermal Magnetic Trip Unit: Thermal magnetic trip unit provides overload and short-circuit protection.
• Internal Common Trip Mechanism: Internal common trip mechanism helps ensure simultaneous tripping of all poles.
• Non-Interchangeable Trip Unit: Non-interchangeable trip unit maintains factory-specified protection settings.
• HACR Rated: HACR rated for heating, air conditioning, and refrigeration applications.
• Includes Load-Side Lugs: Includes load-side lugs for convenient field installation.
• Commercial and Industrial Applications: Designed for use in commercial and industrial power distribution systems.

Technical Specifications

• Manufacturer Series: GE Q-Line
• Part Number: THJK426400
• Type: THJK4
• Circuit Breaker Type: Molded Case Circuit Breaker
• Mounting Style: Bolt-On
• Poles: 2
• Amperage Rating: 400A
• Trip Unit: Thermal Magnetic
• Trip Configuration: Internal Common Trip
• Trip Unit Style: Non-Interchangeable
• HACR Rated: Yes
• Included Accessories: Load-Side Lugs
• Interrupting Ratings:
  • 25kA @ 600VAC
  • 35kA @ 480VAC
  • 65kA @ 240VAC
• Dimensions:
  • Height: 10.13 in
  • Width: 8.25 in
  • Depth: 3.81 in

Material Compliance and Certifications

• HACR Rated: HACR Rated.
• Electrical System Requirements: Manufactured for use in accordance with applicable electrical system requirements and equipment specifications.
• GE THJK4 Q-Line Performance Characteristics: Designed and tested to meet the ratings and performance characteristics associated with the GE THJK4 Q-Line product family.
• Installation Requirements: Verify installation requirements and local electrical codes prior to application.

Where It Works Best

• The THJK426400 is well suited for commercial buildings, industrial facilities, manufacturing operations, distribution equipment, mechanical systems, and large HVAC installations requiring a 400-amp, 2-pole circuit breaker. It is commonly used as a replacement breaker in existing GE Q-Line equipment where matching form, fit, and electrical ratings are essential for maintaining system compatibility and protection requirements.