The Square D MHL366001422 molded case circuit breaker is a high-performance industrial protection device designed for demanding commercial and industrial electrical distribution systems. Built on the MHL frame style with a thermal magnetic non-interchangeable trip unit, this breaker provides reliable overload and short-circuit protection with stable and consistent operation. It comes equipped with a right-hand 2A-2B auxiliary contact module for monitoring and control functions, along with a left-hand 120–240VAC shunt trip for remote tripping capability. Its rugged molded case design, high interrupting capacity, and bolt-on mounting configuration ensure secure installation, enhanced system integration, and long-term operational reliability.

Product Specifications

• Brand: Square D
• Model: MHL366001422
• Frame Style: MHL
• Product Type: Molded Case Circuit Breaker
• Breaker Type: Thermal Magnetic
• Trip Unit: Non-Interchangeable
• Amperage Rating: 600 Ampere
• Number of Poles: 3 Pole
• Mounting Type: Bolt On
• Maximum Voltage Rating: 600V
• Standard Lug Type: Line and Load End
• Auxiliary Contact: Right Hand 2A-2B Installed
• Shunt Trip: Left Hand 120–240VAC Installed
• Operating Temperature Reference: 40°C
• Warranty: One Year

Technical Specifications

• Thermal magnetic trip mechanism for overload and short-circuit protection
• Non-interchangeable trip unit for fixed protection characteristics
• Factory-installed right-hand 2A-2B auxiliary contacts for status signaling and control integration
• Left-hand 120–240VAC shunt trip for remote tripping and system protection control
• Heavy-duty molded case construction for industrial-grade durability
• High interrupting capacity for enhanced electrical system safety
• Bolt-on mounting design for secure and stable installation
• Designed for commercial and industrial power distribution applications
• Reliable performance under high-load electrical conditions

Voltage and Ratings

• Rated Current: 600A
• Rated Maximum Voltage: 600V
• Interrupting Capacity: 65kA @ 240 VAC
• Interrupting Capacity: 65kA @ 480 VAC
• Interrupting Capacity: 25kA @ 600 VAC
• Interrupting Capacity: 14kA @ 250 VDC
• Trip Setting Range: 3000–6000
• Shunt Trip Voltage: 120–240VAC
• Frequency Rating: 50/60Hz

Product Data

• Manufacturer: Square D
• Product Category: Molded Case Circuit Breaker
• Series: MHL Frame
• Connection Type: Bolt On
• Frame Type: M
• Pole Configuration: 3 Pole
• Lug Configuration: Line and Load End Terminals Standard
• Installed Accessories: 2A-2B Auxiliary Contact, 120–240VAC Shunt Trip
• Condition Support: Certified Reconditioned and New Surplus
• Included Warranty Coverage: Shipping, repairs, parts, and labor for recertification
• Application: Commercial and Industrial Electrical Distribution Systems

Important Note

The product image shown represents a base model and is intended for identification purposes only. Accessories purchased together with the breaker can be installed at no additional cost according to customer configuration requirements when installation instructions are provided during checkout. Installation, operation, and maintenance must be performed by qualified electrical personnel in accordance with applicable electrical standards and manufacturer guidelines. Warranty coverage excludes damage caused by misuse, improper installation, or normal wear and tear.