The Square D MA36400 400A 3 Pole Thermal Magnetic MCCB – Plug In – 600V is a reliable molded case circuit breaker designed for efficient protection in commercial and industrial electrical distribution systems. Built on the MA frame style with a thermal magnetic non-interchangeable trip unit, this breaker delivers dependable overload and short-circuit protection for medium-capacity power applications. Its robust design, high interrupting performance, and compatibility with AC and DC systems make it suitable for critical electrical infrastructure requiring stable and safe operation.

Product Specifications

• Brand: Square D
• Model: MA36400
• Rated Current: 400 Ampere
• Number of Poles: 3 Pole
• Breaker Type: Thermal Magnetic Molded Case Circuit Breaker (MCCB)
• Mount Type: Plug In
• Frame Type: MA Frame
• Maximum Voltage: 600 VAC
• Trip Unit Type: Non-Interchangeable
• Standard Lug Type: Load End
• Application: Commercial and Industrial Power Distribution

Technical Specifications

• Interrupting Capacity:
  • 42 kA @ 240 VAC
  • 30 kA @ 480 VAC
  • 22 kA @ 600 VAC
  • 14 kA @ 250 VDC
• Trip Setting Range: 2000 – 4000
• Operating Temperature Reference: 40°C
• Protection Type: Overload and Short Circuit Protection
• Terminal Configuration: Load End Terminals Standard
• Connection Type: Plug In
• Thermal Magnetic Protection Mechanism
• Heavy-Duty Industrial Grade Construction

Voltage and Ratings

• Rated Operational Voltage: Up to 600 VAC
• DC Voltage Rating: 250 VDC
• Current Rating: 400A
• Pole Configuration: 3 Pole
• Interrupting Rating at 240 VAC: 42 kA
• Interrupting Rating at 480 VAC: 30 kA
• Interrupting Rating at 600 VAC: 22 kA
• Interrupting Rating at 250 VDC: 14 kA
• Frequency: 50/60 Hz
• Temperature Calibration: 40°C

Product Data

• Manufacturer: Square D
• Product Condition: New / Certified Reconditioned (Depending on Availability)
• Warranty: 1 Year In-House Warranty
• Connection Style: Plug In
• Frame Style: MA Frame
• Suitable For: Industrial Panels, Switchboards, and Power Distribution Systems
• Accessory Installation: Available at No Additional Cost with Breaker Purchase
• Packaging: Standard Industrial Packaging
• Country of Origin: USA

Important Note

Product images are for identification purposes only and may not reflect the exact configured unit. Accessories purchased together with the breaker can be installed according to your required configuration at no additional cost. Installation, operation, and maintenance must only be performed by qualified electrical professionals in accordance with applicable electrical standards and safety regulations. Warranty coverage includes repairs, replacement parts, labor, and standard shipping required for recertification, excluding damage caused by misuse, improper installation, or normal operational wear and tear.

Returns are easy

You may return items within 30 days of delivery for a refund.

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My Circuit Breakers provides a comprehensive 1-year warranty on both new and reconditioned products. Rest assured, all products are authentic OEM (original equipment manufacturer). Extended warranties are available upon request.