ABB XT5 400A 3P Molded Case Circuit Breaker – XT5 Series – Thermal Magnetic LI – 50kA @ 480V

The ABB XT5 400A molded case circuit breaker is engineered for high-demand commercial, industrial, and marine power distribution systems. As part of the SACE Tmax XT5 family, this 3-pole breaker provides reliable overcurrent protection with an adjustable thermal-magnetic trip unit for both long-time and instantaneous (LI) functions.

Designed for unit-mount installation, it integrates seamlessly into ReliaGear neXT panelboards, switchboards, and motor control centers. It also serves as a direct replacement for legacy T5S400BW breakers, enabling efficient system upgrades without redesigning existing infrastructure.

Voltage and Rating

• Current Rating: 400 A
• Amperage Range: 280–400 A
• Voltage Rating: 600 VAC / 600 VDC
• AIC Rating:
  • 100kA @ 240VAC
  • 50kA @ 480VAC
  • 25kA @ 600VAC
  • 50kA @ 250VDC
  • 35kA @ 500VDC
  • 25kA @ 600VDC

Key Specifications

• Device Type: Molded Case Circuit Breaker (MCCB)
• Series: XT5 (SACE Tmax XT5)
• Number of Poles: 3-Pole
• Phase: 3 Phase
• Trip Technology: Thermal Magnetic
• Trip Function Code: LI
• Trip Functions: Long-Time, Instantaneous
• Trip Adjustability: Adjustable Thermal, Adjustable Magnetic
• Mounting Style: Unit Mount
• Terminal Type: Lugs

Technical Specifications

• Wire Gauge: (2) 2/0 AWG – 500 kcmil (Cu/Al)
• Max Wire Size: 500 kcmil
• Min Wire Size: 2/0 AWG
• Temperature Rating: -25°C to 70°C

Features

• Adjustable Thermal-Magnetic Protection (LI)
• High Interrupting Capacity for Industrial Applications
• HACR Rated for HVAC Systems
• Reverse Feed Capability
• Compatible with ABB ReliaGear neXT Systems
• Retrofit Replacement for Legacy T5S Series Breakers

Returns are easy

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

FREE Shipping on orders over $149.

My Circuit Breakers offers one to five day delivery in the United States. The variation depends on the chosen shipping speed and the warehouse location for the product(s).

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In rare circumstances, My Circuit Breakers may reserve up to 5 business days to complete shipment. Feel free to contact us if your order is time sensitive.

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.