1SDX255193R1 ABB EPX-XT5S-E2-4004 400A 4-Pole 50kA LSI MCCB

Why Choose the ABB EPX-XT5S-E2-4004 400A 4-Pole MCCB?

The ABB EPX-XT5S-E2-4004 is a high-performance 400 A four-pole moulded case circuit breaker (MCCB) designed to provide dependable overload and short-circuit protection in commercial and industrial electrical distribution systems. Featuring a 50 kA breaking capacity and advanced LSI electronic protection, this circuit breaker is suitable for demanding low-voltage power distribution applications where electrical safety, reliability and continuity of supply are essential.

As part of the ABB Protecta Power Devices range, incorporating the proven SACE Tmax XT5S circuit breaker platform, the EPX-XT5S-E2-4004 combines robust switching technology with intelligent electronic protection. Its Ekip Dip LSI trip unit provides long-time overload protection, short-time delayed short-circuit protection and instantaneous short-circuit protection, helping engineers coordinate protective devices and minimise the impact of electrical faults.

With a rated current of 400 A, a four-pole configuration and a rated ultimate short-circuit breaking capacity of 50 kA at 415 V AC, this MCCB is well suited to main and outgoing distribution circuits, switchboards and electrical panel assemblies. Its compact XT5 frame and compatibility with ABB's modular distribution solutions support efficient installation, maintenance and system integration.

Key Advantages

• 400 A rated current for medium- to high-capacity low-voltage distribution circuits.
• 50 kA short-circuit breaking capacity at 415 V AC for reliable protection against high fault currents.
• Four-pole switching suitable for three-phase electrical systems requiring neutral pole switching.
• Ekip Dip LSI electronic trip unit providing adjustable overload and short-circuit protection.
• Long-time, short-time and instantaneous protection supports coordinated electrical distribution system design.
• ABB SACE Tmax XT5S construction combines robust mechanical performance with compact installation dimensions.
• Suitable for integration into ABB Protecta Power distribution assemblies and compatible switchboards.
• Electronic protection technology supports accurate fault detection and improved protection coordination.

Key Features

• ABB Protecta Power EPX-XT5S-E2-4004 moulded case circuit breaker.
• 400 A rated current.
• Four-pole (4P) configuration.
• 50 kA ultimate breaking capacity at 415 V AC.
• ABB SACE Tmax XT5S 400 frame.
• Ekip Dip LSI electronic protection release.
• L protection: Long-time overload protection.
• S protection: Short-time delayed short-circuit protection.
• I protection: Instantaneous short-circuit protection.
• Fixed circuit breaker construction with front terminal connections.
• Manual lever operating mechanism for circuit switching and isolation duties within its approved ratings.
• Designed for low-voltage distribution systems and switchboard installations.
• Compatible with appropriately selected ABB Tmax XT accessories and installation components.

Reliable Electrical Protection for Power Distribution Systems

Moulded case circuit breakers such as the ABB EPX-XT5S-E2-4004 protect electrical installations by detecting excessive current and interrupting the circuit when overloads or short circuits occur. The Ekip Dip LSI electronic trip unit provides three complementary protection functions, allowing engineers to configure the breaker according to the requirements of the connected electrical installation.

The long-time protection function helps prevent sustained overload currents from damaging cables and connected equipment. Short-time delayed protection enables coordination with downstream protective devices, while instantaneous protection provides rapid interruption of severe short-circuit faults. Together, these functions help improve electrical safety, reduce equipment damage and support selective protection strategies where the overall system design permits.

The ABB Tmax XT5S platform is engineered for reliable operation in demanding low-voltage distribution environments. Its four-pole construction allows switching of three-phase conductors and the neutral conductor where required by the electrical design. When installed in a suitable ABB Protecta Power assembly or compatible switchboard, the EPX-XT5S-E2-4004 provides a dependable solution for protecting substantial electrical loads and distribution feeders.

Typical Applications

• Main and outgoing protection in commercial electrical distribution boards.
• ABB Protecta Power distribution assemblies and switchboards.
• Industrial low-voltage power distribution systems.
• Three-phase distribution circuits requiring four-pole switching.
• Sub-main distribution and feeder circuit protection.
• Commercial buildings, offices and retail developments.
• Manufacturing facilities and industrial production plants.
• Electrical infrastructure in warehouses and logistics centres.
• Mechanical and electrical services distribution panels.
• Large electrical control panels and power distribution equipment.