1SDX253309R1 ABB EPX-XT1N-TM0403 40A 3-Pole 36kA MCCB Thermal-Magnetic

Why Choose the ABB EPX-XT1N-TM0403 40A 3-Pole MCCB?

The ABB EPX-XT1N-TM0403 is a compact and reliable 40 A three-pole moulded case circuit breaker (MCCB) designed to provide effective overload and short-circuit protection in commercial and industrial electrical distribution systems. Part of the ABB Protecta Power Devices range, this circuit breaker incorporates thermal-magnetic protection technology and offers a 36 kA short-circuit breaking capacity for demanding low-voltage power distribution applications.

Designed for use with ABB Protecta Power distribution equipment, the EPX-XT1N-TM0403 provides dependable circuit protection while helping maintain electrical safety and operational continuity. Its thermal-magnetic trip mechanism combines thermal overload protection with magnetic short-circuit protection, allowing the breaker to respond to different types of electrical faults. The compact XT1 frame makes it particularly suitable for installations where panel space and reliable protection are important considerations.

With a 40 A rated current, three-pole configuration and 36 kA breaking capacity, the ABB EPX-XT1N-TM0403 is suitable for protecting three-phase electrical circuits in commercial buildings, industrial facilities and power distribution installations. Identified by ABB order code 1SDX253309R1, this MCCB is part of the Protecta Power range of protective devices designed for integration into compatible electrical distribution assemblies.

Key Advantages

• Reliable 40 A moulded case circuit breaker designed for low-voltage electrical distribution systems.
• Three-pole protection suitable for three-phase electrical circuits.
• 36 kA short-circuit breaking capacity for applications requiring high fault-current protection.
• Integrated thermal-magnetic trip protection against overloads and short circuits.
• Compact ABB XT1 frame design helps optimise space within electrical distribution equipment.
• Part of the ABB Protecta Power Devices range for commercial and industrial power distribution.
• Mechanical switching and circuit isolation functionality for electrical protection and maintenance operations.
• Suitable for integration into compatible ABB Protecta Power distribution boards and electrical assemblies.

Key Features

• ABB Protecta Power Devices product range.
• EPX-XT1N-TM0403 model designation.
• 40 A rated current for electrical circuit protection.
• Three-pole (3P) configuration for three-phase applications.
• 36 kA short-circuit breaking capacity in the specified Protecta Power configuration.
• Thermal-magnetic (TMA) protection for overload and short-circuit faults.
• XT1N frame designation within ABB's moulded case circuit breaker family.
• Thermal protection responds to sustained overload conditions.
• Magnetic protection provides rapid operation under high short-circuit current conditions.
• Compact moulded case construction suitable for installation within compatible distribution equipment.
• Three-pole switching enables simultaneous operation of the protected phases.
• Designed for dependable operation in commercial and industrial low-voltage distribution systems.

Reliable Circuit Protection for Electrical Distribution Systems

Moulded case circuit breakers such as the ABB EPX-XT1N-TM0403 protect electrical circuits against excessive current caused by overloads and short circuits. Unlike a conventional switching device, an MCCB incorporates protective trip mechanisms that automatically interrupt the electrical supply when specified fault conditions occur, helping reduce the risk of equipment damage and electrical hazards.

The thermal-magnetic protection system uses two complementary operating principles. The thermal element responds to sustained overload currents, providing protection against excessive heating in electrical circuits. The magnetic element reacts rapidly to high fault currents associated with short circuits, helping limit the effects of severe electrical faults.

The ABB XT1N three-pole design provides protection across three phases within a single compact device. Its 40 A current rating makes it suitable for appropriately designed outgoing distribution circuits, while the 36 kA breaking capacity supports installations with significant prospective fault levels. The selected circuit breaker must have a breaking capacity appropriate to the prospective short-circuit current at its installation point.

As part of the ABB Protecta Power range, the EPX-XT1N-TM0403 is intended for use in compatible power distribution assemblies. Its compact construction and established thermal-magnetic protection technology make it a practical choice for electrical contractors, panel builders, facilities engineers and industrial maintenance teams.

Typical Applications

• Commercial building electrical distribution systems.
• ABB Protecta Power distribution boards and compatible assemblies.
• Three-phase outgoing circuit protection.
• Industrial electrical distribution panels.
• Electrical switchboards and power distribution equipment.
• Manufacturing and production facilities.
• Commercial premises, offices and retail buildings.
• Warehouses and logistics facilities.
• Building services electrical installations.
• Electrical infrastructure maintenance and replacement projects.
• Protection of appropriately rated electrical feeders and distribution circuits.
• Low-voltage distribution installations requiring thermal-magnetic circuit protection.