1SDX254839R1 ABB EPX-XT4N-E2-0404 40A 4-Pole 36kA LSI MCCB Protecta Power

Why Choose the ABB EPX-XT4N-E2-0404 40A 4-Pole MCCB?

The ABB EPX-XT4N-E2-0404 (1SDX254839R1) is a high-performance 40 A four-pole moulded case circuit breaker (MCCB) designed to provide reliable overload and short-circuit protection in low-voltage electrical distribution systems. As part of the ABB Protecta Power Devices range, this circuit breaker is based on the proven ABB SACE Tmax XT4N platform, delivering advanced electronic protection for commercial buildings, industrial installations and electrical distribution assemblies.

Featuring an Ekip electronic LSI trip unit, the EPX-XT4N-E2-0404 provides three essential protection functions: long-time overload protection (L), short-time delayed short-circuit protection (S) and instantaneous short-circuit protection (I). These functions allow electrical engineers to configure protection characteristics according to the requirements of the installation, helping protect cables, distribution equipment and connected electrical circuits against damaging overcurrent conditions.

With a rated current of 40 A, a four-pole configuration and a rated ultimate short-circuit breaking capacity of 36 kA at 415 V AC, the ABB EPX-XT4N-E2-0404 is suitable for three-phase distribution circuits requiring dependable circuit protection and coordinated switching. Its compact XT4N frame and electronic protection technology make it an effective solution for integration into compatible ABB Protecta Power distribution boards.

Key Advantages

• High-performance 40 A moulded case circuit breaker designed for low-voltage power distribution.
• Four-pole (4P) configuration supports three-phase and neutral electrical distribution circuits.
• 36 kA ultimate short-circuit breaking capacity at 415 V AC provides protection against substantial prospective fault currents.
• Advanced Ekip electronic LSI trip unit delivers configurable overload and short-circuit protection.
• Long-time (L) protection helps prevent damage caused by sustained overload conditions.
• Short-time delayed (S) protection supports coordination between upstream and downstream protective devices.
• Instantaneous (I) protection provides rapid interruption during significant short-circuit faults.
• Based on the established ABB SACE Tmax XT4N circuit breaker platform.
• Designed for integration into compatible ABB Protecta Power distribution assemblies.
• Electronic protection settings offer greater flexibility than conventional fixed thermal-magnetic protection.

Key Features

• ABB Protecta Power Devices circuit breaker range.
• EPX-XT4N-E2-0404 electronic trip moulded case circuit breaker.
• ABB order code 1SDX254839R1.
• ABB SACE Tmax XT4N circuit breaker platform.
• 40 A rated current.
• Four-pole (4P) construction.
• 36 kA rated ultimate short-circuit breaking capacity at 415 V AC.
• N breaking capacity classification.
• Ekip electronic LSI protection.
• Long-time overload protection with adjustable characteristics.
• Short-time delayed short-circuit protection for improved protection coordination.
• Instantaneous short-circuit protection for rapid fault interruption.
• Electronic trip technology provides consistent protection characteristics.
• Compact XT4 frame suitable for modular electrical distribution assemblies.
• Manual switching mechanism with automatic protective tripping.
• Designed for low-voltage AC electrical distribution systems.
• Compatible with appropriately configured ABB Protecta Power outgoing MCCB installations.
• Suitable for commercial, industrial and infrastructure electrical protection applications.

Technical Specifications

• Manufacturer: ABB
• Product group: Protecta Power Devices
• Circuit breaker family: SACE Tmax XT
• Frame: XT4N
• Model: EPX-XT4N-E2-0404
• ABB order code: 1SDX254839R1
• Manufacturer description: EPX-XT4N-E2-0404 40A 4P 36kA MCCB - LSI
• Product type: Moulded case circuit breaker (MCCB)
• Rated current (In): 40 A
• Number of poles: 4
• Rated ultimate short-circuit breaking capacity (Icu): 36 kA at 415 V AC
• Breaking capacity class: N
• Trip unit: Ekip electronic LSI
• Protection technology: Electronic
• Long-time protection (L): Adjustable overload protection
• Short-time protection (S): Adjustable delayed short-circuit protection
• Instantaneous protection (I): Short-circuit protection
• Electrical system: Low-voltage AC distribution
• Mounting arrangement: Compatible Protecta Power MCCB mounting system
• Operating mechanism: Manual switching with automatic protective tripping
• Applicable circuit breaker standard: IEC/EN 60947-2
• Compatible distribution system: ABB Protecta Power
• Application: Overload and short-circuit protection for three-phase electrical distribution circuits

Advanced Electronic Circuit Protection for Electrical Distribution

Moulded case circuit breakers are essential components in modern electrical distribution systems, providing protection against excessive current and short-circuit faults. The ABB EPX-XT4N-E2-0404 combines the mechanical switching capabilities of the SACE Tmax XT4N platform with an electronic LSI trip unit, allowing protection characteristics to be configured according to the requirements of the electrical installation.

The LSI electronic protection system incorporates three complementary functions. Long-time protection (L) responds to sustained overload conditions, helping prevent overheating of electrical conductors and connected equipment. Short-time protection (S) introduces a controlled delay for specified short-circuit conditions, supporting selective coordination between protective devices. Instantaneous protection (I) provides rapid tripping when a sufficiently high fault current is detected.

The circuit breaker has a 40 A rated current and a 36 kA ultimate breaking capacity at 415 V AC. These characteristics make it suitable for appropriately designed distribution circuits where the prospective short-circuit current is within the device's rated capability. The electronic trip unit offers protection flexibility that is particularly useful when coordinating multiple circuit breakers within a distribution system.

Its four-pole configuration supports three-phase and neutral electrical distribution arrangements, allowing all four poles to be operated together. The appropriate neutral protection configuration and protective settings must be selected according to the electrical system design, conductor arrangement and applicable installation requirements.

As part of the ABB Protecta Power Devices range, the EPX-XT4N-E2-0404 is intended for integration into compatible low-voltage distribution assemblies. Correct installation requires the appropriate mounting components, electrical connections and protection settings. Coordination with upstream and downstream protective devices should be assessed to achieve the required fault protection and selectivity.

Typical Applications

• ABB Protecta Power low-voltage electrical distribution boards.
• Three-phase and neutral electrical distribution circuits.
• Commercial building main and sub-main distribution systems.
• Industrial electrical distribution and switchgear assemblies.
• Manufacturing facilities and production equipment power supplies.
• Electrical feeder protection requiring electronic LSI characteristics.
• Distribution systems requiring coordinated circuit breaker protection.
• Commercial building services and infrastructure installations.
• Industrial control panels and electrical distribution cabinets.
• Electrical switchboard manufacturing and panel building.
• Power distribution upgrades and replacement MCCB installations.
• OEM electrical distribution and engineered switchgear systems.