1SDX254852R1 ABB EPX-XT5N-E2-2504 250A 4P 36kA MCCB – LSI

Why Choose the ABB EPX-XT5N-E2-2504 250A 4-Pole MCCB?

The ABB EPX-XT5N-E2-2504 is a high-performance 250 A four-pole moulded case circuit breaker (MCCB) designed to provide dependable overload and short-circuit protection in commercial and industrial low-voltage electrical distribution systems. Featuring a 36 kA short-circuit breaking capacity and an advanced Ekip Dip LSI electronic trip unit, this circuit breaker forms part of the ABB Protecta Power Devices range and incorporates ABB's established SACE Tmax XT5N circuit breaker technology.

Designed for installations requiring flexible electronic protection, the EPX-XT5N-E2-2504 combines a robust moulded case construction with configurable long-time, short-time delayed and instantaneous overcurrent protection. Its LSI protection system allows electrical designers to configure protection characteristics according to the operating requirements of the installation, supporting appropriate cable protection and coordination with upstream and downstream circuit breakers.

With a 250 A rated current, four-pole configuration and 36 kA breaking capacity, the ABB EPX-XT5N-E2-2504 is particularly suitable for three-phase distribution circuits where simultaneous switching of the phase conductors and neutral is required. Supplied under ABB order code 1SDX254852R1, this electronic-trip MCCB provides a versatile circuit protection solution for compatible ABB Protecta Power distribution boards, commercial switchgear and industrial electrical panels.

Key Advantages

• 250 A rated current provides dependable protection for appropriately rated three-phase electrical distribution circuits.
• Four-pole (4P) configuration supports simultaneous switching of three phase conductors and a neutral conductor where applicable.
• 36 kA short-circuit breaking capacity supports installations with substantial prospective fault currents.
• Ekip Dip LSI electronic trip unit provides configurable overload and short-circuit protection.
• Long-time overload protection (L) helps protect conductors and connected equipment against sustained excessive current.
• Short-time delayed protection (S) supports protective device coordination and discrimination.
• Instantaneous protection (I) provides rapid interruption during high-current short circuits.
• Separate L, S and I protection functions offer greater configuration flexibility than LS/I releases with selectable S or I operation.
• Electronic trip technology allows protection characteristics to be configured for different circuit requirements.
• Front-accessible DIP-switch settings provide practical adjustment of electronic protection parameters.
• ABB SACE Tmax XT5N construction combines robust circuit protection with a compact moulded case design.
• 190 mm nominal four-pole width supports planned integration into compatible electrical distribution assemblies.
• XT5N 400 A frame platform provides the mechanical basis for the 250 A electronic protection configuration.
• Designed for integration into compatible ABB Protecta Power distribution systems.
• Suitable for installations requiring four-pole switching and configurable electronic overcurrent protection.

Key Features

• ABB Protecta Power Devices product group.
• ABB SACE Tmax XT5N moulded case circuit breaker platform.
• 250 A rated current.
• Four-pole (4P) configuration.
• 36 kA short-circuit breaking capacity under the applicable rated operating conditions.
• Ekip Dip LSI electronic protection release.
• Long-time overload protection (L) with configurable electronic settings.
• Short-time delayed short-circuit protection (S) for protection coordination.
• Instantaneous short-circuit protection (I) for rapid fault interruption.
• Separate L, S and I protection characteristics for flexible circuit protection.
• Electronic overcurrent sensing rather than conventional thermal-magnetic trip technology.
• Front-accessible DIP switches for electronic protection adjustments.
• Trip-unit indications to assist commissioning, inspection and maintenance.
• XT5N 400 A frame family with a 250 A rated electronic release.
• Four-pole construction for appropriately designed three-phase and neutral distribution arrangements.
• Fixed-mounted circuit breaker platform for compatible electrical distribution assemblies.
• Front-terminal connection arrangement on the corresponding XT5N Ekip Dip LSI breaker.
• 190 mm nominal four-pole device width in the ABB Protecta Power XT5 range.
• Manual toggle-operated switching mechanism.
• Designed in accordance with IEC/EN 60947-2.
• Designed for installation using compatible ABB Protecta Power mounting and connection accessories.
• ABB manufacturer order code: 1SDX254852R1.

Advanced 250A Four-Pole Electronic Circuit Protection with Ekip LSI Technology

The ABB EPX-XT5N-E2-2504 combines the mechanical switching and fault-interruption capabilities of an ABB SACE Tmax XT5N MCCB with the configurable protection characteristics of an Ekip Dip LSI electronic trip unit. This combination enables the circuit breaker to respond to overload and short-circuit conditions according to selected protective thresholds and operating characteristics, helping safeguard electrical cables, connected equipment and distribution infrastructure.

The long-time protection function (L) responds to sustained overload conditions. Adjustable electronic settings allow the protective response to be matched to the electrical installation's expected load, conductor ratings and design requirements. This helps reduce the risk of thermal damage caused by prolonged excessive current while supporting dependable operation of the protected distribution circuit.

The short-time protection function (S) provides a configurable response to short-circuit currents with an intentional delay where appropriate. This function is particularly valuable in distribution systems where protective device selectivity is important. By coordinating upstream and downstream circuit breakers, electrical designers can help minimise unnecessary disconnection of unaffected circuits when a downstream fault occurs. Actual discrimination must be confirmed using ABB's published coordination data and the installation's prospective fault-current calculations.

The instantaneous protection function (I) provides rapid interruption when the current reaches the selected instantaneous trip threshold. This helps limit the duration of high-current short circuits. Unlike an Ekip LS/I release, which offers a choice between short-time delayed and instantaneous protection modes, the Ekip LSI configuration provides separate long-time, short-time delayed and instantaneous protection characteristics for adjustment.

The ABB SACE Tmax XT5N 400 A frame platform provides a robust mechanical foundation for the 250 A electronic trip configuration. Although the XT5N frame is rated at 400 A, the EPX-XT5N-E2-2504 is a 250 A rated protective device. The mechanical frame rating must not be confused with the rated current of the electronic trip unit or the allowable current of the protected circuit.

The four-pole construction enables simultaneous switching of four conductors, typically three phase conductors and a neutral conductor in an appropriately designed three-phase distribution system. This arrangement can be useful where neutral isolation is required by the electrical design. However, four-pole switching does not automatically mean that the neutral conductor has the same overcurrent protection arrangement as the phase conductors. The neutral-pole protection configuration must be confirmed against the applicable ABB technical documentation.

For ABB Protecta Power distribution assemblies, the XT5 platform provides a high-current outgoing circuit solution with a 190 mm nominal four-pole width. ABB's Protecta Power installation guidance also recommends considering a side cableway extension box for XT5 outgoing devices where larger conductors require additional wiring space. Correct selection of cable terminations, mounting accessories and enclosure arrangements is essential for dependable installation.

The EPX-XT5N-E2-2504 offers a specified 36 kA short-circuit breaking capacity. This rating must be checked against the installation's operating voltage and prospective fault current before selection. The standard LSI electronic release provides overload and short-circuit protection rather than residual-current or earth-leakage protection, so any required additional protective functions must be specified separately.

Typical Applications

• ABB Protecta Power distribution boards and compatible electrical assemblies.
• Commercial low-voltage electrical distribution systems.
• Industrial electrical distribution panels and switchgear.
• Three-phase outgoing circuits requiring 250 A electronic overcurrent protection.
• Four-pole distribution circuits requiring simultaneous phase and neutral switching.
• Commercial building main and sub-distribution assemblies.
• Manufacturing facilities and industrial electrical infrastructure.
• Building services and mechanical plant power distribution.
• Electrical installations requiring adjustable long-time overload protection.
• Distribution systems where short-time delayed protection supports selective coordination.
• Installations requiring separate long-time, short-time and instantaneous protection characteristics.
• Electrical refurbishment and distribution board upgrades involving compatible ABB MCCBs.