1SDX254827R1 ABB EPX-XT2N-E2-0254 25A 4P 36kA LSI Electronic Moulded Case Circuit Breaker

Why Choose the ABB EPX-XT2N-E2-0254 25A 4-Pole Electronic Moulded Case Circuit Breaker?

The ABB EPX-XT2N-E2-0254 is a high-performance 25 A four-pole moulded case circuit breaker (MCCB) designed to deliver dependable overload and short-circuit protection in low-voltage electrical distribution systems. Part of the ABB Protecta Power Devices product group, this electronic circuit breaker combines a compact design with configurable protection technology for commercial, industrial and building services applications.

Built around the established ABB SACE Tmax XT2N160 circuit breaker platform, the EPX-XT2N-E2-0254 incorporates an ABB Ekip LSI electronic trip configuration. This provides three essential overcurrent protection functions: long-time overload protection, short-time delayed short-circuit protection and instantaneous short-circuit protection. Together, these functions support precise circuit protection and coordination within appropriately designed electrical distribution networks.

With a 25 A rated current, a specified 36 kA short-circuit breaking capacity and a four-pole (4P) configuration, the EPX-XT2N-E2-0254 is suitable for three-phase outgoing circuits where coordinated switching of the phase conductors and neutral conductor is required. Its 120 mm nominal width supports efficient integration into compatible ABB Protecta Power distribution assemblies.

Identified by ABB order code 1SDX254827R1, this MCCB is a practical choice for electrical contractors, consulting engineers, panel builders and facilities managers seeking a 25 A, 4P, 36 kA electronic LSI circuit breaker with configurable protection characteristics and the engineering pedigree of the ABB SACE Tmax XT range.

Key Advantages

• 25 A rated current: Provides protection for appropriately designed three-phase distribution circuits and connected equipment.
• 36 kA breaking capacity: Offers substantial short-circuit interruption capability in the specified ABB Protecta Power application.
• Four-pole construction: Enables coordinated switching of three phase conductors and a neutral conductor.
• Electronic LSI protection: Combines long-time, short-time and instantaneous overcurrent protection functions.
• ABB Ekip electronic technology: Supports configurable protection characteristics for different circuit requirements.
• Long-time overload protection: Helps protect conductors and equipment against excessive current sustained over time.
• Short-time delayed protection: Supports coordination with downstream protective devices where the installation design permits.
• Instantaneous short-circuit protection: Provides rapid interruption under sufficiently high fault-current conditions.
• Protection coordination flexibility: Allows engineers to consider overload and short-circuit characteristics independently within the capabilities of the release.
• XT2N160 platform: Uses the established ABB SACE Tmax XT2 circuit breaker design.
• Compact 120 mm width: Supports efficient space planning in compatible electrical distribution assemblies.
• Four-pole switching capability: Suitable for installations where the neutral conductor must be disconnected with the phases.
• ABB Protecta Power compatibility: Intended for use with appropriate ABB Protecta Power mounting and connection arrangements.
• Versatile applications: Suitable for commercial premises, industrial panels, building services and sub-distribution systems.

Key Features

• ABB Protecta Power Devices product group.
• EPX-XT2N-E2-0254 product designation.
• ABB order code 1SDX254827R1.
• ABB SACE Tmax XT2N160 circuit breaker platform.
• 25 A rated current for appropriately sized outgoing circuits.
• 160 A frame platform with a 25 A rated electronic protection release.
• 36 kA specified short-circuit breaking capacity.
• Four-pole (4P) configuration for three-phase and neutral switching.
• ABB Ekip LSI electronic trip technology.
• Long-time protection (L) against sustained overload conditions.
• Short-time protection (S) against short-circuit conditions with a delayed response characteristic.
• Instantaneous protection (I) for rapid operation during high-current short circuits.
• LSI protection arrangement incorporating all three overcurrent protection functions.
• Electronic trip settings for appropriate circuit protection coordination.
• 120 mm nominal width for four-pole XT2 installation planning.
• Manual operating mechanism for circuit switching and isolation when correctly installed and rated for the intended duty.
• Compatible ABB Protecta Power installation, subject to the correct assembly components and connection arrangements.
• Three-phase low-voltage distribution applications.

Advanced 25A Electronic LSI Protection for Three-Phase Electrical Distribution

The ABB EPX-XT2N-E2-0254 25 A electronic MCCB is designed to help maintain the safety and reliability of commercial and industrial low-voltage electrical installations. By automatically interrupting current under defined abnormal conditions, the circuit breaker helps protect cables, distribution equipment and connected electrical loads against the potentially damaging effects of overloads and short circuits.

Unlike conventional thermal-magnetic circuit breakers, which rely on thermal and magnetic mechanisms to initiate tripping, the EPX-XT2N-E2-0254 uses an electronic trip release to evaluate current conditions and operate according to its configured protection characteristics. This electronic approach provides greater flexibility for electrical engineers responsible for circuit protection design and coordination.

The ABB Ekip LSI electronic trip configuration incorporates three important protection functions. Long-time protection (L) responds to sustained overload conditions that could otherwise cause excessive heating of electrical conductors and connected equipment. Its operating characteristics are selected to suit the protected circuit and the capabilities of the fitted release.

Short-time protection (S) responds to short-circuit conditions with a defined delay characteristic. Where supported by the overall protection design, this can help an upstream protective device remain closed long enough for an appropriately selected downstream device to clear a fault. Achieving discrimination or selectivity requires verification using the relevant ABB coordination data and cannot be assumed solely from the presence of an LSI trip unit.

Instantaneous protection (I) provides rapid operation when fault current reaches the applicable instantaneous threshold. This function is particularly important in limiting the duration of severe short-circuit conditions. Together, the L, S and I functions provide a comprehensive overcurrent protection arrangement for suitably designed low-voltage electrical circuits.

The distinction between LSI and LS/I is significant when specifying electronic MCCBs. An LSI release incorporates long-time, short-time and instantaneous protection functions together. An LS/I release provides long-time overload protection with a choice between short-time and instantaneous short-circuit protection modes. The LSI arrangement offers additional flexibility where both delayed and instantaneous short-circuit protection characteristics are required.

Four-Pole Switching for Three-Phase and Neutral Distribution Circuits

The four-pole configuration of the ABB EPX-XT2N-E2-0254 enables coordinated switching of three phase conductors and a neutral conductor. This makes the breaker suitable for appropriately designed three-phase distribution circuits where neutral disconnection forms part of the installation requirements.

Four-pole circuit breakers are commonly considered for commercial distribution boards, building services panels and other installations where the electrical design calls for switching all live conductors. Whether neutral switching is required or permitted depends on the earthing arrangement, applicable electrical regulations and the intended operating conditions.

It is important to distinguish between neutral switching and neutral overcurrent protection. A four-pole MCCB provides a fourth switching pole, but this does not automatically confirm that the neutral conductor has the same overcurrent protection characteristics as the phase conductors. The specific neutral protection arrangement should be checked against the fitted ABB electronic release and associated technical documentation.

For installation planning, the ABB XT2 four-pole platform has a nominal width of 120 mm. This compact construction helps panel builders and electrical designers allocate space within compatible distribution boards while accommodating the four-pole switching arrangement.

Selecting the Correct 25A MCCB for Your Installation

The 25 A rating of the EPX-XT2N-E2-0254 identifies the rated current of the specified protective device. It should not be confused with the 160 A frame rating of the XT2N160 platform. The frame rating describes the circuit breaker platform, while the rated current and fitted electronic release determine the protective device selected for the circuit.

The specified 36 kA short-circuit breaking capacity is another essential selection parameter. The prospective short-circuit current at the point of installation must be assessed, and the circuit breaker's applicable breaking capacity must be confirmed for the operating voltage and installation conditions. A breaking-capacity figure should not be assumed to apply identically at every voltage.

Electrical designers should also assess conductor sizing, load characteristics, electronic trip settings, upstream and downstream protective devices, neutral conductor requirements and the available space within the distribution assembly. Where discrimination, cascading or back-up protection is required, the relevant ABB coordination documentation should be consulted.

For projects using the ABB Protecta Power distribution system, the EPX-XT2N-E2-0254 offers a clearly identified electronic MCCB option with a 25 A rating, four-pole switching and LSI protection. Appropriate mounting, terminals, connections and assembly compatibility should be verified before installation.

Typical Applications

• ABB Protecta Power distribution boards requiring 25 A four-pole electronic MCCB protection.
• Commercial building electrical distribution and appropriately rated outgoing circuits.
• Industrial control and distribution panels requiring three-phase and neutral switching.
• Three-phase sub-distribution systems where electronic LSI protection is specified.
• Building services installations supplying appropriately rated mechanical and electrical equipment.
• Manufacturing facilities and workshop electrical distribution networks.
• Warehouses and logistics centres with three-phase electrical infrastructure.
• Office buildings and retail premises requiring dedicated outgoing electrical circuits.
• Distribution board refurbishment projects using compatible ABB Protecta Power equipment.
• Switchboard manufacturing and panel-building projects requiring a 25 A, 4P, 36 kA electronic LSI MCCB.