1SDX255143R1 ABB EPX-XT2S-E1-0254 25A 4-Pole 50kA MCCB LS/I

Why Choose the ABB EPX-XT2S-E1-0254 25A 4-Pole 50kA MCCB?

The ABB EPX-XT2S-E1-0254 is a high-performance 25 A four-pole moulded case circuit breaker (MCCB) designed to provide reliable overload and short-circuit protection in commercial and industrial low-voltage electrical distribution systems. Part of the ABB Protecta Power Devices range, this circuit breaker combines a 50 kA short-circuit breaking capacity with an Ekip LS/I electronic trip unit, delivering flexible protection for three-phase and neutral electrical circuits.

Built around the established ABB SACE Tmax XT2S platform, the EPX-XT2S-E1-0254 incorporates electronic protection technology that allows its operating characteristics to be configured according to the electrical installation. Unlike conventional thermal-magnetic MCCBs, the electronic trip unit provides adjustable protection functions designed to support accurate overload protection and appropriate short-circuit response.

The LS/I protection arrangement provides long-time overload protection (L) together with a selectable short-circuit protection characteristic: short-time delayed protection (S) or instantaneous protection (I). This flexibility allows electrical designers to select a protection strategy suited to the conductor ratings, prospective fault currents and coordination requirements of the distribution system.

Its four-pole (4P) configuration supports coordinated switching of three phase conductors and a neutral conductor where required by the electrical installation design. This makes the circuit breaker particularly useful for appropriately designed three-phase and neutral distribution arrangements in commercial buildings, industrial facilities and electrical distribution assemblies.

With its 25 A rated current, 50 kA breaking capacity and compact 120 mm four-pole width, the ABB EPX-XT2S-E1-0254 offers a versatile circuit protection solution for compatible ABB Protecta Power panelboards. The product is identified by ABB order code 1SDX255143R1, supporting accurate specification, procurement, maintenance and replacement.

Key Advantages

• 25 A rated current for appropriately designed low-current electrical distribution circuits.
• Four-pole (4P) configuration supports coordinated switching of three phase conductors and a neutral conductor.
• 50 kA short-circuit breaking capacity for installations requiring substantial fault-interruption performance.
• Ekip LS/I electronic trip unit provides configurable overload and short-circuit protection.
• Long-time overload protection (L) helps safeguard conductors and connected equipment against sustained excessive current.
• Selectable short-time or instantaneous protection supports different short-circuit protection strategies.
• Adjustable electronic protection characteristics help match the circuit breaker to the electrical installation.
• Short-time delayed protection option can assist with coordination between upstream and downstream protective devices.
• Instantaneous protection option provides rapid tripping when the selected short-circuit threshold is reached.
• Four-pole switching supports electrical distribution arrangements requiring neutral disconnection.
• Compact 120 mm four-pole width supports efficient use of space within compatible distribution equipment.
• ABB SACE Tmax XT2S construction combines robust mechanical design with electronic circuit protection technology.
• High breaking capacity relative to rated current supports smaller outgoing circuits supplied from higher-fault-level distribution systems.
• ABB Protecta Power compatibility supports integration into appropriately configured distribution assemblies.
• ABB order code identification simplifies product selection, procurement and maintenance documentation.

Key Features

• ABB Protecta Power Devices product group.
• EPX-XT2S-E1-0254 product designation.
• 25 A rated current for low-voltage electrical distribution.
• Four-pole (4P) construction for three-phase and neutral circuits.
• 50 kA specified short-circuit breaking capacity.
• Electronic Ekip LS/I trip unit for configurable circuit protection.
• Long-time protection (L) for sustained overload conditions.
• Short-time protection (S) option for delayed short-circuit tripping.
• Instantaneous protection (I) option for rapid short-circuit tripping.
• Selectable S or I protection mode alongside the long-time protection function.
• Adjustable overload protection characteristics within the manufacturer's specified settings.
• Configurable short-circuit protection to support installation requirements.
• Electronic current sensing for protective trip operation.
• Four-pole switching arrangement for circuits requiring coordinated phase and neutral disconnection.
• ABB SACE Tmax XT2S platform with S short-circuit performance classification.
• XT2 160 frame family for professional low-voltage distribution applications.
• 120 mm four-pole device width for compact installation.
• Manual switching mechanism with automatic electronic protective tripping.
• Robust moulded case construction suitable for commercial and industrial distribution systems.
• Compatible ABB Protecta Power installation using the appropriate mounting and connection components.
• ABB order code 1SDX255143R1 for accurate product identification.

Advanced Electronic LS/I Protection for Four-Pole Electrical Distribution

The ABB EPX-XT2S-E1-0254 provides advanced electronic protection for low-voltage electrical distribution systems where reliable overload protection, configurable short-circuit response and four-pole switching are required. Its Ekip LS/I electronic trip unit offers greater flexibility than a conventional fixed-characteristic circuit breaker, helping electrical designers match protective performance to the requirements of the installation.

The long-time protection function (L) provides overload protection for the connected electrical circuit. It responds when current exceeds the configured protection threshold for a sufficient period, helping prevent excessive heating of conductors and connected equipment. Correct adjustment of the long-time protection settings is essential to ensuring that the circuit breaker provides suitable protection for the conductor size, installation method and expected operating load.

The short-time protection function (S) provides a delayed response to short-circuit currents when this mode is selected. The delay can be useful in electrical distribution systems where coordination between upstream and downstream protective devices is required. By allowing a downstream device an opportunity to clear a fault first, a correctly designed protection arrangement may reduce unnecessary disconnection of unaffected circuits.

Alternatively, the instantaneous protection function (I) provides rapid operation when the fault current reaches the selected threshold. This mode is suitable where fast fault interruption is the priority and a short-time delay is not required. The appropriate choice depends on the prospective fault current, connected equipment, conductor withstand characteristics and overall protection strategy.

An important distinction is that LS/I protection does not mean that all three L, S and I functions operate independently at the same time. The ABB Ekip LS/I arrangement provides long-time overload protection together with a choice between short-time delayed and instantaneous short-circuit protection. Where independent L, S and I functions are required together, an LSI trip-unit configuration should be considered.

The 25 A rated current makes the EPX-XT2S-E1-0254 suitable for appropriately designed lower-current distribution feeders and outgoing circuits. Its electronic protection settings allow the MCCB to be configured for the application within the manufacturer's specified adjustment limits. This flexibility is particularly valuable where protection coordination must be considered alongside conductor protection and operational continuity.

The four-pole construction is an important feature of this MCCB. Unlike a three-pole circuit breaker, a four-pole device can provide coordinated switching of the neutral conductor alongside the three phase conductors. This may be necessary for certain electrical distribution arrangements, isolation requirements and installation designs. The suitability of neutral switching must be assessed against the earthing system, applicable electrical standards and the specific circuit configuration.

It is also important to distinguish between neutral switching and neutral overcurrent protection. A four-pole circuit breaker includes an additional switched pole, but the protection characteristics of that pole depend on the specific device construction and electronic trip-unit configuration. Electrical designers should verify the manufacturer's neutral pole arrangements and applicable protection characteristics before specifying the MCCB for a particular installation.

The 50 kA short-circuit breaking capacity is a key characteristic of the XT2S platform. Electrical distribution systems can experience prospective short-circuit currents considerably higher than their normal operating currents. The selected MCCB must therefore be capable of interrupting the maximum prospective fault current at its installation point. Breaking-capacity ratings are voltage-dependent, so the applicable ABB technical data should be checked against the actual system operating voltage.

The ABB SACE Tmax XT2S platform combines electronic protection capability with compact mechanical construction. Its 120 mm four-pole width supports efficient integration into compatible electrical distribution assemblies, while the XT2 160 frame family provides a practical solution for professional low-voltage power distribution.

As part of the ABB Protecta Power Devices range, the EPX-XT2S-E1-0254 is intended for installation in compatible panelboards and distribution assemblies using the correct mounting and connection components. Before commissioning, electrical designers and installers should verify the prospective fault current, operating voltage, conductor ratings, electronic trip settings, neutral requirements, discrimination requirements and compatibility with the selected distribution assembly.

Typical Applications

• Commercial and industrial low-voltage electrical distribution systems.
• ABB Protecta Power panelboards and compatible distribution assemblies.
• Three-phase outgoing circuits requiring four-pole switching.
• Industrial switchboards and sub-distribution panels.
• Manufacturing and production facilities.
• Commercial offices and business premises.
• Retail buildings and hospitality facilities.
• Warehouses and logistics centres.
• Building services electrical distribution.
• Lower-current three-phase and neutral feeder circuits.
• Distribution circuits requiring electronic overload protection.
• Installations requiring selectable short-time or instantaneous short-circuit protection.
• Electrical distribution systems where protection coordination is important.
• Installations requiring a 50 kA short-circuit breaking capacity.
• Electrical distribution arrangements requiring appropriately designed neutral switching.
• Electrical infrastructure upgrades, maintenance and replacement projects.