1SDX254822R1 ABB EPX-XT2N-E2-0253 25A 3P 36kA MCCB – LSI

Why Choose the ABB EPX-XT2N-E2-0253 25A 3-Pole MCCB?

The ABB EPX-XT2N-E2-0253 is a high-performance 25 A three-pole moulded case circuit breaker (MCCB) designed to provide dependable overload and short-circuit protection in low-voltage electrical distribution systems. Featuring a 36 kA short-circuit breaking capacity and an advanced Ekip LSI electronic trip unit, this circuit breaker belongs to the ABB Protecta Power Devices range and incorporates ABB's established SACE Tmax XT2N circuit breaker technology.

Designed for commercial and industrial electrical installations, the EPX-XT2N-E2-0253 combines compact construction with configurable electronic protection. Its LSI protection system incorporates long-time overload protection (L), short-time delayed short-circuit protection (S) and instantaneous short-circuit protection (I). These functions allow electrical designers to configure protective characteristics according to circuit requirements and coordinate the MCCB with upstream and downstream protective devices.

With a 25 A rated current, three-pole configuration and 36 kA breaking capacity, the ABB EPX-XT2N-E2-0253 is particularly suitable for three-phase outgoing circuits requiring precise electronic overcurrent protection. Supplied under ABB order code 1SDX254822R1, this MCCB provides a versatile solution for compatible ABB Protecta Power distribution boards, commercial electrical panels and industrial switchgear assemblies.

Key Advantages

• 25 A rated current provides reliable protection for appropriately rated three-phase electrical circuits.
• Three-pole (3P) configuration enables simultaneous switching and protection of three phase conductors.
• 36 kA short-circuit breaking capacity supports installations with substantial prospective fault currents.
• Ekip LSI electronic trip unit provides configurable overload and short-circuit protection.
• Long-time overload protection (L) helps protect cables and connected equipment against sustained excessive current.
• Short-time delayed protection (S) supports coordination with downstream protective devices.
• Instantaneous protection (I) provides rapid interruption of high-current short circuits.
• Independent L, S and I protection functions provide greater flexibility than LS/I releases with selectable S or I operation.
• Electronic trip technology offers adjustable protection characteristics for different electrical distribution requirements.
• Compact ABB SACE Tmax XT2N construction helps optimise available space within distribution assemblies.
• 160 A XT2 frame platform accommodates the 25 A electronic protection configuration.
• Designed for integration into compatible ABB Protecta Power distribution systems.
• Suitable for new installations, distribution board upgrades and compatible ABB MCCB replacement applications.

Key Features

• ABB Protecta Power Devices product group.
• ABB SACE Tmax XT2N moulded case circuit breaker platform.
• 25 A rated current.
• Three-pole (3P) 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 protection characteristics.
• 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 functions for adjustable electronic circuit protection.
• Electronic overcurrent sensing rather than conventional thermal-magnetic trip technology.
• Front-accessible protection settings on the Ekip Dip electronic trip unit.
• XT2N 160 A frame family with a 25 A rated electronic release.
• Fixed-mounted circuit breaker construction for compatible distribution assemblies.
• Front-terminal connection arrangement on the corresponding XT2N Ekip LSI breaker configuration.
• Compact three-pole device format suitable for space-conscious electrical panel layouts.
• Manual toggle-operated mechanism for circuit switching and resetting.
• Designed in accordance with IEC/EN 60947-2 circuit breaker requirements.
• Suitable for compatible ABB Protecta Power mounting and connection arrangements.
• ABB manufacturer order code: 1SDX254822R1.

Advanced 25A Electronic Circuit Protection with Ekip LSI Technology

The ABB EPX-XT2N-E2-0253 combines the mechanical switching and fault-interruption capabilities of an ABB SACE Tmax XT2N MCCB with the configurable protection characteristics of an Ekip LSI electronic trip unit. This combination allows the circuit breaker to respond to overloads and short circuits according to selected current thresholds and operating times, helping safeguard electrical cables, connected equipment and distribution infrastructure.

The long-time protection function (L) responds to sustained overload conditions. By providing an adjustable electronic overload characteristic, the trip unit allows protection settings to be selected according to the rated current of the circuit, conductor characteristics and installation requirements. This helps prevent prolonged excessive current from causing thermal damage to protected conductors and equipment.

The short-time protection function (S) provides a configurable response to short-circuit currents with an intentional delay where appropriate. Short-time delayed protection can help achieve discrimination between upstream and downstream protective devices, reducing the likelihood that an upstream breaker will disconnect a larger part of the electrical installation for a fault that can be cleared by a downstream device. Actual selectivity must be confirmed using the relevant ABB coordination data and calculated fault levels.

The instantaneous protection function (I) provides rapid interruption when the current reaches the selected instantaneous trip threshold. This function is particularly important for limiting exposure to high short-circuit currents. Unlike an Ekip LS/I release, which offers a choice between S and I short-circuit protection modes, the Ekip LSI configuration provides L, S and I characteristics for adjustment within the same electronic protection system.

The ABB SACE Tmax XT2N 160 A frame platform provides a compact and durable circuit breaker construction. Although the mechanical frame belongs to the 160 A family, the EPX-XT2N-E2-0253 is a 25 A rated protective device. Its frame rating must not be confused with the rated current of the installed electronic trip unit.

The three-pole design is suitable for appropriately designed three-phase distribution circuits where the three phase conductors require coordinated switching and overcurrent protection. The standard LSI electronic release provides overload and short-circuit protection rather than residual-current or earth-leakage protection. Where additional earth-leakage protection is required, a suitable protective device or compatible solution must be specified separately.

As part of the ABB Protecta Power Devices range, this MCCB is intended for integration into compatible electrical distribution assemblies. Its 36 kA short-circuit breaking capacity must be assessed against the installation voltage and prospective fault current. Correct protection settings, cable sizing, mounting arrangements and electrical connections are essential for safe and reliable operation.

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 25 A electronic overcurrent protection.
• Commercial building electrical sub-distribution boards.
• Manufacturing facilities and industrial electrical infrastructure.
• Building services and mechanical plant distribution circuits.
• 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.
• Professional electrical installations requiring compact electronic-trip circuit protection.