1SDX255144R1 ABB EPX-XT2S-E1-0634 63A 4P 50kA MCCB – Ekip LS/I

Why Choose the ABB EPX-XT2S-E1-0634 63A 4-Pole 50kA MCCB with Ekip LS/I Protection?

The ABB EPX-XT2S-E1-0634 is a high-performance 63 A four-pole moulded case circuit breaker (MCCB) designed for dependable overload and short-circuit protection in commercial and industrial low-voltage electrical distribution systems. Combining a 50 kA short-circuit breaking capacity with an advanced ABB Ekip LS/I electronic trip unit, this circuit breaker offers configurable protection for installations where reliable fault interruption and effective protective-device coordination are essential.

Part of the ABB Protecta Power Devices range, the EPX-XT2S-E1-0634 incorporates the established ABB SACE Tmax XT2S circuit breaker platform. Its electronic protection release provides adjustable long-time overload protection (L) together with a choice of short-time delayed (S) or instantaneous (I) short-circuit protection. This LS/I arrangement allows electrical designers to configure the circuit breaker for different protection requirements without relying on a conventional thermal-magnetic trip mechanism.

Featuring a 63 A rated current, four-pole configuration and 50 kA breaking capacity, the ABB EPX-XT2S-E1-0634 is suited to appropriately designed three-phase distribution circuits requiring four-pole switching. Its compact XT2S construction makes it particularly useful in compatible ABB Protecta Power distribution boards, commercial switchgear and industrial electrical panels. Identified by ABB order code 1SDX255144R1, this MCCB delivers advanced electronic circuit protection in a practical, space-efficient format.

Key Advantages

• 63 A rated current provides reliable overcurrent protection for appropriately designed low-voltage distribution circuits.
• Four-pole (4P) configuration supports coordinated switching of three phase conductors and a neutral conductor.
• 50 kA short-circuit breaking capacity provides substantial fault-current interruption capability.
• ABB Ekip LS/I electronic trip unit offers configurable protection beyond conventional thermal-magnetic releases.
• Adjustable long-time overload protection (L) enables the protection threshold to be matched to circuit requirements.
• Selectable short-time delayed protection (S) supports coordination with downstream protective devices where appropriate.
• Selectable instantaneous protection (I) provides rapid tripping for high short-circuit currents.
• LS/I operating flexibility allows selection between short-time delayed and instantaneous short-circuit protection modes.
• Electronic current monitoring supports repeatable protection characteristics and configurable trip settings.
• ABB SACE Tmax XT2S technology combines robust mechanical switching with electronic overcurrent protection.
• S breaking-capacity classification provides a higher specified breaking capacity than corresponding XT2N 36 kA configurations.
• Compact 120 mm four-pole platform supports efficient use of space within compatible distribution assemblies.
• 160 A XT2 frame family provides the mechanical platform for the 63 A electronic protection configuration.
• Manual toggle-operated mechanism enables straightforward local switching and resetting.
• Designed for integration into compatible ABB Protecta Power distribution systems.

Key Features

• ABB Protecta Power Devices product group.
• ABB SACE Tmax XT2S moulded case circuit breaker platform.
• 63 A rated current.
• Four-pole (4P) configuration.
• 50 kA short-circuit breaking capacity at 415 V AC for the corresponding XT2S IEC breaker configuration.
• Ekip LS/I electronic protection release.
• Electronic long-time overload protection (L).
• Adjustable long-time protection settings for appropriate circuit coordination.
• Selectable short-time delayed short-circuit protection (S).
• Selectable instantaneous short-circuit protection (I).
• LS/I selection: long-time protection combined with either S or I short-circuit protection.
• Electronic overcurrent sensing rather than conventional thermal-magnetic tripping.
• Configurable protection characteristics for professional electrical distribution applications.
• XT2S 160 A frame platform with a 63 A electronic protection release.
• Four-pole construction for appropriately designed three-phase and neutral distribution arrangements.
• 120 mm nominal four-pole width for the XT2S platform.
• Fixed-mounted circuit breaker configuration.
• Front-terminal connection arrangement.
• Manual toggle-operated switching mechanism.
• Mechanical operating and trip indication.
• Rated operational voltage: Up to 690 V AC for the corresponding XT2S configuration.
• Rated insulation voltage: 1,000 V.
• Rated impulse withstand voltage: 8 kV.
• Designed in accordance with IEC/EN 60947-2.
• ABB manufacturer order code: 1SDX255144R1.

Advanced 63A Ekip LS/I Electronic Protection with 50kA Breaking Capacity

The ABB EPX-XT2S-E1-0634 combines the switching and short-circuit interruption capabilities of the ABB SACE Tmax XT2S platform with an Ekip LS/I electronic trip unit. This electronic protection system monitors circuit current and operates the breaker when the selected protection conditions are met. Compared with a conventional thermal-magnetic release, electronic protection provides greater flexibility in setting overload thresholds and choosing the required short-circuit protection characteristic.

The long-time overload protection function (L) protects the connected circuit against sustained overcurrent conditions. It uses an inverse-time operating characteristic, meaning that larger overload currents generally produce shorter tripping times. The long-time protection threshold and associated settings must be selected according to the protected conductors, expected load, installation conditions and the applicable ABB Ekip LS/I trip curves.

The short-time delayed protection function (S) is designed to respond to short-circuit currents using a defined delay characteristic. Where suitable, this can help coordinate the upstream MCCB with downstream protective devices, allowing a downstream device an opportunity to clear a fault before the upstream breaker operates. Successful discrimination depends on the complete protective-device arrangement and must be confirmed using ABB's published coordination data.

The instantaneous protection function (I) provides rapid tripping when the detected current reaches the configured instantaneous threshold. This operating mode is useful where fast interruption of high fault currents is a priority. The threshold must be selected with regard to prospective short-circuit current, conductor protection, equipment characteristics and any permissible transient starting currents.

A key distinction of the Ekip LS/I release is that the short-circuit protection characteristic is selectable between S and I. The device provides long-time overload protection together with either short-time delayed or instantaneous short-circuit protection, depending on its configuration. It should not be described as providing independently adjustable S and I functions simultaneously. Installations requiring both functions together should be assessed for a suitable Ekip LSI configuration.

The XT2S breaking-capacity classification provides a specified 50 kA short-circuit breaking capacity. For the corresponding ABB XT2S IEC breaker, both the rated ultimate breaking capacity (Icu) and rated service breaking capacity (Ics) are 50 kA at 415 V AC. This provides substantial fault-current interruption capability for appropriately designed low-voltage installations, including distribution circuits with relatively high prospective short-circuit currents.

Short-circuit breaking capacity is dependent on operating voltage. For the corresponding XT2S electronic breaker configuration, the rated ultimate breaking capacity is 50 kA across 380–440 V AC, reducing to 36 kA at 500 V AC, 25 kA at 525 V AC and 12 kA at 690 V AC. Electrical designers must confirm the applicable rating for the intended system voltage and ensure that it is adequate for the calculated prospective fault current.

The four-pole construction supports coordinated 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 the installation requires neutral isolation alongside phase switching. However, the presence of four poles does not automatically establish the neutral conductor's protection settings or sensing arrangement. The precise neutral-pole configuration must be confirmed against the manufacturer's documentation.

The ABB SACE Tmax XT2S 160 A frame platform provides the mechanical foundation for the 63 A electronic protection configuration. Although the XT2 frame family supports higher current ratings, the EPX-XT2S-E1-0634 is specifically a 63 A rated protective device. The frame rating must not be confused with the rated current of the installed electronic release or the current-carrying capacity of the protected circuit.

As part of the ABB Protecta Power Devices range, the EPX-XT2S-E1-0634 is designed for integration into compatible distribution assemblies. The fixed-mounted XT2S platform and front-terminal arrangement support installation within suitable electrical panels. Correct mounting accessories, conductor terminations, protection settings and enclosure arrangements must be selected according to ABB's installation instructions.

The standard Ekip LS/I electronic trip unit provides overload and short-circuit protection rather than dedicated residual-current or earth-leakage protection. Where earth-leakage protection is required, a suitable additional protective device or compatible protection arrangement must be specified. Final selection should be supported by fault-level calculations, conductor sizing, protection coordination studies and the applicable electrical installation standards.

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 63 A electronic overcurrent protection.
• Four-pole circuits requiring coordinated switching of phase and neutral conductors.
• Distribution circuits requiring a 50 kA short-circuit breaking capacity.
• Commercial building main and sub-distribution systems.
• Manufacturing facilities and industrial electrical infrastructure.
• Building services and mechanical plant power distribution.
• Installations requiring configurable electronic overload protection.
• Electrical distribution systems requiring a choice of short-time delayed or instantaneous protection.
• Professional installations where protective-device coordination is an important design consideration.