1SDX255176R1 ABB EPX-XT2S-E2-0634 63A 4-Pole 50kA LSI Electronic MCCB

Why Choose the ABB EPX-XT2S-E2-0634 63A 4-Pole 50kA LSI MCCB?

The ABB EPX-XT2S-E2-0634 is a high-performance 63 A four-pole moulded case circuit breaker (MCCB) designed to provide reliable overload and short-circuit protection in low-voltage electrical distribution systems. Part of the ABB Protecta Power Devices range, this circuit breaker combines the established ABB SACE Tmax XT2S platform with electronic LSI protection and a specified 50 kA short-circuit breaking capacity.

Featuring an electronic LSI trip unit, the EPX-XT2S-E2-0634 provides three essential protection functions: long-time overload protection (L), short-time short-circuit protection (S) and instantaneous short-circuit protection (I). These functions enable electrical engineers to configure protection characteristics according to circuit requirements, helping protect electrical conductors and connected equipment while supporting appropriate coordination between upstream and downstream protective devices.

With its 63 A rated current, four-pole configuration and 50 kA breaking capacity, this MCCB is suitable for appropriately designed three-phase electrical distribution circuits incorporating a neutral conductor. The compact ABB XT2S construction supports integration into compatible ABB Protecta Power distribution assemblies, making it a practical choice for electrical contractors, switchboard manufacturers, consulting engineers and industrial maintenance professionals.

Key Advantages

• 63 A rated current: Suitable for protecting appropriately designed low-voltage electrical distribution circuits.
• Four-pole construction: Supports coordinated switching of three phase conductors and a neutral conductor.
• 50 kA breaking capacity: Provides substantial short-circuit interruption capability under the applicable rated conditions.
• Electronic LSI protection: Combines long-time, short-time and instantaneous protection functions within one MCCB.
• Long-time overload protection: Helps protect cables and connected equipment against sustained excessive current.
• Short-time protection: Provides short-circuit protection with an intentional delay characteristic, supporting suitable protection coordination.
• Instantaneous protection: Provides rapid interruption of high short-circuit currents without intentional time delay.
• Electronic current monitoring: Uses electronic trip technology to evaluate current and initiate protective operation.
• Adjustable protection characteristics: Enables protection settings to be selected within the capabilities of the installed electronic trip unit.
• Improved coordination flexibility: Supports appropriately engineered discrimination between upstream and downstream protective devices.
• ABB SACE Tmax XT2S platform: Uses established ABB circuit breaker technology for dependable electrical protection.
• Compact installation format: Helps optimise space within compatible distribution boards and electrical panels.
• Protecta Power integration: Intended for appropriately configured ABB Protecta Power distribution assemblies.
• Versatile applications: Suitable for commercial distribution boards, industrial electrical panels and building services installations.

Key Features

• Manufacturer: ABB.
• Product group: Protecta Power Devices.
• Product model: EPX-XT2S-E2-0634.
• ABB order code: 1SDX255176R1.
• Circuit breaker family: ABB SACE Tmax XT.
• Frame series: XT2.
• Performance designation: XT2S.
• Frame current class: 160 A.
• Rated current: 63 A.
• Number of poles: 4.
• Specified short-circuit breaking capacity: 50 kA.
• Trip unit technology: Electronic.
• Protection designation: LSI.
• Long-time protection (L): Electronic overload protection with a time-dependent operating characteristic.
• Short-time protection (S): Short-circuit protection with an intentional time-delay characteristic.
• Instantaneous protection (I): Short-circuit protection without intentional time delay.
• Protection configuration: Long-time, short-time and instantaneous functions.
• Four-pole switching: Coordinated operation of three phase conductors and a neutral conductor.
• Operating mechanism: Manual circuit breaker switching mechanism.
• Trip indication: Mechanical indication of circuit breaker operating status.
• Accessory compatibility: Supports appropriately selected ABB Tmax XT2 mounting, connection and operating accessories.
• Product family standard: IEC/EN 60947-2.

Reliable LSI Electronic Protection for 63A Four-Pole Distribution

The ABB EPX-XT2S-E2-0634 provides circuit protection through electronic current monitoring and three complementary protection functions. The long-time protection function (L) responds to sustained overload conditions according to the selected time-current characteristics, helping reduce the risk of excessive heating in electrical cables, terminals and connected equipment. By selecting suitable protection settings, engineers can match the overload response to the electrical circuit's operating requirements and conductor ratings.

The short-time protection function (S) responds to short-circuit currents using an intentional time-delay characteristic. This can help support selective coordination with downstream protective devices where the system design and available trip settings permit. The instantaneous protection function (I) provides rapid interruption of sufficiently high short-circuit currents without intentional time delay. Together, these functions offer greater protection coordination flexibility than a basic fixed-characteristic thermal-magnetic breaker. The precise current thresholds, delay settings and adjustment ranges should be confirmed from ABB documentation for the supplied electronic trip unit.

The ABB SACE Tmax XT2S platform combines electronic protection with a specified 50 kA short-circuit breaking capacity, making this MCCB suitable for appropriately engineered electrical installations requiring substantial fault interruption capability. Its four-pole configuration supports coordinated switching of three phase conductors and a neutral conductor. The neutral pole's protection arrangement, operating voltage, prospective short-circuit current and discrimination requirements should be verified before installation and commissioning.

Typical Applications

• ABB Protecta Power distribution boards: Protection of compatible 63 A four-pole outgoing circuits.
• Commercial electrical distribution: Circuit protection in offices, retail premises and commercial buildings.
• Industrial switchboards: Electronic overload and short-circuit protection for appropriately rated three-phase circuits.
• Main and sub-distribution boards: Protection of outgoing feeders incorporating a neutral conductor.
• Electrical control panels: Protection of suitably designed three-phase equipment supply circuits.
• Building services installations: Electrical distribution for ventilation, heating, cooling and mechanical plant.
• Manufacturing facilities: Protection of appropriately rated industrial electrical distribution circuits.
• Warehouses and logistics centres: Protection of three-phase low-voltage distribution systems.
• Coordinated protection systems: Applications requiring long-time, short-time and instantaneous electronic protection functions.
• High-fault-level installations: Circuits requiring 50 kA short-circuit interruption capability at the applicable operating voltage.
• Electrical panel building: Distribution assemblies incorporating compatible ABB SACE Tmax XT2 electronic circuit breakers.