1SDX255192R1 ABB EPX-XT5S-E2-3204 320A 4-Pole 50kA LSI Electronic MCCB

Why Choose the ABB EPX-XT5S-E2-3204 320A 4-Pole 50kA LSI MCCB?

The ABB EPX-XT5S-E2-3204 is a high-performance 320 A four-pole moulded case circuit breaker (MCCB) designed to provide dependable 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 XT5S platform with electronic LSI protection and a specified 50 kA short-circuit breaking capacity. It is an effective protection solution for commercial switchboards, industrial power distribution and appropriately configured three-phase electrical installations.

Featuring an electronic LSI trip unit, the EPX-XT5S-E2-3204 provides three essential protection functions: long-time overload protection (L), short-time short-circuit protection (S) and instantaneous short-circuit protection (I). These complementary functions help protect electrical conductors, busbars and connected equipment against excessive current while providing flexibility for protection coordination. Electronic trip technology enables engineers to select supported protection settings according to the requirements of the installation and its upstream and downstream protective devices.

With its 320 A rated current, four-pole configuration and 50 kA breaking capacity, this MCCB is particularly suitable for three-phase distribution circuits incorporating a neutral conductor. The ABB XT5S platform combines robust construction with established electronic protection technology, supporting installation in compatible ABB Protecta Power distribution assemblies. It is a practical choice for electrical contractors, switchboard manufacturers, consulting engineers and industrial maintenance professionals requiring dependable circuit protection for higher-current distribution applications.

Key Advantages

• 320 A rated current: Provides protection for appropriately designed higher-current low-voltage electrical distribution circuits.
• Four-pole construction: Supports coordinated switching of three phase conductors and a neutral conductor.
• 50 kA breaking capacity: Offers substantial short-circuit interruption capability under the applicable rated conditions.
• Electronic LSI protection: Combines long-time, short-time and instantaneous protection functions within a single MCCB.
• Long-time overload protection: Helps protect cables, busbars and connected equipment against sustained excessive current.
• Short-time protection: Provides short-circuit protection with an intentional time-delay characteristic to support appropriate protection coordination.
• Instantaneous protection: Enables 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.
• Configurable protection characteristics: Supports adjustment of protection settings within the capabilities of the installed electronic trip unit.
• Protection coordination flexibility: Helps engineers design appropriately coordinated upstream and downstream protective arrangements.
• ABB SACE Tmax XT5S platform: Uses established ABB circuit breaker technology for dependable electrical distribution protection.
• 400 A frame class: Incorporates the XT5 platform designed for higher-current distribution applications while providing a 320 A device rating.
• Protecta Power compatibility: Intended for integration into appropriately configured ABB Protecta Power distribution boards.
• Versatile applications: Suitable for commercial switchboards, industrial electrical distribution and building services installations.

Key Features

• Manufacturer: ABB.
• Product group: Protecta Power Devices.
• Product model: EPX-XT5S-E2-3204.
• ABB order code: 1SDX255192R1.
• Circuit breaker family: ABB SACE Tmax XT.
• Frame series: XT5.
• Performance designation: XT5S.
• Frame current class: 400 A.
• Rated current: 320 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 XT5 mounting, connection and operating accessories.
• Product family standard: IEC/EN 60947-2.

Reliable LSI Electronic Protection for 320A Four-Pole Electrical Distribution

The ABB EPX-XT5S-E2-3204 provides dependable circuit protection through electronic current monitoring and three complementary protection functions. Its 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 conductors, busbars, terminals and connected equipment. By selecting suitable protection settings, electrical engineers can coordinate the overload response with conductor ratings and normal operating requirements, particularly in higher-current distribution circuits where thermal management and conductor protection are important design considerations.

The short-time protection function (S) responds to short-circuit currents using an intentional time-delay characteristic. This can support selective coordination with downstream protective devices where the installation 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 conventional fixed-characteristic thermal-magnetic breaker. The precise protection thresholds, delay settings and adjustment ranges should be confirmed from ABB technical documentation for the supplied electronic trip unit.

The ABB SACE Tmax XT5S 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, making it particularly relevant to three-phase distribution systems where neutral isolation is required. Engineers should verify the neutral pole protection arrangement, rated operating voltage, prospective short-circuit current, conductor capacity, temperature conditions and discrimination requirements before installation and commissioning.

Typical Applications

• ABB Protecta Power distribution boards: Protection of compatible 320 A four-pole outgoing circuits.
• Commercial electrical distribution: Circuit protection in offices, retail developments, hotels and large commercial buildings.
• Industrial switchboards: Electronic overload and short-circuit protection for appropriately rated three-phase distribution circuits.
• Main and sub-distribution boards: Protection of higher-current outgoing feeders incorporating a neutral conductor.
• Electrical control panels: Protection of suitably designed three-phase equipment supply circuits.
• Building services installations: Electrical distribution for heating, ventilation, air conditioning and mechanical plant.
• Manufacturing facilities: Protection of industrial electrical distribution circuits, production equipment feeders and plant power supplies.
• Warehouses and logistics centres: Protection of three-phase low-voltage electrical 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 XT5 electronic circuit breakers.