1SDX255189R1 ABB EPX-XT5S-E2-3203 320A 3-Pole 50kA LSI MCCB Protecta Power

Why Choose the ABB EPX-XT5S-E2-3203 320A 3-Pole MCCB?

The ABB EPX-XT5S-E2-3203 (1SDX255189R1) is a high-performance 320 A three-pole moulded case circuit breaker (MCCB) designed to provide dependable overload and short-circuit protection in low-voltage electrical distribution systems. As part of the ABB Protecta Power Devices range, this circuit breaker uses the established ABB SACE Tmax XT5S platform to deliver advanced electronic circuit protection for commercial buildings, industrial facilities and electrical distribution assemblies.

Featuring an electronic LSI trip unit, the EPX-XT5S-E2-3203 provides three essential protection functions: long-time overload protection (L), short-time delayed short-circuit protection (S) and instantaneous short-circuit protection (I). These functions enable electrical engineers to configure protective characteristics according to installation requirements, helping safeguard electrical cables, distribution equipment and connected circuits against damaging overcurrent conditions.

With a rated current of 320 A, a three-pole configuration and a rated ultimate short-circuit breaking capacity of 50 kA at 415 V AC, the ABB EPX-XT5S-E2-3203 is suitable for demanding three-phase electrical distribution applications. Its XT5S 400 frame and electronic protection technology provide a practical solution for outgoing circuit protection within compatible ABB Protecta Power distribution boards.

Key Advantages

• High-performance 320 A moulded case circuit breaker for low-voltage electrical distribution.
• Three-pole (3P) configuration provides simultaneous switching and protection of three phase conductors.
• 50 kA ultimate short-circuit breaking capacity at 415 V AC supports protection in installations with substantial prospective fault currents.
• Advanced electronic LSI trip unit provides configurable overload and short-circuit protection.
• Long-time (L) protection responds to sustained overload conditions.
• Short-time delayed (S) protection supports coordination between upstream and downstream protective devices.
• Instantaneous (I) protection provides rapid interruption during significant short-circuit faults.
• Based on the proven ABB SACE Tmax XT5S 400 frame.
• Electronic trip technology provides flexible protection settings for different electrical distribution requirements.
• Designed for integration into compatible ABB Protecta Power distribution assemblies.

Key Features

• ABB Protecta Power Devices circuit breaker range.
• EPX-XT5S-E2-3203 electronic trip moulded case circuit breaker.
• ABB order code 1SDX255189R1.
• ABB SACE Tmax XT5S 400 circuit breaker platform.
• 320 A rated current.
• Three-pole (3P) construction.
• 50 kA rated ultimate short-circuit breaking capacity at 415 V AC.
• S short-circuit performance classification.
• Electronic LSI protection for overload and short-circuit faults.
• Adjustable long-time overload protection.
• Short-time delayed short-circuit protection for selective coordination.
• Instantaneous short-circuit protection for rapid fault interruption.
• Electronic protection settings allow adaptation to electrical installation requirements.
• XT5S 400 frame suitable for high-current electrical distribution applications.
• Manual switching mechanism with automatic protective tripping.
• Three-phase circuit switching and protection functionality.
• Designed for low-voltage AC power distribution systems.
• Compatible with suitable ABB Protecta Power outgoing MCCB arrangements.
• Suitable for commercial, industrial and infrastructure electrical protection applications.

Technical Specifications

• Manufacturer: ABB
• Product group: Protecta Power Devices
• Circuit breaker family: SACE Tmax XT
• Frame: XT5S 400
• Model: EPX-XT5S-E2-3203
• ABB order code: 1SDX255189R1
• Manufacturer description: EPX-XT5S-E2-3203 320A 3P 50kA MCCB - LSI
• Product type: Moulded case circuit breaker (MCCB)
• Rated current (In): 320 A
• Number of poles: 3
• Rated ultimate short-circuit breaking capacity (Icu): 50 kA at 415 V AC
• Breaking capacity class: S
• Trip unit: Electronic LSI
• Protection technology: Electronic
• Long-time protection (L): Adjustable overload protection
• Short-time protection (S): Delayed short-circuit protection
• Instantaneous protection (I): Short-circuit protection
• Frame rated current: 400 A
• Electrical system: Three-phase low-voltage AC distribution
• Rated insulation voltage (Ui), XT5 platform: 1000 V
• Rated impulse withstand voltage (Uimp), XT5 platform: 8 kV
• Operating mechanism: Manual switching with automatic protective tripping
• Mounting arrangement: Compatible Protecta Power outgoing MCCB mounting system
• Applicable circuit breaker standard: IEC/EN 60947-2
• Compatible distribution system: ABB Protecta Power
• Application: Overload and short-circuit protection for three-phase electrical distribution circuits

Advanced Electronic Circuit Protection for Industrial Power Distribution

Moulded case circuit breakers are essential components in modern electrical distribution systems, protecting cables and equipment against excessive current and short-circuit faults. The ABB EPX-XT5S-E2-3203 combines the robust switching capabilities of the SACE Tmax XT5S platform with electronic LSI protection, enabling electrical engineers to configure circuit protection according to the characteristics of the installation.

The LSI electronic trip unit incorporates three complementary protection functions. Long-time protection (L) responds to sustained overload conditions, helping prevent overheating of electrical conductors and connected equipment. Short-time protection (S) provides delayed tripping under specified short-circuit conditions, supporting selective coordination with downstream protective devices. Instantaneous protection (I) provides rapid interruption when a high fault current exceeds the configured threshold.

The circuit breaker has a 320 A rated current and a 50 kA ultimate short-circuit breaking capacity at 415 V AC. These characteristics make it suitable for appropriately designed electrical distribution systems where the prospective fault current is within the device's rated capability. Its electronic protection functions provide greater adjustment flexibility than conventional fixed thermal-magnetic trip arrangements.

The three-pole configuration allows all three phase conductors to be switched and protected together, making the device suitable for three-phase electrical feeders, distribution circuits and industrial power systems. The appropriate protection settings must be selected according to conductor ratings, prospective fault currents, connected loads and coordination requirements.

As part of the ABB Protecta Power Devices range, the EPX-XT5S-E2-3203 is designed for integration into compatible low-voltage distribution assemblies. Its XT5S 400 frame provides a robust mechanical platform for high-current applications. Suitable mounting components, electrical connections and cable accommodation must be selected for the complete switchboard arrangement. For larger outgoing cables, a compatible side cableway extension box may be required to provide sufficient installation space.

Typical Applications

• ABB Protecta Power low-voltage electrical distribution boards.
• Three-phase industrial electrical distribution circuits.
• Commercial building main and sub-main distribution systems.
• Industrial switchgear and power distribution assemblies.
• Manufacturing facilities and production plant power supplies.
• Electrical feeder protection requiring electronic LSI characteristics.
• Distribution systems requiring coordinated short-circuit protection.
• Commercial infrastructure and building services installations.
• Industrial machinery and equipment distribution circuits.
• Electrical switchboard manufacturing and professional panel building.
• Power distribution upgrades and replacement MCCB installations.
• OEM electrical distribution and engineered switchgear systems.