1SDX254853R1 ABB EPX-XT5N-E2-3204 320A 4P 36kA MCCB Ekip LSI

Why Choose the ABB EPX-XT5N-E2-3204 Protecta Power Circuit Breaker?

The ABB EPX-XT5N-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 commercial and industrial low-voltage electrical distribution systems. Part of the ABB Protecta Power Devices range, this circuit breaker incorporates the ABB SACE Tmax XT5N400 platform with an Ekip LSI electronic trip unit, delivering configurable protection for electrical distribution assemblies and high-capacity outgoing circuits.

Featuring a 36 kA short-circuit breaking capacity, the EPX-XT5N-E2-3204 is designed to interrupt electrical faults while helping protect conductors, switchgear and connected equipment. Its electronic trip unit incorporates long-time overload protection (L), short-time delayed short-circuit protection (S) and instantaneous short-circuit protection (I), providing flexibility for protective device coordination throughout low-voltage electrical installations.

With a 320 A rated current, four-pole configuration and 190 mm nominal width, this MCCB is particularly suitable for higher-current three-phase distribution circuits requiring four-pole switching. Its robust ABB Tmax XT5N construction and configurable electronic protection make it a practical solution for electrical contractors, panel builders and maintenance engineers working with ABB Protecta Power distribution boards and commercial switchboards.

Key Advantages

• 320 A rated current provides protection for appropriately designed higher-capacity low-voltage distribution circuits.
• Four-pole (4P) configuration supports simultaneous switching of three phase conductors and a neutral conductor where required.
• 36 kA short-circuit breaking capacity provides protection against significant prospective electrical fault currents.
• Ekip LSI electronic trip unit incorporates long-time, short-time delayed and instantaneous protection functions.
• Configurable electronic protection characteristics support circuit protection coordination and selectivity.
• Long-time overload protection (L) helps protect conductors against sustained excessive current.
• Short-time delayed protection (S) can assist coordination with downstream circuit breakers.
• Instantaneous protection (I) enables rapid interruption of high short-circuit currents.
• ABB SACE Tmax XT5N400 platform combines robust moulded case construction with advanced electronic protection.
• 190 mm nominal width provides a defined installation footprint for compatible four-pole distribution assemblies.
• Suitable for higher-current commercial and industrial electrical distribution applications.
• Designed for integration into compatible ABB Protecta Power electrical distribution assemblies.

Key Features

• ABB Protecta Power Devices product family.
• EPX-XT5N-E2-3204 model designation.
• ABB SACE Tmax XT5N moulded case circuit breaker platform.
• 320 A rated current.
• XT5N400 frame with a maximum frame rating of 400 A.
• Four-pole (4P) circuit breaker construction.
• 36 kA short-circuit breaking capacity.
• Ekip LSI electronic trip unit.
• L protection: Long-time overload protection.
• S protection: Short-time delayed short-circuit protection.
• I protection: Instantaneous short-circuit protection.
• Electronic trip technology with configurable protection characteristics.
• Separate L, S and I protection functions for improved coordination flexibility.
• Four-pole switching capability for compatible three-phase and neutral distribution systems.
• Manual operating mechanism for circuit switching and resetting.
• 190 mm nominal width for the four-pole XT5 configuration.
• Suitable for low-voltage AC electrical distribution applications.
• Compatible with appropriately selected ABB Tmax XT5 mounting, connection and operating accessories.
• Suitable for outgoing feeders requiring higher current capacity than smaller XT2 and XT4 frame configurations.
• Supports integration into professionally designed electrical distribution and switchboard assemblies.

Advanced Ekip LSI Electronic Protection for High-Capacity Four-Pole Distribution

The ABB EPX-XT5N-E2-3204 incorporates an Ekip LSI electronic trip unit designed to protect higher-current electrical distribution circuits against sustained overloads and short-circuit faults. Electronic protection technology uses current sensing and electronic processing to deliver defined protective characteristics, helping electrical designers achieve suitable protection coordination throughout low-voltage distribution systems.

The L (long-time) protection function responds to sustained excessive current, helping prevent overheating of electrical conductors and connected equipment. The S (short-time) protection function provides delayed short-circuit protection, which can support selectivity with downstream protective devices. The I (instantaneous) protection function responds rapidly to high short-circuit currents, helping minimise the duration of severe electrical faults.

Unlike an LS/I trip unit, which offers a choice between short-time and instantaneous protection, the Ekip LSI arrangement incorporates all three L, S and I protection functions. This provides additional flexibility when coordinating protection across multiple levels of an electrical distribution network, subject to the available settings and the overall system design.

The four-pole construction supports installations where three phase conductors and a neutral conductor must be switched together. This arrangement is particularly useful in compatible three-phase and neutral distribution systems. The neutral pole's protection characteristics and suitability must be verified for the specific circuit breaker configuration and installation requirements.

The ABB SACE Tmax XT5N400 platform provides a robust solution for electrical circuits requiring a 320 A protective device. Its 190 mm nominal four-pole width allows designers to plan the available mounting space within compatible switchboards. For XT5 outgoing devices, additional cableway space may be appropriate where larger power cables are used.

When installing the EPX-XT5N-E2-3204 within an ABB Protecta Power distribution board, appropriate mounting components, terminal connections, cable routing arrangements and protective covers must be selected. Electrical designers should verify prospective fault current, conductor ratings, neutral arrangements, electronic trip settings and protective device coordination before commissioning.

Typical Applications

• ABB Protecta Power electrical distribution boards.
• Commercial low-voltage electrical distribution systems.
• Industrial electrical switchboards and distribution panels.
• 320 A four-pole outgoing feeder protection.
• Three-phase and neutral distribution circuits.
• Building services and mechanical plant distribution.
• Commercial premises and large office building electrical infrastructure.
• Manufacturing and industrial facility electrical installations.
• Commercial switchboards and sub-distribution assemblies.
• Electrical panel building and switchboard manufacturing.
• Higher-capacity electrical feeders requiring electronic LSI protection.
• Electrical installations requiring coordinated upstream and downstream protective devices.