Why Choose the ABB EPX-XT5S-TM3204 320A 4-Pole MCCB?
The ABB EPX-XT5S-TM3204 is a 320 A, 4-pole moulded case circuit breaker (MCCB) with a specified 50 kA breaking capacity and TMA thermal-magnetic protection. Belonging to the ABB Protecta Power Devices product group, this circuit breaker is designed for low-voltage electrical distribution applications requiring overload and short-circuit protection.
The EPX-XT5S-TM3204 combines a 320 A current rating with a four-pole configuration, making it suitable for appropriately designed three-phase, four-wire distribution systems. Its TMA thermal-magnetic protection arrangement combines thermal overload protection with magnetic short-circuit protection, supporting the protection of electrical circuits and connected equipment.
With its specified 50 kA breaking capacity, the EPX-XT5S-TM3204 is intended for applications where the prospective fault current and operating conditions are compatible with the circuit breaker's verified performance. Identified by ABB order code 1SDX255134R1, it provides a manufacturer-specific MCCB solution for electrical contractors, panel builders, consulting engineers and maintenance professionals working with compatible ABB Protecta Power distribution equipment.
Key Advantages
- Genuine ABB Protecta Power Devices moulded case circuit breaker.
- 320 A rated current for appropriately designed low-voltage distribution circuits.
- 4-pole configuration for suitable three-phase, four-wire electrical systems.
- 50 kA specified breaking capacity for applications with compatible prospective fault levels.
- TMA thermal-magnetic protection combines overload and short-circuit protection functions.
- Supports coordinated electrical protection in industrial and commercial distribution systems.
- Provides a four-pole switching arrangement for applications requiring the corresponding circuit configuration.
- Designed for integration into compatible ABB electrical distribution assemblies.
- Suitable for professional electrical panel building and switchgear applications.
- ABB order code 1SDX255134R1 enables accurate identification, specification and procurement.
Key Features
- ABB Protecta Power Devices product group.
- EPX-XT5S-TM3204 manufacturer product designation.
- ABB order code 1SDX255134R1.
- Moulded case circuit breaker (MCCB) construction.
- XT5S breaker designation.
- 320 A rated current.
- 4-pole configuration.
- 50 kA specified breaking capacity.
- TMA thermal-magnetic trip protection.
- Thermal protection element for sustained overload conditions.
- Magnetic protection element for short-circuit conditions.
- Designed for compatible low-voltage electrical distribution and switchgear assemblies.
Technical Specifications
- Manufacturer: ABB
- Product group: Protecta Power Devices
- Model: EPX-XT5S-TM3204
- ABB order code: 1SDX255134R1
- Product designation: EPX-XT5S-TM3204 320A 4P 50kA MCCB - TMA
- Product type: Moulded case circuit breaker (MCCB)
- Product category: Low-voltage circuit protection devices
- Breaker designation: XT5S
- Rated current: 320 A
- Number of poles: 4
- Specified breaking capacity: 50 kA
- Trip unit designation: TMA
- Protection technology: Thermal-magnetic
- Overload protection: Thermal protection element
- Short-circuit protection: Magnetic protection element
- Electrical application: Low-voltage power distribution circuit protection
- Typical system arrangement: Appropriately designed three-phase, four-wire distribution circuits
- Installation application: Compatible electrical distribution boards and switchgear assemblies
- Suitable for: Appropriately configured ABB Protecta Power distribution systems
- Product classification: 320 A 4-pole thermal-magnetic MCCB
320A Four-Pole Thermal-Magnetic Protection with 50kA Breaking Capacity
Industrial and commercial electrical distribution systems require circuit breakers capable of protecting electrical conductors and equipment against abnormal current conditions. The ABB EPX-XT5S-TM3204 provides a 320 A, four-pole MCCB configuration with TMA thermal-magnetic protection for appropriately engineered low-voltage installations.
The thermal protection element responds to sustained overload currents that can cause excessive heating of electrical conductors and connected equipment. The magnetic protection element responds to short-circuit conditions involving high fault currents. Together, these protection functions provide overcurrent protection according to the circuit breaker's applicable operating characteristics.
The four-pole configuration is relevant to three-phase, four-wire distribution arrangements where a fourth switched pole is required. The precise neutral-pole protection and switching characteristics must be verified from the applicable ABB technical documentation. A four-pole designation alone does not establish the neutral protection settings or suitability for every earthing arrangement.
The specified 50 kA breaking capacity is a critical consideration when selecting the MCCB for an electrical distribution system. The prospective short-circuit current at the installation point must be calculated or otherwise established, and the relevant breaking-capacity rating must be checked against the system operating voltage and ABB product data. The stated 50 kA value should not be assumed to apply identically at every voltage or under every installation condition.
The EPX-XT5S-TM3204 should be selected with consideration for conductor sizing, continuous load, installation conditions, protective device coordination and the electrical characteristics of the complete distribution assembly. Relevant requirements of BS EN IEC 60947-2 should be considered for circuit breaker selection, while any applicable BS EN IEC 61439 compliance must be established for the complete verified switchgear assembly rather than assumed from the individual MCCB.
Typical Applications
- ABB Protecta Power electrical distribution assemblies.
- Industrial low-voltage electrical distribution boards.
- Commercial building three-phase power distribution.
- Four-pole feeder circuit protection where the configuration is appropriate.
- Electrical panel boards and switchgear assemblies.
- Manufacturing plant electrical distribution systems.
- Electrical plant rooms and power distribution installations.
- Infrastructure and large commercial electrical installations.
- OEM electrical panel building and switchboard manufacturing.
- Electrical distribution upgrades and compatible MCCB replacement projects.
