Why Choose the ABB EPX-XT4S-TM2503 250A 3-Pole 50kA MCCB?
The ABB EPX-XT4S-TM2503 is a high-performance 250 A three-pole moulded case circuit breaker (MCCB) designed to provide dependable overload and short-circuit protection in low-voltage electrical distribution systems. Featuring a 50 kA short-circuit breaking capacity and TMA thermal-magnetic protection, this circuit breaker forms part of the ABB Protecta Power Devices range and incorporates the proven ABB Tmax XT4S circuit breaker platform.
Designed for professional electrical distribution applications, the EPX-XT4S-TM2503 combines reliable switching performance with adjustable thermal-magnetic protection technology. Its TMA trip unit provides thermal overload protection and magnetic short-circuit protection, helping safeguard cables, electrical equipment and distribution circuits against excessive current and fault conditions.
With a rated current of 250 A, a three-pole configuration and a specified 50 kA breaking capacity, the EPX-XT4S-TM2503 is suitable for compatible Protecta Power distribution assemblies serving commercial buildings, industrial facilities and electrical infrastructure. Identified by ABB order code 1SDX254975R1, this MCCB provides a coordinated solution for three-phase outgoing feeder protection and professional low-voltage switchboard construction.
Key Advantages
- High-performance 250 A moulded case circuit breaker for low-voltage power distribution.
- Three-pole (3P) configuration suitable for three-phase electrical circuits.
- 50 kA short-circuit breaking capacity for demanding distribution environments.
- TMA thermal-magnetic trip unit provides overload and short-circuit protection.
- Adjustable thermal and magnetic protection characteristics support application-specific circuit protection.
- Proven ABB Tmax XT4S circuit breaker technology.
- Designed for integration into compatible ABB Protecta Power distribution assemblies.
- Compact moulded case construction supports efficient use of electrical panel space.
- Thermal-magnetic protection provides straightforward operation without requiring an electronic trip unit.
- Suitable for commercial, industrial and building services electrical installations.
Key Features
- ABB Protecta Power Devices product range.
- EPX-XT4S-TM2503 manufacturer product designation.
- 1SDX254975R1 ABB order code.
- XT4S moulded case circuit breaker frame.
- 250 A rated current.
- Three-pole (3P) circuit breaker construction.
- 50 kA short-circuit breaking capacity.
- TMA thermal-magnetic trip protection.
- Adjustable thermal overload protection for sustained overcurrent conditions.
- Adjustable magnetic protection for short-circuit faults.
- Manual switching and protective tripping functionality.
- XT4S platform supports a rated operational voltage of up to 690 V AC, subject to the applicable electrical ratings.
- Designed for installation in compatible low-voltage distribution assemblies.
- Suitable for outgoing feeder protection and three-phase electrical distribution applications.
Technical Specifications
- Manufacturer: ABB
- Product range: Protecta Power Devices
- Circuit breaker family: Tmax XT
- Frame: XT4S
- Model: EPX-XT4S-TM2503
- ABB order code: 1SDX254975R1
- Product type: Moulded case circuit breaker (MCCB)
- Rated current: 250 A
- Number of poles: 3
- Pole configuration: 3P
- Breaking capacity: 50 kA
- Breaking capacity at 415 V AC (XT4S platform): 50 kA
- Trip unit: TMA
- Trip technology: Thermal-magnetic
- Overload protection: Adjustable thermal
- Short-circuit protection: Adjustable magnetic
- Thermal setting range (XT4S 250 TMA): 175–250 A
- Magnetic setting range (XT4S 250 TMA): 1,250–2,500 A
- Rated operational voltage (XT4S platform): Up to 690 V AC
- Rated insulation voltage (XT4S platform): 1,000 V
- Rated impulse withstand voltage (XT4S platform): 8 kV
- Applicable circuit breaker standard: IEC/EN 60947-2
- Installation application: Low-voltage electrical distribution assemblies
- Compatible distribution system: ABB Protecta Power
- Product category: Thermal-magnetic moulded case circuit breakers
Reliable Thermal-Magnetic Protection for Three-Phase Power Distribution
Moulded case circuit breakers protect electrical installations by automatically interrupting current when overload or short-circuit conditions occur. Thermal-magnetic MCCBs combine two complementary protective mechanisms: a thermal element that responds to sustained overload currents and a magnetic element that operates rapidly when high short-circuit currents are detected.
The ABB EPX-XT4S-TM2503 incorporates TMA thermal-magnetic protection, providing adjustable overload and short-circuit protection within a compact three-pole circuit breaker. The thermal protection function helps prevent prolonged overcurrent conditions from damaging cables and connected equipment, while the magnetic protection function provides rapid interruption of severe electrical faults.
The ABB Tmax XT4S platform is developed for dependable switching and circuit protection in low-voltage distribution systems. Its combination of robust moulded case construction, adjustable thermal-magnetic protection and high short-circuit interruption performance makes it suitable for industrial and commercial electrical distribution applications.
As part of the ABB Protecta Power Devices range, the EPX-XT4S-TM2503 is intended for integration into compatible Protecta Power panelboard configurations. Correct installation requires verification of the prospective short-circuit current, appropriate conductor sizing, protection settings and coordination with upstream and downstream protective devices. The specified 50 kA breaking capacity must be assessed at the relevant operating voltage and in accordance with the manufacturer's rating conditions.
Typical Applications
- ABB Protecta Power low-voltage electrical distribution panelboards.
- Three-phase outgoing feeder protection.
- Electrical distribution circuits requiring 250 A MCCB protection.
- Commercial building main and sub-distribution systems.
- Industrial electrical power distribution installations.
- Manufacturing facilities and production equipment distribution circuits.
- Building services electrical infrastructure.
- Distribution systems requiring high short-circuit breaking performance.
- Electrical switchboard manufacturing and panel building.
- OEM power distribution assemblies and electrical system integration.
