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1SDX254938R1 ABB EPX-XT2S-TM0503 50A 3-Pole 50kA TMA Thermal-Magnetic MCCB
ABB EPX-XT2S-TM0503 is a 50 A three-pole 50 kA moulded case circuit breaker from the Protecta Power Devices range, featuring TMA adjustable thermal-magnetic overload and short-circuit protection for low-voltage electrical distribution systems.
£451.41
Why Choose the ABB EPX-XT2S-TM0503 50A 3-Pole 50kA MCCB?
The ABB EPX-XT2S-TM0503 is a high-performance 50 A three-pole moulded case circuit breaker (MCCB) designed to deliver reliable overload and short-circuit protection in low-voltage electrical distribution systems. Part of the ABB Protecta Power Devices range, this circuit breaker uses the established ABB SACE Tmax XT2S platform, combining compact construction, thermal-magnetic protection technology and substantial fault interruption capability for commercial and industrial installations.
Featuring an ABB TMA thermal-magnetic trip unit, the EPX-XT2S-TM0503 provides adjustable thermal overload protection and magnetic short-circuit protection. The thermal element responds to sustained excessive current, helping protect cables and connected equipment against overheating, while the magnetic element provides rapid interruption during short-circuit conditions. This conventional protection technology offers dependable operation without requiring an electronic trip unit or external auxiliary power supply.
With a rated current of 50 A, a three-pole configuration and a specified 50 kA short-circuit breaking capacity, this MCCB is suitable for protecting three-phase outgoing circuits in electrical distribution systems with significant prospective fault currents. Its compact 90 mm-wide XT2 frame supports integration into compatible ABB Protecta Power distribution boards, making it a practical choice for electrical contractors, panel builders and maintenance engineers.
Key Advantages
- 50 A rated current: Suitable for protecting appropriately designed low-voltage electrical distribution circuits.
- Three-pole construction: Provides coordinated switching and protection of three phase conductors.
- 50 kA breaking capacity: Offers substantial short-circuit interruption capability for installations with elevated prospective fault currents.
- ABB TMA thermal-magnetic protection: Combines overload and short-circuit protection in one compact circuit breaker.
- Adjustable thermal protection: Allows the overload protection threshold to be coordinated with circuit requirements.
- Adjustable magnetic protection: Supports appropriate selection of short-circuit trip characteristics.
- Rapid fault interruption: Magnetic tripping responds to high-current short-circuit conditions.
- No electronic trip supply required: Thermal-magnetic protection operates through mechanical and electromagnetic principles.
- ABB Tmax XT2S platform: Uses established ABB circuit breaker technology for dependable electrical protection.
- Compact 90 mm construction: Helps optimise space within compatible distribution boards and control panels.
- Protecta Power integration: Designed for use in appropriately configured ABB Protecta Power distribution assemblies.
- Versatile installation: Suitable for commercial distribution, industrial panels and building infrastructure.
Key Features
- Manufacturer: ABB.
- Product group: Protecta Power Devices.
- Circuit breaker series: ABB SACE Tmax XT2.
- Frame designation: XT2S.
- Rated current: 50 A.
- Number of poles: 3.
- Specified short-circuit breaking capacity: 50 kA.
- Trip unit: ABB TMA thermal-magnetic.
- Thermal protection: Adjustable overload protection.
- Magnetic protection: Adjustable short-circuit protection.
- XT2 frame class: 160 A.
- Thermal adjustment range for the corresponding XT2S TMA 50 A configuration: 35–50 A.
- Magnetic adjustment range for the corresponding XT2S TMA 50 A configuration: 250–500 A.
- Three-pole switching: Simultaneous operation of three phase conductors.
- Nominal device width: 90 mm.
- Operating mechanism: Manual front-operated toggle mechanism.
- Trip indication: Mechanical operating mechanism indicates a tripped condition.
- Accessory compatibility: Supports appropriately selected ABB Tmax XT2 mounting, connection and operating accessories.
- Product family standard: IEC/EN 60947-2.
Reliable TMA Thermal-Magnetic Protection for Electrical Distribution
The ABB EPX-XT2S-TM0503 uses thermal and magnetic trip mechanisms to protect electrical circuits against abnormal current conditions. The thermal protection element responds to sustained overloads, helping prevent excessive heating of conductors and connected equipment. The magnetic protection element responds rapidly when short-circuit current reaches its configured threshold, allowing the breaker to interrupt the circuit and limit the consequences of electrical faults.
The ABB TMA trip unit offers adjustable protection characteristics for the corresponding XT2S 50 A breaker configuration. The thermal protection setting can be selected within the 35–50 A range, while the magnetic trip setting can be adjusted within the 250–500 A range. These adjustments help electrical engineers match circuit protection to conductor capacity, connected loads and fault conditions. Final settings should always be confirmed against the exact supplied breaker and the installation design.
The ABB SACE Tmax XT2S platform combines this protection technology with compact moulded case construction and a high short-circuit performance class. Its specified 50 kA breaking capacity makes it particularly useful for circuits where the prospective short-circuit current exceeds the capability of lower-rated protective devices. The three-pole design is suitable for three-phase circuits, while the compact XT2 frame facilitates installation in compatible ABB Protecta Power distribution boards and switchgear assemblies.
Typical Applications
- ABB Protecta Power distribution boards: Protection of compatible three-phase outgoing circuits.
- Commercial electrical distribution: Circuit protection in offices, retail premises and commercial buildings.
- Industrial switchboards: Protection of suitably rated three-phase distribution feeders.
- Sub-distribution boards: Overload and short-circuit protection for outgoing circuits.
- Electrical control panels: Protection of appropriately designed three-phase equipment supply circuits.
- Building services: Electrical protection for ventilation, heating, cooling and mechanical plant installations.
- Industrial machinery supplies: Feeder protection where thermal-magnetic characteristics are suitable for the connected equipment.
- Warehouses and manufacturing facilities: Protection of low-voltage power distribution circuits.
- High-fault-level installations: Circuits requiring a 50 kA breaking capacity at the applicable operating voltage.
- Electrical panel building: Distribution assemblies incorporating the ABB SACE Tmax XT2 circuit breaker platform.
Technical Specifications
| Product group | Protecta Power Devices |
|---|---|
| Product series | SACE Tmax XT2 |
| Product model | EPX-XT2S-TM0503 |
| ABB order code | 1SDX254938R1 |
| Product type | Moulded case circuit breaker (MCCB) |
| Frame designation | XT2S |
| Frame current class | 160 A |
| Rated current (In) | 50 A |
| Number of poles | 3 |
| Specified short-circuit breaking capacity | 50 kA |
| XT2S series rated ultimate short-circuit breaking capacity (Icu) | 50 kA at 415 V AC |
| XT2S series rated service short-circuit breaking capacity (Ics) | 50 kA at 415 V AC |
| Trip unit technology | Thermal-magnetic |
| Trip unit designation | TMA |
| Overload protection | Adjustable thermal trip |
| Short-circuit protection | Adjustable magnetic trip |
| Thermal adjustment range, corresponding XT2S TMA 50 A configuration | 35–50 A |
| Magnetic adjustment range, corresponding XT2S TMA 50 A configuration | 250–500 A |
| Rated operational voltage (Ue), XT2S series | Up to 690 V AC |
| Rated insulation voltage (Ui), XT2S series | 1000 V |
| Rated impulse withstand voltage (Uimp), XT2S series | 8 kV |
| Electrical system | Low-voltage AC distribution |
| Phase configuration | Three-phase |
| Nominal device width | 90 mm |
| Operating mechanism | Manual toggle operation |
| Primary function | Overload and short-circuit protection |
| Additional function | Circuit switching and isolation in accordance with manufacturer requirements |
| Product family standard | IEC/EN 60947-2 |
Frequently Asked Questions
What is the ABB EPX-XT2S-TM0503 used for?
The ABB EPX-XT2S-TM0503 is a 50 A three-pole thermal-magnetic moulded case circuit breaker designed to protect low-voltage electrical distribution circuits against overloads and short circuits. It is suitable for compatible ABB Protecta Power distribution boards and commercial or industrial electrical panels.
What is the rated current of the EPX-XT2S-TM0503?
The EPX-XT2S-TM0503 has a 50 A rated current and uses the ABB SACE Tmax XT2S 160 A frame platform. The 160 A frame designation identifies the current class of the breaker platform rather than the rated current of this individual device.
What is the breaking capacity of this ABB MCCB?
The EPX-XT2S-TM0503 has a specified 50 kA short-circuit breaking capacity. The ABB XT2S series provides a rated ultimate short-circuit breaking capacity of 50 kA at 415 V AC for the corresponding configuration. The prospective fault current and operating voltage must be verified when selecting the circuit breaker.
What does TMA thermal-magnetic protection mean?
TMA identifies a thermal-magnetic trip unit providing adjustable thermal overload protection and magnetic short-circuit protection. The thermal element responds to sustained excessive current, while the magnetic element enables rapid tripping during short-circuit conditions.
Can the overload and short-circuit settings be adjusted?
Yes. The corresponding ABB XT2S TMA 50 A configuration provides a thermal adjustment range of 35–50 A and a magnetic adjustment range of 250–500 A. The applicable settings should be confirmed for the supplied breaker and selected according to the electrical installation's protection requirements.
What is the difference between ABB XT2N and XT2S circuit breakers?
XT2N and XT2S identify different short-circuit performance versions within the ABB SACE Tmax XT2 family. The corresponding Protecta Power XT2N devices are specified at 36 kA, while XT2S versions provide 50 kA. The appropriate version should be selected according to the prospective fault current and applicable operating voltage.
Is the EPX-XT2S-TM0503 suitable for three-phase electrical systems?
Yes. The EPX-XT2S-TM0503 has a three-pole configuration for switching and protecting three phase conductors. It is suitable for appropriately designed three-phase low-voltage distribution circuits where neutral switching through the breaker is not required.
Can the EPX-XT2S-TM0503 be installed in ABB Protecta Power distribution boards?
Yes. The EPX-XT2S-TM0503 belongs to the ABB Protecta Power Devices range and is intended for integration into compatible distribution assemblies. The correct XT2 mounting arrangement, electrical connections, enclosure compatibility and circuit protection settings should be verified before installation.
Trusted by Electrical Engineers and Distribution Panel Builders
ABB SACE Tmax XT moulded case circuit breakers provide established protection technology for commercial and industrial electrical distribution, combining compact construction, adjustable thermal-magnetic protection and dependable short-circuit interruption capability for modern low-voltage power systems.
