Why Choose the ABB EPX-XT4S-TM0504 50A 4-Pole MCCB?
The ABB EPX-XT4S-TM0504 is a robust and reliable 50 A 4-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 product group, this circuit breaker features an XT4S frame with a thermal-magnetic adjustable (TMA) trip unit, making it suitable for commercial buildings, industrial facilities and electrical distribution assemblies.
The EPX-XT4S-TM0504 combines thermal overload protection with adjustable magnetic short-circuit protection to help safeguard electrical circuits, cables and connected equipment against damaging fault conditions. Its four-pole construction enables the switching of three-phase circuits incorporating a neutral conductor, making it particularly suitable for low-voltage power distribution systems requiring four-pole circuit isolation.
With a 50 A rated current, 50 kA short-circuit breaking capacity and 4-pole configuration, the ABB EPX-XT4S-TM0504 provides effective circuit protection for appropriately designed electrical installations. Its XT4S construction supports integration into compatible ABB Protecta Power distribution boards, switchgear assemblies and industrial electrical panels.
Key Advantages
- Reliable 50 A moulded case circuit breaker for low-voltage electrical distribution.
- 4-pole configuration suitable for three-phase electrical systems incorporating a neutral conductor.
- 50 kA short-circuit breaking capacity for demanding electrical protection applications.
- Integrated thermal-magnetic adjustable (TMA) trip unit for overload and short-circuit protection.
- Robust ABB XT4S frame designed for dependable circuit protection in electrical distribution assemblies.
- Adjustable thermal protection supports coordination with the protected circuit's operating requirements.
- Adjustable magnetic protection enables short-circuit trip settings to be selected within the supported range.
- Manual switching mechanism supports circuit isolation and resetting following a protective trip.
- Suitable for integration into compatible ABB Protecta Power distribution systems.
- Durable moulded case construction supports reliable operation in commercial and industrial environments.
Key Features
- ABB Protecta Power Devices product group.
- EPX-XT4S-TM0504 moulded case circuit breaker.
- XT4S frame for low-voltage circuit protection.
- 50 A rated current.
- 4-pole circuit breaker configuration.
- 50 kA short-circuit breaking capacity.
- TMA thermal-magnetic adjustable trip unit.
- Adjustable thermal overload protection for sustained overcurrent conditions.
- Adjustable magnetic short-circuit protection for high fault currents.
- Manual operating mechanism with circuit breaker position indication.
- Four-pole construction suitable for three-phase distribution circuits with a neutral conductor.
- Designed for integration into compatible low-voltage electrical distribution boards and switchgear assemblies.
- Suitable for commercial, industrial and building electrical distribution applications.
Technical Specifications
- Manufacturer: ABB
- Product group: Protecta Power Devices
- Series / Frame: XT4S
- Model: EPX-XT4S-TM0504
- ABB order code: 1SDX255126R1
- Product type: Moulded case circuit breaker (MCCB)
- Rated current: 50 A
- Number of poles: 4
- Short-circuit breaking capacity: 50 kA
- Rated ultimate short-circuit breaking capacity (Icu): 50 kA at 415 V AC
- Trip unit: TMA – Thermal Magnetic Adjustable
- Overload protection: Adjustable thermal trip protection
- Short-circuit protection: Adjustable magnetic trip protection
- Thermal adjustment range: 35–50 A
- Magnetic trip adjustment range: 250–500 A
- Rated operational voltage: Up to 690 V AC
- Rated insulation voltage (Ui): 1000 V
- Rated impulse withstand voltage (Uimp): 8 kV
- Applicable standard: IEC 60947-2
- Application: Low-voltage electrical distribution
- Operating mechanism: Manual toggle operation
- Construction: Moulded case
- Mounting application: Compatible electrical distribution boards and switchgear assemblies
- Installation environment: Enclosed low-voltage electrical distribution equipment
- Product classification: Low-voltage circuit protection device
Reliable Circuit Protection for Low-Voltage Electrical Systems
Moulded case circuit breakers such as the ABB EPX-XT4S-TM0504 are essential components in modern electrical distribution installations. They automatically interrupt electrical circuits when overload or short-circuit conditions occur, helping reduce the risk of damage to electrical cables, distribution equipment and connected loads while supporting dependable electrical operation.
The TMA thermal-magnetic trip unit combines two complementary protection functions. The thermal element responds to sustained overload currents, while the magnetic element operates during significant short-circuit conditions. Adjustable protection settings allow electrical engineers to configure the circuit breaker within its specified operating ranges to suit the protected installation.
The 50 A four-pole XT4S configuration is particularly suitable for three-phase electrical distribution systems incorporating a neutral conductor. Its robust construction supports installation within compatible electrical panels, while the specified 50 kA breaking capacity at 415 V AC provides substantial short-circuit interruption capability for appropriately designed low-voltage systems.
As part of the ABB Protecta Power Devices range, the EPX-XT4S-TM0504 is intended for integration into compatible electrical distribution equipment. Electrical engineers and installers can use this circuit breaker in commercial and industrial applications where reliable circuit protection, four-pole isolation and adjustable overcurrent protection are required.
Correct selection and installation should consider the electrical system voltage, prospective short-circuit current, conductor sizing, protective device coordination and applicable wiring regulations. Thermal and magnetic trip settings should be selected by a competent electrical professional to ensure suitable protection for the connected circuit.
Typical Applications
- Low-voltage electrical distribution boards.
- ABB Protecta Power distribution assemblies.
- Commercial building electrical installations.
- Industrial power distribution systems.
- Three-phase distribution circuits with neutral conductors.
- Electrical switchboards and control panels.
- Sub-distribution boards and outgoing feeder circuits.
- Manufacturing plants and production facilities.
- Warehouses, offices and commercial premises.
- Building services and electrical infrastructure installations.
- Electrical systems requiring 50 A four-pole circuit protection.
