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1SDX255128R1 ABB EPX-XT4S-TM0804 80A 4-Pole 50kA TMA Thermal-Magnetic MCCB
ABB EPX-XT4S-TM0804 is an 80 A four-pole 50 kA moulded case circuit breaker from the Protecta Power Devices range, featuring TMA thermal-magnetic overload and short-circuit protection for low-voltage three-phase electrical distribution systems.
£1,010.94
Why Choose the ABB EPX-XT4S-TM0804 80A 4-Pole 50kA MCCB?
The ABB EPX-XT4S-TM0804 is a high-performance 80 A four-pole moulded case circuit breaker (MCCB) designed to provide reliable overload and short-circuit protection in low-voltage electrical distribution systems. Manufactured by ABB and supplied within the Protecta Power Devices range, this circuit breaker combines the established ABB SACE Tmax XT4S platform with thermal-magnetic protection technology and a specified 50 kA breaking capacity.
Featuring a TMA thermal-magnetic trip unit, the EPX-XT4S-TM0804 provides protection against sustained overloads and short-circuit faults. The thermal protection mechanism responds to excessive current over time, helping prevent overheating of cables and connected electrical equipment. The magnetic protection mechanism responds rapidly to high fault currents, initiating circuit interruption when the applicable magnetic trip threshold is reached. This combination offers dependable circuit protection without requiring an electronic trip unit or an external auxiliary power supply.
With its 80 A rated current and four-pole configuration, the EPX-XT4S-TM0804 is particularly suitable for three-phase electrical distribution systems requiring coordinated switching of the three phase conductors and neutral. The XT4S performance designation identifies a higher short-circuit capability within the Tmax XT4 family, making this MCCB a practical choice for commercial distribution boards, industrial switchgear and compatible ABB Protecta Power electrical assemblies.
Key Advantages
- 80 A rated current: Provides overload and short-circuit protection for appropriately designed low-voltage electrical circuits.
- Four-pole configuration: Supports coordinated switching of three phase conductors and a neutral conductor.
- 50 kA breaking capacity: Offers substantial fault interruption capability for electrical installations with elevated prospective short-circuit currents.
- ABB TMA thermal-magnetic protection: Combines overload and short-circuit protection within a single moulded case circuit breaker.
- Thermal overload protection: Helps protect conductors and connected equipment against sustained excessive current.
- Magnetic short-circuit protection: Provides rapid fault interruption when current reaches the applicable magnetic trip threshold.
- Adjustable protection characteristics: The TMA technology supports protection setting adjustments according to the supplied breaker configuration.
- Independent protective operation: Basic thermal-magnetic protection does not depend on an external electronic power supply.
- ABB SACE Tmax XT4 platform: Uses established ABB circuit breaker technology for reliable electrical distribution protection.
- Protecta Power compatibility: Intended for integration into appropriately configured ABB Protecta Power distribution assemblies.
- Four-pole isolation capability: Supports installations requiring coordinated switching of phase and neutral conductors.
- Robust moulded case construction: Suitable for demanding commercial and industrial electrical environments.
- Flexible installation applications: Appropriate for distribution boards, switchgear assemblies and three-phase equipment supply circuits.
Key Features
- Manufacturer: ABB.
- Product group: Protecta Power Devices.
- Product model: EPX-XT4S-TM0804.
- ABB order code: 1SDX255128R1.
- Circuit breaker family: ABB SACE Tmax XT.
- Frame series: XT4.
- Performance designation: XT4S.
- Rated current: 80 A.
- Number of poles: 4.
- Specified short-circuit breaking capacity: 50 kA.
- Trip unit designation: TMA.
- Trip technology: Thermal-magnetic.
- Overload protection: Thermal trip mechanism.
- Short-circuit protection: Magnetic trip mechanism.
- Four-pole switching: Coordinated operation of three phase conductors and a neutral conductor.
- Operating mechanism: Manual circuit breaker operation.
- Trip indication: Mechanical indication of circuit breaker operating status.
- Accessory compatibility: Supports suitably selected ABB Tmax XT4 accessories, subject to configuration compatibility.
- Installation compatibility: Designed for appropriate ABB Protecta Power distribution board arrangements.
- Product family standard: IEC/EN 60947-2.
Reliable TMA Thermal-Magnetic Protection for Four-Pole Electrical Distribution
The ABB EPX-XT4S-TM0804 provides circuit protection through the combined operation of thermal and magnetic trip mechanisms. The thermal protection element responds to sustained overload conditions according to its time-current characteristics, helping reduce the risk of excessive heating in electrical conductors, terminals and connected equipment. This is particularly important in commercial and industrial installations where distribution circuits must be protected against abnormal operating currents.
The magnetic protection element provides rapid response to short-circuit conditions. When fault current reaches the applicable magnetic trip threshold, the breaker initiates interruption of the affected circuit. The TMA protection arrangement offers conventional thermal-magnetic characteristics, with the exact available adjustments determined by the supplied trip unit. Electrical engineers should confirm the device's thermal and magnetic settings against its markings and manufacturer documentation to ensure suitable cable protection and coordination with other protective devices.
The ABB SACE Tmax XT4S platform combines this protection technology with a specified 50 kA short-circuit breaking capacity, providing a practical solution for electrical installations requiring substantial fault interruption capability. Its four-pole design allows coordinated switching of the three phase conductors and neutral, supporting applications where four-pole isolation is required. The prospective short-circuit current, operating voltage, neutral conductor arrangement and protection coordination should be verified before installation and commissioning.
Typical Applications
- ABB Protecta Power distribution boards: Protection of compatible 80 A four-pole outgoing circuits.
- Commercial electrical distribution: Circuit protection in offices, retail premises and commercial buildings.
- Industrial switchboards: Overload and short-circuit protection for appropriately rated three-phase distribution circuits.
- Sub-distribution boards: Protection of outgoing feeders incorporating a neutral conductor.
- Electrical control panels: Protection of suitably designed three-phase equipment supply circuits.
- Building services installations: Electrical distribution for ventilation, heating, cooling and mechanical plant.
- Manufacturing facilities: Feeder protection for appropriately rated industrial electrical equipment.
- Warehouses and logistics centres: Protection of three-phase low-voltage electrical distribution circuits.
- High-fault-level installations: Circuits requiring 50 kA short-circuit interruption capability at the applicable operating voltage.
- Electrical panel building: Distribution assemblies incorporating compatible ABB SACE Tmax XT4 circuit breakers.
Technical Specifications
| Product group | Protecta Power Devices |
|---|---|
| Product family | SACE Tmax XT |
| Product series | XT4S |
| Product model | EPX-XT4S-TM0804 |
| ABB order code | 1SDX255128R1 |
| Product type | Moulded case circuit breaker (MCCB) |
| Rated current (In) | 80 A |
| Number of poles | 4 |
| Specified short-circuit breaking capacity | 50 kA |
| Trip unit designation | TMA |
| Trip unit technology | Thermal-magnetic |
| Overload protection | Thermal trip mechanism |
| Short-circuit protection | Magnetic trip mechanism |
| Thermal adjustment | According to the supplied TMA trip unit configuration |
| Magnetic adjustment | According to the supplied TMA trip unit configuration |
| Electrical system | Low-voltage AC distribution |
| Phase configuration | Three-phase with neutral |
| Switching configuration | Four-pole |
| Operating method | Manual circuit breaker operation |
| Primary protection functions | 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-XT4S-TM0804 used for?
The ABB EPX-XT4S-TM0804 is an 80 A four-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-XT4S-TM0804?
The EPX-XT4S-TM0804 has a rated current of 80 A. This is the nominal current rating of the circuit breaker and should be considered alongside its thermal protection characteristics, conductor ratings and installation conditions.
What is the breaking capacity of this ABB MCCB?
The EPX-XT4S-TM0804 has a specified 50 kA short-circuit breaking capacity. The applicable operating voltage and manufacturer short-circuit performance conditions must be checked against the prospective fault current at the installation location.
What does TMA thermal-magnetic protection mean?
TMA identifies a thermal-magnetic trip unit combining thermal overload protection with magnetic short-circuit protection. The thermal mechanism responds to sustained excessive current, while the magnetic mechanism provides rapid interruption during short-circuit conditions.
Can the overload and short-circuit settings be adjusted?
ABB TMA thermal-magnetic circuit breakers provide protection adjustment facilities according to their specific trip unit configurations. The exact thermal and magnetic adjustment ranges for the EPX-XT4S-TM0804 should be confirmed from the supplied device's markings and manufacturer technical documentation before commissioning.
What does the four-pole configuration mean?
The four-pole configuration allows coordinated switching of three phase conductors and a neutral conductor. It is suitable for appropriately designed three-phase electrical distribution systems requiring four-pole switching and isolation. The neutral pole's protection characteristics should be verified for the supplied breaker configuration.
What is the difference between ABB XT4N and XT4S circuit breakers?
XT4N and XT4S identify different short-circuit performance versions within the ABB SACE Tmax XT4 family. The corresponding ABB Protecta Power XT4N devices are specified at 36 kA, while XT4S versions are specified at 50 kA. Selection should be based on the prospective fault current and applicable operating voltage.
Can the EPX-XT4S-TM0804 be installed in ABB Protecta Power distribution boards?
Yes. The EPX-XT4S-TM0804 belongs to the ABB Protecta Power Devices range and is intended for integration into compatible distribution assemblies. The correct XT4 mounting arrangement, electrical connections, enclosure compatibility and 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 robust construction, dependable thermal-magnetic operation and substantial short-circuit interruption capability for modern low-voltage power systems.
