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1SDX254961R1 ABB EPX-XT4S-TM0403 40A 3-Pole 50kA TMA MCCB
ABB EPX-XT4S-TM0403 is a 40 A three-pole moulded case circuit breaker with 50 kA breaking capacity and a thermal-magnetic adjustable trip unit, designed for overload and short-circuit protection in low-voltage electrical distribution systems.
£678.40
Why Choose the ABB EPX-XT4S-TM0403 40A 3-Pole MCCB?
The ABB EPX-XT4S-TM0403 is a reliable 40 A, 3-pole moulded case circuit breaker (MCCB) designed to protect electrical distribution circuits against overloads and short circuits. Featuring a 50 kA breaking capacity and a thermal-magnetic adjustable (TMA) trip unit, this circuit breaker provides dependable protection for commercial and industrial low-voltage electrical installations.
As part of the ABB Protecta Power Devices range, incorporating SACE Tmax XT4 circuit breaker technology, the EPX-XT4S-TM0403 combines robust construction with effective circuit protection. Its thermal-magnetic release provides overload protection through a thermal element and short-circuit protection through a magnetic element, helping minimise equipment damage and electrical system downtime.
With a 40 A rated current, three-pole configuration and 50 kA short-circuit breaking capacity, this MCCB is suitable for three-phase distribution circuits in switchboards, distribution boards and industrial control panels. Its compact XT4 frame design makes it particularly useful for installations requiring reliable protection and efficient use of panel space.
Key Advantages
- 40 A rated current for protecting low-voltage distribution circuits.
- 50 kA breaking capacity for installations with significant prospective short-circuit currents.
- Three-pole construction provides simultaneous switching and protection of three-phase circuits.
- Thermal-magnetic adjustable (TMA) trip unit provides overload and short-circuit protection.
- ABB SACE Tmax XT4S technology offers dependable electrical protection and switching performance.
- Compact moulded case construction supports efficient installation within electrical distribution assemblies.
- Suitable for integration into ABB Protecta Power distribution systems.
- Mechanical switching and protective tripping functions help improve electrical system reliability.
Key Features
- ABB Protecta Power Devices circuit protection product.
- SACE Tmax XT4S moulded case circuit breaker platform.
- 40 A rated operational current.
- 50 kA rated short-circuit breaking capacity at the applicable specified voltage.
- 3-pole configuration for three-phase electrical distribution.
- TMA thermal-magnetic trip unit for overload and instantaneous short-circuit protection.
- Adjustable protection characteristics support coordination with installation requirements.
- Compact XT4 frame suitable for low-voltage switchgear assemblies.
- Designed for electrical distribution applications in commercial and industrial environments.
- Compatible with appropriate ABB Tmax XT accessories and installation arrangements.
Reliable Thermal-Magnetic Protection for Electrical Distribution
The ABB EPX-XT4S-TM0403 provides two essential protection functions through its thermal-magnetic trip unit. The thermal protection element responds to sustained overload conditions, while the magnetic protection element provides rapid tripping during high-current short-circuit faults. These functions help protect electrical cables, distribution equipment and connected installations against damaging fault conditions.
The 50 kA breaking capacity enables the circuit breaker to interrupt substantial prospective short-circuit currents when applied within its specified ratings. Combined with its three-pole construction and adjustable thermal-magnetic protection, the XT4S design supports reliable circuit isolation, fault protection and electrical distribution system coordination.
Typical Applications
- Commercial and industrial low-voltage distribution boards.
- ABB Protecta Power electrical distribution assemblies.
- Three-phase electrical distribution circuits.
- Industrial machinery and equipment supply circuits.
- Electrical switchboards and control panels.
- Building services and infrastructure electrical installations.
- Manufacturing facilities and industrial power distribution systems.
- Sub-distribution circuits requiring thermal-magnetic overload and short-circuit protection.
Technical Specifications
| Product range | Protecta Power Devices |
|---|---|
| Series | SACE Tmax XT4S |
| ABB order code | 1SDX254961R1 |
| Product type | Moulded case circuit breaker (MCCB) |
| Rated current | 40 A |
| Number of poles | 3 |
| Breaking capacity | 50 kA |
| Trip unit type | TMA – thermal-magnetic adjustable |
| Protection functions | Overload and short-circuit protection |
| Frame family | XT4 |
| Frame designation | XT4S160 |
| Switching mechanism | Mechanical circuit breaker |
| Application | Low-voltage electrical distribution |
| Applicable standard | IEC 60947-2 |
| Product group | Protecta Power Devices |
Frequently Asked Questions
What is the ABB EPX-XT4S-TM0403 used for?
The ABB EPX-XT4S-TM0403 is a moulded case circuit breaker designed to protect three-phase low-voltage electrical distribution circuits against overloads and short circuits.
What is the rated current of this MCCB?
The EPX-XT4S-TM0403 has a 40 A rated current, making it suitable for appropriately designed electrical distribution circuits requiring this current rating.
What is the breaking capacity of the EPX-XT4S-TM0403?
This MCCB has a specified 50 kA breaking capacity. The applicable voltage and installation conditions must be checked against the manufacturer's ratings when selecting the breaker.
What does TMA mean on this ABB circuit breaker?
TMA stands for thermal-magnetic adjustable. The trip unit provides thermal overload protection and magnetic short-circuit protection, with adjustable protection characteristics for coordination with the electrical installation.
Where is the ABB EPX-XT4S-TM0403 typically installed?
The circuit breaker is typically installed in low-voltage distribution boards, switchboards and electrical control panels, including suitable ABB Protecta Power distribution assemblies.
Trusted ABB Circuit Protection Technology
ABB SACE Tmax XT moulded case circuit breakers are designed to deliver reliable overload and short-circuit protection in low-voltage electrical distribution systems. The EPX-XT4S-TM0403 combines a 40 A rating, three-pole construction, 50 kA breaking capacity and thermal-magnetic adjustable protection for dependable commercial and industrial electrical installations.
