Why Choose the ABB EPX-XT4N-TM0403 40A 3-Pole MCCB?
The ABB EPX-XT4N-TM0403 is a 40 A, 3-pole moulded case circuit breaker (MCCB) with a specified 36 kA breaking capacity and TMA thermal-magnetic protection. Belonging to the ABB Protecta Power Devices product group, this circuit breaker is designed for low-voltage electrical distribution applications requiring three-pole circuit protection against overloads and short circuits.
The EPX-XT4N-TM0403 combines a 40 A current rating with a three-pole switching arrangement, making it suitable for appropriately designed three-phase electrical distribution circuits. Its thermal-magnetic trip technology provides overload protection through a thermal element and short-circuit protection through a magnetic element, supporting coordinated electrical protection within compatible distribution systems.
Identified by ABB order code 1SDX253479R1, the EPX-XT4N-TM0403 is specified as a 36 kA MCCB with TMA protection. It is intended for electrical contractors, panel builders, consulting engineers and maintenance professionals requiring a manufacturer-specific circuit breaker for compatible ABB Protecta Power installations.
Key Advantages
- Genuine ABB Protecta Power Devices moulded case circuit breaker.
- 40 A rated current for appropriately designed low-voltage distribution circuits.
- 3-pole configuration for three-phase electrical circuit protection.
- 36 kA specified breaking capacity for suitable fault-level applications.
- TMA thermal-magnetic protection combines overload and short-circuit protection functions.
- Supports the protection of electrical distribution circuits and connected equipment.
- Suitable for integration into compatible ABB electrical distribution assemblies.
- Supports coordinated circuit protection in industrial and commercial installations.
- Designed for professional electrical panel building and distribution board applications.
- ABB order code 1SDX253479R1 enables accurate identification, specification and procurement.
Key Features
- ABB Protecta Power Devices product group.
- EPX-XT4N-TM0403 manufacturer product designation.
- ABB order code 1SDX253479R1.
- Moulded case circuit breaker (MCCB) construction.
- 40 A rated current.
- 3 poles for three-phase circuit protection.
- 36 kA breaking capacity as specified for the product.
- TMA thermal-magnetic trip protection.
- Provides thermal overload protection and magnetic short-circuit protection.
- Designed for low-voltage electrical distribution applications.
- Suitable for compatible ABB Protecta Power distribution equipment.
- Intended for professional circuit protection and electrical panel assembly.
Technical Specifications
- Manufacturer: ABB
- Product group: Protecta Power Devices
- Model: EPX-XT4N-TM0403
- ABB order code: 1SDX253479R1
- Product designation: EPX-XT4N-TM0403 40A 3P 36kA MCCB - TMA
- Product type: Moulded case circuit breaker (MCCB)
- Product category: Low-voltage circuit protection devices
- Breaker designation: XT4N
- Rated current: 40 A
- Number of poles: 3
- Specified breaking capacity: 36 kA
- Trip unit designation: TMA
- Protection technology: Thermal-magnetic
- Overload protection: Thermal protection element
- Short-circuit protection: Magnetic protection element
- Electrical application: Three-phase low-voltage circuit protection
- Installation application: Compatible electrical distribution boards and switchgear assemblies
- Suitable for: Appropriately configured ABB Protecta Power distribution systems
- Product classification: 40 A 3-pole thermal-magnetic MCCB
40A Thermal-Magnetic Circuit Protection with 36kA Breaking Capacity
Low-voltage electrical distribution systems require appropriately selected protective devices to reduce the risks associated with overload currents and short-circuit faults. The ABB EPX-XT4N-TM0403 provides a 40 A, three-pole MCCB configuration with TMA thermal-magnetic protection for suitable industrial and commercial electrical installations.
The thermal protection element responds to sustained overload conditions, while the magnetic protection element provides a response to high fault currents associated with short circuits. These complementary protection functions allow a thermal-magnetic MCCB to protect appropriately designed electrical circuits against different overcurrent conditions.
The specified 36 kA breaking capacity is an important consideration when selecting the breaker for an electrical distribution system. The prospective short-circuit current at the installation point must be assessed, and the applicable breaking-capacity rating must be verified against the system voltage and relevant ABB technical data. The stated breaking capacity should not be assumed to apply identically at every operating voltage.
The three-pole configuration enables the breaker to protect and interrupt the three phase conductors of a suitable electrical circuit. The EPX-XT4N-TM0403 should be selected with consideration for conductor sizing, load characteristics, protective device coordination, installation conditions and the requirements of the completed electrical distribution assembly.
As part of the ABB Protecta Power Devices range, the EPX-XT4N-TM0403 should be installed in accordance with the relevant ABB technical documentation. The final installation must satisfy applicable electrical safety requirements, including the relevant provisions of BS EN IEC 60947-2 for circuit breakers and BS EN IEC 61439 where the device forms part of a low-voltage switchgear assembly.
Typical Applications
- ABB Protecta Power electrical distribution assemblies.
- Industrial low-voltage electrical distribution boards.
- Commercial building three-phase circuit protection.
- Electrical panel boards and switchgear assemblies.
- Manufacturing plant electrical distribution systems.
- Three-phase feeder circuit protection.
- Electrical plant rooms and distribution equipment installations.
- Machinery supply circuits where the protective characteristics are suitable.
- OEM electrical panel building and switchboard manufacturing.
- Electrical distribution system upgrades and circuit breaker replacement projects.
