1SDX248644R1 ABB EPX-XT5S-TM4004 Protecta Power XT5S 400A 4-Pole 50kA TMA MCCB

Why Choose the ABB EPX-XT5S-TM4004 400A 4-Pole 50kA MCCB with TMA Protection?

The ABB EPX-XT5S-TM4004 is a 400 A, four-pole moulded case circuit breaker (MCCB) designed for low-voltage electrical distribution applications requiring reliable overload and short-circuit protection. Part of the ABB Tmax XT5S circuit breaker family and the Protecta Power Devices range, this MCCB combines a substantial current rating with a 50 kA breaking capacity and thermal-magnetic protection.

Featuring a TMA thermal-magnetic trip unit, the EPX-XT5S-TM4004 provides protection against sustained overload conditions and short-circuit faults. Its thermal protection element responds to excessive current over time, while the magnetic element provides rapid tripping during high fault current conditions. This combination makes the device suitable for protecting distribution circuits, electrical conductors and connected equipment in appropriately designed installations.

The four-pole configuration makes the EPX-XT5S-TM4004 suitable for three-phase distribution arrangements requiring a fourth switched pole. Its 400 A rated current and XT5S frame construction support integration into compatible ABB Protecta Power distribution assemblies, providing a practical solution for commercial and industrial electrical infrastructure.

Key Advantages

• 400 A rated current for substantial low-voltage distribution loads.
• Four-pole construction supports applications requiring switching of three phases and a fourth conductor.
• 50 kA breaking capacity for appropriately designed distribution systems with significant prospective fault currents.
• TMA thermal-magnetic protection provides overload and short-circuit protection.
• ABB Tmax XT5S platform offers established moulded case circuit breaker technology.
• Protecta Power compatibility supports integration into designated ABB electrical distribution assemblies.
• Mechanical switching capability allows manual opening, closing and resetting of the circuit breaker.
• Four-pole circuit isolation supports suitable three-phase distribution arrangements.
• Suitable for commercial, industrial and building services electrical installations.

Key Features

• ABB Protecta Power Devices range.
• ABB Tmax XT5S moulded case circuit breaker.
• 400 A rated current.
• Four-pole configuration.
• 50 kA specified breaking capacity.
• TMA thermal-magnetic trip technology.
• Thermal overload protection against sustained overcurrent conditions.
• Magnetic short-circuit protection against high fault currents.
• Common circuit breaker operating mechanism for multi-pole switching.
• Manual operation and resetting following a protective trip.
• Suitable for integration into compatible ABB Protecta Power distribution equipment.
• Designed for three-phase low-voltage electrical distribution applications.
• ABB manufacturer order code 1SDX248644R1.

Thermal-Magnetic Circuit Protection for Three-Phase Distribution

The ABB EPX-XT5S-TM4004 provides circuit protection for low-voltage distribution systems operating at currents up to its specified 400 A rating. The TMA trip unit combines thermal protection against prolonged overloads with magnetic protection against short-circuit faults. These complementary functions help limit the effects of overcurrent conditions on cables, distribution equipment and connected electrical loads.

Its four-pole configuration is particularly relevant where the electrical design requires a fourth switched conductor alongside the three phases. The 50 kA breaking capacity provides a significant short-circuit protection capability, although the applicable rating must be confirmed at the installation voltage. Designers and installers should also verify conductor sizing, protective coordination, neutral-pole requirements, terminal arrangements and compatibility with the intended ABB Protecta Power assembly.

Typical Applications

• ABB Protecta Power electrical distribution assemblies.
• Commercial and industrial low-voltage distribution boards.
• Three-phase electrical systems requiring four-pole switching.
• Main and sub-main distribution circuit protection.
• Industrial manufacturing facilities and production environments.
• Commercial buildings, warehouses and logistics centres.
• Electrical plant rooms and building services installations.
• Distribution feeders supplying industrial machinery and equipment.
• Panel building projects requiring 400 A four-pole MCCB protection.
• Electrical distribution installations requiring a 50 kA thermal-magnetic MCCB.