Why Choose the ABB EPX-XT5N-TM3204 320A 4-Pole MCCB?
The ABB EPX-XT5N-TM3204 (1SDX253959R1) is a robust and reliable 320 A four-pole moulded case circuit breaker (MCCB) designed to provide overload and short-circuit protection in low-voltage electrical distribution systems. As part of the ABB Protecta Power Devices range, this circuit breaker uses the proven ABB SACE Tmax XT5N platform to deliver dependable circuit protection for commercial buildings, industrial facilities and power distribution assemblies.
Featuring a thermal-magnetic adjustable (TMA) trip unit, the EPX-XT5N-TM3204 combines thermal overload protection with magnetic short-circuit protection. The thermal element responds to sustained overcurrent conditions, while the magnetic element provides rapid tripping during significant fault currents. This protection arrangement helps safeguard electrical cables, distribution equipment and connected installations against the potentially damaging effects of electrical faults.
With a rated current of 320 A, a four-pole configuration and a rated ultimate short-circuit breaking capacity of 36 kA at 415 V AC, the ABB EPX-XT5N-TM3204 is suitable for three-phase distribution circuits requiring simultaneous switching of all four poles. The device uses an XT5N 400 frame with a fully rated neutral pole and is designed for integration into compatible ABB Protecta Power distribution assemblies.
Key Advantages
- High-performance 320 A moulded case circuit breaker for low-voltage electrical distribution.
- Four-pole configuration provides simultaneous switching of three phase conductors and neutral.
- 36 kA ultimate breaking capacity at 415 V AC for protection against high prospective short-circuit currents.
- Reliable TMA thermal-magnetic trip unit provides overload and short-circuit protection.
- Adjustable thermal and magnetic protection supports coordination with electrical installation requirements.
- Based on the proven ABB SACE Tmax XT5N 400 frame.
- Fully rated neutral pole suitable for applications requiring a neutral current rating equal to the phase current rating.
- Designed for integration into compatible ABB Protecta Power distribution boards.
- Fixed-mounted circuit breaker construction supports secure installation within electrical assemblies.
- Suitable for industrial, commercial and infrastructure power distribution applications.
Key Features
- ABB Protecta Power Devices circuit breaker range.
- EPX-XT5N-TM3204 moulded case circuit breaker.
- ABB order code 1SDX253959R1.
- ABB SACE Tmax XT5N 400 circuit breaker platform.
- 320 A rated current.
- Four-pole (4P) configuration.
- 36 kA rated ultimate short-circuit breaking capacity at 415 V AC.
- TMA adjustable thermal-magnetic trip unit.
- Thermal overload protection for sustained overcurrent conditions.
- Magnetic short-circuit protection with an adjustable instantaneous trip threshold.
- 320–3200 A nominal thermal-magnetic trip unit designation.
- 1600–3200 A magnetic trip adjustment range.
- 100% rated neutral pole.
- Fixed-mounted construction with front connection terminals.
- Manual switching and protective tripping functionality.
- Designed for low-voltage AC electrical distribution systems.
- Compatible with suitable ABB Protecta Power outgoing MCCB arrangements.
- Based on the ABB SACE Tmax XT circuit breaker family designed for industrial circuit protection.
Technical Specifications
- Manufacturer: ABB
- Product group: Protecta Power Devices
- Circuit breaker family: SACE Tmax XT
- Frame: XT5N 400
- Model: EPX-XT5N-TM3204
- ABB order code: 1SDX253959R1
- Manufacturer description: EPX-XT5N-TM3204 320A 4P 36kA MCCB - TMA
- Product type: Moulded case circuit breaker (MCCB)
- Rated current (In): 320 A
- Number of poles: 4
- Rated ultimate short-circuit breaking capacity (Icu): 36 kA at 415 V AC
- Breaking capacity class: N
- Trip unit: TMA adjustable thermal-magnetic
- Overload protection: Thermal
- Short-circuit protection: Magnetic
- Magnetic trip adjustment: 1600–3200 A
- Neutral pole rating: 100% of rated current
- Electrical system: Low-voltage AC distribution
- Mounting type: Fixed
- Terminal arrangement: Front terminals
- Operating mechanism: Manual toggle operation with automatic protective tripping
- Applicable circuit breaker standard: IEC/EN 60947-2
- Compatible distribution system: ABB Protecta Power
- Application: Overload and short-circuit protection for three-phase distribution circuits
Reliable Circuit Protection for Low-Voltage Power Distribution
Moulded case circuit breakers are essential components in modern electrical distribution systems, providing protection against excessive current and short-circuit faults. The ABB EPX-XT5N-TM3204 is designed to interrupt fault currents before they cause unacceptable damage to electrical conductors, distribution equipment and connected circuits.
The circuit breaker incorporates a TMA thermal-magnetic trip unit that combines two complementary protection functions. The thermal element provides inverse-time overload protection, allowing the device to respond to sustained overcurrent conditions. The magnetic element provides rapid short-circuit protection, with an adjustable instantaneous trip setting that supports coordination with the electrical installation.
The ABB SACE Tmax XT5N 400 frame provides a robust platform for the 320 A protective device. Its 36 kA breaking capacity at 415 V AC makes it suitable for electrical distribution points where the prospective fault current does not exceed the circuit breaker's rated capability under the applicable operating conditions.
The four-pole configuration allows the three phase conductors and neutral conductor to be switched together. The fully rated neutral pole provides a neutral current rating equal to the phase current rating, making the device suitable for appropriately designed three-phase and neutral distribution systems.
As part of the ABB Protecta Power Devices range, the EPX-XT5N-TM3204 is intended for integration into compatible low-voltage distribution assemblies. The appropriate mounting arrangement, cable connections, protection settings and associated accessories must be selected according to the complete switchboard design and installation requirements.
Typical Applications
- ABB Protecta Power low-voltage distribution boards.
- Three-phase and neutral electrical distribution circuits.
- Commercial building main and sub-main distribution systems.
- Industrial electrical distribution and switchgear assemblies.
- Manufacturing facilities and production plant power distribution.
- Electrical feeder protection for industrial equipment.
- Commercial infrastructure and building services installations.
- Distribution circuits supplying large electrical loads.
- Industrial control panels requiring high-current circuit protection.
- Electrical switchboard manufacturing and panel building.
- Power distribution upgrades and replacement MCCB installations.
- OEM electrical distribution and engineered switchgear systems.
