Why Choose the ABB XT5N 400 TMA 400-4000 4-Pole Moulded Case Circuit Breaker?
The ABB 1SDA100384R1 is a high-performance 400 A four-pole moulded case circuit breaker (MCCB) from the ABB SACE Tmax XT range. Its full manufacturer designation is XT5N 400 TMA 400-4000 4p F F InN=50%In. Designed for industrial and commercial low-voltage electrical distribution, it combines a 400 A rated current, adjustable thermomagnetic protection and a four-pole configuration with a 50% rated neutral.
Equipped with ABB's TMA thermomagnetic trip unit, the circuit breaker provides thermal overload protection and instantaneous magnetic short-circuit protection. Its thermal adjustment range is 160–400 A, while the magnetic protection threshold can be adjusted from 2000–4000 A. These adjustable settings allow the protection characteristics to be selected according to the requirements of the electrical installation.
The four-pole configuration provides switching of three phase conductors and a neutral conductor. The designation InN=50%In identifies a neutral protection rating equivalent to 50% of the phase rated current. For this 400 A model, that corresponds to a 200 A neutral rating. This configuration is suitable for appropriately designed three-phase systems where the expected neutral current remains within the permitted rating.
The XT5N designation identifies the normal breaking-capacity version of ABB's XT5 circuit breaker family. The model provides a 36 kA rated ultimate short-circuit breaking capacity at 415 V AC, making it suitable for installations where the prospective fault current is within the circuit breaker's published ratings.
Supplied in a fixed-mounted configuration with front terminals, the ABB XT5N 400 TMA is designed for integration into distribution boards, industrial switchboards and electrical control assemblies. Its compact dimensions of 205 × 186 × 103.5 mm and robust moulded case construction support reliable circuit protection in demanding electrical installations.
Key Advantages
- 400 A rated current for industrial and commercial power distribution.
- ABB SACE Tmax XT5 frame provides a robust platform for electrical circuit protection.
- TMA thermomagnetic release combines overload and short-circuit protection.
- Adjustable thermal overload protection from 160–400 A.
- Adjustable instantaneous magnetic protection from 2000–4000 A.
- Four-pole configuration provides switching of three phases and neutral.
- 50% rated neutral supports suitable three-phase distribution systems with controlled neutral loading.
- 36 kA breaking capacity at 415 V AC for appropriately rated electrical installations.
- Fixed-mounted construction supports permanent installation in switchboards.
- Front terminal connections facilitate integration into suitable panel layouts.
- Manual toggle operation provides clear ON, OFF and tripped-state control.
- Integrated automatic circuit protection responds to overload and short-circuit conditions.
- AC and DC application capability within ABB's published ratings.
- Compact moulded case construction helps optimise available panel space.
- Compatible with selected ABB XT5 accessories for additional operating and signalling functions.
- ABB industrial circuit breaker technology designed for professional electrical distribution systems.
Key Features
- ABB SACE Tmax XT series.
- XT5 frame family.
- XT5N normal breaking-capacity version.
- 400 A rated current.
- Four-pole (4P) construction.
- Neutral rating: InN=50%In.
- 200 A equivalent neutral rating.
- TMA thermomagnetic trip unit.
- Adjustable thermal protection: 160–400 A.
- Adjustable instantaneous magnetic protection: 2000–4000 A.
- 36 kA Icu at 415 V AC.
- 36 kA Ics at 415 V AC.
- Rated operational voltage up to 690 V AC.
- Rated insulation voltage of 1000 V.
- Rated impulse withstand voltage of 8 kV.
- Fixed-mounted configuration.
- Front terminal connections.
- Manual toggle operating mechanism.
- AC/DC circuit breaker design, subject to application-specific ratings.
- No integrated earth-fault protection.
- 205 × 186 × 103.5 mm product dimensions.
- Approximately 5.6 kg net weight.
- ABB product ID 1SDA100384R1.
Technical Specifications
- Manufacturer: ABB
- Series: SACE Tmax XT
- Frame family: XT5
- Model: XT5N 400 TMA 400-4000 4p F F InN=50%In
- ABB order code: 1SDA100384R1
- ABB product ID: 1SDA100384R1
- ABB product group: T-Max XT 250 Range
- Alternative catalogue number: XT5NEN40ABFF000XXX
- Product type: Moulded case circuit breaker (MCCB)
- Frame size: XT5 400
- Rated current (In): 400 A
- Rated uninterrupted current (Iu): 400 A
- Number of poles: 4
- Neutral rating: 50% of phase rated current
- Neutral designation: InN=50%In
- Equivalent neutral rating: 200 A
- Breaking-capacity classification: N (Normal)
- Trip unit type: TMA
- Protection technology: Thermomagnetic
- Thermal overload adjustment range: 160–400 A
- Instantaneous magnetic protection adjustment range: 2000–4000 A
- Magnetic protection designation: I3
- Rated operational voltage: Up to 690 V AC
- DC operational voltage: Up to 750 V DC, subject to ABB's application-specific ratings
- Rated insulation voltage (Ui): 1000 V
- Rated impulse withstand voltage (Uimp): 8 kV
- Rated ultimate breaking capacity (Icu) at 230 V AC: 70 kA
- Rated ultimate breaking capacity (Icu) at 415 V AC: 36 kA
- Rated ultimate breaking capacity (Icu) at 440 V AC: 36 kA
- Rated ultimate breaking capacity (Icu) at 500 V AC: 25 kA
- Rated ultimate breaking capacity (Icu) at 690 V AC: 20 kA
- Rated service breaking capacity (Ics) at 415 V AC: 36 kA
- Rated short-time withstand current (Icw): 5 kA
- Mounting configuration: Fixed
- Main terminal arrangement: Front terminals
- Operating mechanism: Manual toggle
- Application: AC/DC circuits within published manufacturer ratings
- Integrated earth-fault protection: No
- Integrated motor operator: No
- Optional motor operating accessories: Available subject to compatibility
- Product protection rating: IP20
- Product net height: 205 mm
- Product net width: 186 mm
- Product net depth: 103.5 mm
- Dimensions (H × W × D): 205 × 186 × 103.5 mm
- Net weight: Approximately 5.6 kg
- Power loss: 24.1 W
- Mechanical durability: 20,000 operating cycles
- Electrical durability: 7,000 operating cycles
- EAN / GTIN: 8056221004619
- Minimum order quantity: 1 piece
- Customs tariff number: 85362090
- Applicable circuit breaker standard: IEC 60947-2
Advanced Thermomagnetic Protection for 400A Electrical Distribution
The ABB XT5N 400 TMA 400-4000 combines manual switching with automatic overcurrent protection in a single moulded case assembly. Its thermomagnetic trip unit is designed to disconnect the protected circuit when sustained overload or sufficiently high short-circuit currents exceed the selected protection thresholds.
The thermal overload element responds to sustained overcurrent conditions that could otherwise cause excessive conductor temperatures or damage connected electrical equipment. With an adjustable setting range of 160–400 A, the thermal protection can be selected according to the circuit's design current, conductor capacity and operating conditions.
The instantaneous magnetic element responds rapidly to high fault currents. For this model, the magnetic trip threshold can be adjusted between 2000 and 4000 A. Selecting the correct setting is important for accommodating permissible starting currents and achieving appropriate coordination with other protective devices.
The XT5N breaking-capacity classification identifies the normal short-circuit performance version within the XT5 family. At 415 V AC, the circuit breaker has a rated ultimate breaking capacity of 36 kA and a rated service breaking capacity of 36 kA. Both ratings must be considered in the context of the prospective fault current and the installation's protection requirements.
Unlike a simple switch-disconnector, the 1SDA100384R1 incorporates automatic overload and short-circuit protection. However, it does not include integrated earth-fault protection. Where earth-leakage or residual-current protection is required, suitable additional protective equipment must be incorporated into the electrical system.
Understanding the 50% Rated Neutral Configuration
The ABB 1SDA100384R1 features a four-pole arrangement with the designation InN=50%In. This means the neutral protection rating is half the phase rated current. For this 400 A circuit breaker, the neutral rating is therefore 200 A.
A 50% rated neutral may be suitable for appropriately designed three-phase distribution systems where the neutral current is expected to remain below the permitted rating. The arrangement should not be selected solely on the assumption that a balanced three-phase supply will always have a low neutral current.
In installations containing substantial single-phase loading, non-linear equipment or harmonic-producing loads, neutral currents may be significant. Electrical designers must assess the expected neutral current, including harmonic contributions, before specifying a reduced-neutral circuit breaker.
Where the installation requires a neutral rating equivalent to the phase rating, ABB offers a corresponding 100% rated neutral version. For the same 400 A XT5N TMA configuration, the relevant alternative is ABB 1SDA100385R1.
The neutral switching and protection arrangement must comply with the applicable earthing system and electrical regulations. Protective earth conductors must remain continuously bonded and must never be interrupted by the circuit breaker.
Installation, Protection Coordination and Operational Considerations
The ABB XT5N 400 TMA is designed for fixed installation within suitable low-voltage electrical switchboards and distribution assemblies. Its front terminal arrangement supports defined power connections, while the moulded case construction provides mechanical protection for the internal switching and protection components.
Correct installation requires verification of the operational voltage, prospective short-circuit current, conductor sizes, terminal compatibility and ambient conditions. The circuit breaker must be installed in accordance with ABB's instructions, including specified mounting clearances, terminal tightening torques and accessory requirements.
The thermal setting of 160–400 A and magnetic setting of 2000–4000 A should be selected as part of the circuit protection design. These settings must provide adequate conductor protection while accommodating normal operating currents and coordinating with upstream and downstream protective devices.
The 36 kA breaking capacity at 415 V AC must be compared with the prospective short-circuit current at the installation point. Where the available fault current exceeds the circuit breaker's standalone rating, a suitable manufacturer-approved back-up protection arrangement or a circuit breaker with a higher breaking capacity must be selected.
The MCCB is manually operated using its toggle mechanism. Compatible ABB XT5 accessories may be specified for additional control, signalling or remote operation where required. Such accessories must be selected according to the exact circuit breaker configuration and ABB's compatibility information.
Periodic inspection and maintenance should follow ABB's recommendations. Repeated tripping, overheating, damaged terminals or abnormal operation must be investigated by qualified personnel before the circuit is returned to service.
Typical Applications
- 400 A industrial electrical distribution circuits.
- Commercial building main and sub-distribution boards.
- Three-phase and neutral power distribution systems.
- Industrial machinery supply protection.
- Manufacturing and production facilities.
- Low-voltage electrical switchboards.
- Industrial plant rooms and switchrooms.
- Heating, ventilation and air conditioning power supplies.
- Pumping stations and water treatment facilities.
- Industrial process control equipment supplies.
- Motor feeder installations with correctly coordinated protection.
- Commercial infrastructure and building services.
- OEM electrical control and distribution assemblies.
- Applications requiring adjustable thermal and magnetic protection.
- Three-phase systems where a 50% rated neutral is appropriate.
