1SDA054445R1 ABB T5H 400 TMA 400-4000 3p F F Molded Case Circuit Breakers

1SDA054445R1 ABB T5H 400 TMA 400-4000 3p F F Molded Case Circuit Breakers

1.Overview of the 1SDA054445R1 ABB T5H 400 TMA 400-4000 3p F F

The 1SDA054445R1 is a fixed, three-pole molded case circuit breaker (MCCB) in the ABB Tmax T5H frame, rated at 400 A. Equipped with the TMA adjustable thermal-magnetic trip unit, it offers a short-circuit breaking capacity of up to 70 kA (400 VAC). It is suitable for protecting distribution systems, transformer secondary sides, large-capacity motor feeders, and generator outputs. Its compact 140 mm width and front-connection design allow installation within a 600 mm depth, significantly saving switchgear space.

Core Functions and Features
Reliable Protection: The built-in thermal-magnetic trip unit (TMA) provides dual protection. Thermal protection provides inverse-time overload protection, while magnetic protection instantly interrupts high-amplitude short-circuit currents, effectively protecting lines and equipment.

Excellent Breaking Capacity: This circuit breaker boasts a rated ultimate short-circuit breaking capacity (Icu) of up to 70kA, meaning it can reliably interrupt and withstand high short-circuit currents, ensuring rapid isolation of the power system in the event of a fault, safeguarding personnel and equipment.

Flexible Current Adjustment: The magnetic trip value can be adjusted over a wide range from 400A to 4000A, allowing engineers to precisely set protection parameters based on specific line protection and equipment startup requirements, achieving customized protection.

Stable Installation and Connection: The fixed mounting design provides a stable structure suitable for long-term use. Front-panel wiring allows all wiring operations to be completed at the front of the circuit breaker, making installation and maintenance more convenient and significantly saving time and labor costs.

2.Core Features:

Order Number: 1SDA054445R1
Series: Tmax T5H
Number of Poles: 3P
Mounting Type: Fixed
Wiring Method: Front Terminals
Frame Current: 400 A
Rated Current: In: 400 A (Adjustable from 0.7 to 1 × In, i.e., 280 to 400 A)
Rated Operating Voltage: Ue: 690 V AC / 750 V DC
Rated Insulation Voltage: Ui: 1000 V
Rated Impulse Withstand Voltage: Uimp: 8 kV
Breaking Capacity: Icu: 70 kA @ 400 V AC; 65 kA @ 440 V AC; 40 kA @ 690 V AC; 100 kA @ 230 V AC
Short-Time Withstand Current: Icw: 5 kA / 1 s
Trip Unit Type: TMA (Thermo-Magnetic Adjustable)
Thermal Trip Range: 0.7 to 1 × In = 280-400 A (stepless knob)
Magnetic tripping range: 5-10 × In = 2000-4000 A (stepless knob)
Mechanical life: 20,000 cycles
Electrical life: 7,000 cycles @ 400 V AC
Operating frequency: 120 cycles/h (mechanical); 60 cycles/h (electrical)
Operating temperature: -25°C ... +70°C
Protection degree: IP20 (terminals: IP30)
Dimensions: W × H × D: 140 × 205 × 103.5 mm
Net weight: 4.8 kg
Certifications: IEC 60947-2, CE, RoHS, CCC

Feature Highlights
H-class high-interrupting capability: 70 kA @ 400 V, meeting high fault current requirements on the transformer secondary side.
Fully adjustable TMA: 280-400 A in the hot section and 2-4 kA in the magnetic section, enabling precise matching with cables and equipment.
Dual-voltage platform: The same product covers 690 V AC / 750 V DC, suitable for both AC and DC power distribution.
Compact fixed design: 140 mm wide and 600 mm deep, allowing installation, saving 30% space.
Isolation: Complies with IEC 60947-2 isolation requirements and can also function as a main switch, eliminating the need for an additional disconnector.
Maintenance-free design: Silver graphite contacts and self-lubricating bearings offer a mechanical life of 20,000 cycles and a maintenance interval of ≥5 years.

Typical Applications
Transformer secondary side feeder or tie switch
Large-capacity motor feeder (≤250 kW direct-on-line starter)
Generator outlet and utility power switchgear
Data center UPS input/output protection
Main power distribution switch in industrial and mining power distribution rooms

3.Product details pictures

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