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1SDA054283R1 ABB T4L 250 TMA 125-1250 125 A 4-Pole MCCB
ABB 1SDA054283R1 T4L 250 TMA 125-1250 is a 125 A four-pole fixed moulded case circuit breaker with front terminals, a fully rated neutral, adjustable thermomagnetic protection and a 120 kA ultimate short-circuit breaking capacity at 400 V AC.
£1,771.19
Why Choose the ABB T4L 250 TMA 125-1250 Circuit Breaker?
The ABB T4L 250 TMA 125-1250, order code 1SDA054283R1, is a high-performance 4-pole moulded case circuit breaker (MCCB) designed for protection and switching in low-voltage electrical distribution systems. As part of the proven ABB SACE Tmax T4 series, it combines a 125 A rated current with a TMA thermomagnetic trip unit and a fully rated neutral for dependable protection of industrial and commercial power circuits.
The TMA thermomagnetic trip unit provides thermal overload and adjustable magnetic short-circuit protection without requiring an external power supply. This configuration provides a magnetic short-circuit release adjustment range of 625–1250 A, allowing effective protection against high fault currents while providing reliable overload protection for the connected circuit.
With a rated current of 125 A, a rated operational voltage of up to 690 V AC and an ultimate short-circuit breaking capacity of 120 kA at 400 V AC, the T4L 250 is suitable for demanding low-voltage distribution applications. Its 4-pole fixed construction with front terminals and 100% rated neutral makes it particularly suitable for three-phase four-wire distribution systems.
Key Advantages
- Proven ABB SACE Tmax T4 moulded case circuit breaker platform.
- 125 A rated current for industrial and commercial distribution circuits.
- 120 kA ultimate breaking capacity at 400 V AC for high-fault-level installations.
- TMA thermomagnetic release provides overload and short-circuit protection.
- 625–1250 A adjustable magnetic trip range.
- 4-pole configuration with fully rated neutral for three-phase four-wire systems.
- Fixed mounting and front terminals simplify integration into low-voltage switchboards.
Key Features
- ABB SACE Tmax T4L 250 circuit breaker.
- 125 A rated current.
- 250 A rated uninterrupted frame current.
- 4-pole configuration.
- Neutral rated at 100% of phase current.
- Fixed mounting execution.
- Front terminals.
- TMA thermomagnetic trip unit.
- 625–1250 A magnetic short-circuit adjustment range.
- 120 kA Icu at 400 V AC.
Reliable Thermomagnetic Protection with a Fully Rated Neutral
Moulded case circuit breakers such as the ABB Tmax T4 protect electrical installations by automatically interrupting excessive currents caused by overloads and short circuits. The T4L performance level combines compact construction with high short-circuit interruption capability, making it suitable for demanding industrial and commercial distribution systems.
The TMA release provides self-powered thermomagnetic circuit protection, while the fully rated fourth pole allows the neutral conductor to carry up to the same rated current as the phase conductors. This configuration is particularly useful in three-phase four-wire systems where neutral loading can be significant.
Typical Applications
- Industrial low-voltage distribution boards.
- Three-phase four-wire electrical systems.
- Main and feeder circuit protection.
- Manufacturing and process plant electrical systems.
- Commercial and infrastructure switchboards.
- Machinery and automation power distribution.
- Circuits requiring a fully rated neutral conductor.
Technical Specifications
| Series | SACE Tmax T4 |
|---|---|
| ABB order code | 1SDA054283R1 |
| EAN | 8015644553807 |
| Product type | Moulded case circuit breaker (MCCB) |
| Frame | T4 |
| Performance level | L |
| Rated uninterrupted current (Iu) | 250 A |
| Rated current (In) | 125 A |
| Trip unit | TMA thermomagnetic |
| Magnetic short-circuit adjustment range | 625–1250 A |
| Number of poles | 4 |
| Neutral rating | 100% of phase current |
| Rated operational voltage | 690 V AC / 750 V DC |
| Rated insulation voltage (Ui) | 1000 V |
| Rated impulse withstand voltage (Uimp) | 8 kV |
| Ultimate short-circuit breaking capacity (Icu) at 220–230 V AC | 200 kA |
| Ultimate short-circuit breaking capacity (Icu) at 380–415 V AC | 120 kA |
| Ultimate short-circuit breaking capacity (Icu) at 440 V AC | 100 kA |
| Ultimate short-circuit breaking capacity (Icu) at 500 V AC | 85 kA |
| Ultimate short-circuit breaking capacity (Icu) at 690 V AC | 70 kA |
| Mounting | Fixed |
| Terminal arrangement | Front terminals |
| Dimensions (H × W × D) | 205 × 140 × 103.5 mm |
| Net weight | approx. 3.05 kg |
| Mechanical durability | 20,000 operations |
| Electrical durability | 8,000 operations |
Frequently Asked Questions
What is the ABB 1SDA054283R1?
The ABB 1SDA054283R1 is a Tmax T4L 250 fixed 4-pole moulded case circuit breaker with front terminals, a 125 A TMA thermomagnetic release and a fully rated neutral.
What is the rated current of this circuit breaker?
This T4L 250 configuration has a rated current of 125 A and a rated uninterrupted frame current of 250 A.
What is the magnetic trip range?
The TMA trip unit provides an adjustable magnetic short-circuit release range of 625–1250 A.
What does InN=100%In mean?
It means the neutral pole is fully rated at 100% of the phase rated current, making the breaker suitable for applications where the neutral conductor may carry substantial current.
What is the breaking capacity of the ABB T4L 250?
The breaker has an ultimate short-circuit breaking capacity of 120 kA at 380–415 V AC, with breaking capacity varying according to operating voltage.
Trusted ABB Circuit Protection
ABB SACE Tmax moulded case circuit breakers are widely used in industrial and commercial electrical distribution systems, providing dependable switching, thermomagnetic protection and high short-circuit performance for demanding low-voltage installations.
