Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
1SDA054674R1 ABB TMA250-2500T44pInN=100%In 250 A 4-Pole Thermomagnetic Trip Unit
ABB TMA250-2500T44pInN=100%In 1SDA054674R1 is a 250 A four-pole thermomagnetic trip unit with an adjustable 1250–2500 A instantaneous magnetic trip setting and fully rated neutral for compatible ABB SACE Tmax T4 moulded-case circuit breakers.
£2,952.87
Why Choose the ABB TMA250-2500T44pInN=100%In Thermomagnetic Trip Unit?
The ABB TMA250-2500T44pInN=100%In, order code 1SDA054674R1, is a four-pole thermomagnetic trip unit designed for ABB SACE Tmax T4 moulded-case circuit breakers. As part of the ABB Tmax T4 protection system, it provides reliable thermal overload and magnetic short-circuit protection for low-voltage AC and DC electrical distribution applications.
The TMA release combines adjustable thermal overload protection with adjustable instantaneous magnetic protection in a robust electromechanical design. This enables protection settings to be matched to the requirements of the installation while providing dependable circuit protection without requiring an external auxiliary power supply.
With a rated current of 250 A and an adjustable instantaneous magnetic trip setting of 1250–2500 A, the TMA250-2500T44p is designed for four-pole ABB Tmax T4 circuit breakers. This version incorporates a fully rated neutral at 100% of the phase rated current, making it particularly suitable for four-wire distribution systems requiring full neutral protection.
Key Advantages
- Genuine ABB thermomagnetic trip unit designed for Tmax T4 circuit breakers.
- 250 A rated current for industrial and commercial power distribution.
- Adjustable 1250–2500 A instantaneous magnetic trip setting.
- Four-pole configuration for suitable three-phase, four-wire systems.
- Fully rated neutral at 100% In for complete neutral conductor protection.
- Combines adjustable thermal overload and magnetic short-circuit protection.
- Suitable for AC and DC circuit protection with compatible ABB Tmax T4 circuit breakers.
Key Features
- ABB SACE Tmax T4 series protection component.
- TMA adjustable thermomagnetic release technology.
- 250 A rated current.
- 1250–2500 A adjustable instantaneous magnetic trip setting.
- Four-pole design.
- Fully rated neutral, InN = 100% In.
- Thermal protection against sustained overload conditions.
- Magnetic protection for rapid response to short-circuit currents.
- Designed specifically for integration with compatible ABB SACE Tmax T4 moulded-case circuit breakers.
Reliable Thermomagnetic Circuit Protection
Thermomagnetic releases such as the ABB TMA250-2500T44p protect electrical circuits using complementary thermal and magnetic operating principles. The thermal element responds to sustained overload currents to help prevent excessive heating of conductors and connected equipment, while the magnetic element provides rapid operation when high short-circuit currents occur.
The adjustable TMA design allows protection to be coordinated with the characteristics of the electrical installation. Combined with its four-pole configuration and fully rated neutral, the TMA250-2500T44p provides dependable protection for industrial and commercial four-wire distribution systems using compatible ABB Tmax T4 moulded-case circuit breakers.
Typical Applications
- Industrial low-voltage distribution switchboards.
- Commercial electrical distribution systems.
- Three-phase, four-wire power distribution systems.
- Electrical control and distribution panels.
- Industrial machinery and equipment protection.
- Feeder and branch circuit protection.
- AC and DC electrical distribution installations.
Technical Specifications
| Series | SACE Tmax T4 |
|---|---|
| Order code | 1SDA054674R1 |
| Product group | 310511-T-Max T4 - T8 |
| Product type | Thermomagnetic trip unit / release |
| Trip unit type | TMA |
| Rated current | 250 A |
| Instantaneous magnetic trip setting (I3) | 1250–2500 A |
| Number of poles | 4 |
| Neutral rating | 100% In (fully rated neutral) |
| Protection functions | Thermal overload and adjustable magnetic short-circuit protection |
| Application | AC / DC circuit protection |
| Compatible circuit breaker family | ABB SACE Tmax T4 |
Frequently Asked Questions
What is the ABB TMA250-2500T44pInN=100%In used for?
The ABB TMA250-2500T44pInN=100%In provides thermal overload and adjustable magnetic short-circuit protection when installed with a compatible ABB SACE Tmax T4 moulded-case circuit breaker.
What is the rated current of the TMA250-2500T44p?
The trip unit has a rated current of 250 A.
What is the magnetic trip range?
The TMA250-2500T44p has an adjustable instantaneous magnetic trip setting of 1250–2500 A.
What does InN=100%In mean?
InN=100%In means the neutral pole is fully rated at 100% of the phase rated current, providing full neutral protection in suitable four-wire electrical distribution systems.
Which circuit breaker series is the ABB 1SDA054674R1 designed for?
The trip unit is designed for use with compatible ABB SACE Tmax T4 moulded-case circuit breakers.
Trusted ABB Circuit Protection
ABB SACE Tmax circuit protection equipment is designed for dependable low-voltage electrical distribution, combining robust construction with coordinated overload and short-circuit protection for industrial and commercial installations.
