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1SDA054732R1 ABB TMA400-4000 T5 400 A 4-Pole Thermomagnetic Trip Unit
ABB 1SDA054732R1 TMA400-4000 400 A four-pole thermomagnetic trip unit with a fully rated neutral and adjustable short-circuit protection for compatible ABB Tmax T5 circuit breakers.
£1,093.42
Why Choose the ABB 1SDA054732R1 TMA400-4000 T5 Trip Unit?
The ABB 1SDA054732R1 is a four-pole TMA thermomagnetic trip unit designed for use with ABB Tmax T5 moulded-case circuit breakers. Part of the ABB Tmax T4–T8 circuit-breaker range, this protection release provides dependable overload and short-circuit protection for industrial low-voltage electrical distribution systems.
The TMA release combines thermal overload protection with adjustable magnetic instantaneous short-circuit protection. This proven thermomagnetic operating principle provides reliable circuit protection without requiring an external control power supply, making the unit well suited to industrial switchboards, distribution panels and other demanding electrical installations.
With a rated current of 400 A, a four-pole configuration and a fully rated neutral at 100% of phase current, the 1SDA054732R1 is suitable for three-phase four-wire systems where the neutral conductor requires full-current protection. Its instantaneous magnetic release is adjustable from 2000–4000 A.
Key Advantages
- Reliable thermomagnetic protection for ABB Tmax T5 circuit breakers.
- 400 A rated current for industrial power distribution applications.
- Four-pole configuration suitable for three-phase four-wire systems.
- Fully rated neutral at 100% of phase current.
- Adjustable instantaneous short-circuit protection from 2000–4000 A.
- Combines thermal overload and magnetic short-circuit protection in a robust mechanical-electrical design.
Key Features
- ABB TMA400-4000 thermomagnetic trip unit.
- Designed for ABB Tmax T5 moulded-case circuit breakers.
- 400 A rated current.
- Four-pole (4P) configuration.
- 100% rated neutral protection.
- Thermal protection against sustained overload conditions.
- Adjustable magnetic instantaneous protection from 2000–4000 A.
- Suitable for industrial low-voltage power distribution applications.
Reliable Thermomagnetic Circuit Protection
Thermomagnetic trip units combine two complementary protection principles. The thermal element responds to sustained overcurrents to provide overload protection, while the magnetic element responds rapidly to high fault currents to provide instantaneous short-circuit protection. This makes TMA releases a robust solution for protecting low-voltage distribution circuits.
The ABB TMA400-4000 release provides an adjustable instantaneous protection range of 2000–4000 A. Its four-pole construction and fully rated neutral make it particularly suitable for three-phase four-wire installations where neutral current must be considered as part of the overall circuit protection strategy.
Typical Applications
- Industrial low-voltage power distribution systems.
- ABB Tmax T5 moulded-case circuit breakers.
- Three-phase four-wire electrical systems.
- Electrical switchboards and distribution panels.
- Industrial machinery and manufacturing installations.
- Feeder circuits requiring overload and short-circuit protection.
Technical Specifications
| Product group | 310511-T-Max T4 - T8 |
|---|---|
| Order code / MPN | 1SDA054732R1 |
| Product type | Thermomagnetic trip unit / protection release |
| Circuit-breaker series | ABB Tmax |
| Compatible circuit breaker | Tmax T5 |
| Trip unit | TMA |
| Protection type | Thermal overload and magnetic short-circuit protection |
| Rated current | 400 A |
| Number of poles | 4 |
| Neutral rating | 100% In |
| Instantaneous short-circuit setting range | 2000–4000 A |
| Suitable for overload protection | Yes |
| Suitable for power circuit breakers | Yes |
Frequently Asked Questions
What is the ABB 1SDA054732R1 used for?
The ABB 1SDA054732R1 is a TMA thermomagnetic trip unit designed for compatible ABB Tmax T5 circuit breakers, providing thermal overload and magnetic short-circuit protection for low-voltage electrical distribution systems.
What is the rated current of the ABB 1SDA054732R1?
The TMA400-4000 trip unit has a rated current of 400 A.
What is the instantaneous short-circuit setting range?
The magnetic instantaneous short-circuit release is adjustable from 2000–4000 A.
What does InN=100%In mean?
InN=100%In indicates that the neutral is fully rated at 100% of the phase rated current, making this four-pole release suitable for applications where full neutral-current capability is required.
Which circuit breaker is the ABB 1SDA054732R1 designed for?
The 1SDA054732R1 is a four-pole TMA thermomagnetic trip unit designed for compatible ABB Tmax T5 moulded-case circuit breakers.
Trusted ABB Circuit Protection
ABB Tmax circuit-breaker protection systems provide dependable low-voltage electrical protection, combining robust moulded-case circuit-breaker technology with thermomagnetic releases for industrial switchboards, distribution systems and machinery installations.
