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1SDA054651R1 ABB TMD 20-320 T4 3P Thermomagnetic Trip Unit
ABB 1SDA054651R1 is a 20 A three-pole TMD thermomagnetic trip unit for SACE Tmax T4 circuit breakers with thermal overload protection and a 320 A instantaneous magnetic trip threshold.
£667.40
Why Choose the ABB 1SDA054651R1 TMD 20-320 T4 3P Thermomagnetic Trip Unit?
The ABB 1SDA054651R1 is a TMD thermomagnetic trip unit designed for three-pole ABB SACE Tmax T4 moulded-case circuit breakers. With a rated current of 20 A and an instantaneous magnetic trip threshold of 320 A, it provides dependable overload and short-circuit protection for low-voltage electrical distribution systems.
As part of the ABB SACE Tmax T4 protection range, the TMD 20-320 combines thermal overload protection with magnetic short-circuit protection in a compact trip unit. The thermal element responds to sustained overcurrent conditions, while the magnetic element provides rapid operation when high fault currents occur.
Designed for three-pole AC and DC applications with compatible Tmax T4 circuit breakers, the TMD 20-320 provides a straightforward electromechanical protection solution without requiring an external auxiliary power supply for its fundamental protective functions.
Key Advantages
- Purpose-designed thermomagnetic trip unit for ABB SACE Tmax T4 circuit breakers.
- 20 A rated current for protection of compatible low-current circuits.
- 320 A instantaneous magnetic trip threshold for short-circuit protection.
- Combines thermal overload and magnetic short-circuit protection.
- Three-pole configuration for three-phase electrical distribution applications.
- Suitable for compatible AC and DC Tmax T4 applications.
Key Features
- ABB TMD 20-320 thermomagnetic trip unit.
- Designed for ABB SACE Tmax T4 moulded-case circuit breakers.
- 20 A rated current (In).
- 320 A magnetic trip threshold (I3).
- Three-pole (3P) configuration.
- Thermal protection against sustained overload conditions.
- Magnetic protection against short-circuit fault currents.
- Electromechanical protection principle requiring no electronic trip-unit programming.
Reliable Thermomagnetic Circuit Protection
Thermomagnetic trip units provide two complementary forms of circuit protection. The thermal element responds to sustained overload currents that can cause excessive conductor and equipment heating, while the magnetic element reacts rapidly to high short-circuit currents to initiate opening of the associated circuit breaker.
The ABB TMD 20-320 is engineered for the Tmax T4 platform and provides these protection functions without the complexity of an electronic protection relay. This makes it well suited to electrical distribution installations requiring robust, straightforward overload and short-circuit protection.
Typical Applications
- ABB SACE Tmax T4 moulded-case circuit breaker installations.
- Industrial low-voltage distribution boards.
- Commercial electrical distribution systems.
- Three-phase feeder and branch-circuit protection.
- Machinery and industrial control panels.
- AC and DC electrical circuit protection applications.
Technical Specifications
| Series | SACE Tmax T4 |
|---|---|
| ABB order code | 1SDA054651R1 |
| Product type | Thermomagnetic trip unit |
| Trip unit type | TMD |
| Suitable for | ABB SACE Tmax T4 moulded-case circuit breaker |
| Rated current (In) | 20 A |
| Instantaneous magnetic trip current (I3) | 320 A |
| Number of poles | 3 |
| Protection principle | Thermal and magnetic |
| Overload protection | Thermal |
| Short-circuit protection | Magnetic instantaneous |
| Application | AC / DC circuit protection |
| EAN | 8015644557560 |
Frequently Asked Questions
What is the ABB 1SDA054651R1?
The ABB 1SDA054651R1 is a TMD 20-320 three-pole thermomagnetic trip unit designed for compatible ABB SACE Tmax T4 moulded-case circuit breakers.
What is the rated current of the ABB TMD 20-320?
The trip unit has a rated current (In) of 20 A.
What is the magnetic trip threshold of this TMD trip unit?
The ABB 1SDA054651R1 has an instantaneous magnetic trip threshold (I3) of 320 A.
What protection does the TMD 20-320 provide?
It combines thermal overload protection with instantaneous magnetic short-circuit protection for compatible Tmax T4 circuit breaker installations.
How many poles does the ABB 1SDA054651R1 have?
The 1SDA054651R1 is a three-pole (3P) trip unit intended for compatible three-pole ABB SACE Tmax T4 circuit breakers.
Which ABB circuit breaker family is this trip unit designed for?
The TMD 20-320 trip unit is designed for the ABB SACE Tmax T4 moulded-case circuit breaker platform.
Trusted by Electrical Professionals Worldwide
ABB SACE Tmax circuit protection products are widely used in industrial and commercial electrical distribution systems where dependable overload and short-circuit protection is required.
