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1SDA054889R1 ABB UVR-C T4-T5-T6 60 V AC/DC Cabled Undervoltage Release
ABB 1SDA054889R1 is a cabled 60 V AC/DC UVR-C undervoltage release designed for compatible SACE Tmax T4, T5 and T6 moulded case circuit breakers.
£240.38
Why Choose the ABB 1SDA054889R1 UVR-C Undervoltage Release?
The ABB 1SDA054889R1 is a cabled undervoltage release (UVR-C) designed for compatible ABB SACE Tmax T moulded case circuit breakers. As part of the ABB Tmax T4–T6 accessory range, it provides automatic circuit breaker opening when the auxiliary control voltage falls below the operating threshold or is lost.
Designed for Tmax T4, T5 and T6 circuit breakers, the UVR-C provides an important control and protection function in industrial electrical distribution systems. The undervoltage release also prevents the associated breaker from being closed while the release is insufficiently energised, helping ensure that equipment is not unintentionally re-energised following a control-supply failure.
The 1SDA054889R1 has a rated control voltage of 60 V AC/DC and is supplied in a cabled configuration. This genuine ABB accessory is suitable for switchboards, machinery and power distribution systems requiring dependable undervoltage tripping and controlled circuit breaker operation.
Key Advantages
- Dedicated undervoltage release for automatic circuit breaker opening.
- Compatible with ABB Tmax T4, T5 and T6 circuit breakers.
- 60 V AC/DC rated control voltage for AC or DC control circuits.
- Cabled UVR-C configuration for integration into circuit breaker control wiring.
- Trips the breaker following loss or sufficient reduction of the auxiliary supply voltage.
- Prevents breaker closing while the undervoltage release is insufficiently energised.
Key Features
- ABB SACE Tmax T accessory.
- UVR-C cabled undervoltage release.
- 60 V AC rated voltage.
- 60 V DC rated voltage.
- Designed for Tmax T4, T5 and T6 moulded case circuit breakers.
- Undervoltage operating function for auxiliary-supply monitoring.
- Breaker opening threshold approximately 0.35–0.70 × Un.
- Breaker closing permitted when the release supply exceeds approximately 0.85 × Un.
Reliable Undervoltage Protection for Circuit Breaker Systems
An undervoltage release monitors its auxiliary control supply and causes the associated circuit breaker to open if that voltage disappears or falls sufficiently below its rated value. This functionality is useful where machinery or electrical equipment must disconnect automatically following a control-power failure rather than remain energised or restart unexpectedly when power returns.
The ABB 1SDA054889R1 combines a 60 V AC/DC operating rating with a cabled design for Tmax T4, T5 and T6 circuit breakers. The breaker opens as the release voltage falls through its specified undervoltage operating range and cannot be closed while the UVR-C remains inadequately energised, providing dependable control within industrial distribution and automation systems.
Typical Applications
- Undervoltage protection for ABB Tmax T4, T5 and T6 circuit breakers.
- Industrial electrical distribution panels.
- Machine control and automation systems.
- Switchboards and power distribution assemblies.
- Control-supply failure protection systems.
- Industrial shutdown and electrical interlocking circuits.
Technical Specifications
| Series | SACE Tmax T |
|---|---|
| Model / order code | 1SDA054889R1 |
| Product designation | UVR-C T4-T5-T6 60 Vac/dc |
| Product type | Cabled undervoltage release |
| Compatible circuit breakers | Tmax T4, T5 and T6 |
| Rated AC voltage | 60 V AC |
| Rated DC voltage | 60 V DC |
| Current type | AC/DC |
| Connection version | Cabled |
| Undervoltage opening range | approximately 0.35–0.70 × Un |
| Closing enable threshold | above approximately 0.85 × Un |
| Standards | IEC |
| Weight | 0.12 kg |
| EAN | 8015644560171 |
| ABB product group | 310511-T-Max T4 - T8 |
Frequently Asked Questions
What is the ABB 1SDA054889R1 used for?
The ABB 1SDA054889R1 is a cabled undervoltage release used to open a compatible Tmax circuit breaker when its auxiliary control voltage is lost or falls below the required operating level.
Which ABB circuit breakers are compatible with the 1SDA054889R1?
The release is designed for use with ABB Tmax T4, T5 and T6 moulded case circuit breakers.
What voltage does the ABB 1SDA054889R1 use?
The 1SDA054889R1 has a rated control voltage of 60 V AC/DC.
What happens if the control voltage falls too low?
The undervoltage release causes the associated circuit breaker to open when the auxiliary voltage falls into its operating range, approximately 0.35–0.70 × Un, or when the control supply is lost.
Can the circuit breaker close when the UVR-C is not energised?
No. The undervoltage release prevents the breaker from closing while it is inadequately energised; closing is enabled when the auxiliary voltage applied to the release is above approximately 0.85 × Un.
Trusted by Electrical Professionals Worldwide
ABB SACE Tmax circuit breaker accessories provide coordinated control and protection functions for industrial and commercial electrical distribution systems, helping panel builders, engineers and system integrators implement dependable undervoltage protection and circuit breaker operation.
