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1SDA104950R1 ABB YU-C XT5 W 110…127 V AC – 110…125 V DC Undervoltage Release
ABB 1SDA104950R1 YU-C XT5 W is a wired 110…127 V AC / 110…125 V DC undervoltage release designed for compatible withdrawable ABB SACE Tmax XT5 circuit breakers.
£128.03
Why Choose the ABB 1SDA104950R1 YU-C XT5 W 110...127 V AC - 110...125 V DC?
The ABB 1SDA104950R1 is a genuine wired undervoltage release designed for compatible ABB SACE Tmax XT5 moulded-case circuit breakers. Supplied as the YU-C XT5 W 110...127 V AC - 110...125 V DC, it is specifically intended for withdrawable XT5 circuit breakers and provides automatic opening when its control supply falls below the required operating level.
The YU-C undervoltage release is continuously associated with the circuit breaker's operating mechanism. If the auxiliary supply is lost or falls sufficiently below its rated value, the release causes the breaker to open. It also prevents the circuit breaker from being closed while the undervoltage release is inadequately energised, providing an important control function for installations where breaker operation depends on the presence of a healthy auxiliary supply.
Designed for 110...127 V AC or 110...125 V DC control circuits, the 1SDA104950R1 provides AC/DC flexibility for compatible ABB SACE Tmax XT5 withdrawable installations. Its wired construction makes it suitable for industrial switchboards, automation systems and power distribution applications requiring undervoltage-dependent circuit breaker operation.
Key Advantages
- Genuine ABB SACE Tmax XT5 undervoltage release.
- Designed specifically for withdrawable XT5 circuit breakers.
- Supports 110...127 V AC and 110...125 V DC control supplies.
- Automatically opens the breaker following sufficient loss or reduction of control voltage.
- Prevents breaker closing when the undervoltage release is not adequately energised.
- Wired YU-C configuration for straightforward integration into compatible XT5 assemblies.
Key Features
- ABB SACE Tmax XT accessory range.
- YU-C wired undervoltage release.
- Designed for XT5 frame size.
- Suitable for withdrawable (W) circuit breaker configurations.
- 110...127 V AC rated control voltage.
- 110...125 V DC rated control voltage.
- Supports both 50 Hz and 60 Hz AC control systems.
- Provides undervoltage-dependent opening and closing interlock functionality.
How an ABB Undervoltage Release Protects Circuit Operation
An undervoltage release monitors the presence of its auxiliary control supply and interacts directly with the circuit breaker operating mechanism. If the voltage falls sufficiently below the required level or disappears entirely, the release causes the circuit breaker to open. This can help prevent equipment from remaining energised or automatically restarting when the associated control supply is lost.
The ABB 1SDA104950R1 performs this function on compatible withdrawable Tmax XT5 circuit breakers. When the YU-C release is not sufficiently energised, circuit breaker closing is inhibited; once the auxiliary voltage has recovered to the required level, the mechanism can again permit closing. This behaviour makes undervoltage releases particularly useful in industrial control and safety-related power distribution schemes.
Typical Applications
- ABB SACE Tmax XT5 withdrawable circuit breaker installations.
- Switchboards requiring undervoltage-dependent breaker opening.
- Industrial power distribution and control systems.
- Automated installations requiring breaker closing inhibition after control-voltage loss.
- Machinery and process control systems using AC or DC auxiliary supplies.
- OEM switchgear requiring a wired undervoltage release for withdrawable XT5 breakers.
Technical Specifications
| Series | SACE Tmax XT |
|---|---|
| Product group | T-Max XT 250 Range |
| Order code | 1SDA104950R1 |
| Alternate catalogue number | KXT5YUCW4 |
| Product type | Circuit breaker electrical accessory |
| Accessory type | Undervoltage Release (UVR) |
| Product main type | Accessories - Electrical and Aux Contacts |
| Release version | YU-C wired |
| Frame size | XT5 |
| Circuit breaker version | Withdrawable |
| Rated AC control voltage | 110...127 V AC |
| Rated DC control voltage | 110...125 V DC |
| AC frequency | 50 / 60 Hz |
| Control voltage type | AC/DC |
| Function | Undervoltage release and closing inhibition |
| Reference standards | IEC 60947-2 / UL 489 |
| RoHS compliance | EU Directive 2011/65/EU and amendment 2015/863 |
| Product net weight | 0.115 kg |
| GTIN / EAN | 8015644070427 |
Frequently Asked Questions
What is the ABB 1SDA104950R1 used for?
The ABB 1SDA104950R1 is a wired undervoltage release for compatible ABB SACE Tmax XT5 withdrawable circuit breakers. It causes the breaker to open when its auxiliary control voltage falls sufficiently and inhibits closing when adequate control voltage is unavailable.
What voltage does the ABB 1SDA104950R1 support?
The YU-C release is rated for 110...127 V AC and 110...125 V DC, allowing it to operate with suitable AC or DC auxiliary control supplies.
Which ABB circuit breaker configuration is compatible with the 1SDA104950R1?
The 1SDA104950R1 is designed specifically for compatible ABB SACE Tmax XT5 withdrawable circuit breakers.
What does YU-C mean on the ABB 1SDA104950R1?
YU identifies an undervoltage release, while YU-C identifies the wired version. The accessory monitors its auxiliary supply and interacts with the circuit breaker mechanism to provide undervoltage opening and closing inhibition.
What is the EAN for the ABB 1SDA104950R1?
The GTIN / EAN is 8015644070427 for the ABB 1SDA104950R1 YU-C XT5 W 110...127 V AC - 110...125 V DC undervoltage release.
Trusted ABB Circuit Breaker Accessories
ABB SACE Tmax XT electrical accessories are engineered to complement the company's moulded-case circuit breaker platform, providing integrated control, release and operating functions for industrial low-voltage power distribution systems.
