ABB YU undervoltage release accessory for Tmax XT5 and XT6 moulded case circuit breakers, suitable for 220-240 VAC and 220-250 VDC control voltages.
£150.05
The ABB 1SDA104944R1 is a genuine YU undervoltage release (UVR) accessory designed for ABB Tmax XT5 and XT6 moulded case circuit breakers (MCCBs). It automatically trips the circuit breaker whenever the supply voltage falls below the operating threshold, helping to prevent unsafe equipment operation following a voltage loss or significant voltage drop.
Designed for industrial and commercial power distribution systems, the YU XT5-XT6 220–240 V AC / 220–250 V DC undervoltage release provides dependable remote tripping and complies with internationally recognised standards including IEC 60947-2 and UL 489. Its compact, factory-engineered design ensures seamless integration with compatible ABB Tmax XT circuit breakers.
Ideal for machinery safety, emergency stop systems, building services and industrial process control, the ABB 1SDA104944R1 enhances electrical safety by ensuring that a circuit breaker cannot remain closed during an undervoltage condition or automatically reclose after power restoration without operator intervention.
An undervoltage release continuously monitors the control supply voltage. If the voltage falls below the specified operating level or is completely lost, the accessory immediately trips the associated circuit breaker. This prevents equipment from operating under unsafe voltage conditions and helps eliminate unexpected automatic restarts once power returns.
This function is widely specified for machinery safety systems, industrial automation, emergency shutdown circuits, fire protection systems and critical building services where safe disconnection during power loss is essential.
| Voltage | 240 V |
|---|---|
| Manufacturer | ABB |
| Product ID | 1SDA104944R1 |
| Model | YU XT5-XT6 |
| Product type | Undervoltage Release (UVR) |
| Accessory series | ABB Tmax XT |
| Suitable for | XT5 and XT6 moulded case circuit breakers |
| Rated control voltage (AC 50/60 Hz) | 220–240 V |
| Rated control voltage (DC) | 220–250 V |
| Voltage type | AC/DC |
| Electrical connection | Non-wired version |
| Standards | IEC 60947-2, UL 489 |
| Weight | Approximately 0.107 kg |
| EAN | 8015644070366 |
| RoHS compliant | Yes |
| HS Code | 85389099 |
| Country of Manufacture | Italy |
It is an ABB YU undervoltage release accessory for Tmax XT5 and XT6 moulded case circuit breakers that automatically trips the breaker if the control voltage is lost.
It is designed specifically for ABB Tmax XT5 and XT6 moulded case circuit breakers.
The accessory operates from 220–240 V AC (50/60 Hz) or 220–250 V DC.
It disconnects the circuit breaker whenever the control voltage falls below a safe operating level, preventing unsafe equipment operation and unintended automatic restarting after power restoration.
Yes. The 1SDA104944R1 is a genuine ABB Tmax XT accessory manufactured for direct compatibility with XT5 and XT6 circuit breakers.
ABB Tmax XT accessories are trusted worldwide to enhance the safety, reliability and functionality of moulded case circuit breakers used in industrial, commercial and infrastructure power distribution systems.
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...