Why Choose the ABB 1SDA073700R1 Undervoltage Release?
The ABB 1SDA073700R1 is a genuine 220–240 V AC/DC undervoltage release (YU) designed for compatible ABB SACE Emax 2 air circuit breakers and Tmax XT7/XT7M moulded case circuit breakers. It provides automatic tripping when the control voltage falls below a specified level, protecting electrical installations against unsafe operating conditions and preventing unintended circuit breaker closing following a power failure.
Manufactured to ABB's high engineering standards, the undervoltage release integrates seamlessly into compatible breakers and is widely used in industrial power distribution, process automation, building services and critical infrastructure where electrical safety and regulatory compliance are essential.
Operating from a 220–240 V AC/DC control supply, the accessory continuously monitors the control voltage. If the voltage drops below the operating threshold, it automatically trips the circuit breaker, helping protect personnel, equipment and connected systems from undervoltage conditions.
Key Advantages
- Genuine ABB undervoltage release (YU).
- Provides automatic breaker tripping during undervoltage conditions.
- 220–240 V AC/DC operating voltage.
- Compatible with ABB SACE Emax 2 and Tmax XT7/XT7M circuit breakers.
- Helps prevent automatic re-energisation after power restoration.
- Ideal for industrial power distribution and critical electrical installations.
Key Features
- ABB YU undervoltage release.
- 220–240 V AC/DC universal control voltage.
- Automatic trip during voltage loss.
- Prevents breaker closing when undervoltage exists.
- Designed for ABB SACE Emax 2 and Tmax XT7/XT7M ranges.
- Loose/configurable installation.
- Suitable for both AC and DC control circuits.
- Original ABB accessory for dependable long-term performance.
Dependable Protection Against Voltage Loss
Undervoltage releases are essential safety accessories for circuit breakers used in industrial and commercial power systems. They ensure that a breaker automatically opens whenever the control voltage falls below its operating threshold and prevents reclosing until a satisfactory voltage is restored. This helps safeguard equipment, improves operational safety and supports compliance with electrical installation standards.
The ABB 1SDA073700R1 has been specifically engineered for seamless integration with compatible ABB Emax 2 and Tmax XT circuit breakers, delivering dependable performance in demanding low-voltage power distribution systems.
Typical Applications
- Industrial power distribution systems.
- Motor control centres.
- Building management systems.
- Critical infrastructure and utilities.
- Process automation plants.
- Main low-voltage switchboards.
