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The 1SDA073700R1 is an undervoltage release (YU) for low-voltage frame circuit breakers and molded case circuit breakers. It operates at 220V-240V AC/DC and automatically trips the circuit breaker when the supply voltage drops to between 35% and 70% of its rated value, providing reliable safety protection for industrial and commercial power systems.
Universal AC/DC Interoperability
Continuous Fail-Safe Voltage Monitoring
Equipment Protection & Anti-Restart Security
This original plug-and-play safety component delivers perfect mechanical and electrical integration within ABB SACE Emax 2 (E1.2 to E6.2) air circuit breakers and SACE Tmax XT7/XT7M molded case circuit breakers. Manufactured in Italy to comply with stringent IEC global electrical standards, its wide-voltage architecture seamlessly accommodates both alternating and direct current networks, allowing global distributors and panel builders to minimize stock variants. Beyond emergency tripping during brownouts, it acts as a critical electrical interlock by keeping the breaker locked open during extended blackouts, eliminating the risk of hazardous, uncontrolled machinery self-restarting when grid power returns.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
ABB 1SDA073700R1 Undervoltage Release (YU) Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Oil & Gas
Integrated into Emergency Shutdown (ESD) security systems, this module operates as a fail-safe device: if the control cable cuts or power fails completely, the coil immediately releases to trip the breaker, isolating the zone from spark risks.
Automotive Manufacturing
Protects technicians by ensuring that heavy robotic equipment or high-pressure press machines remain electrically locked out during a blackout, eliminating dangerous automatic restarts when utility power is restored.
Semiconductor
Wafers are highly sensitive to voltage sags (brownouts); the 1SDA073700R1 instantly trips the main power breaker if grid voltage drops below 70%, preventing corrupted production runs and damage to multimillion-dollar tooling equipment.
Chemical Processing Plants
Prevents hazardous situations by locking out chemical feed pump motors during a power outage. It ensures that when power returns, the motors cannot self-restart without operator re-authorization, avoiding explosive chemical imbalances.
Steel Mills & Metallurgy
High-power induction loads cause severe localized voltage dips, the 1SDA073700R1 acts as an infrastructure safeguard, tripping the main air circuit breaker to protect massive heavy-duty equipment if the grid voltage degrades to critical degradation levels.
Before installing or maintaining the 1SDA073700R1 undervoltage release, always ensure that the circuit breaker is completely de-energized and the charging springs are fully discharged. The input control voltage must be strictly maintained within the 220–240V AC/DC range. Because this module operates under a continuous-duty cycle, the circuit breaker cannot be closed if the coil is not energized or if the control voltage drops below the safety threshold. During operation, ensure proper switchboard ventilation to maintain an ambient enclosure temperature between -25°C and +70°C, preventing premature thermal aging. Additionally, if the local grid experiences frequent voltage sags, pairing it with an external time-delay device is highly recommended to avoid nuisance tripping.
1SDA073700R1 is an internal electrical accessory for smart low-voltage circuit breakers manufactured by ABB Electrification, officially defined as an Undervoltage Release (Undervoltage Coil, YU).
How should 1SDA073700R1 be used?
It must be inserted and secured into a designated internal slot within a compatible circuit breaker. It requires a continuous control power supply; the circuit breaker can only be closed when this coil is energized.
What is the core operating principle of 1SDA073700R1?
It is used to monitor control loop voltage. When the grid voltage is lost or drops between 35% and 70% of the rated voltage, the coil automatically releases, forcing the circuit breaker to trip open instantly.
What is the rated operating voltage of 1SDA073700R1?
Its rated control voltage is 220V–240V AC/DC, making it interoperable with both alternative and direct current standard industrial secondary control loops.
Is 1SDA073700R1 continuously energized?
Yes. It operates under a Continuous Duty cycle. As long as the circuit breaker is in operation and delivering power, this coil must remain constantly energized.
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Disclaimer: We are not an authorized distributor or distributor of the product manufacturer of this website, The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because our company is not an authorized distributor of this product, the Original Manufacturer`s warranty does not apply.While many DCS PLC products will have firmware already installed, Our company makes no representation as to whether a DSC PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. Our company also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from our company, its distributors, or any other source. Our company also makes no representations as to your right to install any such firmware on the product. Our company will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.
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