Siemens 3VA9978-0BB24 Undervoltage Release (UVR), 120-127 V AC, 50/60 Hz Original Brand New
$459.57
High-performance undervoltage release accessory designed for use with 3VA4, 3VA5, and 3VA6 series molded case circuit breakers (MCCB). It ensures system safety by automatically tripping the breaker if the voltage drops below a specified threshold.
Availability: In stock
Overview
The Siemens 3VA9978-0BB24 is a critical internal accessory for the Sentron 3VA series. Operating at a voltage range of 120-127 V AC (50/60 Hz), this undervoltage release (UVR) provides an essential protective layer for industrial electrical circuits. It prevents equipment from restarting automatically after a power failure and protects sensitive loads from the damaging effects of brownouts or voltage dips.
Key Benefit
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Enhanced Safety: Automatically trips the circuit breaker during significant voltage drops to prevent equipment damage.
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Seamless Integration: Specifically engineered for a perfect fit within 3VA4, 3VA5, and 3VA6 frame sizes.
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Reliable Protection: Guards against unintentional machine restarts after a loss of power, meeting strict industrial safety standards.
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Global Compatibility: Supports both 50 Hz and 60 Hz frequencies, making it suitable for international electrical grids.
Function
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Remote Tripping: Allows the circuit breaker to be tripped remotely when integrated into a safety control circuit.
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Voltage Monitoring: Continuously monitors the incoming control supply voltage.
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Automatic Disconnection: If the voltage falls between 35% and 70% of the rated value, the UVR triggers the breaker to the “OFF” position.
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| Weight | 0.107 kg |
|---|---|
| Dimensions | 90.00 × 125.00 × 40.00 mm |
| Brand | SIEMENS |
| product brand name | SENTRON |
| product designation | Accessories |
| Product version | Auxiliary release |
| Accessories | Auxiliary release |
| Degree of pollution | 3 |
| Overvoltage category | III |
| apparent power consumption / maximum | 2 V·A |
| surge voltage resistance | 4 kV |
| Height | 65.1 mm |
| Width | 25.7 mm |
| number of slots | 3 |
| tightening torque / with screw-type terminals / minimum | 0.4 N·m |
| tightening torque / with screw-type terminals / maximum | 0.5 N·m |
| Type of auxiliary circuit connection | AWG18 / 750 mm |
| stripped length | 10 mm |
| stripped length [in] | 0.4 in |
| tightening torque [lbf·in] / with screw-type terminals / minimum | 3.5 lbf·in |
| tightening torque [lbf·in] / with screw-type terminals / maximum | 4.4 lbf·in |
| last modified: | 12/20/2020 |
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