Siemens 3VA9978-0BB11 Undervoltage Release (UVR), 24V DC Accessory for 3VA4/5/6 MCCB Original Brand New
$466.46
High-performance undervoltage release (UVR) accessory designed for 3VA4, 3VA5, and 3VA6 molded case circuit breakers. Operating at 24V DC, it ensures automatic tripping during voltage drops to protect your electrical systems.
Availability: In stock
Overview
The Siemens 3VA9978-0BB11 is an essential internal accessory for the Sentron 3VA series of molded case circuit breakers (MCCB). This undervoltage release unit is engineered to monitor control voltage and trigger the circuit breaker to trip if the voltage falls below a specific threshold (typically 35% to 70% of the rated voltage), preventing damage to sensitive downstream equipment.
Key Benefit
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Enhanced Safety: Automatically disconnects the circuit during power failures or significant voltage dips to prevent equipment restart hazards.
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Seamless Integration: Specifically designed for the Siemens 3VA4, 3VA5, and 3VA6 frame sizes for a perfect fit and reliable operation.
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Compact Design: Fits internally within the breaker housing, saving external panel space.
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Reliable Protection: Provides a fail-safe mechanism for emergency stop circuits when wired in series with NC contacts.
Function & Application
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Emergency Tripping: Can be used in conjunction with emergency stop buttons to provide a remote tripping function.
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Voltage Monitoring: Continuously monitors the 24V DC control circuit.
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Compatibility: Optimized for use with the Siemens Sentron 3VA global range of circuit breakers.
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| Weight | 0.106 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 |
| consumed active power / at DC / maximum | 2.5 W |
| 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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