SIEMENS Undervoltage Release 208-230V AC 50/60 Hz for 3VA Circuit Breakers (3VA99080BB25)

Undervoltage conditions can cause equipment to drop out unexpectedly, leaving motors and machinery in an unsafe state. The SIEMENS 3VA99080BB25 undervoltage release solves this by automatically tripping the connected 3VA molded case circuit breaker when the supply voltage falls below the rated threshold, preventing uncontrolled restarts and protecting downstream equipment.

Who is it for

Panel builders and maintenance engineers working with Siemens 3VA1 and 3VA2 molded case circuit breakers in industrial and commercial power distribution systems. This internal accessory is essential for applications where voltage monitoring and automatic disconnection are required for safety or process integrity.

Main features

• Rated operating voltage 208-230 V AC, 50/60 Hz
• Electromechanical tripping principle for reliable undervoltage detection
• Instantaneous tripping characteristic
• Includes 1 normally open and 1 normally closed auxiliary contact for status signaling
• Low power consumption of 3 VA
• Manual reset after voltage restoration
• Mounts internally in the circuit breaker, saving panel space
• Operating temperature range -25 to +70 °C

Specifications

• Compatibility: Siemens 3VA1 and 3VA2 molded case circuit breakers
• Rated operating voltage: 208-230 V AC
• Rated frequency: 50/60 Hz
• Power consumption: 3 VA
• Auxiliary contacts: 1 NO + 1 NC
• Electrical connection: Screw terminals
• Standards compliance: IEC 60947-2
• Degree of protection (terminals): IP20 when installed in MCCB
• Storage temperature range: -40 to +80 °C

Tips

Verify that the undervoltage release voltage rating matches your control circuit supply. The release must be manually reset after tripping, so ensure it is accessible for maintenance. For installations with frequent voltage fluctuations, consider adding a time delay module to avoid nuisance tripping.