Description
Product Overview
Siemens designs all auxiliary and alarm switches as changeover contacts, providing high flexibility for planning and installation.
Trip alarm switches signal every circuit breaker trip, regardless of the cause of the trip (RS 874-4512and 874-4515)
The electrical alarm switches activate immediately when the main contacts of the molded case circuit breaker open due to an ETU trip (RS 874-4519)
Short circuit alarm switches signal trips only if they have been initiated by a short circuit (RS 874-4528)
Undervoltage releases trip the molded case circuit breaker in the event that the rated voltage fails or drops to between 70 % and 35 % of its normal value (in compliance with the relevant standard)
You can fit STL-type shunt trips in the left-hand accessories compartment as an alternative to an undervoltage release. They come in five rated voltages:
Performance & Reliability
The Siemens 3VA9908-0BB25 ensures reliable circuit breaker operation even under voltage fluctuations. Its components are tested for durability, ensuring long-term protection. Moreover, its precise tripping action prevents equipment damage and enhances system safety.
Applications & Integration
This undervoltage release is ideal for industrial, commercial, and critical electrical installations. Additionally, it integrates seamlessly with Siemens 3VA MCCBs, providing efficient signaling and protection. Engineers can combine auxiliary, alarm, and shunt trips to customize control systems effectively.
Safety & Efficiency
The 3VA9908-0BB25 enhances operator and equipment safety by ensuring breakers trip reliably during undervoltage events. Furthermore, changeover contact design allows flexible wiring, reducing installation complexity and improving operational efficiency.
Overall, the Siemens 3VA9908-0BB25 undervoltage release delivers robust protection, versatile integration, and reliable signaling. It is essential for modern automation systems requiring safe and efficient MCCB operation.
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