- August 04, 2022
Siemens has developed new, highly flexible molded case circuit breaker (MCCB) frame sizes for high current applications to perfectly address the needs of switchgear manufacturers and panel builders in an environment characterized by increasing complexity, digitalization and cost pressures. The new 3VA UL Large Frame MCCBs enable users to implement powerful, safe and smart systems while allowing them to improve and greatly simplify their work processes.
These 3VA UL Large Frame MCCBs can be used worldwide. The 1,200 A and 1,600 A frame sizes meet the requirements of IEC and UL standards. This is particularly advantageous for manufacturers who are producing systems destined for global markets. The new 2,000 A frame is designed exclusively for the UL market. The new frame sizes will be available in both thermal-magnetic and electronic trip unit versions. Molded case switch (MCS) variants will also be offered.
The primary responsibility of MCCBs is to protect personnel and equipment against electrical damage and failures. The integrated arc energy reduction feature (Dynamic Arc Flash Sentry, DAS+) ensures that new 3VA UL Large Frame MCCBs trip more rapidly in the event of a fault during work being carried out in the immediate vicinity of live parts. In this way, the arc energy and thus the energy released in the power distribution equipment room is reduced. This technology is in compliance with the National Electric Code (NEC) for the US market; it is designed to protect service technicians from serious injury resulting from arc flash hazards.
The 3VA UL Large Frame electronic trip unit versions offer fully integrated communication and measurement features. Energy and circuit breaker data is recorded with an accuracy of +/-1% and transmitted to higher-level systems. This functionality is integrated into the electronic trip unit (ETU) and no longer requires additional accessories to be mounted in the circuit breaker. In addition, all 3VA MCCB frame sizes (125 - 2,000 A) use common internal accessories. This allows for flexible functional adjustments, lowers inventory levels, simplifies planning and selection, and reduces overall time and costs.