UMBW Thermal-Magnetic Miniature Circuit Breakers
The WEG UMBW series of thermal-magnetic miniature circuit breakers (MCBs) provide reliable, high-performance protection for electrical systems. Designed to IEC and UL standards, these DIN-rail mounted breakers feature trip-free operation, multiple trip curves, wide voltage ratings, and a range of accessories to suit diverse applications.
Key Points
- Complies with IEC 60947-2, UL 1077, and UL 489 standards
- Supports AC (120 V, 230 V, 277 V, 480 V) and DC (60 V, 125 V) applications
- High interrupting capacity up to 10 kA depending on standard
- Optional accessories include auxiliary contacts, alarms, and shunt releases
- Available in 1P, 2P, and 3P configurations with ratings from 1–63 A
- Trip curves B, C, and D for versatile protection requirements
- Long service life: 10,000 electrical and 20,000 mechanical cycles
- Operating temperature range: -35 °C to +70 °C