WEG UMBW-1B1-8 is a 1-pole miniature circuit breaker (MCB) rated for 8A at 277/480V AC. It features a B trip curve for general-purpose protection of lighting and distribution circuits, with a 10kA interrupting capacity. This UL1077 supplementary protector is designed for DIN rail mounting in industrial control panels and electrical enclosures.

The UMBW has a range from 1 to 63 Amps, available in 1,2, 3 poles, and B, C, D trip curves. Single pole and multi-pole thermal-magnetic miniature circuit breakers (MCBs) are in accordance with EN 60947-2, UL 1077 and UL 489 for DIN rail mounting with toggle actuation, visual status indication, and high interrupt capacity. A positively trip-free snap action mechanism ensures reliable switching behavior. A range of trip characteristics and add-on accessories make the UMBW suitable for a variety of applications.

• AC and DC voltages available in one series;
• UL489 branch circuit protective device;
• UL1077 equipment protection;
• 17.5mm width per pole;
• Visual status indication;
• Positive trip-free snap action mechanism to ensure reliable switching;
• Cuttable bus bar connecting system.