WEG UMBW-1C3-30

The WEG UMBW-1C3-30 is a 3-pole thermal-magnetic miniature circuit breaker (MCB) rated 32A at 277/480VAC with a C trip curve, designed for DIN rail mounting with toggle actuation and visual status indication. UL1077 listed for supplementary equipment protection, it features a positive trip-free snap-action mechanism for reliable switching, a compact 17.5mm width per pole, and a cuttable bus bar connecting system for flexible panel layouts. Part of WEG's UMBW series ranging from 1A to 63A in B, C, and D trip curves.
 
Key Specifications
Rated Current: 32A
Poles: 3
Trip Curve: C (5–10× In, general-purpose)
Maximum Voltage: 277/480VAC
Type: Thermal-Magnetic
UL Approval: UL1077 (Supplementary Protection)
Standards: EN 60947-2, UL 1077, UL 489 (series)
Mounting: DIN Rail
Width: 17.5 mm per pole (52.5 mm total)
Visual Status Indication: Yes
Mechanism: Positive Trip-Free Snap Action
Voltage Type: AC/DC (series options)
Series: WEG UMBW (1–63A, 1–3 poles, B/C/D curves)
 
Ideal for protecting three-phase circuits, lighting, small to medium motor loads, and general-purpose equipment in industrial control panels, machinery, and DIN-rail-mounted distribution. The C curve suits typical inductive loads such as transformers and motors.