UL1077 Miniature Breakers (Supplementary Protectors)

Miniature UL 1077 Breakers PDF 

Overview 

WEG UL1077 miniature breakers deliver reliable supplementary protection inside equipment and control panels. Built on WEG’s proven thermal-magnetic technology, these compact, DIN-rail devices help safeguard power supplies, PLCs, control circuits, and other sensitive loads against overloads and short-circuits—without taking up valuable panel space. Use them downstream of a UL 489 branch-circuit device for targeted, fast fault isolation and quicker maintenance.

Key Benefits

• UL 1077 Listed supplementary protectors for use within equipment
• Thermal-magnetic trip mechanism for dependable overload and short-circuit response
• Compact DIN-rail footprint to maximize panel density and simplify retrofits
• Clear ON/OFF indication and positive trip for easy status checks
• Fast, tool-free installation with standard rail mounting and line/load markings
• Coordinated protection when used downstream of fuses or UL 489 breakers
• Accessory options (such as auxiliaries or lockout solutions) to match your application needs*

*Accessory availability varies by model/series.

Typical Applications

• Industrial control panels and OEM machinery
• Power supplies, PLC and I/O protection, and instrumentation loops
• Control transformers, relays, solenoids, and small motors
• HVAC and building automation panels
• Conveyors, packaging equipment, and process skids

Why WEG

• Proven performance: Robust construction engineered for demanding environments
• Panel-builder friendly: Intuitive labeling and consistent terminal design
• Global support: WEG’s worldwide footprint and technical assistance

Important: UL1077 miniature breakers are supplementary protectors. They are not a substitute for branch-circuit protection. Always provide upstream UL 489 protection per applicable codes and standards.