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Circuit Breakers
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Items 1-10 of 399

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  1. UMBW-4C1-4
    UMBW-4C1-4
    WEG Electric Circuit Breakers, UMBW Series
    Item Number
    UMBW-4C1-4
    MFG Item Number
    UMBW-4C1-4
    Series
    UMBW
    Product Description
    Circuit Breaker, 1-P, 4A/277VAC, C,
    Specifications
    Specifications
    Poles 1
    Current Rating 4 A
    Protection Branch Circuit
    Trip Curve C
    Terminals Included Line and Load
    Trip Unit Fixed Thermal / Fixed Magnetic
    Mounting DIN Rail
    UL Standard 489
    Neutral Pole No
    kAIC @ 277 VAC 10
    kAIC @ 60 VDC 10
    Terminal Type Screw
    Auxiliary Switch Optional
    Shunt Trip Optional
    Undervoltage Release No
    Alarm Switch Optional
    Busbar Optional
    Increase
    Decrease
    Compare Item
    Availability
    Order by 5:00 PM ET and your package will ship the same day.
  2. UMBW-1D3-50
    UMBW-1D3-50
    WEG Electric Circuit Breakers, UMBW Series
    Item Number
    UMBW-1D3-50
    MFG Item Number
    UMBW-1D3-50
    Series
    UMBW
    Product Description
    MCB 1077 480VAC D 3P 50A
    Specifications
    Specifications
    Poles 3
    Current Rating 50 A
    Max Voltage 480 VAC
    Protection Supplemental
    Trip Curve D
    Terminals Included Line and Load
    Trip Unit Fixed Thermal / Fixed Magnetic
    Mounting DIN Rail
    UL Standard 1077
    Neutral Pole No
    kAIC @ 277/480 VAC 5
    Terminal Type Screw
    Auxiliary Switch Optional
    Shunt Trip Optional
    Undervoltage Release No
    Alarm Switch Optional
    Busbar Optional
    Increase
    Decrease
    Compare Item
    Availability
    Order by 5:00 PM ET and your package will ship the same day.
  3. UMBW-4C1-6
    UMBW-4C1-6
    WEG Electric Circuit Breakers, UMBW Series
    Item Number
    UMBW-4C1-6
    MFG Item Number
    UMBW-4C1-6
    Series
    UMBW
    Product Description
    Circuit Breaker, 1-P, 6A/277VAC, C,
    Specifications
    Specifications
    Poles 1
    Current Rating 6 A
    Protection Branch Circuit
    Trip Curve C
    Terminals Included Line and Load
    Trip Unit Fixed Thermal / Fixed Magnetic
    Mounting DIN Rail
    UL Standard 489
    Neutral Pole No
    kAIC @ 277 VAC 10
    kAIC @ 60 VDC 10
    Terminal Type Screw
    Auxiliary Switch Optional
    Shunt Trip Optional
    Undervoltage Release No
    Alarm Switch Optional
    Busbar Optional
    Increase
    Decrease
    Compare Item
    Availability
    Order by 5:00 PM ET and your package will ship the same day.
  4. UMBW-1C1-10
    UMBW-1C1-10
    WEG Electric Circuit Breakers, UMBW Series
    Item Number
    UMBW-1C1-10
    MFG Item Number
    UMBW-1C1-10
    Series
    UMBW
    Product Description
    MCB 1077 277VAC C 1P 10A
    Specifications
    Specifications
    Poles 1
    Current Rating 10 A
    Max Voltage 277 VAC
    Protection Supplemental
    Trip Curve C
    Terminals Included Line and Load
    Trip Unit Fixed Thermal / Fixed Magnetic
    Mounting DIN Rail
    UL Standard 1077
    Neutral Pole No
    kAIC @ 277 VAC 5
    Terminal Type Screw
    Auxiliary Switch Optional
    Shunt Trip Optional
    Undervoltage Release No
    Alarm Switch Optional
    Busbar Optional
    Increase
    Decrease
    Compare Item
    Availability
    Order by 5:00 PM ET and your package will ship the same day.
  5. UMBW-1C3-5
    UMBW-1C3-5
    WEG Electric Circuit Breakers, UMBW Series
    Item Number
    UMBW-1C3-5
    MFG Item Number
    UMBW-1C3-5
    Series
    UMBW
    Product Description
    MCB UL1077 277/480V C 3P 5A, J2
    Specifications
    Specifications
    Poles 3
    Current Rating 5 A
    Protection Supplemental
    Trip Curve C
    Terminals Included Line and Load
    Trip Unit Fixed Thermal / Fixed Magnetic
    Mounting DIN Rail
    UL Standard 1077
    IEC Standard 60947-2
    Neutral Pole No
    kAIC @ 240 VAC 5
    kAIC @ 277/480 VAC 5
    Terminal Type Screw
    Auxiliary Switch Optional
    Shunt Trip Optional
    Undervoltage Release No
    Alarm Switch Optional
    Busbar Optional
    Increase
    Decrease
    Compare Item
    Availability
    Order by 5:00 PM ET and your package will ship the same day.
  6. UMBW-1D1-20
    UMBW-1D1-20
    WEG Electric Circuit Breakers, UMBW Series
    Item Number
    UMBW-1D1-20
    MFG Item Number
    UMBW-1D1-20
    Series
    UMBW
    Product Description
    MCB 1077 277VAC D 1P 20A
    Specifications
    Specifications
    Poles 1
    Current Rating 20 A
    Max Voltage 277 VAC
    Protection Supplemental
    Trip Curve D
    Terminals Included Line and Load
    Trip Unit Fixed Thermal / Fixed Magnetic
    Mounting DIN Rail
    UL Standard 1077
    Neutral Pole No
    kAIC @ 277 VAC 5
    Terminal Type Screw
    Auxiliary Switch Optional
    Shunt Trip Optional
    Undervoltage Release No
    Alarm Switch Optional
    Busbar Optional
    Increase
    Decrease
    Compare Item
    Availability
    Order by 5:00 PM ET and your package will ship the same day.
  7. UMBW-1D2-32
    UMBW-1D2-32
    WEG Electric Circuit Breakers, UMBW Series
    Item Number
    UMBW-1D2-32
    MFG Item Number
    UMBW-1D2-32
    Series
    UMBW
    Product Description
    MCB 1077 480VAC D 2P 32A
    Specifications
    Specifications
    Poles 2
    Current Rating 32 A
    Max Voltage 480 VAC
    Protection Supplemental
    Trip Curve D
    Terminals Included Line and Load
    Trip Unit Fixed Thermal / Fixed Magnetic
    Mounting DIN Rail
    UL Standard 1077
    Neutral Pole No
    kAIC @ 277/480 VAC 5
    Terminal Type Screw
    Auxiliary Switch Optional
    Shunt Trip Optional
    Undervoltage Release No
    Alarm Switch Optional
    Busbar Optional
    Increase
    Decrease
    Compare Item
    Availability
    Order by 5:00 PM ET and your package will ship the same day.
  8. UMBW-1D2-40
    UMBW-1D2-40
    WEG Electric Circuit Breakers, UMBW Series
    Item Number
    UMBW-1D2-40
    MFG Item Number
    UMBW-1D2-40
    Series
    UMBW
    Product Description
    MCB 1077 480VAC D 2P 40A
    Specifications
    Specifications
    Poles 2
    Current Rating 40 A
    Max Voltage 480 VAC
    Protection Supplemental
    Trip Curve D
    Terminals Included Line and Load
    Trip Unit Fixed Thermal / Fixed Magnetic
    Mounting DIN Rail
    UL Standard 1077
    Neutral Pole No
    kAIC @ 277/480 VAC 5
    Terminal Type Screw
    Auxiliary Switch Optional
    Shunt Trip Optional
    Undervoltage Release No
    Alarm Switch Optional
    Busbar Optional
    Increase
    Decrease
    Compare Item
    Availability
    Order by 5:00 PM ET and your package will ship the same day.
  9. UMBW-1D2-63
    UMBW-1D2-63
    WEG Electric Circuit Breakers, UMBW Series
    Item Number
    UMBW-1D2-63
    MFG Item Number
    UMBW-1D2-63
    Series
    UMBW
    Product Description
    MCB 1077 480VAC D 2P 63A
    Specifications
    Specifications
    Poles 2
    Current Rating 63 A
    Max Voltage 480 VAC
    Protection Supplemental
    Trip Curve D
    Terminals Included Line and Load
    Trip Unit Fixed Thermal / Fixed Magnetic
    Mounting DIN Rail
    UL Standard 1077
    Neutral Pole No
    kAIC @ 277/480 VAC 5
    Terminal Type Screw
    Auxiliary Switch Optional
    Shunt Trip Optional
    Undervoltage Release No
    Alarm Switch Optional
    Busbar Optional
    Increase
    Decrease
    Compare Item
    Availability
    Order by 5:00 PM ET and your package will ship the same day.
  10. UMBW-1D3-10
    UMBW-1D3-10
    WEG Electric Circuit Breakers, UMBW Series
    Item Number
    UMBW-1D3-10
    MFG Item Number
    UMBW-1D3-10
    Series
    UMBW
    Product Description
    MCB 1077 480VAC D 3P 10A
    Specifications
    Specifications
    Poles 3
    Current Rating 10 A
    Max Voltage 480 VAC
    Protection Supplemental
    Trip Curve D
    Terminals Included Line and Load
    Trip Unit Fixed Thermal / Fixed Magnetic
    Mounting DIN Rail
    UL Standard 1077
    Neutral Pole No
    kAIC @ 277/480 VAC 5
    Terminal Type Screw
    Auxiliary Switch Optional
    Shunt Trip Optional
    Undervoltage Release No
    Alarm Switch Optional
    Busbar Optional
    Increase
    Decrease
    Compare Item
    Availability
    Order by 5:00 PM ET and your package will ship the same day.
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kAIC @ 120 VAC
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kAIC @ 125 VDC
kAIC @ 277/480 VAC
kAIC @ 277 VAC
kAIC @ 60 VDC
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Trip Curve
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kAIC @ 240 VAC
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Circuit Protection

Circuit breakers and fuses protect against overload and short circuits for all types of applications.

A circuit breaker is an automatically-operated electrical switch designed to protect an electrical circuit from damage caused by excess current, typically resulting from an overload or short circuit. The circuit breaker trips to interrupt the circuit, and be reset and reused.
Fuses provide the same protections. If too much current flows through the fuse, a metal link in the fuse body will melt and interrupt the circuit. A fuse can only trip and open the circuit once, so it must be replaced or repaired to complete the circuit again. Fuses are typically installed in fuse blocks, either for storage or to consolidate fuses in one, easily maintained location.

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