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Circuit Breakers
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Items 1-10 of 606

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  1. ST202M-K16
    ST202M-K16
    ABB Circuit Breakers, ST200M Series
    Item Number
    ST202M-K16
    MFG Item Number
    ST202M-K16
    Series
    ST200M
    Product Description
    Circuit Breaker, 2-P, 16A/480V, K,
    Specifications
    Specifications
    Poles 2
    Current Rating 16 A
    Protection Supplemental
    Trip Curve K
    Terminals Included Line and Load
    Trip Unit Fixed Thermal / Fixed Magnetic
    Mounting DIN Rail
    UL Standard 1077
    CSA Standard 22.2
    IEC Standard 60947-2
    Neutral Pole No
    kAIC @ 240 VAC 10
    kAIC @ 277 VAC 5
    kAIC @ 480 VAC 10
    kAIC @ 60 VDC 10
    kAIC @ 125 VDC 10
    Terminal Type Screw
    Auxiliary Switch Optional
    Shunt Trip Optional
    Undervoltage Release Optional
    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. ST203M-K50
    ST203M-K50
    ABB Circuit Breakers, ST200M Series
    Item Number
    ST203M-K50
    MFG Item Number
    ST203M-K50
    Series
    ST200M
    Product Description
    Circuit Breaker, 3-P, 50A/480V, K,
    Specifications
    Specifications
    Poles 3
    Current Rating 50 A
    Protection Supplemental
    Trip Curve K
    Terminals Included Line and Load
    Trip Unit Fixed Thermal / Fixed Magnetic
    Mounting DIN Rail
    UL Standard 1077
    CSA Standard 22.2
    IEC Standard 60947-2
    Neutral Pole No
    kAIC @ 240 VAC 10
    kAIC @ 277 VAC 5
    kAIC @ 480 VAC 10
    kAIC @ 60 VDC 10
    kAIC @ 125 VDC 10
    Terminal Type Screw
    Auxiliary Switch Optional
    Shunt Trip Optional
    Undervoltage Release Optional
    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. ST202M-K10
    ST202M-K10
    ABB Circuit Breakers, ST200M Series
    Item Number
    ST202M-K10
    MFG Item Number
    ST202M-K10
    Series
    ST200M
    Product Description
    Circuit Breaker, 2-P, 10A/480V, K,
    Specifications
    Specifications
    Poles 2
    Current Rating 10 A
    Protection Supplemental
    Trip Curve K
    Terminals Included Line and Load
    Trip Unit Fixed Thermal / Fixed Magnetic
    Mounting DIN Rail
    UL Standard 1077
    CSA Standard 22.2
    IEC Standard 60947-2
    Neutral Pole No
    kAIC @ 240 VAC 10
    kAIC @ 277 VAC 5
    kAIC @ 480 VAC 10
    kAIC @ 60 VDC 10
    kAIC @ 125 VDC 10
    Terminal Type Screw
    Auxiliary Switch Optional
    Shunt Trip Optional
    Undervoltage Release Optional
    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. ST202M-K6
    ST202M-K6
    ABB Circuit Breakers, ST200M Series
    Item Number
    ST202M-K6
    MFG Item Number
    ST202M-K6
    Series
    ST200M
    Product Description
    Circuit Breaker, 2-P, 6A/480V, K,
    Specifications
    Specifications
    Poles 2
    Current Rating 6 A
    Protection Supplemental
    Trip Curve K
    Terminals Included Line and Load
    Trip Unit Fixed Thermal / Fixed Magnetic
    Mounting DIN Rail
    UL Standard 1077
    CSA Standard 22.2
    IEC Standard 60947-2
    Neutral Pole No
    kAIC @ 240 VAC 10
    kAIC @ 277 VAC 5
    kAIC @ 480 VAC 10
    kAIC @ 60 VDC 10
    kAIC @ 125 VDC 10
    Terminal Type Screw
    Auxiliary Switch Optional
    Shunt Trip Optional
    Undervoltage Release Optional
    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. ST201M-K10
    ST201M-K10
    ABB Circuit Breakers, ST200M Series
    Item Number
    ST201M-K10
    MFG Item Number
    ST201M-K10
    Series
    ST200M
    Product Description
    Circuit Breaker, 1-P, 10A/277VAC, K,
    Specifications
    Specifications
    Poles 1
    Current Rating 10 A
    Protection Supplemental
    Trip Curve K
    Terminals Included Line and Load
    Trip Unit Fixed Thermal / Fixed Magnetic
    Mounting DIN Rail
    UL Standard 1077
    CSA Standard 22.2
    IEC Standard 60947-2
    Neutral Pole No
    kAIC @ 240 VAC 10
    kAIC @ 277 VAC 5
    kAIC @ 480 VAC 10
    kAIC @ 60 VDC 10
    kAIC @ 125 VDC 10
    Terminal Type Screw
    Auxiliary Switch Optional
    Shunt Trip Optional
    Undervoltage Release Optional
    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. ST201M-K20
    ST201M-K20
    ABB Circuit Breakers, ST200M Series
    Item Number
    ST201M-K20
    MFG Item Number
    ST201M-K20
    Series
    ST200M
    Product Description
    Circuit Breaker, 1-P, 20A/277VAC, K,
    Specifications
    Specifications
    Poles 1
    Current Rating 20 A
    Protection Supplemental
    Trip Curve K
    Terminals Included Line and Load
    Trip Unit Fixed Thermal / Fixed Magnetic
    Mounting DIN Rail
    UL Standard 1077
    CSA Standard 22.2
    IEC Standard 60947-2
    Neutral Pole No
    kAIC @ 240 VAC 10
    kAIC @ 277 VAC 5
    kAIC @ 480 VAC 10
    kAIC @ 60 VDC 10
    kAIC @ 125 VDC 10
    Terminal Type Screw
    Auxiliary Switch Optional
    Shunt Trip Optional
    Undervoltage Release Optional
    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. ST202M-D6
    ST202M-D6
    ABB Circuit Breakers, ST200M Series
    Item Number
    ST202M-D6
    MFG Item Number
    ST202M-D6
    Series
    ST200M
    Product Description
    Circuit Breaker, 2-P, 6A/480V, D,
    Specifications
    Specifications
    Poles 2
    Current Rating 6 A
    Protection Supplemental
    Trip Curve D
    Terminals Included Line and Load
    Trip Unit Fixed Thermal / Fixed Magnetic
    Mounting DIN Rail
    UL Standard 1077
    CSA Standard 22.2
    IEC Standard 60947-2
    Neutral Pole No
    kAIC @ 240 VAC 10
    kAIC @ 277 VAC 5
    kAIC @ 480 VAC 10
    kAIC @ 60 VDC 10
    kAIC @ 125 VDC 10
    Terminal Type Screw
    Auxiliary Switch Optional
    Shunt Trip Optional
    Undervoltage Release Optional
    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. ST201M-B10
    ST201M-B10
    ABB Circuit Breakers, ST200M Series
    Item Number
    ST201M-B10
    MFG Item Number
    ST201M-B10
    Series
    ST200M
    Product Description
    Circuit Breaker, 1-P, 10A/277VAC, B,
    Specifications
    Specifications
    Poles 1
    Current Rating 10 A
    Protection Supplemental
    Trip Curve B
    Terminals Included Line and Load
    Trip Unit Fixed Thermal / Fixed Magnetic
    Mounting DIN Rail
    UL Standard 1077
    CSA Standard 22.2
    IEC Standard 60947-2
    Neutral Pole No
    kAIC @ 240 VAC 10
    kAIC @ 277 VAC 5
    kAIC @ 480 VAC 10
    kAIC @ 60 VDC 10
    kAIC @ 125 VDC 10
    Terminal Type Screw
    Auxiliary Switch Optional
    Shunt Trip Optional
    Undervoltage Release Optional
    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. ST201M-K1
    ST201M-K1
    ABB Circuit Breakers, ST200M Series
    Item Number
    ST201M-K1
    MFG Item Number
    ST201M-K1
    Series
    ST200M
    Product Description
    Circuit Breaker, 1-P, 1A/277VAC, K,
    Specifications
    Specifications
    Poles 1
    Current Rating 1 A
    Protection Supplemental
    Trip Curve K
    Terminals Included Line and Load
    Trip Unit Fixed Thermal / Fixed Magnetic
    Mounting DIN Rail
    UL Standard 1077
    CSA Standard 22.2
    IEC Standard 60947-2
    Neutral Pole No
    kAIC @ 240 VAC 10
    kAIC @ 277 VAC 5
    kAIC @ 480 VAC 10
    kAIC @ 60 VDC 10
    kAIC @ 125 VDC 10
    Terminal Type Screw
    Auxiliary Switch Optional
    Shunt Trip Optional
    Undervoltage Release Optional
    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. ST203M-K32
    ST203M-K32
    ABB Circuit Breakers, ST200M Series
    Item Number
    ST203M-K32
    MFG Item Number
    ST203M-K32
    Series
    ST200M
    Product Description
    Circuit Breaker, 3-P, 32A/480V, K,
    Specifications
    Specifications
    Poles 3
    Current Rating 32 A
    Protection Supplemental
    Trip Curve K
    Terminals Included Line and Load
    Trip Unit Fixed Thermal / Fixed Magnetic
    Mounting DIN Rail
    UL Standard 1077
    CSA Standard 22.2
    IEC Standard 60947-2
    Neutral Pole No
    kAIC @ 240 VAC 10
    kAIC @ 277 VAC 5
    kAIC @ 480 VAC 10
    kAIC @ 60 VDC 10
    kAIC @ 125 VDC 10
    Terminal Type Screw
    Auxiliary Switch Optional
    Shunt Trip Optional
    Undervoltage Release Optional
    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 @ 125 VDC
kAIC @ 277 VAC
kAIC @ 60 VDC
Terminals Included
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Current Rating
Trip Curve
kAIC @ 480 VAC
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Neutral Pole
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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