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Circuit Breakers

Miniature Circuit Breakers from 1 to 63 AMP in B, C and D trip curves

When deciding which miniature circuit breaker is best for any application, it is important to determine what type of protection is necessary.  For these MCB's, there are two important factors to consider when choosing which breaker is appropriate:

  1. Supplementary or Branch Circuit Protection
    1. Supplementary protectors are the most common type, but since branch circuit protection is not required, a separate device such as a fuse or molded case circuit breaker must be used upstream
    2. Branch Circuit protectors  are listed as a primary protection device and can be used alone without the need for an additional protection device

Determining the trip curve needed for your miniature circuit breaker

Miniature circuit breakers can come in 7 different trip curve ratings, with B, C and D being the most common.  It is imperative that the correct trip curve is chosen the effectively protect the equipment that is downstream from this device.  Listed below are the three most common trip curves along with a brief description of suitable applications:

  1. B-curve : Suitable for applications where protection against low level short circuit faults in control wiring is desired.  Instantaneous trip is 3 to 5 x continuous rating of device (In). Applications include PLC wiring, business equipment,
    lighting, appliances and some motors. Low magnetic trip point.
  2. C-Curve : Suitable for applications where medium levels of inrush current are expected. Instantaneous trip is 5 to 10 x rating of device (In). Applications include small transformers, lighting, pilot devices, control circuits, and coils. Medium magnetic trip point.
  3. D-curve : Suitable for applications where high levels of inrush current are expected. Instantaneous trip is 10 to 20 x rating of device (In). The high magnetic trip point prevents nuisance tripping in high inductive applications such as motors, transformers, and power supplies.
  • 1492-SP

    1492-SP

    Allen Bradley AB 1492-SP single pole miniature supplementary circuit breaker with either B, C or D trip characteristic and possible AMP ranges from 2-20 AMPS   These Allen Bradley 1492 circuit breakers are offered as a broad portfolio of pole...

    MSRP: $52.17
    $31.89
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  • 1492-SPM1C100 miniature circuit breaker 1492-SPM1C100

    1492-SPM1C100

    Allen Bradley AB 1492-SPM1C100 single pole miniature supplementary circuit breaker rated for 10 AMPS with a C trip curve rating for medium levels of inrush current. expected. Instantaneous trip is 5 to 10 x rating of device (In). Applications...

    MSRP: $52.17
    $31.89
    Add to Cart
  • NZM2 Cover

    Eaton / Moeller NZM2 replacement cover for all NZMB2, NZMN2, NZMH2 and NS2 Moeller molded case circuit breakers.  This replacement cover is used when attaching any rotary handle assembly of either direct mount or through the door operators.  

    MSRP: $110.00
    $61.59
    Add to Cart
  • TS250NU-FTU-LL-150

    LS / Susol TS250NU 35kA, 150 AMP, 3 pole molded case circuit breaker (MCCB) with fixed thermal and fixed magnetic trip unit and line and load side lugs. Click here to view a PDF file on this LG Circuit Breaker On TD125U to TS800U circuit breakers, the...

    MSRP: $747.01
    $418.32
    Add to Cart
  • 1492-SPM1C150 miniature circuit breaker 1492-SPM1C150

    1492-SPM1C150

    Allen Bradley AB 1492-SPM1C150 single pole miniature supplementary circuit breaker rated for 15 AMPS with a C trip curve rating for medium levels of inrush current. expected. Instantaneous trip is 5 to 10 x rating of device (In). Applications...

    MSRP: $52.17
    $31.89
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  • NZMB1-A100-NA

    3-Pole Circuit Breaker with Basic Switching Capacity and a thermomagnetic release. 100 AMP with a 600A-1000A short-circuit release and an adjustable overload release from 80A-100A. Line and Load Box Lugs Installed.

    MSRP: $521.00
    $480.30
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  • NZMB2-A63-BT-NA

    3-Pole Circuit Breaker with Basic Switching Capacity and a thermomagnetic release. 63 AMP with a 380A-630A short-circuit release and an adjustable overload release from 50A-63A. Line and Load Box Lugs Installed.

    MSRP: $466.00
    $406.41
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  • TD125NU-FMU-LL-80

    LS / Susol TD125NU 35kA, 80 AMP, 3 pole molded case circuit breaker (MCCB) with adjustable thermal and fixed magnetic trip unit and line and load side lugs. Click here to view a PDF file on this LG Circuit Breaker On TD125U to TS800U circuit breakers,...

    MSRP: $468.95
    $0.00
  • 1492-SPM1C010 miniature circuit breaker 1492-SPM1C010

    1492-SPM1C010

    Allen Bradley AB 1492-SPM1C010 single pole miniature supplementary circuit breaker rated for 1 AMP with a C trip curve rating for medium levels of inrush current. expected. Instantaneous trip is 5 to 10 x rating of device (In). Applications include...

    MSRP: $52.17
    $31.89
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  • 1492-SPM1C020 miniature circuit breaker 1492-SPM1C020

    1492-SPM1C020

    Allen Bradley 1492-SPM1C020 single pole miniature supplementary circuit breaker rated for 2 AMP with a C trip curve rating for medium levels of inrush current expected. Instantaneous trip is 5 to 10 x rating of device (In). Applications include small...

    MSRP: $52.17
    $31.89
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  • 1492-SPM1C030 miniature circuit breaker 1492-SPM1C030

    1492-SPM1C030

    Allen Bradley AB 1492-SPM1C030 single pole miniature supplementary circuit breaker rated for 3 AMP with a C trip curve rating for medium levels of inrush current. expected. Instantaneous trip is 5 to 10 x rating of device (In). Applications include...

    MSRP: $52.17
    $31.89
    Add to Cart
  • 1492-SPM1C040 miniature circuit breaker 1492-SPM1C040

    1492-SPM1C040

    Allen Bradley AB 1492-SPM1C040 single pole miniature supplementary circuit breaker rated for 4 AMPS with a C trip curve rating for medium levels of inrush current. expected. Instantaneous trip is 5 to 10 x rating of device (In). Applications include...

    MSRP: $52.17
    $31.89
    Add to Cart