Circuit Breakers

(a.k.a. mini breakers, MCB, MCCB, molded case breaker, supplementary protection)

The basics: a circuit breaker is a device that will interrupt the flow of current in an electrical circuit. This protects the surrounding electrical components and wiring from damage by electrical overloads or short circuits.
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Items 1-12 of 2366

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  1. MCB, 1P, 277 VAC, B Curve, 20A, UL1077, 5kA
    MCB, 1-Pole, 277VAC, B-Curve, 20A, UL1077, 5kA, Mi UMBW-1B1-20
    14351012, Limited Availability, Replaced by UMBW-1C2-20 (13915501)
    $9.25
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  2. MCB, 1P, 277 VAC, B Curve, 16A, UL1077, 5kA
    MCB, 1-Pole, 277VAC, B-Curve, 16A, UL1077, 5kA, Mi UMBW-1B1-16
    14350148, Limited Availability, Replaced by UMBW-1C1-15 (14353581)
    $9.25
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  3. MCB, 1P, 277 VAC, C Curve, 5A, UL1077, 5kA
    MCB, 1-Pole, 277VAC, C-Curve, 5A, UL1077, 5kA, Min UMBW-1C1-5
    14353585, This is the Recommended Replacement for UMBW-1B1-5 (14361538)
    $9.25
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  4. MCB, 1P, 277 VAC, C Curve, 20A, UL1077, 5kA
    MCB, 1-Pole, 277VAC, C-Curve, 20A, UL1077, 5kA, Mi UMBW-1C1-20
    13912234, This is the Recommended Replacement for UMBW-1B1-20 (14351012)
    $9.25
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  5. MCB, 1P, 277 VAC, C Curve, 15A, UL1077, 5kA
    MCB, 1-Pole, 277VAC, C-Curve, 15A, UL1077, 5kA, Mi UMBW-1C1-15
    14353581, This is the Recommended Replacement for UMBW-1B1-15 (14361512), UMBW-1B1-16 (14350148)
    $9.25
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