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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  1. MCB, 1P, 277/60 VAC/DC, D Curve, 16A, UL 489
    MCB, 1-Pole, 277/60 VAC/DC, D-Curve, 16A, UL489, 1 UMBW-4D1-16
    13641992, Limited Availability! Replaced by UMBW-4D1-15 (14362949)
    $19.61
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  2. MCB, 1P, 277/60 VAC/DC, D Curve, 15A, UL 489
    MCB, 1-Pole, 277/60 VAC/DC, D-Curve, 15A, UL489, 1 UMBW-4D1-15
    14362949, This is the Recommended Replacement for UMBW-4D1-16 (13641992)
    $19.61
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  3. MCB, 1P, 277/60 VAC/DC, C Curve, 6A, UL 489
    MCB, 1-Pole, 277/60 VAC/DC, C-Curve, 6A, UL489, 10 UMBW-4C1-6
    13634519, This is the Recommended Replacement for UMBW-4B1-6 (14360410)
    $19.61
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  4. MCB, 1P, 277/60 VAC/DC, C Curve, 20A, UL 489
    MCB, 1-Pole, 277/60 VAC/DC, C-Curve, 20A, UL489, 1 UMBW-4C1-20
    13641127, This is the Recommended Replacement for UMBW-4B1-20 (14360260)
    $19.61
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  5. MCB, 1P, 277/60 VAC/DC, C Curve, 2A, UL 489
    MCB, 1-Pole, 277/60 VAC/DC, C-Curve, 2A, UL489, 10 UMBW-4C1-2
    13634259, This is the Recommended Replacement for UMBW-4B1-2 (14360177)
    $19.61
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  6. MCB, 1P, 277/60 VAC/DC, C Curve, 16A, UL 489
    MCB, 1-Pole, 277/60 VAC/DC, C-Curve, 16A, UL489, 1 UMBW-4C1-16
    13634520, Limited Availability! Replaced by UMBW-4C1-15 (14361805)
    $19.61
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  7. MCB, 1P, 277/60 VAC/DC, C Curve, 15A, UL 489
    MCB, 1-Pole, 277/60 VAC/DC, C-Curve, 15A, UL489, 1 UMBW-4C1-15
    14361805, This is the Recommended Replacement for UMBW-4B1-15 (14360169), UMBW-4B1-16 (14360170) and UMBW-4C1-16 (13634520)
    $19.61
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  8. MCB, 1P, 277/60 VAC/DC, C Curve, 10A, UL 489
    MCB, 1-Pole, 277/60 VAC/DC, C-Curve, 10A, UL489, 1 UMBW-4C1-10
    13634523, This is the Recommended Replacement for UMBW-4B1-10 (14360098)
    $19.61
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  9. MCB, 1P, 277/60 VAC/DC, C Curve, 1A, UL 489
    MCB, 1-Pole, 277/60 VAC/DC, C-Curve, 1A, UL489, 10 UMBW-4C1-1
    13634258, This is the Recommended Replacement for UMBW-4B1-1 (14359974)
    $19.61
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  10. MCB, 1P, 277/60 VAC/DC, C Curve, 4A, UL 489
    MCB, 1-Pole, 277/60 VAC/DC, C-Curve, 4A, UL489, 10 UMBW-4C1-4
    13338282, This is the Recommended Replacement for UMBW-4B1-4 (14360281)
    $19.61
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