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Available Now! 
Available Now!Noark
B1N2D50
Miniature Circuit Breaker, UL489, 2-Poles, D-Curve, 50A, 240VAC/125VDC, 10kA, Box Lugs
$36.87$36.87 -
Weg
UMBW-1D1-30
MCB, UL1077, 1-Pole, D-Curve, 30 Amp, 277VAC, 5kA, Thermal-Magnetic Miniature Circuit Breaker, IP20, UMBW Series
$11.75$11.75 -
LS Electric
0626051763
MCB, UL1077, 1-Pole, D-Curve, 5 Amp, 10kA, 120/240VAC, Thermal Magnetic Miniature Circuit Breaker
$6.68$6.68 -
LS Electric
0627039963
MCB, UL1077, 2-Pole, D-Curve, 20 Amp, 10kA, 240VAC, Thermal Magnetic Miniature Circuit Breaker
$14.31$14.31 -
LS Electric
0627040263
MCB, UL1077, 2-Pole, D-Curve, 40 Amp, 10kA, 240VAC, Thermal Magnetic Miniature Circuit Breaker
$14.31$14.31 -
LS Electric
0627057063
MCB, UL489, 2-Pole, D-Curve, 30 Amp, 10kA, 240VAC, Thermal Magnetic Miniature Circuit Breaker
$33.59$33.59 -
LS Electric
0628034463
MCB, UL1077, 3-Pole, D-Curve, 63 Amp, 6kA, 480Y/277VAC, Thermal Magnetic Miniature Circuit Breaker
$29.81$29.81 -
LS Electric
0628040963
MCB, UL489, 3-Pole, D-Curve, 20 Amp, 10kA, 480Y/277VAC, Thermal Magnetic Miniature Circuit Breaker
$55.44$55.44 -
Available Now! 
Available Now!ABL Sursum
1D4UR
Circuit Breaker, 1-Pole, D-Curve, 4 Amp, UL1077, 277VAC, 10kA, Supplementary Protection
$15.76$15.76 -
$56.18$56.18 -
Sprecher and Schuh
L8-7/1/D
Circuit Breaker, Supplementary Protector, D-Curve, 7 Amp, 277VAC/48VDC, 10kA, 1-Pole, UL1077 / NFPA79 / CSA / CE, IP20
$51.90$51.90 -
LS Electric
0626037163
MCB, UL1077, 1-Pole, D-Curve, 3 Amp, 6kA, 277VAC, Thermal Magnetic Miniature Circuit Breaker
$6.68$6.68
A circuit breaker will interrupt the flow of current in an electrical circuit, safeguarding surrounding electrical components and wiring by preventing circuit overloads and short circuits.
a.k.a. MCB, MCCB, molded case breaker, supplementary protection, UL1077, UL489, UL508, MMP, manual motor protector