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Mini Circuit Breakers

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We offer several lines of Miniature circuit breakers from Square D, Phoenix Contact, and ABB. MCBs are available as complete units that can be DIN rail mounted, or as plug-in units with bases.

Miniature circuit breakers (MCB) are compact circuit breakers with low current ratings and fixed trip settings used to switch and protect the lowest common distribution voltage in an electrical system. MCBs are available as complete units, or as plug-in units with bases.

Miniature circuit breakers may be simple breakers without a UL listing, or supplementary circuit breakers (UL 489 listed, UL 1077 recognized, or UL 2367 recognized to protect single devices), or branch circuit breakers (UL 489 listed to protect single or multiple devices).

 

 

ABB Miniature Circuit Breakers
Phoenix Contact Miniature Circuit Breakers
Square D Schneider Electric Miniature Circuit Breakers
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ABB SU204MR-K63 SU204MR-K63 MCB K-Char., 10kA, 63A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K63 SU204MR-K63 MCB K-Char., 10kA, 63A, 4P, RTT UL 489, Ring Cable Lug
$652.14
SU204MR-K63 MCB K-Char., 10kA, 63A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K60 SU204MR-K60 MCB K-Char., 10kA, 60A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K60 SU204MR-K60 MCB K-Char., 10kA, 60A, 4P, RTT UL 489, Ring Cable Lug
$606.05
SU204MR-K60 MCB K-Char., 10kA, 60A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K50 SU204MR-K50 MCB K-Char., 10kA, 50A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K50 SU204MR-K50 MCB K-Char., 10kA, 50A, 4P, RTT UL 489, Ring Cable Lug
$559.28
SU204MR-K50 MCB K-Char., 10kA, 50A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K40 SU204MR-K40 MCB K-Char., 10kA, 40A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K40 SU204MR-K40 MCB K-Char., 10kA, 40A, 4P, RTT UL 489, Ring Cable Lug
$512.16
SU204MR-K40 MCB K-Char., 10kA, 40A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K35 SU204MR-K35 MCB K-Char., 10kA, 35A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K35 SU204MR-K35 MCB K-Char., 10kA, 35A, 4P, RTT UL 489, Ring Cable Lug
$488.39
SU204MR-K35 MCB K-Char., 10kA, 35A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K32 SU204MR-K32 MCB K-Char., 10kA, 32A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K32 SU204MR-K32 MCB K-Char., 10kA, 32A, 4P, RTT UL 489, Ring Cable Lug
$488.39
SU204MR-K32 MCB K-Char., 10kA, 32A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K30 SU204MR-K30 MCB K-Char., 10kA, 30A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K30 SU204MR-K30 MCB K-Char., 10kA, 30A, 4P, RTT UL 489, Ring Cable Lug
$488.39
SU204MR-K30 MCB K-Char., 10kA, 30A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K25 SU204MR-K25 MCB K-Char., 10kA, 25A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K25 SU204MR-K25 MCB K-Char., 10kA, 25A, 4P, RTT UL 489, Ring Cable Lug
$488.39
SU204MR-K25 MCB K-Char., 10kA, 25A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K20 SU204MR-K20 MCB K-Char., 10kA, 20A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K20 SU204MR-K20 MCB K-Char., 10kA, 20A, 4P, RTT UL 489, Ring Cable Lug
$488.39
SU204MR-K20 MCB K-Char., 10kA, 20A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K16 SU204MR-K16 MCB K-Char., 10kA, 16A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K16 SU204MR-K16 MCB K-Char., 10kA, 16A, 4P, RTT UL 489, Ring Cable Lug
$488.39
SU204MR-K16 MCB K-Char., 10kA, 16A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K15 SU204MR-K15 MCB K-Char., 10kA, 15A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K15 SU204MR-K15 MCB K-Char., 10kA, 15A, 4P, RTT UL 489, Ring Cable Lug
$488.39
SU204MR-K15 MCB K-Char., 10kA, 15A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K13 SU204MR-K13 MCB K-Char., 10kA, 13A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K13 SU204MR-K13 MCB K-Char., 10kA, 13A, 4P, RTT UL 489, Ring Cable Lug
$488.39
SU204MR-K13 MCB K-Char., 10kA, 13A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K10 SU204MR-K10 MCB K-Char., 10kA, 10A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K10 SU204MR-K10 MCB K-Char., 10kA, 10A, 4P, RTT UL 489, Ring Cable Lug
$488.39
SU204MR-K10 MCB K-Char., 10kA, 10A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K8 SU204MR-K8 MCB K-Char., 10kA, 8A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K8 SU204MR-K8 MCB K-Char., 10kA, 8A, 4P, RTT UL 489, Ring Cable Lug
$488.39
SU204MR-K8 MCB K-Char., 10kA, 8A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K6 SU204MR-K6 MCB K-Char., 10kA, 6A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K6 SU204MR-K6 MCB K-Char., 10kA, 6A, 4P, RTT UL 489, Ring Cable Lug
$488.39
SU204MR-K6 MCB K-Char., 10kA, 6A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K5 SU204MR-K5 MCB K-Char., 10kA, 5A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K5 SU204MR-K5 MCB K-Char., 10kA, 5A, 4P, RTT UL 489, Ring Cable Lug
$488.39
SU204MR-K5 MCB K-Char., 10kA, 5A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K4 SU204MR-K4 MCB K-Char., 10kA, 4A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K4 SU204MR-K4 MCB K-Char., 10kA, 4A, 4P, RTT UL 489, Ring Cable Lug
$488.39
SU204MR-K4 MCB K-Char., 10kA, 4A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K3 SU204MR-K3 MCB K-Char., 10kA, 3A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K3 SU204MR-K3 MCB K-Char., 10kA, 3A, 4P, RTT UL 489, Ring Cable Lug
$488.39
SU204MR-K3 MCB K-Char., 10kA, 3A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K2 SU204MR-K2 MCB K-Char., 10kA, 2A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K2 SU204MR-K2 MCB K-Char., 10kA, 2A, 4P, RTT UL 489, Ring Cable Lug
$488.39
SU204MR-K2 MCB K-Char., 10kA, 2A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K1.6 SU204MR-K1,6 MCB K-Char., 10kA, 1,6A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K1.6 SU204MR-K1,6 MCB K-Char., 10kA, 1,6A, 4P, RTT UL 489, Ring Cable Lug
$488.39
SU204MR-K1,6 MCB K-Char., 10kA, 1,6A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K1 SU204MR-K1 MCB K-Char., 10kA, 1A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K1 SU204MR-K1 MCB K-Char., 10kA, 1A, 4P, RTT UL 489, Ring Cable Lug
$488.39
SU204MR-K1 MCB K-Char., 10kA, 1A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K0.75 SU204MR-K0.75 MCB K-Char., 10kA, 0.75A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K0.75 SU204MR-K0.75 MCB K-Char., 10kA, 0.75A, 4P, RTT UL 489, Ring Cable Lug
$488.39
SU204MR-K0.75 MCB K-Char., 10kA, 0.75A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K0.5 SU204MR-K0.5 MCB K-Char., 10kA, 0.5A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K0.5 SU204MR-K0.5 MCB K-Char., 10kA, 0.5A, 4P, RTT UL 489, Ring Cable Lug
$488.39
SU204MR-K0.5 MCB K-Char., 10kA, 0.5A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K0.3 SU204MR-K0.3 MCB K-Char., 10kA, 0.3A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K0.3 SU204MR-K0.3 MCB K-Char., 10kA, 0.3A, 4P, RTT UL 489, Ring Cable Lug
$488.39
SU204MR-K0.3 MCB K-Char., 10kA, 0.3A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K0.2 SU204MR-K0.2 MCB K-Char., 10kA, 0.2A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204MR-K0.2 SU204MR-K0.2 MCB K-Char., 10kA, 0.2A, 4P, RTT UL 489, Ring Cable Lug
$488.39
SU204MR-K0.2 MCB K-Char., 10kA, 0.2A, 4P, RTT UL 489, Ring Cable Lug
ABB SU204M-C0.5 SU204M-C0,5 Miniature Circuit Breaker C-Char., 10kA, 0,5A, 4P UL489
ABB SU204M-C0.5 SU204M-C0,5 Miniature Circuit Breaker C-Char., 10kA, 0,5A, 4P UL489
$488.39
SU204M-C0,5 Miniature Circuit Breaker C-Char., 10kA, 0,5A, 4P UL489
ABB SU204M-C1.6 SU204M-C1,6 Miniature Circuit Breaker C-Char., 10kA, 1,6A, 4P UL489
ABB SU204M-C1.6 SU204M-C1,6 Miniature Circuit Breaker C-Char., 10kA, 1,6A, 4P UL489
$488.39
SU204M-C1,6 Miniature Circuit Breaker C-Char., 10kA, 1,6A, 4P UL489
ABB SU204M-C63 SU204M-C63 Miniature Circuit Breaker C-Char., 10kA, 63A, 4P UL489
ABB SU204M-C63 SU204M-C63 Miniature Circuit Breaker C-Char., 10kA, 63A, 4P UL489
$652.14
SU204M-C63 Miniature Circuit Breaker C-Char., 10kA, 63A, 4P UL489
ABB SU204M-Z63 SU204M-Z63 Miniature Circuit Breaker Z-Char., 10kA, 63A, 4P UL489
ABB SU204M-Z63 SU204M-Z63 Miniature Circuit Breaker Z-Char., 10kA, 63A, 4P UL489
$652.14
SU204M-Z63 Miniature Circuit Breaker Z-Char., 10kA, 63A, 4P UL489
ABB SU204M-K63 SU204M-K63 Miniature Circuit Breaker K-Char., 10kA, 63A, 4P UL489
ABB SU204M-K63 SU204M-K63 Miniature Circuit Breaker K-Char., 10kA, 63A, 4P UL489
$652.14
SU204M-K63 Miniature Circuit Breaker K-Char., 10kA, 63A, 4P UL489
ABB SU204M-C60 SU204M-C60 Miniature Circuit Breaker C-Char., 10kA, 60A, 4P UL489
ABB SU204M-C60 SU204M-C60 Miniature Circuit Breaker C-Char., 10kA, 60A, 4P UL489
$606.05
SU204M-C60 Miniature Circuit Breaker C-Char., 10kA, 60A, 4P UL489
ABB SU204M-Z60 SU204M-Z60 Miniature Circuit Breaker Z-Char., 10kA, 60A, 4P UL489
ABB SU204M-Z60 SU204M-Z60 Miniature Circuit Breaker Z-Char., 10kA, 60A, 4P UL489
$606.05
SU204M-Z60 Miniature Circuit Breaker Z-Char., 10kA, 60A, 4P UL489
ABB SU204M-K60 SU204M-K60 Miniature Circuit Breaker K-Char., 10kA, 60A, 4P UL489
ABB SU204M-K60 SU204M-K60 Miniature Circuit Breaker K-Char., 10kA, 60A, 4P UL489
$606.05
SU204M-K60 Miniature Circuit Breaker K-Char., 10kA, 60A, 4P UL489
ABB SU204M-Z50 SU204M-Z50 Miniature Circuit Breaker Z-Char., 10kA, 50A, 4P UL489
ABB SU204M-Z50 SU204M-Z50 Miniature Circuit Breaker Z-Char., 10kA, 50A, 4P UL489
$559.28
SU204M-Z50 Miniature Circuit Breaker Z-Char., 10kA, 50A, 4P UL489
ABB SU204M-K50 SU204M-K50 Miniature Circuit Breaker K-Char., 10kA, 50A, 4P UL489
ABB SU204M-K50 SU204M-K50 Miniature Circuit Breaker K-Char., 10kA, 50A, 4P UL489
$559.28
SU204M-K50 Miniature Circuit Breaker K-Char., 10kA, 50A, 4P UL489
ABB SU204M-Z40 SU204M-Z40 Miniature Circuit Breaker Z-Char., 10kA, 40A, 4P UL489
ABB SU204M-Z40 SU204M-Z40 Miniature Circuit Breaker Z-Char., 10kA, 40A, 4P UL489
$512.16
SU204M-Z40 Miniature Circuit Breaker Z-Char., 10kA, 40A, 4P UL489
ABB SU204M-K40 SU204M-K40 Miniature Circuit Breaker K-Char., 10kA, 40A, 4P UL489
ABB SU204M-K40 SU204M-K40 Miniature Circuit Breaker K-Char., 10kA, 40A, 4P UL489
$512.16
SU204M-K40 Miniature Circuit Breaker K-Char., 10kA, 40A, 4P UL489
ABB SU204M-Z35 SU204M-Z35 Miniature Circuit Breaker Z-Char., 10kA, 35A, 4P UL489
ABB SU204M-Z35 SU204M-Z35 Miniature Circuit Breaker Z-Char., 10kA, 35A, 4P UL489
$488.39
SU204M-Z35 Miniature Circuit Breaker Z-Char., 10kA, 35A, 4P UL489
ABB SU204M-K35 SU204M-K35 Miniature Circuit Breaker K-Char., 10kA, 35A, 4P UL489
ABB SU204M-K35 SU204M-K35 Miniature Circuit Breaker K-Char., 10kA, 35A, 4P UL489
$488.39
SU204M-K35 Miniature Circuit Breaker K-Char., 10kA, 35A, 4P UL489
ABB SU204M-Z32 SU204M-Z32 Miniature Circuit Breaker Z-Char., 10kA, 32A, 4P UL489
ABB SU204M-Z32 SU204M-Z32 Miniature Circuit Breaker Z-Char., 10kA, 32A, 4P UL489
$488.39
SU204M-Z32 Miniature Circuit Breaker Z-Char., 10kA, 32A, 4P UL489
ABB SU204M-K32 SU204M-K32 Miniature Circuit Breaker K-Char., 10kA, 32A, 4P UL489
ABB SU204M-K32 SU204M-K32 Miniature Circuit Breaker K-Char., 10kA, 32A, 4P UL489
$488.39
SU204M-K32 Miniature Circuit Breaker K-Char., 10kA, 32A, 4P UL489
ABB SU204M-Z30 SU204M-Z30 Miniature Circuit Breaker Z-Char., 10kA, 30A, 4P UL489
ABB SU204M-Z30 SU204M-Z30 Miniature Circuit Breaker Z-Char., 10kA, 30A, 4P UL489
$488.39
SU204M-Z30 Miniature Circuit Breaker Z-Char., 10kA, 30A, 4P UL489
ABB SU204M-K30 SU204M-K30 Miniature Circuit Breaker K-Char., 10kA, 30A, 4P UL489
ABB SU204M-K30 SU204M-K30 Miniature Circuit Breaker K-Char., 10kA, 30A, 4P UL489
$488.39
SU204M-K30 Miniature Circuit Breaker K-Char., 10kA, 30A, 4P UL489
ABB SU204M-Z25 SU204M-Z25 Miniature Circuit Breaker Z-Char., 10kA, 25A, 4P UL489
ABB SU204M-Z25 SU204M-Z25 Miniature Circuit Breaker Z-Char., 10kA, 25A, 4P UL489
$488.39
SU204M-Z25 Miniature Circuit Breaker Z-Char., 10kA, 25A, 4P UL489
ABB SU204M-K25 SU204M-K25 Miniature Circuit Breaker K-Char., 10kA, 25A, 4P UL489
ABB SU204M-K25 SU204M-K25 Miniature Circuit Breaker K-Char., 10kA, 25A, 4P UL489
$488.39
SU204M-K25 Miniature Circuit Breaker K-Char., 10kA, 25A, 4P UL489
ABB SU204M-C50 SU204M-C50 Miniature Circuit Breaker C-Char., 10kA, 50A, 4P UL489
ABB SU204M-C50 SU204M-C50 Miniature Circuit Breaker C-Char., 10kA, 50A, 4P UL489
$559.28
SU204M-C50 Miniature Circuit Breaker C-Char., 10kA, 50A, 4P UL489
ABB SU204M-Z20 SU204M-Z20 Miniature Circuit Breaker Z-Char., 10kA, 20A, 4P UL489
ABB SU204M-Z20 SU204M-Z20 Miniature Circuit Breaker Z-Char., 10kA, 20A, 4P UL489
$488.39
SU204M-Z20 Miniature Circuit Breaker Z-Char., 10kA, 20A, 4P UL489
ABB SU204M-K20 SU204M-K20 Miniature Circuit Breaker K-Char., 10kA, 20A, 4P UL489
ABB SU204M-K20 SU204M-K20 Miniature Circuit Breaker K-Char., 10kA, 20A, 4P UL489
$488.39
SU204M-K20 Miniature Circuit Breaker K-Char., 10kA, 20A, 4P UL489

MCBs have two tripping mechanisms – the delayed thermal tripping mechanism for overload protection and the magnetic tripping mechanism for short circuit protection. Miniature circuit breakers have current ratings below 100 Amperes, classified by the current range at which they trip instantly. These are some of the standard breaker overcurrent protection ratings:

  • Type A – Trips at under 2 times the rated current
  • Type Z – Trips at 2.4 to 3.6 times the rated current
  • Type B – Trips at 3 to 5 times the rated current, suitable for resistive or slightly inductive loads.
  • Type C – Trips at 5 to 10 times the rated current, suitable for moderate inductive loads.
  • Type D – Trips at 10 to 20 times the rated current, suitable for loads with a high inductive component.

Click here to learn more about what a circuit breaker is.

Click here for more information about the difference between supplementary and branch breakers.

Click here for an explanation of the differences between circuit breakers and fuses. 

FAQ

What is the difference between a fuse and a miniature circuit breaker?

Miniature circuit breakers are resettable circuit protection that trips when a circuit tries to draw too much current. After tripping, the breaker can be reset and used again. A fuse is a one-time use form of circuit protection that blows when too much current is drawn.

What are the advantages of miniature circuit breaker?

Miniature circuit breakers are more sensitive and trip faster than typical fuses. They are also easier to diagnose issues and resume operation than fuses.

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