Mini Circuit Breakers

Miniature circuit breakers (MCBs) are found in single, double, and four-pole configurations. They can be used to protect both single-phase and three-phase systems. The different types have been developed to suit specific areas of use. 'B'-type MCBs tend to be used in domestic installations. They trip at lower currents and are suitable for the touchy business of inrush current. 'C' and 'D' MCBs tend to be used in commercial and industrial installations. They can handle higher inrush currents operating in those contexts.

There are various reasons why MCBs are better than fuses. MCBs can be reset after they trip, so they do not have to be replaced like fuses do. When a fuse burns out, that's it—there is no more protection. But when an MCB trips, it can be reset, and you are right back in business. You should also be aware that the circuit level of MCBs can often be adjusted.

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Phoenix Contact 0916605 Thermal-magnetic device circuit breaker UT 6-TMC M 2A
Free U.S Ground shipping
$25.12
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Phoenix Contact 2907571 Miniature Circuit Breaker TMC 81C 15A
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Phoenix Contact 0916607 Thermal-magnetic device circuit breaker UT 6-TMC M 5A
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$25.12
$20.93
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Phoenix Contact 0916610 Thermal-magnetic device circuit breaker UT 6-TMC M 10A
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$20.93
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Phoenix Contact 2907573 Miniature Circuit Breaker TMC 81C 20A
Free U.S Ground shipping
$29.99
$24.99
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Phoenix Contact 0916606 Thermal-magnetic device circuit breaker UT 6-TMC M 4A
Free U.S Ground shipping
$25.12
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Phoenix Contact 2800837 Thermal-magnetic device circuit breaker CB TM1 2A SFB P
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Phoenix Contact 2907566 Miniature Circuit Breaker TMC 81C 10A
Free U.S Ground shipping
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Phoenix Contact 2907562 Miniature Circuit Breaker TMC 81C 05A
Free U.S Ground shipping
$29.99
$24.99
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Phoenix Contact 2800854 Thermal-magnetic device circuit breaker CB TM1 10A M1 P
Free U.S Ground shipping
$64.80
$54.00
Normally In Stock
Phoenix Contact 0916609 Thermal-magnetic device circuit breaker UT 6-TMC M 8A
Free U.S Ground shipping
$25.12
$20.93
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Phoenix Contact 2907559 Miniature Circuit Breaker TMC 81C 02A
Free U.S Ground shipping
$29.99
$24.99
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Phoenix Contact 2907490 Miniature Circuit Breaker TMC 81B 15A
Free U.S Ground shipping
$29.99
$24.99
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Phoenix Contact 2800848 Thermal-magnetic device circuit breaker CB TM1 2A M1 P
Free U.S Ground shipping
$64.80
$54.00
Normally In Stock
Phoenix Contact 2800851 Thermal-magnetic device circuit breaker CB TM1 5A M1 P
Free U.S Ground shipping
$64.80
$54.00
Normally In Stock
Eaton CH260 Thermal Magnetic Circuit Breaker - 240 Max Volt 60 Amp
Free U.S Ground shipping
$58.28
$48.57
Normally In Stock
Phoenix Contact 0916604 Thermal-magnetic device circuit breaker UT 6-TMC M 1A
Free U.S Ground shipping
$25.12
$20.93
Normally In Stock
Phoenix Contact 0916611 Thermal-magnetic device circuit breaker UT 6-TMC M 12A
Free U.S Ground shipping
$25.12
$20.93
Normally In Stock
Phoenix Contact 0916603 Thermal-magnetic device circuit breaker UT 6-TMC M 0,5A
Free U.S Ground shipping
$25.12
$20.93
Normally In Stock
Phoenix Contact 2800839 Thermal-magnetic device circuit breaker CB TM1 4A SFB P
Free U.S Ground shipping
$64.80
$54.00
Normally In Stock
Phoenix Contact 2800840 Thermal-magnetic device circuit breaker CB TM1 5A SFB P
Free U.S Ground shipping
$64.80
$54.00
Normally In Stock
Phoenix Contact 2800859 Thermal-magnetic device circuit breaker CB TM1 2A F1 P
Free U.S Ground shipping
$64.80
$54.00
Normally In Stock
Phoenix Contact 2800862 Thermal-magnetic device circuit breaker CB TM1 5A F1 P
Free U.S Ground shipping
$64.80
$54.00
Normally In Stock
Phoenix Contact 2907492 Miniature Circuit Breaker TMC 81B 20A
Free U.S Ground shipping
$29.99
$24.99
Normally In Stock
Phoenix Contact 2907574 Miniature Circuit Breaker TMC 81C 25A
Free U.S Ground shipping
$29.99
$24.99
Normally In Stock
Phoenix Contact 2907591 Miniature Circuit Breaker TMC 82C 10A
Free U.S Ground shipping
$59.95
$49.96
Normally In Stock
Phoenix Contact 2907560 Miniature Circuit Breaker TMC 81C 03A
Free U.S Ground shipping
$29.99
$24.99
Normally In Stock
Phoenix Contact 2907565 Miniature Circuit Breaker TMC 81C 08A
Free U.S Ground shipping
$29.99
$24.99
Normally In Stock
Phoenix Contact 2907575 Miniature Circuit Breaker TMC 81C 30A
Free U.S Ground shipping
$29.99
$24.99

FAQs

Do miniature circuit breakers provide branch circuit protection, short circuit protection and prevent damage to control circuits?

Yes, miniature circuit breakers provide branch circuit protection, short circuit protection, and prevent damage to control circuits by automatically interrupting the electrical flow when an overcurrent or short circuit condition is detected​.

Can DIN rail mounted mini circuit breakers be built with superior shock and vibration resistance while protecting devices in most applications?

Yes, DIN rail mounted miniature circuit breakers can be built with superior shock and vibration resistance while protecting devices in most applications, ensuring reliable operation even in harsh industrial environments​.

What do the c curve and d curve mean in the complete range of circuit protection equipment?

The C curve and D curve in circuit protection equipment refer to the tripping characteristics of circuit breakers, with C curve breakers designed for general applications and moderate inrush currents, while D curve breakers handle high inrush currents, such as those from transformers or motors.

Trip Curve Basics Part 1

There are two critical elements in miniature circuit beakers.

Bimetal strip

This strip has two dissimilar metals attached to one another. When a prolonged overcurrent occurs, these metals begin to bend. Because the metals are different, the rate at which they bend is different, therefore causing the strip to bend. If this bending occurs long enough, the bending strip will disrupt the electrical contacts inside the breaker, causing it to trip.

Coil or solenoid

The coil or solenoid is designed for larger overcurrent events like a short circuit or lightning strike. When a large overcurrent event occurs, the plunger in the solenoid is actuated, thereby tripping the breaker.

What are trip curves?

It is both the prolonged overcurrent protection from the bimetal strip and the higher spikes in voltage and current protection from the solenoid that make up the circuit breakers trip curve. How fast or slow these events occur determines the shape of the curve. A trip curve is simply a graphical representation of the expected behavior of a circuit protection device, in this case, a circuit breaker.

This graphical representation looks at two separate pieces of data to provide the information needed to understand when a particular breaker will trip. The first is time, more specifically, the time the circuit breaker experiences a certain amount of overcurrent. The second is the amount of current. In this case, how much more current is passing through the breaker than the protection device is actually rated for.