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Miniature Circuit Breakers (MCBs)
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FAZ-C1/1-SP
Eaton FAZ supplementary protector,UL 1077 Industrial miniature circuit breaker-supplementary protector,Single package,Medium levels of inrush current are expected,1 A,15 kAIC,Single-pole,277 V,5-10X/n,Q38,50-60 Hz,Standard terminals,C Curve
Eaton
STOCK: 48
Fast shippingB280
Siemens B280 Miniature Circuit Breakers (MCBs)
Siemens
STOCK: 47
Fast shippingFAZ-C20/1-SP
Eaton FAZ supplementary protector,UL 1077 Industrial miniature circuit breaker-supplementary protector,Single package,Medium levels of inrush current are expected,20A,15 kAIC,Single-pole,277 V,5-10X/n,Q38,50-60 Hz,Standard terminals,C Curve
Eaton
STOCK: 46
Fast shippingQY-1-13-DM-U2-02
Circuit Breaker, 1 Pole, 2 Amp, 80 VDC, UL489
CBI Electric
STOCK: 46
Fast shippingFAZ-D40/1-NA-SP
Eaton FAZ branch protector,UL 489 Industrial miniature circuit breaker - supplementary protector,Single package,High levels of inrush current are expected,40 A,10 kAIC,Single-pole,277 V,10-20X /n,Q38,50-60 Hz,Screw terminals,D Curve
Eaton
STOCK: 45
Fast shippingFAZ-B10/1-NA-L
Miniature circuir breaker, 1 pole, 10 A, B trip curve, 240 VAC, screw terminals, UL489
Eaton
STOCK: 44
Fast shippingBQ3B050
Siemens BQ3B050 Miniature Circuit Breakers (MCBs) EA
Siemens
STOCK: 43
Fast shippingB270
Siemens B270 Miniature Circuit Breakers (MCBs) 2P 70A
Siemens
STOCK: 42
Fast shippingQY-1-13-DM-U2-0.5
Circuit Breaker, 1 Pole, 0.5 Amp, 80 VDC, UL489
CBI Electric
STOCK: 42
Fast shippingQ315
Siemens Q315 Miniature Circuit Breakers (MCBs) 3P 15A
Siemens
STOCK: 41
Fast shippingQ120H
Siemens Q120H Miniature Circuit Breakers (MCBs) 120V
Siemens
STOCK: 40
Fast shippingBQ1B015
Siemens BQ1B015 Miniature Circuit Breakers (MCBs)
Siemens
STOCK: 40
Fast shippingSU202MR-K8
ABB Control - SU202MR-K8
ABB Control
STOCK: 40
Fast shippingBQD350
Siemens BQD350 Miniature Circuit Breakers (MCBs)
Siemens
STOCK: 40
Fast shippingFAZ-C5/2-RT
277/480 VAC 50/60 Hz, 5 A, 2-Pole, 10/14 kA, 5 to 10 x Rated Current, Ring Tongue Terminal, DIN Rail Mount, Standard Packaging, C-Curve, Current Limiting, Thermal Magnetic
Eaton
STOCK: 40
Fast shippingBQD150
Siemens BQD150 Miniature Circuit Breakers (MCBs) 1P 50A 277V
Siemens
STOCK: 40
Fast shippingFAZ-D16/2-RT
Miniature circuit breaker, 2 pole, 16 A, D trip curve, 277/480 VAC, ring-tongue terminals, UL489
Eaton
STOCK: 40
Fast shippingBQ3B070
Siemens BQ3B070 Miniature Circuit Breakers (MCBs)
Siemens
STOCK: 40
Fast shippingFAZ-C6/2-NA-DC
Eaton FAZ branch protector,UL 489 Industrial miniature circuit breaker - supplementary protector,Medium levels of inrush current are expected,6 A,10 kAIC,Two-pole,125 Vdc per pole,5-10X /n,50-60 Hz,Screw terminals,C Curve
Eaton
STOCK: 39
Fast shippingFAZ-C30/3-NA
277/480 VAC 50/60 Hz, 30 A, 3-Pole, 10/14 kA, 5 to 10 x Rated Current, Screw Terminal, DIN Rail Mount, Standard Packaging, C-Curve, Current Limiting, Thermal Magnetic
Eaton
STOCK: 39
Fast shipping
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Miniature Circuit Breakers (MCBs)
General Guide & Overview
Welcome to our comprehensive guide on miniature circuit breakers (MCBs). Whether you're an electrical professional or simply interested in understanding the inner workings of your home's electrical system, this article will provide you with all the information you need about MCBs.
MCBs are vital components of electrical systems, offering crucial protection against overloads and short circuits. Unlike traditional fuses, MCBs are automatic switches that respond to changes in current flow. This innovative technology not only enhances safety but also improves convenience for users.
In this guide, we will explore how MCBs work, the different types available, and the advantages they offer. So let's dive in and unlock the mysteries behind these essential electrical devices.
How Does a Miniature Circuit Breaker Work?
A miniature circuit breaker (MCB) is a vital component of an electrical system, designed to protect against overloads and short circuits. Understanding how an MCB works can help you ensure the safety and efficiency of your electrical installations.
MCBs operate by utilizing two types of tripping mechanisms: thermal tripping and magnetic tripping.
Thermal Tripping
Thermal tripping is the primary mechanism in MCBs. It detects and responds to excessive heat caused by an overload in the circuit. Inside the MCB, there is a bimetallic strip made of two different metals with different expansion coefficients. When the current passing through the MCB exceeds its rated capacity, the bimetallic strip heats up, causing the metals to expand at different rates. As a result, the strip bends and activates the trip mechanism, opening the contacts to interrupt the current flow.
Magnetic Tripping
Magnetic tripping is a secondary mechanism in MCBs. It provides rapid protection against short circuits by detecting strong current surges. Inside the MCB, there is an electromagnetic coil surrounding the current-carrying contacts. When a short circuit occurs, an extremely high current flows through the coil, generating a magnetic field that attracts the armature. The armature then trips the mechanism, opening the contacts and isolating the faulty circuit from the power supply.
The integration of both thermal and magnetic tripping mechanisms allows MCBs to provide reliable protection against a wide range of electrical faults. By quickly detecting and responding to abnormal current conditions, MCBs help prevent damage to electrical equipment, reduce the risk of electrical fires, and ensure the uninterrupted supply of electricity.
Advantages and Application of Miniature Circuit Breakers (MCBs)
Miniature circuit breakers (MCBs) provide a host of advantages compared to traditional fuses. One key advantage is their high responsiveness to changes in current flow, enabling swift and effective protection against overloads and short circuits. With MCBs, you can ensure that your electrical system remains safe and reliable.
MCBs are designed with a trip-free switching mechanism that instantly cuts off power in the event of an overload. This feature enhances the safety of your electrical circuits, preventing any potential damage or hazards. Additionally, MCBs are incredibly user-friendly, offering ease of installation and operation.
Another advantage of MCBs is the wide variety of models available, catering to different application requirements. Whether you need a specific current rating, breaking capacity, or fault protection characteristics, there is an MCB type that suits your needs. This flexibility allows for customization and ensures optimal performance, making MCBs a versatile choice for various electrical systems and applications.
FAQ
What is a miniature circuit breaker (MCB)?
A miniature circuit breaker (MCB) is an important component of an electrical system that provides protection against overloads and short circuits. Unlike traditional fuses, MCBs are automatic switches that open and close in response to changes in current flow, offering improved safety and convenience.
How does a miniature circuit breaker (MCB) work?
A miniature circuit breaker (MCB) works by using two types of tripping mechanisms: thermal tripping and magnetic tripping. Thermal tripping responds to excessive heat caused by an overload, while magnetic tripping responds to sudden increases in current flow caused by a short circuit.
What are the advantages of using miniature circuit breakers (MCBs)?
Miniature circuit breakers (MCBs) offer several advantages over traditional fuses. They are highly responsive to changes in current flow and provide reliable protection against overloads and short circuits. MCBs are easy to use, with a trip-free switching mechanism that instantly shuts off power in the event of an overload. They also have a wide range of models available, allowing for customization based on specific application requirements.