China Customized Mini Circuit Breaker Manufacturers Suppliers Factory

KINO ELECTRICS CO. LTD：Your Professional Mini Circuit Breaker Manufacturer !

KINO was established in 2005 and is a professional manufacturer of low voltage electrical device. We are specialized in manufacturing the mini circuit breakers, molded case circuit breakers, ac contactors, over load relays, photovoltaic series breakers and other related electrical baskets of products. Our mission is to be a professional manufacturer for worldwide customers with high quality and best service.

Rich Products

Our company can produce mini circuit breakers, isolating switches, leakage circuit breakers, single-phase leakage circuit breakers, three-phase leakage circuit breakers, lightning arresters, molded case circuit breakers, distribution boxes, etc.

Advanced Equipment

We have 1600M² of work space and 5 production lines, as well as various assembly, calibration, packaging and other equipment.

Versatile Products

Our mini circuit breaker is an overcurrent protection device used in residential, commercial and industrial electrical systems; and the isolating switch is an important switching device in the power system. The isolating switch can be used in conjunction with other control equipment to realize the control of the power system.

Leading Service

We have many years of industry experience and a complete production management, quality supervision, sales service operation system. Whether you want to buy a mini circuit breaker or a molded case circuit breaker, just send your requirements via email and we can customize the product for you.

Mini Circuit Breaker NB1 63 C65
Unit Price. 1P is $0.90~$1.30/Unit. 2P is $1.80~$2.60/Unit. 3P is $2.70~$3.90/Unit. 4P is $3.60~$5.20/Unit
DC Miniature Circuit Breaker
Unit Price. 1P is $1.50~$2.00/Unit. 2P is $3.00~$4.00/Unit. 3P is $4.50~$6.00/Unit. 4P is $6.00~$8.00/Unit
Samite Circuit Breaker
Unit Price. 1P: $1.00-$1.35. 2P: $2.00-$2.70. 3P: $3.00-$4.05. 4P: $4.00-$5.40
Mini Circuit Breaker DZ47 63 C45
Unit price: . 1P is $2.00~$5.00/Pcs. 2P is $5.00~$10.00/Pcs. 3P is $8.00~$15.00/Pcs
Mini Circuit Breaker DZ158 125 NC
Unit Price. 1P is $1.70~$1.90/Unit. 2P is $3.40~$3.80/Unit. 3P is $5.10~$5.70/Unit. 4P is $6.80~$7.60/Unit
Mini Circuit Breaker DPN
Unit Price. 1P+N is $0.9~$1.1/Unit

What is Mini Circuit Breaker？

Mini circuit breakers (MCBs) are devices that protect electrical circuits from overcurrent, short circuit, and overload conditions. They are designed to automatically interrupt the flow of current when it exceeds a predetermined value, preventing damage to the circuit and the connected equipment. MCBs are widely used in residential, commercial, and industrial applications, as they offer a reliable and convenient way to isolate and reset circuits without replacing fuses or wires.

Types of Mini Circuit Breaker

Mini circuit breakers (MCBs) are installed in spaces depending on the need of the appliance. Hence, you will find multiple MCB types that can be used for a range of purposes. The most popular MCB types are A, B, C, D, K and Z. Of these, the most commonly used are B, C and D. These categories are often based on their trip curve or tripping capacities.

Type B

These are often used in residential properties or industrial units with small scale of operations. In such MCBs, the trip occurs when the power exceeds 5 times more than the suggested limit. These MCBs are considered to be the most sensitive owing to their lower tolerance for voltage shifts. Since, current surges and fluctuations are less intense in residential spaces, it’s mostly used in such areas.

Type C

These MCBs often trip at surges that exceed 10 times the power capacity. So these are strategically used in devices which have high power consumption requirements. Often you will find Type C MCBs in commercial and industrial units. Electrical motors and fluorescent lighting are electrical accessories where Type C MCBs are used. They offer higher protection in comparison to type B MCBs and have a higher capacity to handle surges.

Type D

Considered to be the least sensitive MCB type, the Type D has a surge capacity of 10 to 20 times higher than the power threshold. Often these are used in devices such as X-ray machines, motors and other equipment that has higher rush of power. Such expensive appliances often need added protection from fluctuations in voltage and power surges and hence these need a high capacity and robust MCB.

Features of Mini Circuit Breaker

A mini circuit breaker (MCB) is an Electrical Switch that automatically switches off the electrical circuit during an abnormal condition of the network means an overload condition as well as a faulty condition. Here are several features of MCBs.

Compact Size
Installing mini circuit breakers in confined spaces is easy, given their small size. They are also lightweight, making them ideal for applications where weight is a concern. Their modular design allows for easy replacement of individual units without affecting the rest of the system.

Fast Action
MCBs are designed to trip quickly and interrupt the current flow within a few milliseconds when a fault is detected, thus protecting the circuit and connected appliances from damage.

High Sensitivity
MCBs can detect even minor overloads and short circuits, making them an effetive protection device for electrical systems.

Working Principle of Mini Circuit Breaker

A mini circuit breaker, also known as a circuit switch breaker or MCB is an automatic electric switch designed to prevent electrical current from flowing when the input voltage exceeds the maximum allowable value. The trip unit is the essential part responsible for the proper functioning of the MCB. In a hybrid MCB, there are two trip mechanisms: a bi-metal that protects against overload current and an electromagnet that protects against electric short circuit current. There are also other MCB types that include only either one of these tripping mechanisms.

01.

Thermal Element

The thermal element of an MCB is a bimetallic strip that heats up when current flows through it. As the current increases, the bimetallic strip bends due to the heat and eventually trips the MCB when it reaches a certain temperature. The thermal mechanism in a hybrid MCB is calibrated to trip at a specific temperature. The set temperature is typically determined based on the expected load and operating conditions of the circuit.

02.

Magnetic Element

The magnetic element of an MCB is a solenoid coil that creates a magnetic field when current flows through it. The magnetic mechanism is calibrated to trip at a specific current level. The magnetic field pulls on a spring-loaded trip lever that releases the switch, tripping the MCB. This mechanism protects against short circuits, which occur when the current flows through a low-resistance path, such as a damaged wire.

Benefits of Mini Circuit Breaker

An MCB is a safety device that breaks the circuit when a fault occurs, preventing the flow of excess or high current from damaging electrical appliances. Its design is also more convenient than a fuse, as the faulty device can be reset and the supply resumed immediately.

Simple and Easy to Use
Mini circuit breaker is more sophisticated than a fuse, which must be replaced whenever it trips or overheats. It works on a new, more efficient mechanism that eliminates the need for fuses. The thermal tripping effect, which works with a bimetallic strip, causes the trip lever to be displaced, causing the trip coil to strike the trip lever. This action opens the contacts in the MCB.

Reliable and Convenient
The MCB is designed to operate at a rated frequency. Its rated current and ultimate breaking capacity are defined by trip curves. The rated and tripped currents of an MCB are controlled by ambient temperature, which affects the time it takes for the device to trip. These are two of the main benefits of an MCB. Because of their ability to work in harsh environments, MCBs are a safe, reliable, and convenient alternative to fuses.

Improved Safety
The MCB has improved operational safety. It can handle voltage fluctuations and can be remotely switched on and off. It is also compatible with large inductive loads, such as motors and electric dryers. The MCB is a great choice for homes and businesses with high electrical usage. The MCB is more sensitive than a fuse, making it a better choice in certain applications. An MCB is a safer alternative to a fuse.

Less Replacement Cost
When compared to a fuse, MCBs can also be cheaper. In some cases, the MCB can cost less than a conventional circuit breaker. The MCB will cost more, but it is well worth the investment as you can reuse it without changing the device.

Can Be Used Anywhere
Another advantage is that it can be used anywhere, including on the floor. These breakers are more resistant to temperature changes than their counterparts and will prevent a fire from breaking out.

Overload protection
Using an MCB has many advantages over a fuse. An MCB is designed to protect electrical equipment, human life and property from a fire. It breaks the circuit when an overload occurs, while a fuse will break the circuit when a short has occurred. A fuse is reusable, but it will need to be replaced after the first failure.

Various Options
MCBs come in different types and can be used for various purposes. The most common type is the general-purpose MCB, used in lighting applications and appliances such as fans, compressors, and pumps. Other types include motor-circuit protection, overload protection, and earth leakage protection (ELC).

Universal and Compact
MCBs are available in several configurations, including single-pole, double-pole, and multi-pole versions with both low voltage (LV) and high voltage (HV) ratings. These products can be used in many applications such as heating, ventilation, air conditioning systems, etc.

Components of Mini Circuit Breaker

Mini circuit breakers have a simple construction, although, the parts that make up a mini circuit breaker work in a very precise manner. A typical mini circuit breaker is made up of four main components: the Frame, the Operating Mechanism, the Trip Unit and the Contacts.

Frame

The mini circuit breaker frame has a molded case exterior. Its primary function is to provide a rigid, mechanically strong, insulated housing in which the other components are mounted.

Operating Mechanism

The operating mechanism of a mini circuit breaker provides the means of opening and closing the circuit. It has a three-position switch ("on", "off", and "tripped"). It can only be in the "tripped" position as a result of an overcurrent. When power is removed manually, it can only be switched to the "off" position. This makes it easy for a maintenance person to determine why power has been cut.

Trip Unit

The trip unit of a mini circuit breaker acts as the brain of the device. It activates the operating mechanism in the event of a prolonged overload or short circuit. This type of circuit breaker uses a thermal magnetic mechanism. This is the predominant trip unit technology used in the domestic market. A bimetal and an electromagnet work together to provide overload and short-circuit protection.

Contacts

When an overload or short circuit situation occurs, the mini circuit breaker contacts open to break the current flow. When this happens, an electrical arc is formed. The arc continues until the first possible zero point in the AC cycle. The zero point is the weakest point in the AC cycle and will not support the continuance of an arc. By breaking the arc, current flow is stopped. This is called zero point construction.

Applications of Mini Circuit Breaker

MCBs (Mini Circuit Breakers) and traditional circuit breakers both function as protective devices that automatically interrupt the electrical current flow in a circuit when it exceeds the safe operating limit. However, MCBs have some distinctive features and are utilized in different applications compared to traditional circuit breakers. Some typical applications of MCBs include:

Residential and Commercial Buildings
MCBs are frequently used as a primary protective device in low-voltage electrical installations in homes, offices, and other buildings. They are often integrated into consumer units, distribution boards, or switchboards to provide protection against overcurrent, short-circuit, and overload conditions.

Industrial Applications
MCBs are also used in industrial settings for the electrical protection of various equipment such as motors, pumps, and other types of machinery. They are used in conjunction with other protective devices, such as contactors, relays, and fuses, to provide a comprehensive protection system.

Automotive Applications
MCBs are often used in automotive applications to protect against overcurrent and short-circuit conditions. They are typically found in vehicles' electrical distribution systems, protecting various components such as lights, wipers, and motors.

Factors to Consider When Selecting a Mini Circuit Breaker

MCB (Mini Circuit Breaker) is an electrical switching device, designed to protect wiring installation from over current faults. Its basic function is to detect a fault and interrupt continuity of supply immediately. Unlike fuse, which operates once and then has to be replaced, a circuit breaker can be reset (manually) to resume normal operation. Here are some of the things you need to consider in order to select a mini circuit breaker.

Rated Current

It is the amount of current the circuit can handle. It can withstand currents from 0.5A to 125A. So, you need to check the power supply of the circuit and accordingly choose an MCB as per the power.

Number of Poles

There are different types of MCBs available as per the number of poles, i.e. single, single pole and neutral, double, triple, and four poles. You need to consider the phase and neutral to choose an MCB.

Tripping Characteristics

It shows the tripping time required by the MCB. The tripping range differs from one MCB to another. So, you need to check the tripping class of the device. You can choose from the B curve, C curve, D and K curve, and Z curve.

Rated Operational Voltage

It is the voltage required for the MCB to function. It is the maximum value. As different MCBs have different operational voltages, you need to choose them accordingly.

Breaking Capacity

It is the current that the device can carry and break. You need to choose a low-breaking capacity MCB for household use.

Frequently Asked Questions

Q: Can an MCB protect against electric shocks?

A: While MCBs primarily protect against overcurrent and short circuits, they don’t offer direct protection against electric shocks. For shock protection, one would need a Residual Current Circuit Breaker (RCCB) or Ground Fault Circuit Interrupter (GFCI).

Q: Are there any safety precautions to consider with MCBs?

A: Always ensure the MCB is of the correct rating for your circuit. Periodically inspect for signs of wear or damage. Do not force a tripped MCB to stay on, and always consult professionals for installation or troubleshooting.

Q: What is a Mini Circuit Breaker (MCB)?

A: A Mini Circuit Breaker (MCB) is a type of electrical protection device used to automatically switch off an electrical circuit in case of an over-current, over-voltage, or short circuit.

Q: How does an MCB work?

A: An MCB works by detecting the current flowing through an electrical circuit. If the current exceeds the maximum level set for the MCB, it will automatically trip and interrupt the circuit.

Q: What is the difference between an MCB and a fuse?

A: An MCB and a fuse both provide protection for an electrical circuit, but they work differently. A fuse is a one-time-use device that melts and disconnects the circuit if the current becomes too high, while an MCB can be reset after it trips and continues to provide protection.

Q: How do I select the right MCB for my application?

A: The right MCB for a specific application depends on factors such as the current rating of the circuit, the type of load being powered, and the type of protection required. It is important to consult with a qualified electrician or engineer to determine the appropriate MCB for a specific application.

Q: What is the standard current rating for MCBs?

A: The standard current rating for MCBs varies, but common ratings include 1A, 2A, 5A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, and 63A.

Q: What is the lifespan of an MCB?

A: The lifespan of an MCB depends on several factors, including the frequency and severity of trips, environmental conditions, and the quality of the device. Generally, MCBs have a lifespan of several decades with proper maintenance and usage.

Q: Can I replace an MCB myself?

A: While it is technically possible to replace an MCB yourself, it is generally recommended that only a qualified electrician perform this task. This is because improper installation of an MCB can lead to unsafe conditions and void the manufacturer’s warranty.

Q: How can I test an MCB to see if it is working correctly?

A: Testing an MCB is typically done using a voltage tester or multimeter. The device can be tested by measuring the voltage across the breaker when it is in the “on” position, and then again when it is in the “off” position after tripping the breaker. If the voltage is present in the “off” position, the breaker may need to be replaced.

Q: What are the types of tripping mechanisms in MCBs?

A: MCBs can have thermal, magnetic, or a combination of both tripping mechanisms. Thermal tripping responds to overloads, while magnetic tripping responds to short circuits.

Q: What are the different types of MCBs based on tripping characteristics?

A: Type B: for general purposes and slightly inductive loads.
Type C: for resistive loads with moderate inrush current.
Type D: for circuits with high inrush current, such as motor circuits.

Q: Can MCB protect from fire?

A: MCB's or Mini Circuit Breakers are devices that detect and stop an unusual power surge. Usually, a surge of power can damage your appliances and even cause a short circuit to occur. MCBs help detect this possibility and mitigate the risk of a fire.

Q: Why do MCB fail?

A: Check for loose connections. Loose connections can cause an increase in resistance and heat in the circuit, which can trip the MCB. Check for any loose connections and tighten them if necessary. Replace faulty appliances: Faulty appliances can cause an increase in current flow, which can trip the MCB.

Q: Can we reuse MCB?

A: Handling MCB is electrically safer than handling a fuse. MCB is reusable and hence has less maintenance and replacement cost. Whereas a fuse needs to be replaced whenever it goes faulty.

As one of the most professional mini circuit breaker manufacturers and suppliers in China, we're featured by quality products and competitive price. Please rest assured to buy mini circuit breaker in stock here and get quotation from our factory. Also, customized service is available.

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