Why Choose Us
OUR FIELD
The company focuses on the high and low voltage electrical appliance industry
STRONG BACKING
Formalized quality management system as a strong backing
QUALITY SYSTEM
We strictly follow the national quality system standards
OUR PRODUCT
Universal circuit breaker series, plastic circuit breaker series, small circuit breaker series, AC contactor series, surge protector series, load isolation switch series, isolation knife switch series, control and protection switch series, double power automatic switch series, high voltage components
Primarily used in low-voltage circuits, especially in secondary power distribution systems such as floor main switches and power boxes. It provides short circuit and overload protection at high currents (typically above 100 amps). MCCB features include small size, ease of operation, and robust overload and short-circuit protection.
Confirm the Environment: Ensure the installation environment is dry, well-ventilated, free of corrosive gases, and avoid locations with high temperatures, humidity, or strong vibrations.
Confirm the environment: Ensure that the installation environment is dry, well-ventilated, free of corrosive gases, and avoid places with high temperature, high humidity or strong vibration.
Choose the circuit breaker's rated current based on the circuit's load current and expected maximum operating current. Typically, the rated current should slightly exceed the circuit's maximum operating current to ensure normal operation under overload conditions.
Nm1 Moulded Case Circuit Breaker
The NM1 Molded Case Circuit Breaker is suitable for AC 50Hz or 60Hz distribution network circuits with a rated working voltage up to 690V. It has a rated insulation voltage of up to 800V (500V for type 63) and a rated current range from 6A to 1250A.
Dc Molded Case Circuit Breaker
DC molded case circuit breakers utilize special arc extinguishing and current limiting systems to quickly interrupt fault currents in DC power distribution systems. This ensures circuits can be promptly disconnected under abnormal conditions, protecting equipment and systems from damage.
Molded case circuit breakers are primarily used in low-voltage power distribution systems as essential components for circuit protection and control.
The main function of the molded case circuit breaker is to automatically cut off the current. When the current exceeds the set trip value, it quickly disconnects the circuit to protect it from damage caused by abnormal conditions such as overload and short circuits.
Insulated Case Circuit Breaker
Protects circuits and equipment from overload, short circuit, and other faults.
The insulated case provides additional safety against arcing and electric shock, suitable for high voltage and high current applications.
What is Mccb Breaker
A molded case circuit breaker (MCCB) is a safety device that protects electrical circuits from short circuits and overloads by preventing excessive current flow. MCCBs can be used in a variety of applications, including residential, commercial, and industrial settings.
Arc Chute
Arc chute is a set of parallel metal plates that are mutually insulated from each other. it helps in extinguishing the arc by splitting the arc and lengthening it. it is also known as an arc divider or arc splitter. These plates are made of ferromagnetic material.
Contacts
Contacts are the metallic conductors that are responsible for carrying the current to the load. There are two types of contacts i.e. fixed and moving contact. The contacts are made of arc resistance material having low resistivity and corrosion. The quality of the material decides the lifetime of the circuit breaker.
Operating Mechanism
It is the mechanism of MCCB responsible for opening and closing the current-carrying contacts. it is connected with trip unit that triggers the operating mechanism. The trip unit operates on a thermal and magnetic mechanism.
Terminal Connector
The terminal connectors are used to connect the MCCB to the external circuit. The upper terminals are connected to the output/load while the bottom terminals are connected to the input/supply. Although they are bidirectional, the input and output designation is due to their physical installation
Trip Unit
It is the unit responsible to trigger the operating mechanism. The trip unit includes a thermal mechanism for overload, magnetic tripping for short circuits and a test button for testing.
Thermal Trip Unit
The thermal trip unit uses a thermal mechanism that is a bimetallic strip that bends (and opens the contacts) when the temperature rises due to the overloading.
Magnetic Trip Unit
The magnetic trip unit has a relay that generates a magnetic field when higher currents flow through its solenoid due to the short circuit. it trips the circuit breaker. While the test button is used to simulate the above-said mechanisms and test the response of the circuit breaker.
Handle / Trip-free Mechanism
It is a handle used to open or close the breaker manually. It is also known as a trip-free mechanism because it will trip even if the handle is held in ON position.
Trip Button
The trip button is used for testing the breaker. It is a red-colored button that trips the operating mechanism when pushed.
Types of Mccb Breaker
These MCCB trips at current 3 to 5 times its rated current with tripping time of 0.04 to 13 seconds. These are the 2nd most sensitive types of MCCB after type Z as they can tolerate very small surges. It must not be used in places having normal low surges. It will frequently trip even in normal conditions. They are used for resistive loads and other resistive elements.
Such MCCB trips at current surges 5 to 10 times its rated current with tripping time of 0.04 to 5 seconds. As they can tolerate higher surges than type B, they are used for small inductive loads such as small motors, transformers and electromagnets used in industries.
Type D MCCB trips at current 10 to 20 times its rated current with a tripping time of 0.04 to 3 seconds. They can tolerate the highest surges; therefore, they are used for highly inductive loads having very high inrush current such as large electrical motors in industries.
Type K MCCB trips at 10 to 12 times its rated current with a tripping time of 0.04 to 5 seconds. They are used for inductive loads such as motors with high inrush current.
Type Z MCCB is the most sensitive MCCB as they trip at 2 to 3 times its rated current. They are used for sensitive semiconductor-based medical or other expensive equipment that is vulnerable to low current surges.
Frame
The frame of an Mccb Breaker is the outer casing that houses all the internal components. The frame is typically made of molded plastic or metal and provides mechanical strength and protection against environmental factors such as dust and moisture.
Operating mechanism
The operating mechanism of an Mccb Breaker is responsible for opening and closing the circuit breaker. It typically consists of a handle or lever that is used to manually operate the device, as well as a mechanism for tripping the breaker automatically in the event of an overload or short circuit.
Trip unit
The trip unit is the heart of an Mccb Breaker, responsible for detecting and interrupting current flow during an overload or short circuit. The trip unit can be either thermal or magnetic, depending on the type of overload being protected against. The trip unit is typically adjustable, allowing for customization of the device's tripping characteristics.
Contacts
The contacts of an Mccb Breaker are responsible for making and breaking the electrical connection in the circuit. The contacts are typically made of a high-conductivity material such as copper or silver and are designed to withstand high current and voltage levels without sustaining damage.
Arc extinguishing system
During the interruption of an electrical circuit, an arc is generated between the contacts of the breaker. The arc extinguishing system of an MCCB is responsible for quickly extinguishing the arc to prevent damage to the device and surrounding equipment. The arc extinguishing system can be either magnetic or thermal, depending on the type of breaker.
Accessories
Mccb Breaker can be customized with a range of accessories to suit specific applications. These accessories can include auxiliary switches, shunt trips, under-voltage releases, and more.
Benefits of Mccb Breaker
Being moulded into a protective casing, Mccb Breaker are also more resistant to environmental influences like moisture and dust, which can shorten the lifespan of other circuit breakers. For the same reason, they are also more reliable. Because they are self-contained, there is less opportunity for moisture and dust to cause a failure by damaging the circuit breaker.
Mccb Breaker are also less likely to trip accidentally, which can be frustrating and time-consuming. Also, Mccb Breaker s provide high-current interrupter switches and are extremely easy to install on the panel.
Using an Mccb Breaker can help protect all types of electrical circuits from short circuits, overloads, and power surges. This makes them suitable for securing anything from large industrial systems to small domestic appliances. Mccb Breaker can sense faults and secure the system from risky situations. It works as a protective and switching device for feeder circuits as well.
Mccb Breaker can also be used to safely shut down any kind of system in the event of an emergency or an unexpected power failure. This makes them very useful in case of power outages or any other situation where quick action is needed to prevent damage or injury.
Additionally, many Mccb Breaker come with a reset feature that allows you to quickly restore the circuit after there has been a short-circuit or overload issue. This feature comes as a relief for those working in hazardous environments as it eliminates the need to constantly monitor the system and detect any potentially dangerous issues.
How to Choose Mccb Breaker
Current Rating
The current rating of a Mccb Breaker is one of the most crucial factors in its selection. This rating specifies the maximum continuous current that the breaker can handle without tripping. It is essential to choose an MCCB with a current rating that matches or exceeds the expected load of the circuit it will protect. Selecting an Mccb Breaker with an appropriate current rating ensures that the device can handle normal operating conditions without nuisance tripping, while still providing protection against overloads.
Breaking Capacity
Breaking capacity, or interrupting capacity, refers to the maximum fault current that an Mccb Breaker can safely interrupt without damage. This capacity must be greater than or equal to the highest potential fault current in the system where the Mccb Breaker will be installed. Properly matching the breaking capacity to the fault current ensures the Mccb Breaker can effectively protect the circuit by safely interrupting even the most severe faults. For instance, in an industrial setting with high potential fault currents, an Mccb Breaker with a high breaking capacity is essential to prevent catastrophic failures.
Trip Characteristics
Trip characteristics define how an Mccb Breaker responds to different types of overcurrent conditions. The trip curve of an Mccb Breaker shows the relationship between the current and the time it takes to trip. Different applications may require different trip characteristics to provide optimal protection. For example, circuits with motors that have high inrush currents might benefit from a delayed tripping mechanism to avoid nuisance trips during startup. Conversely, circuits that require immediate protection from short circuits need an Mccb Breaker with an instantaneous trip characteristic.
Voltage Rating
The voltage rating of an Mccb Breaker indicates the maximum voltage it can handle and safely interrupt. It is essential to select an Mccb Breaker with a voltage rating that matches or exceeds the system voltage of the application. Using an Mccb Breaker with an inadequate voltage rating can lead to insulation breakdown, arcing, and potential failure of the device. For instance, an Mccb Breaker used in a 480V system must have a voltage rating of at least 480V. Ensuring the correct voltage rating not only guarantees safe operation but also compliance with regulatory standards and safety codes.
Number of Poles
The number of poles in an Mccb Breaker corresponds to the number of electrical conductors it can simultaneously protect. MCCBs are available in single-pole, double-pole, triple-pole, and four-pole configurations. The selection depends on the specific requirements of the electrical system. A single-pole Mccb Breaker is suitable for protecting a single-phase circuit, while a double-pole Mccb Breaker is needed for two-phase circuits or split-phase systems. Three-pole Mccb Breaker are used for three-phase systems, common in industrial and commercial applications. Four-pole Mccb Breaker provide additional protection for the neutral wire in three-phase systems with a neutral. Selecting the correct number of poles ensures comprehensive protection for all conductors in the circuit.
Yueqing City, Zhejiang Province, Fangdouyan Industrial Zone. The company focuses on the field of high and low voltage electrical equipment industry, specializing in the production of universal circuit breaker series, plastic circuit breaker series, small circuit breaker series, AC contactor series, surge protector series, load isolation switch series, isolation knife switch series, control and protection switch series, double power automatic transfer switch series, high voltage components series and other products.
FAQ
Hot Tags: mccb breaker, China mccb breaker manufacturers, suppliers, factory, Nm1 Moulded Case Circuit Breaker, Firefighting Machinery Emergency Start Device, Electric Generator Transfer Switch, Electronic Circuit Breaker, moulded case circuit breaker, Direct Current Circuit Breaker
