Moulded Case Circuit Breaker
Why Choose Us
Business philosophy
The company always adheres to the business philosophy of "survive by quality, develop by technology, and achieve efficiency by management", and meets the current and future needs of customers with high-quality electrical products and services.
Rich industry experience
The company has been continuously upgraded through diversified sales products and services over the years, and has been praised by the majority of users! And enjoy a good reputation and credibility among consumers, and with a number of supporting manufacturers and agents to establish long-term stable cooperative relations.
24-Hour Service
Our dedicated 24-hour online support ensures prompt responses, providing you with an excellent shopping experience. Feel free to reach out with any questions at any time.
Fast delivery time
We have optimized production processes and supply chain management to achieve fast delivery times. With our advanced production scheduling system, we are able to accurately predict production cycles and respond quickly to order needs.
What is Moulded Case Circuit Breaker
MCCBs are specially designed circuit breakers that feature thermal magnetic and electronic overcurrent protection mechanisms. These devices are capable of providing reliable circuit protection in various application scenarios by detecting and responding to abnormal electrical conditions. When a fault condition such as an overload or short circuit occurs, the MCCB automatically interrupts the circuit, thereby preventing potential damage to electrical equipment, wiring, or even preventing fires.
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Mccb Moulded Case Circuit BreakerThe adjustable trigger current function allows users to adjust the rated current value of the MCCB according to the specific needs of circuits and application scenarios.read more -
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Moulded Case BreakerMCCB, or molded case circuit breaker, is an electrical protection device mainly used to safeguard circuits and electrical equipment from overload, short circuits, and other faults.read more -
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Moulded Case Circuit BreakersOverload Protection: MCCBs can quickly cut off the circuit when the current exceeds the rated value, effectively preventing equipment damage from overload. This rapid response capability is...read more -
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Molded Case BreakersMCCBs offer multiple protection functions such as overload and short-circuit protection. The trigger current is adjustable, allowing flexible configuration according to specific needs.read more -
![Mccb Molded Case Circuit Breaker]()
Mccb Molded Case Circuit BreakerThe MCCB is designed to quickly cut off the circuit when the current exceeds the rated value, preventing equipment damage from overload. This is its most basic and crucial protection function.read more -
![Mold Case Circuit Breaker]()
Mold Case Circuit BreakerMCCB focuses primarily on providing comprehensive electrical protection, including overload and short circuit protection. Its design emphasizes structural robustness, reliability of internal...read more -
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Molded Case Circuit Breaker MccbMCCB achieves circuit protection primarily through mechanical structure and thermal magnetic effects. When the current exceeds the rated value, the thermal element heats up, causing the bimetallic...read more -
![Moulded Case Circuit Breaker Mccb]()
Moulded Case Circuit Breaker MccbThe service life of a molded case circuit breaker is a relatively complex issue because it is affected by many factors, including but not limited to design quality, manufacturing process, usage...read more -
![Abb Molded Case Circuit Breaker]()
Abb Molded Case Circuit BreakerWhen operating the opening button of the MCCB circuit breaker or attempting to open it through other control methods, the MCCB fails to operate normally.read more
Application of Moulded Case Circuit Breaker
Motors
Molded Case Circuit Breaker protect motors by having their settings modify the inrush current and give the delay it may need. When done correctly, the motors are protected from overloads without triggering the tripping mechanism.
Welding Machinery
Welding machines utilize high currents, which normal circuit breakers cannot handle. An Molded Case Circuit Breaker can be used to protect welding machines by connecting the machine to its own circuit breaker.
Generators
It is widely known that generators produce high levels of amps and need costly gen-sets. To shield the linked circuits and generator from faults that may happen in the system, having an Molded Case Circuit Breaker is essential as it can handle its high current ratings and protects your generators as needed.
Capacitor Banks
Molded Case Circuit Breaker lessens the currents, which in turn, corrects the ‘power factor’ in commercial and industrial-level systems.
Modifiable Trip Modes
These settings allow Molded Case Circuit Breaker to be utilized in low-current appliances in the household. This makes it an all-rounder use as it can be adjusted between low and high-current settings.
Electric Feeders
Molded Case Circuit Breaker has adjustable settings that can be adjusted and allows it to handle high currents. If applied to electric feeders that produce hundreds of amps, MCCB can dissipate these energies easily. It also acts as its primary ‘incoming breaker.
Parts Of Moulded Case Circuit Breaker
In order to understand the Moulded Case Circuit Breaker circuit breaker better, it’s crucial that examine its parts and how they help the device perform its intended functions. The main MCCB components are listed below:
Molded Case: This is the outer shell of the Moulded Case Circuit Breaker, which encloses all of the other components and protects them from external damage. The circuit breaker molded case also provides insulation.
Load and Line Terminals: Moulded Case Circuit Breaker terminals are the primary connection points for attaching conductors. The upper terminals connect to the load, while the lower terminals connect to the line side.
Contacts: The contacts are generally made of a silver alloy. They provide the necessary connection between the load and line sides of the circuit breaker. They also open and close when the breaker trips.
Operating mechanism
This is composed of various parts. The molded case circuit breaker operating mechanism is responsible for opening and closing the contacts when required.
Trip Unit
The Moulded Case Circuit Breaker trip unit is component that senses an overload or a fault in the circuit and activates the operating mechanism to open the contacts.
Handle
The Moulded Case Circuit Breaker handle is the user’s interface with the breaker. It can be used to manually open or close the contacts, as well as to reset a tripped circuit breaker when necessary.
Arc Chute
When the breaker contacts open, an arc is created. The arc chute directs the arc away from the contacts, reducing arcing and resulting in a safer operation.
Tips For Choosing The Right Moulded Case Circuit Breaker
Calculate The Electrical Load
Be sure your circuit breaker is capable of protecting the load. Always remember that some loads may draw more power under certain circumstances. It’s a good idea to leave yourself room for error.
Evaluate the Entire Installation Environment
The conditions inside wiring runs, breaker panels, and conduits are just some of the things you need to inspect. Molded case breakers must also withstand varied temperatures and humidity levels, especially in large spaces like warehouses. In some cases, they’ll even have to resist vandalism or contaminants.
Check the Breaker Specifications
Finally, remember to match your breaker’s specifications to each job. Review industrial drawings and product pages to learn more about form factors, terminal layouts, and sizes.
Understanding Moulded Case Circuit Breaker Features And Ratings
Rated Current (In): The tripping point of the MCCB during overload protection.
Rated Frame Current (Inm): The maximum current that the device can handle. It determines both the frame size of the breaker and the upper limit of the rated current.
Rated Working Voltage (Ue): The rated voltage for the constant use of the MCCB.
Rated Insulation Voltage (Ui): The highest voltage that the MCCB can protect against in laboratory conditions.
Rated Impulse Withstand Voltage (Uimp): This value represents the circuit breaker's ability to endure transient peak voltages resulting from switching surges or lightning strikes, thus determining its resilience against transient over-voltages.
Ultimate Short Circuit Breaking Capacity (Icu): The maximum fault current value that the MCCB can withstand.
Operating Short Circuit Breaking Capacity (Ics): The maximum fault current that the MCCB can withstand before being permanently damaged. The higher this value, the more robust the MCCB.
Electrical Life: The maximum number of trips the MCCB can withstand before becoming non-operational.
Mechanical Life: The maximum manual operations allowed before the MCCB fails.
Being moulded into a protective casing, Moulded Case Circuit 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.
Moulded Case Circuit Breaker are also less likely to trip accidentally, which can be frustrating and time-consuming. Also, Moulded Case Circuit Breaker provide high-current interrupter switches and are extremely easy to install on the panel.
Using an Moulded Case Circuit 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. Moulded Case Circuit Breaker can sense faults and secure the system from risky situations. It works as a protective and switching device for feeder circuits as well.
Moulded Case Circuit 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 Moulded Case Circuit 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.
Specifications Of Moulded Case Circuit Breaker
A moulded plastic case houses the circuit breaker’s components. This offers an extra layer of protection for the breaker. The breaker has three main components—a trip unit, an operating mechanism, and an arc extinguisher.
Current Rating
The current rating specifics the highest current the Moulded Case Circuit Breaker can continuously carry while maintaining safety. MCCBs can actually carry a little over the current rating, but only for limited time. Moulded Case Circuit Breaker current ratings range from 10A-2500A. Matching the current rating with your machinery’s current should be your first consideration when choosing an Moulded Case Circuit Breaker.
Breaking Capacity
The breaking capacity is the highest voltage an Moulded Case Circuit Breaker can interrupt without damaging equipment or the arc. Choose an Moulded Case Circuit Breaker with a high enough breaking capacity to manage your equipment.
Tripping Characteristics
Moulded Case Circuit Breaker allow you to adjust tripping characteristics to meet your needs. You can set the Moulded Case Circuit Breaker to trip at various overload currents.
Key Considerations In Choosing An Moulded Case Circuit Breaker
Current Rating
Typically expressed in amperes (A), the current rating indicates the maximum amount of current a breaker can handle without tripping or overheating. This is a crucial factor in choosing an MCCB since having an inappropriate MCCB current rating may damage your system or cause an accident.
Breaking Capacity (Icu)
Breaking capacity is the maximum amount of fault current, the current during a short circuit or fault condition, the circuit breaker can safely interrupt without getting damaged. It is important for this to match your system’s power level to ensure safety.
Operating voltage
There are three things pertaining to voltage that must be considered when choosing an MCCB. First is the system voltage. The next one is the rated operation voltage or the amount of voltage the MCCB is designed to function optimally. The last one is the insulation voltage which is the amount of voltage the MCCB can withstand without its parts breaking down.
Status indicator
Status indicators visually indicate the condition of MCCBs. They are crucial to have enhanced monitoring and quick troubleshooting of your system.
Working Principle Of Moulded Case Circuit Breaker
Overload Protection
Overload occurs when the current exceeds a limit for a prolonged duration. MCCB has a thermal mechanism that contains a bimetallic contact to protect from overload. A bimetallic strip is made from two different types of metal having different rates of thermal expansion. Upon temperature change, the strip bends or contracts.
The main current passes through the bimetallic strip. If the current exceeds a certain limit, the contacts heat up and expand. Due to different expansion rates, the strip bends and trips the circuit.
In electrical devices, the current can overload for short durations of time, it is normal and should not be considered as fault current. Therefore, MCCB has a time delay that allows the overload current for a short duration of time before tripping the circuit.
Short Circuit Protection
Moulded Case Circuit Breaker protects against a short circuits using a solenoid that produces electromagnetic force. The main current flows through the solenoid that attracts and repels a plunger responsible for tripping the breaker. If the current remains below the threshold, the solenoid produces a weak magnetic force that cannot attract the plunger. In short circuit conditions, a very high current flows through the solenoid that generates a very strong magnetic force. It attracts the plunger that trips 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
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