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GEYA: Your Best

Molded Case Circuit Breaker (MCCB) Manufacturer

With a rated insulation voltage of 1000V, GEYA molded case circuit breaker is an excellent option for distribution applications, especially where there is a higher demand for safety against overload, short circuit, and under-voltage to maintain power supply reliability. Our durable MCCB can withstand extreme weather conditions because of its durable and compact construction.

GEYA Featured Molded Case Circuit Breaker

All GEYA Molded Case Circuit Breakers (MCCB) are manufactured in strict accordance with stringent international standards. 

Download Geya MCCB Catalog PDF

GEYA Molded Case Circuit Breaker (MCCB)

  • Rated current: 25~800A
  • Insulation voltage: 1000V
  • Rated impulse withstanding voltage: 12KV
  • Rated operation voltage: 400-690V
  • Number of Poles: 3P/4P
  • Rated short circuit breaking current: 25-100KA

All Types GEYA

MCCB Molded Case Circuit Breaker

GEYA Electrical has been designing and manufacturing low voltage products which fulfil all global industrial requirements and applications. Our current products include MCBs, MCCBs, RCDs, switch disconnectors, contactors, relays, timers, distribution boxes, and other low-voltage and automation control items, as well as a variety of related accessories and components.

GEYA keeps track of the manufacturing process to ensure that no errors occur during the development, production, acceptance, and sales of MCCB devices. GEYA focuses on building long-term relationships with its customers and support its partners in case of any need.

GEYA Electric offers over 100 products that meet the most stringent international standards, including CCC, CE, CB, SAA, SEMKO, TUV, and Rosh. In 2021, GEYA offers some of the most excellent electrical gadgets and systems. Check out our catalogue below to see all of the selection of MCCBs we offer.

What are Molded Case Circuit Breakers (MCCBs)?

GEYA Electrical has been designing and manufacturing low voltage products which fulfil all global industrial requirements and applications. Our current products include MCBs, MCCBs, RCDs, switch disconnectors, contactors, relays, timers, distribution boxes, and other low-voltage and automation control items, as well as a variety of related accessories and components.

Molded case circuit breakers (MCCB) are electrical protection devices installed to safeguard the electrical circuit from a range of defects and issues, such as excessive current or short circuits.

They usually safeguard the circuit by utilizing a combination of temperature-sensitive and electromagnetic tools sensitive to current. Using this combination, an MCCB provides trip mechanisms that protect against electrical faults.

They may use one or a combination of different tripping elements depending on the protection needed in a certain circuit. Furthermore, they can be used for a range of frequencies and voltages depending on the requirement.

What Types of Faults Can Be Protected by Molded Case Circuit Breakers?

(1) Ground Faults

These issues are the most common and are the ones in which the current flows directly into the earth (ground). They are similar to short circuits since there is a circuit bypass in this scenario as well.  

Because of the uncontrolled flow of electricity, a ground fault leads the breaker to trip. When hot wires come into contact with ground cables or ground systems, this causes problems. MCCB can readily protect these faults.


(2) Short Circuits

The flow of electricity into any unintended circuit with low resistance can be defined as a short circuit. They are short circuits because the current flows back to the source by a shorter pathway than the complete circuit. These can also be defined as any occurrences when hot wires come into contact with the neutral wires.

These defects cause the breaker to trip due to a large amount of current flowing into the circuit. Subsequently, they can cause sparking and eventually lead to fires and are caused due to the failure of insulation of the circuit. These can occur within electrical appliances such as motors as well. MCCBs can efficiently protect and help against these dangerous defects as well by their tripping mechanisms.


(3) Thermal Overloads

These overloads are another problem caused due to a temperature buildup between the insulator and the conductor. They reduce the efficiency of an insulator and may eventually cause a short circuit. MCCBs, with their mechanisms, allow for the overloads to be in check, therefore preventing short circuits and maintaining the fore of the insulator.

How Does an MCCB Work to Help Against These Faults?

Ground faults often do not have large enough amounts of arcing currents to be detected by an MCCB per se. Ground-related issues, as a result, may not be able to have the device work usually. However, they can sufficiently increase to cause tripping of the standard MCCB. Modern MCCB usually always has protection against ground faults in their units.

In the case of short circuits, the instantaneous element of an MCCB is utilized. An electromagnet performs short circuit trip action. When there is a short circuit, the electromagnetic field strength of the magnet becomes stronger due to the higher current. It causes the magnet to rotate the tripping bars or switches.

The temperature-sensitive component of the MCCB protects against thermal overloads. Whenever there is an overload happening, tripping occurs when the bimetal strip is composed of two metals with different rates of expansion bends and physically rotates the tripping bar. This causes the circuit to be disconnected immediately.

What are Some Other Uses of An MCCB?

An MCCB may have a thermal-magnetic tripping mechanism that combines both of the mentioned circuit-tripping actions discussed before. Moreover, this equipment can also manually disconnect the supply in maintenance, testing, or an emergency. This may, however, cause an arc to be created. To solve the difficult issue of arcing when the circuit contact opens, MCCB has internal arc dissipation. It is safe to close the circuit the same way.

Choosing the Right MCCB for Your Needs

All of our MCCBs come with a list of ratings and characteristics so that you can choose the device you require and which best suits your needs. To select the right MCCB, you must understand the basic characteristics and specifications of an MCCB detailed below.

(1) Mechanical/ Electrical Life

The number of times your MCCB can be operated manually refers to its mechanical life. Whereas the number of times it can withstand automatic trips before malfunctioning is its electrical one.


(2) Rated Frame Current

The maximum current an MCCB is rated to handle is known as the rated frame current. This rating determines the frame size of the breaker. The upper limit of the adjustable tripping current follows the rated frame current.


(3) Rated Current

It is a value that determines the tripping of an MCCB in case of an overload. It can be adjusted according to the requirements and be maximized to the value of the rated frame current of the product.


(4) Rated Working Voltage

As the system voltage, the rated working voltage is the value at which the MCCB operates typically.


(5) Rated Insulation Voltage

The maximum tested value that an MCCB can resist is the rated insulation voltage. It is usually higher than the rated voltage to provide a prudent margin for the MCCB to withstand high voltages.


(6) Rated Impulse Withstand Voltage

The transient peak voltage a product can handle from lightning strikes, for example, is known as the rated impulse withstands voltage. Protection from transient over-voltages depends on this rating.


(7) Operating Short Circuit Breaking Capacity

The higher the operating short circuit breaking capacity, the more reliable the product. After tripping, these generally work as before, provided this certain value is not exceeded. If the amount of current into the MCCB exceeds this capacity, we may require a replacement.


(8) Ultimate Short Circuit Breaking Capacity 

This is the value beyond which an MCCB tripping mechanism does not work, and only another breaker of higher capacity may be able to open the circuit. If the current exceeds the operating short circuit breaking capacity but does not exceed the ultimate short circuit breaking capacity, then the MCCB will work, but it will be damaged.

To choose the product which best suits your application and use, you must make sure that the breaking capacity of the MCCB should be higher than the expected maximum value of current in case of any overloads or faults. The tripping value should also be in line with the current returning to the supply according to your load, while the rated working voltage should be similar to the system voltage.


MCCB Molded Case Circuit Breaker

GYCM3, GYCM3L, and GYCM3E (copyright) series circuit breakers are three of our updated products produced by international safety standards. These articles from our series have a rated insulation voltage of up to 1000V and are ideal for power distribution networks with AC 50Hz frequency. It has a rated voltage of 400V (690V) and a rated current of 800A. It is used to transmit electrical energy and save circuit power equipment from various defects such as the ones mentioned above. The wide variety of breakers we provide have a compact design with a high breaking capacity and a short flying arc. In addition, they can be mounted vertically or horizontally.

GEYA MCCB complies with all standards and regulations, including iec60947-2, GB/T14048.2.

With a rated insulation voltage of 1000V, the GEYA molded case circuit breaker is an excellent option for distribution applications, especially where there is a higher demand for safety against overload, short circuit, and under-voltage to maintain power supply reliability.

Molded Case Circuit Breaker(MCCB) trip curve/characteristic curve diagram:

Why Choose

GEYA Molded Case Circuit Breaker (MCCB)

  • Compact architecture, strong structure, high breaking strength, high short arcing withstanding capability, and vibration resistance
  • Installation is made easier by the fact that it can be done vertically or horizontally
  • Maintenance protection is improved by the design’s insolation feature
  • Compact design
  • The product’s size is more compact, and it meets a variety of customer installation specifications
  • Uniform size
  • Under same case grade, unformed installation dimension for different breaking capability (S, H), different function (air, leakage).
  • Optimized function parameter setting
  • Applicable working and installation condition
  • Attitude below 2000 meters
  • Ambient temperature is < +40℃(+45℃ for Marine products) and > -5℃
  • Resistance against humidity
  • Resistance against mold
  • Resistance against nuclear radiation
  • Maximum inclination 22.5°
  • Work reliably under normal vibration of the ship
  • Work reliably in case of an earthquake (4g)
  • To be installed in an environment without conductive dust, explosion risk, and metal parts and insulation shall
  • Protection against corrosion
  • Protection against rain and snow
  • Easy application
Contact Us

GEYA Electrical Equipment Solution

At GEYA, we understand the need for keeping all devices safe, while making your business competitive. With over 10 years’ experience, GEYA products are certified CCC, CE, CB, SAA, SEMKO, TUV and ROSH industry standards.

Additionally, GEYA engineers help clients in choosing the best materials depending on the application. As a leading Molded Case Circuit Breaker (MCCB) manufacturer, GEYA adheres to a strict quality electrical process. Feel free to contact us for custom made and affordable Molded Case Circuit Breaker (MCCB).

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