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MCCB (Molded Case Circuit Breaker)

Molded Case Circuit Breakers (MCCB) is a required component of electrical systems, providing overload protection and short-circuit protection. In most cases, MCCBs are installed in the main power distribution board of a facility, allowing the system to be easily shut down when necessary. MCCBs are available in various sizes and ratings, depending on the size of the electrical system.

In this guide, we’ll cover the components and features of a typical MCCB, how they work, and which types are available. We’ll also discuss the benefits of using this type of breaker in your electrical system.

It can be used for higher current rating and fault level even in domestic applications. The wide current ratings and high breaking capacity in MCCB find their use in industrial applications. MCCB can be used for protection of capacitor bank, generator protection and main electric feeder distribution. It offers adequate protection whenever an application requires discrimination, adjustable overload setting or earth fault protection.

Models
Features

Models

Product models & Details
TYPE	AMPS	POLE	BREAKING CAPACITY – 230V/415V
KM-100	50, 60, 75, 100	DP	25 KA / 10 KA
KM-100	50, 60, 75, 100	TP	25 KA / 10 KA
KM-250	125 to 250	TP	25 KA / 15 KA
KM-400	300, 400	TP	35KA / 22KA
KM-600	500, 600	TP	42KA / 30KA
KM-800	700, 800	TP	42KA / 30KA
KM-100	100	FP	35KA / 25KA
KM-250	125 to 250	FP	35KA / 25KA
KM-400	300, 350, 400	FP	35KA / 22KA
KM-600	500, 600	FP	42KA / 30KA
KM-800	700, 800	FP	42KA / 30KA

Features

Rated Current (In) is the exceeding value when the overload protection reaches its tipping point. You can modify these values in MCCB.
Rated Frame Current (Inm) is the maximum capacity value of the MCCB and dictates its ‘physical form.
Rated Insulation Voltage (Ui) is the maximum current MCCBs can handle as evidenced by the conducted tests. It is greater than the rated working voltage to give an allocated safety margin while in use.
Rated working voltage (Ue) is the uninterrupted operating voltage of MCCB. This is usually equal to or near the standard level of system voltage.
Operating short-circuit breaking capacity (Ics) is the maximum ‘fault current that MCCB can ‘trip without permanent damage. You can continue using the MCCB after a fault interruption, provided it doesn’t go beyond the limits.
Mechanical life is the number of times you can operate the device manually before it dysfunctions.