MCCBs

DBI Control’s partnerships with leading manufacturers Siemens, Allen Bradley and Schneider Electric means we have a wide range of MCCB’s on offer, with discounts available, to suit any requirements you may have.

Moulded case circuit breakers are a type of electrical protection device, that are commonly used when load currents exceed the capabilities of miniature circuit breakers.

They are an electrically operated switch designed to protect an electrical circuit from damage caused by overcurrent, typically resulting from an overload or short circuit.

They are also used in applications of any current rating that require adjustable trip settings, which are not available in plug-in circuit breakers and MCBs.

A moulded case circuit breaker, abbreviated to MCCB, can be used for a wide range of voltages, and frequencies of both 50 Hz and 60 Hz.

The main distinctions between moulded-case and miniature circuit breakers are that MCCBs can have current ratings of up to 2’500 amps, and its trip settings are normally adjustable.

An additional difference is that MCCBs tend to be much larger than MCBs.

The basic function of an MCCB is to interrupt current flow after a fault, once the fault is corrected the circuit breaker can be reset (either manually or automatically) to resume normal operation.

Although MCBs and MCCBs are both circuit breakers, there are key differences between the two that make them suitable for specific jobs.

The main difference between the two is the capacity, MCBs are rated under 100 amps with an interrupting rating of under 18’000 amps. Consequently, the trip characteristics may not be adjusted since they cater to low circuits.

On the other hand, an MCCB comes with an adjustable trip characteristic for the higher loads. An MCCB would typically provide amps as high as 2’500 or as low as 10, depending on the application. The interrupting rating of MCCBs range from around 10’000 amps to 200’000 amps.

The wide range of current ratings available for moulded-case circuit breakers allows them to be used in a wide variety of applications; both low-power and high-power.