![]() ![]() The primary purpose of circuit protection devices such as MCBs is to protect the cable downstream of the device. However, an understanding of the differences between these types of device can help the specifier or installer overcome problems of unwanted tripping, disconnections times for earth fault protection or issues associated with discrimination with upstream protective devices. The decision to use Type B, C or D MCBs or RCBOs for final circuit protection in residential, commercial or industrial buildings can be based on a few simple rules. ![]() ![]() Overcurrent Characteristics of an MCB or RCBO In this particular article, we will look at the selection of MCBs and RCBOs and points to consider in this process. RCCBs – Residual Current Circuit Breakers without overcurrent protection.RCBOs – Residual Current Circuit Breakers with overcurrent protection.Installers should be familiar with these protective devices: Now they must consider which MCB or RCBO to install, with even more choice than ever on what levels of protection against the effects of electrical fault to afford. 30 years ago the specifier/installer was typically faced with the decision on what size fuse wire to use. Technology continues to evolve in the field of LV power distribution and protection. ![]()
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