Therefore they are recommended to be used in two-level consecutive system of protection where BA 67-29 or BA 67-100 switches can be the second step. For reliable work of protection it is recommended to take rated current of VD switches one position above, than the chosen rated current of VA (for example if VA is chosen on current 32 A, then VD is chosen on current 40 A). Switches are issued in bipolar - VD67-2 and quadripolar - VD67-4 execution with performance data like EXPERT. Switches with the characteristic the EXPERT are intended for work in a network of an alternating sinusoidal current with insignificant distortion of a sinusoidalnost. For working capacity control switches are supplied with the TEST button.
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Switches the VD 67 differential series (UZO - the device of protective shutdown) are intended for protection of people against defeat by electric current, and also electric equipments from emergence of the fires. UZO disconnects an electric chain in case of emergence in a leakage current protected zone more than the chosen differential current of a setting. And, settings on currents to 100 mA, generally carry out protection of the person against electrodefeats, and over 100 mA - protection against the fires caused by earth leak currents. The considered series of switches does not provide protection of a chain against overloads and overcurrents.
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Switches VD differential series of the 67th ha hma