Features

manual operated main switch must be provided for every mains circuit. It must be a switch-disconnector corresponding to utilization category AC23 (IEC 947-3) fulfi ls the following requirements:

• Disconnecting the electrical equipment from the main
• Visible contact indication or a disconnection function by construction (the handle is in the "OFF" position when all contacts are open)
• If the main switch does not serve simultaneously as an emergency-stop switch, its handle should not be red. Black or grey handles are recommended
• It should be lockable in the off-position (e.g. by padlock)
• All active conductors are to be disconnected from the main
• The breaking capacity should be sufficient. In order to break the current of the largest motor in a blocked state together with the sum of the operating currents of the remaining motors/loads
• The handle of the main switch must be easily accessible and must lie between 0.6 and 1.9 m above the incomer level

Emergency-stop equipment

The main switch may fulfi l the function of an emergency-stop switch on certain machines.

The handles must be red on a yellow background.

The contacts of manual operated emergency-stop switch has to be opened by force.