2.17 Multi-speed switch Multi speed switches are used for motors with 2 or more windings in order to vary the motor speed. There a several different versions available since the windings of such motors are either directly accessible via the motor terminal board or internally wired (Dahlander with tapped windings). Neutral conductor According to the German normative the neutral conductor might be switched, this without being a must. This differs e.g. of the situation in France. There the normative requires the disconnection of the neutral conduct of any equipment or machine equal to the other active conductors. This can be achieved by the MERZ cam switches (MN) due to their multitude of contact arrangements as well as by the MERZ compact switches (ML). Corresponding to the series the contacts are else integrated in the basic versions or available as separate additional switch contacts for add on mounting. The switched neutral contact has to break after the other contacts and to make in advance of the other contacts! IEC/EN 60947-1; 8.1.9 Norms KEMA KEUR, UL, CSA, CCA Protocol All MERZ switchgear products are under steady inspection in our own test facilities. Beside that, all products have been tested by independent notified bodies and are subject to KEMA, UL and CSA approvals. Within Europe and the countries located at the Mediterranean Sea the notified bodies have agreed, that the testing must be performed according to the IEC/EN norms and is therefore mutually valid. Because of this regulation all MERZ switchgears are carrying the KEMA KEUR sign and are CCA certified which is documenting the international acceptance. On-Off switch Switch breaking or making one or multiple mains contacts simultaneously. Additional auxiliary contacts (NO/ NC) making/breaking as well in contrary can be included. Auxiliary contacts of series ML can carry up to 10A. Auxiliary contacts of series MN usually carry the same current as the main contacts. Exception is made at very large cam switches only, where a small auxiliary is coupled. (switch coupling). Outside diameter of lines and cables Outside diameter of lines and cables. Please see table on page 2.24 Overload Operating conditions that are causing an overload current within an electrically correct circuit. Permissible current load of lines Permissible current load and protection against overload of lines and cables for permanent installation at ambient temperatures of 25°C (Supplement 1 to DIN VDE 0100 Part 430) See table on page 2.24 Polyamide (PA) finds application in the manufacture of unbreakable household items and technical parts where high abrasion resistance is required, such as dowels, screws, housings, bearings, insulation parts for electrical systems, cable ties, adhesive bases, etc. Because of its resistance to lubricants and fuels at temperatures up to over 150 °C it is also used in vehicle
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