2.20 SCHALTGERÄTE Wissenswertes von A-Z Know How from A - Z Rated uninterrupted current Iu For switching devices in switchboard installation Iu=Ith. For switching devices in an enclosure Iu=Ithe . Current a switching device can carry in uninterrupted duty (for weeks, months or even years). IEC/EN 60947-1; 4.3.2.4a REACH (Registration, Evaluation, Authorisation of Chemicals) EU-Directive No.1907/2006,18. December 2006 REACH rules the use and handling of substances (chemicals) on their own, in preparations and in articles. REACH covers all (chemical) substances, doesn’t matter whether they are dangerous or not. On the side of the industry the following companies located in the EC must take actions according REACH: • Producers (of chemicals) • Importers (who bring chemicals into the EC) • Downstream user (user of chemicals) • Traders (of chemicals) MERZ Schaltgeräte GMBH + CO KG is not producing chemicals or importing chemicals from non EU countries. Therefore we are not obliged to pre-register any substances at all. Based on the information we received from our suppliers, we expect that all substances we use are pre-registered in time. Recommended values for three-phase squirrel-cage motors with 1500 rpm at 50 Hz Rated motor currents as quoted are for normal internally and surface cooled motors. Fuse: slow-blow or gL characteristic (DIN VDE 0636) with specified lowest possible short-circuit fuse Direct start-up: max. start-up time 5 s, max. start-up current 6 x rated motor current Y start-up: max. start-up time 15 s, max. start-up current 2 x rated motor current Please see table on page 2.25 Repair and maintenance switches Repair and maintenance switches are used to safely shut down machines and facilities that are not directly connected to a control unit or may bare the risk, that the machine or facility starts operating during maintenance or repair activities. The handle of such switches must be lockable by interlocks in order to prevent workers from hazardous situations and must meet the same requirements as main switches according to EN 60204. Reversing switches Reversing switches are used to change sense of rotation of AC motors. While switching from 1 over 0 to 2 two phases of the three phase alternating current net are interchanged in order to start the motor in the opposite direction. A typical application is the switching option W___/3. where all three phases of a motor are completely separated from the net in 0-position. In the next step the motor is switched on with two interchanged phases. For motor-starter-combinations, where a net disconnector is used in front of the reversing switch, also 2 phases are interchanged. However, in this case the third phase is directly wired (switching option W___/2.). This switch is more compact but, as long as the net disconnector is not shut-off, continuously carries a load at the motor via the third phase. Reversing switches are available with or without „0“-position. Also versions with both-sided automatic retraction in „0“-position are available. RoHS EU standard 2002/95/EG (updated 21/10/2005) The main contents are listings of banned substances no longer allowed to be a component in the products after the 01.07.2006. Limit values for that substances are set for Germany in the draft of the „ElektroG” dd. 01.09.2004. In 2003 MERZ GMBH already started to identify the relevant banned substances in the affected products. MERZ
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