2.14 SCHALTGERÄTE Wissenswertes von A-Z Know How from A - Z Application Please see page 4.21-4.45 und 5.6/5.7 in the catalogue Auxiliary switch They serve as signal indicator or to control operations depending on the position of the switch device. They can be used for interlocking of other switches and for remote signalling of the switch position. Cable glands metrical/PG Cable glands with PG threads in use until 2004 have been replaced completely in the enclosures made by MERZ by the metrical thread version, normally used nowadays. Anyhow, in some of the purchased enclosures the cable glands remain unchanged with PG threads. For a comparision table between metrical and PG threads please see page 2.23. Cam switches Cam switches according to their contact arrangement are fitted with switching chambers with 1,2 or 3 (series 111 only) double interrupted conduct paths. Each conduct path is arranged of 2 firmly seated terminals and one mobile contact bridge which is guided by a plunger. The contact bridge is positively opened by the cam and closed by a spring. The indexing device is available in different torques and 4 different switching angles. The finger proof cam switches are equipped with screws with captive plus-minus screw heads. All terminals are fitted with screwdriver guiding, funnel-shaped cable entries and in chamber like design. Cable end stops assure the correct insertion depth. Changeover switches Changeover switches are realized by the MERZ MN series and are either applicable to connect one source with two independent consumers or to connect two independent sources with one consumer. A typical representative of the second category is the „Net-0-Generator“ switch, which is at first disconnecting the main power supply in case of power breakdown safely from the internal net and then switching over to an independant external power generator. Changeover switches are available with up to 8 poles with or without 0-position. Code switches Are cam switches used as control switches and able to emit a binary coded switch diagram. These switches can generate at most a binary code from 0 to 11. An other type of binary code is the BCD code (using 0-9 for units/tens) which could be emulated as well by a cam switch. Compact switch The term „compact switch“ is common practice in the industry and describes a switch design of disconnect switches. It is about On-Off switches or change-over switches arranged for switchboard installation. In the majority of cases the switches are drafted for snap-on DIN rail mounting, base mounting or front mounting in the door. The terminal screws are all accessible from one side and are situated in line of the conduct. The term is not defined by any normative. The series ML0 to ML3 are the compact switch series of MERZ. Contact diagrams The contact diagrams within this catalogue are different to a DIN compatible diagram. All cam and main switch contacts are shown as normally open contacts only. Whether a contact in a certain switching position is open or closed is shown within the matrix by an X. This kind of diagram allows, especially with cam switches with lots of switching positions, a much more simple and transparent illustration of the switching functions.
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