By Gunter G. Seip
The 3rd variation of this vintage reference is designed to supply authoritative assistance for engineers and technicians who've accountability for making plans, designing, development and working electric install platforms. The broadly revised scope incorporates a accomplished evaluate of traditional and cutting-edge install gear and its present utilization.
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Extra resources for Electrical Installations Handbook
14). 15). 16) also has a very interesting and original construction. Having one winding, the magnetic system of this relay has four poles (3), and an armature (2) in the shape of a cross, formed by four plates. The butt-ends of the plates are linked by means of a hollow muff with a molded axle. Another peculiarity of such relays is a protective case used as a magnetic core through which the magnetic flux is closed. This case is made of steel, making such relays quite heavy (110 g). One more interesting element is a magnetic armature damper consisting of two small stationary magnets (5) holding the armature in the initial position during vibrations that may affect the relay.
1 — winding; 2 — pole of the magnetic core; 3 — restoring spring; 4 — fixed normally open contact; 5 — moving contact; 6 — heel piece of relay; 7 — fixed normally closed contact; 8 — pusher with a small insulating ball, weighted at the end; 9 — turning armature; 10 — core. (b) Miniature MV-type relay (weighing 14 g) produced by ‘‘Elgin National Watch Co’’ in the 1960s. 1 — core; 2 — pole; 3 — supporting bracket of the magnetic system; 4 — connecting plate of the magnetic core; 5 — rotary axis of the armature; 6 — armature; 7 — pusher of the armature with a small insulating ball, weighted at the end; 8 — restoring spring; 9 — restraining arm; 10 — heel piece of relay; 11 — winding; 12 — hook-shaped outlets of the relay (for point-to-point wiring by soldering); 13 — hermetic bushing glass insulators; 14 — movable contacts; 15 — fixed contacts.
22 (a) PKH type relay (with cylindrical core). (b) PPH relay (flat-core). ’’ they were produced manually, in small series, and the materials for their production came from abroad. Due to their lack of experience, Russian scientists at first attempted to obtain general knowledge and experience regarding the most common relay designs in use at that time around the world. In 1934, Professor Matov of The Moscow Institute of Energy published the book Telephone Relays, their Construction and Design, which was the first Russian publication to present general knowledge and experience from around the world in the design of electromagnetic relays.