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  2. Multiway switching - Wikipedia

    en.wikipedia.org/wiki/Multiway_switching

    The momentary switches usually have SPDT contacts in an (ON)-OFF-(ON) configuration. Pushing the switch actuator in one direction causes the relay contacts to close; pushing it in the opposite direction causes the relay contacts to open. Any number of additional rocker switches can be wired in parallel, as needed in multiple locations.

  3. Reference designator - Wikipedia

    en.wikipedia.org/wiki/Reference_designator

    The reference designator usually consists of one or two letters followed by a number, e.g. C3, D1, R4, U15. The number is sometimes followed by a letter, indicating that components are grouped or matched with each other, e.g. R17A, R17B. The IEEE 315 standard contains a list of Class Designation Letters to use for electrical and electronic ...

  4. DIN 72552 - Wikipedia

    en.wikipedia.org/wiki/DIN_72552

    from 2nd battery and 12/24 V relay: 31 return to battery- or direct to ground 31a return to battery- 12/24 V relay 31b return to battery- or ground through switch 85d 31c return to battery- 12/24 V relay 31, 31a Electric motors; 32 return 31 33 main terminal (swap of 32 and 33 is possible) 30 33a limit 33b field 54e 33f 2. slow rpm: 33g 3. slow ...

  5. Relay - Wikipedia

    en.wikipedia.org/wiki/Relay

    A relay is an electrically operated switch. It consists of a set of input terminals for a single or multiple control signals, and a set of operating contact terminals. The switch may have any number of contacts in multiple contact forms, such as make contacts, break contacts, or combinations thereof.

  6. Reed switch - Wikipedia

    en.wikipedia.org/wiki/Reed_switch

    Reed switch diagrams from Walter B. Ellwood's 1941 patent, [4] Electromagnetic switch. It illustrates a single pole, double-throw (SPDT) device. Descriptions from the patent text are as follows: Fig. 1 - device shown in nonoperated position Fig. 2 - device shown in operated position Fig. 3 - cross-section 1 - glass envelope 2 - terminal

  7. ANSI device numbers - Wikipedia

    en.wikipedia.org/wiki/ANSI_device_numbers

    2 - Time-delay Starting or Closing Relay; 3 - Checking or Interlocking Relay, complete Sequence; 4 - Master Protective; 5 - Stopping Device, Emergency Stop Switch; 6 - Starting Circuit Breaker; 7 - Rate of Change Relay; 7F - Alternative number for Rate Of Change Of Frequency Relay ; 8 - Control Power Disconnecting Device; 9 - Reversing Device