enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Relay - Wikipedia

    en.wikipedia.org/wiki/Relay

    A stepping relay is a specialized kind of multi-way latching relay designed for early automatic telephone exchanges. An earth-leakage circuit breaker includes a specialized latching relay. [clarification needed] Very early computers often stored bits in a magnetically latching relay, such as ferreed or the later remreed in the 1ESS switch.

  3. Mercury relay - Wikipedia

    en.wikipedia.org/wiki/Mercury_relay

    Mercury relays have also been produced as latching or impulse relays. The Lenning design uses a horizontal glass tube with two axially isolated pools of mercury. [2] A conductive stirrup can bridge these to make the connection. The relay is controlled by the stirrup being rotated in and out of the pool along the horizontal axis of the tube.

  4. Reed relay - Wikipedia

    en.wikipedia.org/wiki/Reed_relay

    A few million reed relays were used from the 1930s to the 1960s for memory functions in Bell System electromechanical telephone exchanges. [2] Often a multiple-reed relay was used, with one of the reeds latching the relay, and the other or others performing logic or memory functions.

  5. Automatic test switching - Wikipedia

    en.wikipedia.org/wiki/Automatic_test_switching

    A latching feature makes the latching relay type very appropriate for low-voltage applications where contact potential can interfere with the measurement. Reed relays have actuation times of 0.5 ms to 2 ms and long life. By design, reed relays can only handle a portion of the signal range that electromechanical relays can offer.

  6. Relay logic - Wikipedia

    en.wikipedia.org/wiki/Relay_logic

    Elevators are another common application - large relay logic circuits were employed from the 1930s onward to replace the human elevator operator, but have been progressively superseded with modern solid-state controls in recent years. Relay logic is also used for controlling and automation purposes in electro-hydraulics and electro-pneumatics.

  7. Flip-flop (electronics) - Wikipedia

    en.wikipedia.org/wiki/Flip-flop_(electronics)

    This configuration prevents application of the restricted input combination. It is also known as transparent latch , data latch , or simply gated latch . It has a data input and an enable signal (sometimes named clock , or control ).

  8. Ladder logic - Wikipedia

    en.wikipedia.org/wiki/Ladder_logic

    Ladder logic was originally a written method to document the design and construction of relay racks as used in manufacturing and process control. [1] Each device in the relay rack would be represented by a symbol on the ladder diagram with connections between those devices shown.

  9. Earth-leakage circuit breaker - Wikipedia

    en.wikipedia.org/wiki/Earth-leakage_circuit_breaker

    An ELCB is a specialised type of latching relay that has a building's incoming mains power connected through its switching contacts so that the ELCB disconnects the power when earth leakage is detected. The ELCB detects fault currents between line and earth (ground) conductors within the portion of the installation it protects.