Ads
related to: relay latching applicationsebay.com has been visited by 1M+ users in the past month
Search results
Results from the WOW.Com Content Network
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.
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.
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.
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.
Schematics from the Eccles and Jordan trigger relay patent filed 1918, one drawn as a cascade of amplifiers with a positive feedback path, and the other as a symmetric cross-coupled pair The first electronic latch was invented in 1918 by the British physicists William Eccles and F. W. Jordan .
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logic circuits were employed from the 1930s onward to replace the human elevator operator, but have been progressively superseded with modern solid-state controls in recent years.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.
Ads
related to: relay latching applicationsebay.com has been visited by 1M+ users in the past month