A transformer protection relay does not replace upstream devices. It defines responsibility. By clearly assigning fault ...

Protective relay testing verifies that installed relays will trip correctly under real fault conditions, confirming settings, ...

Power systems today operate in an environment where reliability and safety must be maintained despite rising loads, expanding ...

[Alex] was tasked with a control design problem for a set of motors. The application called for the back of a truck to open up, some 3D scanning equipment to rise from its enclosure, and finally the ...

Ladder logic uses switch or relay contacts to implement Boolean expressions. In years past, ladder logic was made possible with discrete relays and was sometimes termed “relay logic.” Today most ...

This file type includes high resolution graphics and schematics when applicable. According to the research firm IHS Inc., about 54 million relays and timers were purchased in 2013, a number projected ...

Some control applications are too small or simple to use even the smallest PLC, but still need more flexibility than a simple relay. That's why engineers at Schneider Electric, Palatine, Ill.

Here’s a really fascinating circuit that implements a combination lock using relays and logic gates. Even with the schematic and written explanation of how it works we’re still left somewhat in the ...

Featuring a built-in surge suppressor to eliminate the need for separate relays for ac and dc applications, the two-pole C12 interfacer contact relay can link PC or PLC logic to machine operation. The ...

Relays are clunky, switch slowly, have contact bounce, and make noise, both acoustically and electromagnetically, so why are they still used? Relays are clunky, switch slowly, have contact bounce, and ...