Last month’s column introduced the concept of an interlock. An interlock is a dependency between two processes. Process 2 cannot operate unless Process 1 is in a certain state. For example, if a ...

Using a sensor or interlock to safeguard equipment is a necessary part of any machinery guarding system, but it is only one part of that system. A simple circuit includes a safety interlock switch and ...

Specifically designed for the HVACR industry, definite purpose (DP) contactors are electrically operated switching devices. They are used for switching a power or control circuit, and are typically ...

Phoenix Contact's CONTACTRON family of solid-state contactors now includes reversing and non-reversing contactors in a variety of amperages. Jan. 7, 2011 The contactors can activate or reverse 1- to ...

Relays and contactors use a variety of technologies to switch signals and power connections. Many devices called relays use similar techniques and topologies, but the terminology can be confusing.