Technology is advancing at an ever increasing rate. Safety is no exception to the advances of technology. In the not too distant past, safety devices on a machine only included mechanical guards, properly sized and selected components, and emergency stops that when pressed would cause the machine to stop moving. Fast forward to today& there is a whole new set of advances in safety devices and practices. The desire to create circuits that continued to function in the event of a failure brought forth the concept of Control Reliable and safety relays.
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