700-HPS Plug-in Safety Relay Application Guide

This document addresses the common relay failure of welded contacts and the unsafe conditions it creates, contrasting traditional circuit shortcomings with the preventive solution offered by the 700-HPS Plug-in Safety Relay. It explains how mechanically linked contacts with a "Type B" rating enable immediate detection of welded contacts through signal monitoring, and describes how to achieve single-fault tolerance through redundant relay configurations.