What It Is & Where It Goes
The QS90SR2SN-EX: Safety relays like this one are the decision-making link in a safety circuit — they monitor the status of e-stop buttons, light curtains, or gate switches and, when a fault is detected, drop out the contactor that feeds power to the guarded zone. The N-type designation means the output configuration uses normally-open contacts that close to enable the machine, which is the standard arrangement for most safety applications.
