In Part 4 of "Understanding Alarm Trips", we move from alarm types to the mechanics of how those alarms take action. This video breaks down the fundamentals of relay responses, covering the difference between Normally Open (NO) and Normally Closed (NC) contacts, and why this choice matters in designing your alarm logic. We’ll also explore the most common relay configurations, Single-Pole/Single-Throw (SPST), Single-Pole/Double-Throw (SPDT), and Double-Pole/Double-Throw (DPDT)—showing how each works, when to use them, and how they can trigger anything from a simple indicator light to a multi-step safety shutdown. By understanding these contact types and relay setups, you can match your alarm trip’s physical response to your exact process needs, ensuring reliable performance when it matters most.
Watch Part 1: Moore Industries Alarm Solutions for Process Safety
Watch Part 2: "Hard" vs. "Soft" Alarms
Learn more about Moore Industries Alarm Trip Solutions here.
