understanding relay characteristics： key factors for reliable performance
Release time:2026-01-05 19:29:35
Relays are integral components in a wide variety of electrical and electronic circuits, from simple control systems to more complex automation networks. Their primary role is to control the switching of electrical circuits remotely or automatically using an electromagnet to actuate a mechanical switch. Understanding relay characteristics is crucial for selecting the appropriate relay for a specific application. These characteristics determine how well a relay performs in terms of reliability, response time, and lifespan. In this article, we will explore the key relay characteristics and how they impact the performance of electrical systems.
1. Contact Type and Configuration
One of the first and most important relay characteristics to consider is the contact type and configuration. Relays typically offer three types of contacts： normally open (NO), normally closed (NC), and changeover (CO). A normally open contact remains open (disconnected) when the relay is not energized and closes (connects) when the relay is activated. Conversely, a normally closed contact is closed when the relay is unpowered and opens when energized. Changeover contacts can function as either NO or NC depending on the relay’s design. The selection of contact type determines the specific control function the relay will serve in a circuit.
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