General Purpose Relays: An Overview
Relays play a crucial role in various control circuits and applications. Among them, General Purpose Relays stand out as versatile devices with wide-ranging uses. Let’s delve into what they are, their features, and some examples.To get more news about General purpose relay, you can visit our official website.
What Is a General Purpose Relay?
A General Purpose Relay is a device equipped with contacts that open or close a switch in response to an input signal (voltage or current) applied to a coil. These relays find applications in most machines and devices that use electricity1.
Types of General Purpose Relays
Hinged Relays: These relays use a common structure where the armature of the electromagnet rotates around a fulcrum. The movement of the armature directly or indirectly opens and closes a contact. Examples include the MM (K), MK (S), MY, LY, G2R (S), G2RV, and G7T relays.
Built-in Relays: Designed for carrying currents up to 40 A, built-in relays are integrated into devices to turn ON load power supplies. Notable examples are the G7Z, G7J, and G7X relays.
Work-Saving Relays: These relay units are ideal for I/O applications in programmable controllers when downsizing and work efficiency are essential. Look out for models like the G6D-F4B and G6B-4BND.
Relays for Special Operations: These specialized relays cater to specific applications, such as alternative operation and stepping operation of pumps. Examples include the G4Q, G9B, and MYA relays.
Relays for PCBs: Mounted on printed circuit boards (PCBs), these relays serve specialized purposes. Check out the G5NB and G2RL relays1.
How Do General Purpose Relays Work?
Let’s take a closer look at the operating principle of a hinged relay:
The input device (usually a switch) is turned ON.
Current flows through the magnet (coil), magnetizing the core.
Magnetism attracts the armature to the core.
As the armature moves, the moving contact touches the fixed contact, completing the circuit.
When the input device is turned OFF, the release spring stretches out, separating the contacts1.
Conclusion
General Purpose Relays are essential components in electrical systems, providing reliable switching functionality. Whether in control panels, built-in devices, or specialized applications, these relays ensure seamless operation across various industries.
