Relay Connection | Relay & Circuit Breaker | WAGO India

1. Difference between relay and relay module Relays are essential components in electrical automation systems, whether industrial or home. The relay was invented in 1835 by American electromagnetism scientist Joseph Henry. It is a remote switch controlled by current, magnetism, or temperature. What is a relay? It is an electrical switch that opens and closes circuits electromechanically or electronically. Relays perform different tasks in industrial control applications such as switching, separating, amplifying, multiplying, etc. Relays are of essentially two types electromechanical (EMR) and solid-state (SSR). Both types of relays remain immensely popular. However, the usage totally depends on the electrical requirements of the consumer. It functions on the principle of electromagnetic attraction. In EMR, contacts open or close by magnetic force, while in SSR, switching happens electrically and does not contain contacts. When the relay circuit senses the fault current, it energizes the electromagnetic field, which produces a temporary magnetic field. It permits the transferable contacts to make or break a connection with the fixed connection. When the relay is de-energized, closed contacts automatically start and break the connection and vice versa. While the small-power relay contains only one contact, the high-power relay includes two contacts for opening the switch. What is a relay module? However, the relay module is different from the relay. A relay module comes with an array of one or more relays. EMR vs. SSR EMR: These relays are developed with electrical, mechanical, and magnetic components. They are created with a coil that generates a magnetic field when energized. This magnetic field attracts the armature, which closes or opens the contacts.

2. SSR: Solid-state relays are circuits with various electronic components that have the same operation as the earlier Electromechanical relay. They use solid-state elements to execute the switching process without any moving parts. Parts of Electromechanical Relay An electromechanical relay comprises a wire loop folded over a soft iron core, or solenoid, an iron yoke that delivers a low reluctance path for magnetic motion, a flexible iron armature, and sets of contacts. •Frame •Coil •Armature •Contacts Parts of SSR •Input circuit •Optocoupler •Output driver circuits •Semiconductor switching devices Types of Electromechanical Relays •General Purpose Relays •Reed Relays •Machine Control Relays Types of Solid Types of Solid- -State Relays State Relays •Zero-Switching Relays •Instant On Relays •Peak Switching Relays •Analog Switching Relays Functions of Relay The relay module comprises three high voltage terminals on one side: Normally Closed (NC), Common terminal (C), and Normally Open (NO). These terminals attach to the device that you want to handle. The other side also has three low voltage pins, Ground, Vcc, and Signal, that join Arduino. Relay applications Relay applications •Lighting control systems •Home appliances

3. •Telecommunication •Industrial process controllers •Traffic control •Motor drives control •Protection systems of electrical power system •Computer interfaces •Automotive Channel Types Channel Types •Single Channel Relays •Dual-Channel Relay Module •Four-Channel Relay •8-Channel Relay Module Conclusion Relays and relay modules are used to control a circuit by an independent low-power signal or several circuits by one signal. So, it is important to choose between relay and relay modules per needs. For More Details Please Contact :- WAGO Private Limited, Block No. 94 (Vadsala Varnama) N. H. 08, Vadodara, Gujarat - 391243, India. Phone: +91-265-6812100 E-mail: marketing.india@wago.com