2946780

Series:	*
Packaging:	Bulk
Part Status:	Active
Mounting Type:	DIN Rail
Package / Case:	Module
Supplier Device Package:	Module

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2946780 Solid State Relays: Application Field and Working Principle

Solid state relays (SSRs) are contactless electronic switches which utilize light or solid state devices as switching elements, such as opto-isolators or MOSFETs. They are a compact, low-cost and reliable tactile switching solution. SSRs can be used in various applications involving AC and DC power, such as motor speed control, burn-in testing, ON/OFF and momentary control, and feedback from sensors. They are widely used in industrial automation, process control, HVAC, test and measurement, medical, lighting control, power conditioning, and temporary power control. In addition, they are widely used in home automation, consumer and broadcast electronics, and aerospace.SSRs are electrically insulated, allowing mains and output circuits to be safely separated. They also provide a high degree of isolation between the input and output circuits, meaning there is low leakage and low electromagnetic interference (EMI). The working principle of an SSR is based on two distinct phenomena: IGBT (Insulated Gate Bipolar Transistor) and Triac (Triode for Alternating Currents). When an input voltage is applied the IGBT transfers charges to the Triac which allows current to flow through the load. Therefore, the SSR is responsible for controlling the current flow through the load.In general, there are two basic types of SSRs: panel mount and contactor type. Panel mount SSRs are typically encased in a plastic housing and come with mounted terminal blocks or lugs for easy installation. Contactor type SSRs are designed for direct mounting onto a surface and come with a contactor or switch that allows the user to manually control the current flow.When it comes to the safety of SSRs, they are generally more reliable as they have less contact sparking and no mechanical wear or fatigue over time. The insulated electronics help to prevent short circuits, ensuring the user that it is safe to operate. Additionally, when SSRs are in use and the voltage goes above the rated voltage, they will self-short and provide protection from overloads, making them ideal when it comes to safety.In conclusion, SSRs are an indispensable part of modern industrial process control and automation. They are small, cost-effective, and reliable. Most importantly, they enable precise control of current flow and are much safer to use than traditional relays. As a result, SSRs are often the preferred choice of many engineers requiring a risk-free and reliable switch solution.

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