LVD75E100H

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Solid State Relays (SSRs) are electrically controlled switches designed to replace traditional electromechanical relays. They feature a wide range of advantages, most notably no arcing or contact bouncing, excellent switching performance, long life, and high pulse repetition rate. The LVD75E100H Solid State Relay is a type of SSR that is designed to provide low-voltage DC control across high-voltage AC loads. In this article, we will discuss the application field and working principle of the LVD75E100H Solid State Relay.

Application of the LVD75E100H

The LVD75E100H solid state relay is ideal for a variety of applications, including powering electronics from low voltage AC/DC power sources to activate or deactivate higher voltage AC loads such as lights, motors, and solenoid valves. It also finds use in the control of high-voltage switching functions and is ideal for applications where it is necessary to switch large currents in low-loss, low-voltage DC circuit configurations. Other applications include medical instrumentation, alarm systems, and material handling equipment.

Working principle

The LVD75E100H Solid State Relay contains an opto-coupler and a solid-state switch in a single package. The opto-coupler isolates the user’s low-voltage DC control circuit from the main AC load. This separation between the two circuits eliminates arcing, spark gap, and across-the-line switching issues.

The opto-coupler incorporates an LED and a phototransistor. The LED is activated by an external DC control current. The light produced by the LED illuminates the photosensitive material on the phototransistor and a corresponding current is then generated. This current is used to activate the internal switch in the SSR, which then closes, activating the main AC load.

When the LED is not illuminated, the phototransistor does not generate current and the switch is open, preventing current from flowing to the load. This mechanism provides excellent control of the load at very low power levels and allows high-speed AC switching.

The LVD75E100H Solid State Relay is a reliable and versatile device and is used in a variety of commercial and industrial applications. It is a suitable choice for applications where a low-voltage DC control circuit is available and a high-voltage AC load needs to be activated or deactivated.

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