OSSRD1003A Relays

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Solid State Relays are becoming increasingly important components of modern electrical engineering. Generally speaking, they are an ideal replacement for electromechanical relays in many applications. In this article, we will discuss the application field and working principle of the OSSRD1003A solid state relay.

The OSSRD1003A is an industry-leading solid state relay designed for high reliability and low on-state resistance duties. This makes it ideal for applications that require the controlling of high current loads with minimal heat dissipation. It is suitable for both AC and DC control applications and is suitable for controlling power up to 330V. Due to its high reliability, this relay can be used in various applications such as HVAC, air handling systems, industrial process control systems, and home appliances.

The OSSRD1003A features a pair of reverse-blocking IGBTs which work together to control the current flow. The pair of IGBTs are arranged in an anti-parallel configuration, with the plus terminal of one transistor connected to the minus terminal of the other. This arrangement allows the IGBTs to function as a bidirectional switch. When the load voltage is lower than the control voltage, the IGBTs remain open, allowing current to flow freely. When the load voltage is higher than the control voltage, the IGBTs become saturated and close, blocking the current.

The OSSRD1003A also features a built-in single-pole, two-position (SPST) switch. This switch is used to enable the operation of the IGBTs. When enabled, the IGBT pair functions as a bidirectional switch, allowing current flow between the load and control sides. When disabled, the IGBT pair opens, blocking all current flow.

In addition, the OSSRD1003A has an opto-coupler which is used to sense the load voltage and control voltage. The opto-coupler is connected to the IGBT pair, and when the load voltage is higher than the control voltage, the opto-coupler causes the IGBTs to become saturated and close, blocking the current. This allows the OSSRD1003A to be used for applications that require controlled on and off transitions.

The OSSRD1003A is a reliable solid state relay that is ideal for controlling current flows in AC and DC applications. With its built-in SPST switch, opto-coupler, and anti-parallel IGBT pair, it makes an excellent choice for controlling high powered loads with minimal heat dissipation.

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