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Solid State Relays

A solid state relay (SSR) is an electronic switching device that utilizes low voltage control signals to activate and deactivate a much higher voltage output. It is widely used in automation and distributed control systems because of their advantages over electromechanical relays. The solid state relays have no arcing or spark, virtually no mechanical wear and tear, fast switching times, and a long service life. One of the most popular and well-known of these SSRs is the ASSR-1420-002E.

ASSR-1420-002E Application Field and Working Principle

The ASSR-1420-002E relay is designed to switch higher voltages (up to 90V AC - 400V DC) and higher current (2-14A). It is typically used in applications such as lighting, motor control, HVAC, and energy management. It can also be used in industrial and home security control systems, as well as other applications requiring a high-power switch such as electric heating elements. The ASSR-1420-002E is a zero voltage turn off (ZVTO) relay, meaning that it will turn off when there is no voltage supply.

The ASSR-1420-002E works by utilizing a switching solid state element such as an IGBT, MOSFET, or TRIAC to control the input current to the connected load. In the OFF state, the solid state element is open, so no current flows through the load and output voltage is zero. When an input signal is applied, the solid state element switches ON, allowing current to flow through the load, and thus activating the output voltage.

The most crucial characteristics of the ASSR-1420-002E are its features associated with the input side of the system. These features include input current level control (current limiting), noise immunity (such as filtered noise, low pass filtering, etc.), and surge protection. The most important features of the output side of the system are overload protection and short circuit protection.

The ASSR-1420-002E also includes a number of features to ensure optimal performance. These include a temperature-sensing system to ensure that the system does not overheat due to prolonged usage, a protection system that can detect current surge and activate a shut-off switch to prevent damage, and a protection system that can detect reverse voltage and accordingly reverse the flow of the current.

The ASSR-1420-002E relay is a popular choice for many electronic control applications due to its high voltage and current ratings, fast response time, long service life, and its immunity to damage from overvoltage and overcurrent. It is a reliable, durable, and cost-effective solution for many industrial and home automation applications.

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