AQW225NAX

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Solid State Relays (SSRs) are electrical components that can accomplish the same basic functions as regular relays, but they do so by controlling an electrical load, such as a motor or a heater, using a solid-state circuit rather than a mechanical switching element. The AQW225NAX is a popular model of SSR manufactured by Omron Corporation and, as such, its application field and working principle are indicative of the technology in general.

In broad terms, Solid State Relays are most commonly used in automation and industrial control applications, due to their repeatability, durability and non-contact features. The AQW225NAX is no exception - its general application field is in contactless switching, protecting home appliances, self-protection and improved safety in industrial equipment. Further to this, the AQW225NAX can also be used to switch loads in circuits where contact bouncing and electrical noise have traditionally been an issue.

The AQW225NAX is a single-pole single-throw, bi-directional SSR, meaning that it switches an electrical load from zero volts to a logic-level of either 12 or 24 VDC. The switch of the AQW225NAX SSR is closed when the control signal is applied, which is either zero or, more commonly, 5 VDC at maximum 30 mA. The AQW225NAX is capable of switching up to 5 A, with an over-current rating of 6.25 A maximum, making it ideal for low-amperage applications. The SSR also features a built-in current overload protection circuit, which is designed to protect the units from faults and from external noise interference.

At a fundamental level, the AQW225NAX SSR operates using a two-stage system. Firstly, the electrical power is connected to the heater inside the SSR, which then converts an electrical current into a thermal current. This thermal current then activates a thermistor, generating heat and a magnetic field, which in turn closes the internal mechanical contact and opens the SSR. The current overload protection circuit is activated at the same time to prevent an over-current situation occurring.

The AQW225NAX SSR is designed to be a dynamic solution to switching electrical loads, particularly where contact bouncing and electrical noise are a potential problem. Its relatively high power rating and overload protection features, as well as its contactless switching capabilities, make it an ideal choice for a variety of automation and industrial control applications.

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