GN325BSZ

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Solid State Relays (SSRs) refer to switching devices that use semiconductor components to complete the on and off switching of electrical circuits. SSRs are closely related to the field of industrial automation and control, and have been widely used in production processes. One of the solid state relays commonly used in industry is the GN325BSZ SSR.

The GN325BSZ SSR is a dynamic thyristor solid state relay, featuring a photovoltaic coupler, a Thevenin diode, and a thyristor as its core components. Its model number explains some of its essential features: GN325 indicates that the dynamic thyristor of this relay is a four-terminal type; B means operation voltage is 1500V, while S indicates minor trigger current of 5mA. Finally, Z stands for output time delay of ≤1ms, which is important for users’ applications.

The GN325BSZ’s application field mainly covers control circuits with intermediate events, or with speed regulating requirement. The GN325BSZ is thus suitable for motor control, industrial curing oven control, electric furnace temperature control and other occasions with short-time switching or control, while its fast on-off speed makes it an ideal choice for processes with high surface quality requirements. Moreover, this type of SSR relays can be used together with a variety of sensors, such as infrared sensors, magnetic inductive sensors, and pressure sensors, and has been widely used in a variety of fields.

The installation and use of GN325BSZ should follow certain rules and precautions. Firstly, it should be mounted on a solid metal heat sink, although the heat dissipation layer of the GN325BSZ is quite thick. Secondly, due to the presence of a positive temperature coefficient, a larger heatsink is required when larger load currents are expected. Thirdly, because of the high EMI/ EMC interference resistance, a small-size damping network circuit should be added when installed in the high-frequency switching system. Finally, the wiring of GN325BSZ SSR should be properly grounded by removing grounding isolator devices.

The working principle of GN325BSZ SSR involves the interaction between the photosensitive coupler and the main thyristor. When the incident light intensity of the photosensitive coupler exceeds the threshold, its conduction resistance would decrease greatly, allowing the non-latched thyristor to be trigged and switch to the “ON” state. The latching function of GN325BSZ will be preserved during the period of power-off. As a result, various functions can be designed in the electrical system.

In conclusion, the GN325BSZ is a 4-terminal dynamic thyristor solid state relay, and is classified as one of the many kinds of solid state relays which are extensively used in the field of industrial automation and control. It is suitable for control circuits with intermediate events and high speed regulating requirements, and carries all the advantages of other solid state relays, such as fast on-off speed, anti-electromagnetic interference, and compact size.

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