DRA3R40B4

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Solid State Relays

Solid state relays (SSRs) are electronic switches that use solid-state components instead of electromechanical elements to overcome the disadvantages of using mechanical relays – for example, noise, size, environmental sensitivity, and relatively high current and voltage. The DRA3R40B4 is one such SSR.

DRA3R40B4 Application Field and Working Principle

The DRA3R40B4 is a DC-controlled 40A AC output solid state relay with a zero switching voltage range of 3-32V, and it can be used to switch up to 40A in on/off control mode or 3~10A in phase-angle control mode. Suitable applications range from high precision circuits requiring zero current switching to inductive loads switching such as air conditioners, rice cookers, pumps, compressors, and other AC loads.

The main component of the DRA3R40B4 is a series of voltage switches and resistors. Inside, when the relay is in its off-state mode, the switches remain closed and form a direct connection with the output side with no current drawn. When voltage is applied to the control side, the switches open, breaking the connection between the control and output sides. This is known as an insulated or fire-tight state. Meanwhile, on the control side, the current is drawn into corresponding resistors that generate a signal for the control circuit, further reducing the input current.

In terms of installation, the DRA3R40B4 features an accurate force fit and requires no drilling or screwing. It is also CE, TUV certified, and vibration tested for enhanced durability when mounting on the panel. An excellent heat dissipation system using IC integrated technology also helps the SSR to withstand some temperature variations. Connection is easy too – just use the terminal block available for 0.5–2.5 mm² wire or the female spade connector if needed.

Overall, the DRA3R40B4 is an ideal Solid State Relay for applications where precision, dependability, and ease of use are desired. It could be the solution to the complex problems of switching multiple types of AC loads, and is a suitable solution for both industrial and consumer electronics.

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