The optocouplers form an additional layer of isolation between the load being switched and the inputs. The indicator LEDs glow when the coil of the respective relay is energized, indicating that the relay is active. The freewheeling diodes prevent voltage spikes across the transistors when the relay is turned off since the coils are an inductive load. They amplify the input signal so that they can drive the coils to activate the relays. The switching transistors act as a buffer between the relay coils that require high currents, and the inputs which don’t draw much current. The contacts on each relay are specified for 250VAC and 30VDC and 10A in each case, as marked on the body of the relays.
The four relays on the module are rated for 5V, which means the relay is activated when there is approximately 5V across the coil. The terminals are screw type, which makes connections to mains wiring easy and changeable. There are two terminal blocks with six terminals each, and each block is shared by two relays. The four-channel relay module contains four 5V relays and the associated switching and isolating components, which makes interfacing with a microcontroller or sensor easy with minimum components and connections. Understanding 5V Four-Channel Relay Module Single-channel relay module, dual-channel relay module, eight-channel relay module. Relay maximum contact voltage – 250VAC, 30VDC.Current when the relay is active - ~70mA (single), ~300mA (all four).The four-channel relay module contains four 5V relays and the associated switching and isolating components, which makes interfacing with a microcontroller or sensor easy with minimum components and connections. The contacts on each relay are specified for 250VAC and 30VDC and 10A in each case, as marked on the body of the relays.Ĭomponents Present on A Four-Channel Relay Moduleįollowing are the major components present on the four-channel relay module, we will get into the details of this later in the article.ĥV relay, terminal blocks, male headers, transistors, optocouplers, diodes, and LEDs.
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