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EK025 is an electronic switch for AC loads, built around an opto-triac and a power triac. When a voltage above 1.25V is presented at the input (P1), the IR-LED inside U1 is lit and the triac conducts, which in turn will open the power triac. The opto-triac can not control a heavy load on its own and is only used to provide galvanic isolation between the low- and high voltage parts of the circuit. A snubber circuit (C1+R4) enables control of motors and other inductive loads. A MOV (metal oxide varistor) will catch transients that can occur when a load is switched off and protect the rest of the circuit.
* Control voltage: 1.25 – 5.5 VDC (12V: R1 = 470ohm, 24V: R1 = 1kohm) * Control current (@3.3V): 10mA (max 50mA) * Max voltage (load): 230VAC * Max current (load): 3A (without extra heatsink) * Dimensions: 40.64 x 30.48mm * Mounting holes: c-c 35.56 x 25.4mm, ø2.54mm
!!OBSERVE!! 230VAC mains voltage is present in this circuit! Please take necessary caution to prevent electric shock!