SOLID STATE RELAY AND LOAD DRIVE CIRCUIT

摘要

PROBLEM TO BE SOLVED: To appropriately prevent other electronic components from burning whichever of a snubber circuit and a control circuit is damaged in a simple and inexpensive configuration.

SOLUTION: A solid state relay includes: a light receiving element 10 for photoelectrically converting light from a light emitting element 9 connected between input terminals; output terminals 6 connected with an AC power supply 3 and a load 4; a first connection line 11 connecting one end of the light receiving element 10 to one of the output terminals 6; a second connection line 12 connecting the other end of the light receiving element 10 to the other of the output terminals 6; a switching element 13 connected between the first connection line 11 and the second connection line 12 and configured to become conductive on the basis of an output from the light receiving element 10; and a snubber circuit 14 comprising a series connection of a capacitor and a resistance. The resistance of the snubber circuit 14 is connected in the first connection line 11 between the one end of the light receiving element 10 and one end of the switching element 13, and an overcurrent protection element 21 is connected between the resistance and the one end of the switching element 13.

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