SIR Series - Solid State Isolated Relay

Littelfuse Single Function Relays
Designed for industrial applications requiring rugged reliable operation. Provides an optically isolated, high capacity, solidstate output, with power switching capability up to 20A steady state, 200A inrush. Zero voltage switching SIR2 extends the life of an incandescent lamp up to 10 times. Random switching SIR1 is ideal for inductive loads. When fully insulated female terminals are used on the connection wires, the system meets the requirements for touch-proof connections.


Operation
The solid-state output is located between terminals 1 and 3, and is normally open or normally closed without control voltage applied to terminals 4 and 5. When control voltage is applied to terminals 4 and 5, the solid-state output opens or closes respectively.
Reset: Removing control voltage resets the output. The unit is also reset if output voltage is removed.

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)
Output VoltageOutput
Form
Termination TypeMounting MethodDimensionsWeight (lbs/g)Compare
SIR1A1A49 to 30VAC/DC120VACSPST NO0.25 in. (6.35mm) male quick connect terminalsSurface mount with one #10 (M5 x 0.8) screw2.00 x 2.00 x 1.51 in. (50.8 x 50.8 x 38.4mm)≅3.9oz (111g)
SIR1A20A49 to 30VAC/DC120VACSPST NO0.25 in. (6.35mm) male quick connect terminalsSurface mount with one #10 (M5 x 0.8) screw2.00 x 2.00 x 1.51 in. (50.8 x 50.8 x 38.4mm)≅3.9oz (111g)
SIR1B6A490 to 150VAC/DC120VACSPST NO0.25 in. (6.35mm) male quick connect terminalsSurface mount with one #10 (M5 x 0.8) screw2.00 x 2.00 x 1.51 in. (50.8 x 50.8 x 38.4mm)≅3.9oz (111g)
SIR1B6B490 to 150VAC/DC120VACSPST NC0.25 in. (6.35mm) male quick connect terminalsSurface mount with one #10 (M5 x 0.8) screw2.00 x 2.00 x 1.51 in. (50.8 x 50.8 x 38.4mm)≅3.9oz (111g)
SIR1C20B6190 to 290VAC/DC230VACSPST NC0.25 in. (6.35mm) male quick connect terminalsSurface mount with one #10 (M5 x 0.8) screw2.00 x 2.00 x 1.51 in. (50.8 x 50.8 x 38.4mm)≅3.9oz (111g)
SIR2A20A49 to 30VAC/DC120VACSPST NO0.25 in. (6.35mm) male quick connect terminalsSurface mount with one #10 (M5 x 0.8) screw2.00 x 2.00 x 1.51 in. (50.8 x 50.8 x 38.4mm)≅3.9oz (111g)
SIR2B20A490 to 150VAC/DC120VACSPST NO0.25 in. (6.35mm) male quick connect terminalsSurface mount with one #10 (M5 x 0.8) screw2.00 x 2.00 x 1.51 in. (50.8 x 50.8 x 38.4mm)≅3.9oz (111g)
SIR2B20B490 to 150VAC/DC120VACSPST NC0.25 in. (6.35mm) male quick connect terminalsSurface mount with one #10 (M5 x 0.8) screw2.00 x 2.00 x 1.51 in. (50.8 x 50.8 x 38.4mm)≅3.9oz (111g)