SIR Series - Littelfuse SIR Relays Provide Exceptional Solid-State Switching Protection

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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The solid-state SIR Series Relays are designed for industrial applications requiring rugged, reliable operation. These relays provide an optically-isolated, high-capacity, solid-state output with power switching capability up to 20 A steady state, 200 A inrush. The SIR2 zero voltage switching is intended for resistive and incandescent loads and can extend the life of an incandescent lamp up to 10 times. The SIR1 random switching is intended 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 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 can also be reset if the output voltage is removed.

Features

  • Inductive, resistive, and incandescent loads
  • Industrial systems requiring rugged, reliable operation

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)
Output VoltageOutput
Form
Termination TypeMounting MethodDimensionsWeight (lbs/g)CircuitryDielectric BreakdownHumidityInput Tolerance (%)Input TypeInsulation ResistanceOpen State Leakage Current (A)Minimum Output Load Current (A)StockSamplesCompare
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)Encapsulated≥2000V RMS terminals to mounting surface95% relative non-condensing±20%Optical isolation LED/photo transistor≥100 MΩ≅50mA
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)Encapsulated≥2000V RMS terminals to mounting surface95% relative non-condensing±20%Optical isolation LED/photo transistor≥100 MΩ≅50mA
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)Encapsulated≥2000V RMS terminals to mounting surface95% relative non-condensing±20%Optical isolation LED/photo transistor≥100 MΩ≅50mA
SIR1B6B490 - 150 Vac/Vdc120 VacSPST NC0.25 in. (6.3 mm) male quick connect terminalsSurface mount with one #10 (M5 x 0.8) screw2 H x 2 W x 1.51 D in. (50.8 x 50.8 x 38.4 mm)0 Kg≥2000 terminals to mounting surface95% non-condensing±20%Optical isolation LED/photo transistor≥100≅6≅50CheckOrder
SIR2A20A49 - 30 Vac/Vdc120 VacSPST; NO0.25 in. (6.3 mm) male quick connect terminalsSurface mount with one #10 (M5 x 0.8) screw2 H x 2 W x 1.51 D in. (50.8 x 50.8 x 38.4 mm)0 Kg≥2000 terminals to mounting surface95% non-condensing±20%Optical isolation LED/photo transistor≥100≅6≅50CheckOrder
SIR2B20A490 - 150 Vac/Vdc120 VacSPST; NO0.25 in. (6.3 mm) male quick connect terminalsSurface mount with one #10 (M5 x 0.8) screw2 H x 2 W x 1.51 D in. (50.8 x 50.8 x 38.4 mm)0 Kg≥2000 terminals to mounting surface95% non-condensing±20%Optical isolation LED/photo transistor≥100≅6≅50CheckOrder
SIR2B20B490 - 150 Vac/Vdc120 VacSPST NC0.25 in. (6.3 mm) male quick connect terminalsSurface mount with one #10 (M5 x 0.8) screw2 H x 2 W x 1.51 D in. (50.8 x 50.8 x 38.4 mm)0 Kg≥2000 terminals to mounting surface95% non-condensing±20%Optical isolation LED/photo transistor≥100≅6≅50CheckOrder
SIR1C20B6
Obsolete: 2020 -09-21
190 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)Encapsulated≥2000V RMS terminals to mounting surface95% relative non-condensing±20%Optical isolation LED/photo transistor≥100 MΩ≅50mA
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