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Series: SIR

Littelfuse SIR Relays Provide Exceptional Solid-State Switching Protection

Product Status| Activei

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.

Entirely solid-state and encapsulated
Entirely solid-state and encapsulated
Switching output is optically isolated from the control input
SIR1 models – random switching
SIR2 models – zero voltage switching
Metalized mounting surface
Metalized mounting surface

No moving parts to arc and wear out over time Protects against shock, vibration, and humidity
Provides direct control of heavy inductive, incandescent, or resistive loads
Provides the ability to interface between 2 different electrical circuits
Ideal for inductive loads
Ideal for resistive and incandescent loads
Facilitates heat transfer in high-current applications
Facilitates heat transfer in high current applications

SIR Parts

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	Part Number	Actions	Input Voltage (V)	Output Voltage (V)	Output Form	Termination Type	Mount Method	Dimensions	Weight (kg)	Dielectric Breakdown	Humidity	Input Tolerance (%)	Input Type	Insulation Resistance (Ω)	OFF Open State Leakage Current	Minimum Output Load Current (A)	Output Load Rating (VA)	Output Type	Output Voltage Drop (V)	Power Consumption	Storage temperature (°C)

Part Number	Actions	Input Voltage (V)	Output Voltage (V)	Output Form	Termination Type	Dimensions	Weight (kg)	Dielectric Breakdown	Humidity	Input Tolerance (%)	Input Type	Insulation Resistance (Ω)	OFF Open State Leakage Current	Minimum Output Load Current (A)	Output Load Rating (VA)	Output Type	Output Voltage Drop (V)	Power Consumption
Series: SIR - Littelfuse SIR Relays Provide Exceptional Solid-State Switching Protection Series: SIR Littelfuse SIR Relays Provide Exceptional Solid-State Switching Protection	Datasheet Request Sample View More	90 - 150 Vac/Vdc	120 Vac	SPST NC	0.25 in. (6.3 mm) male quick connect terminals	2 H x 2 W x 1.51 D in. (50.8 x 50.8 x 38.4 mm)	0 Kg (kilogram)	≥2000 terminals to mounting surface	95% non-condensing	±20%	Optical isolation LED/photo transistor	≥100	≅6	≅50	6 A	Optical isolation totally Solid state	≅2.0 at rated current	≤0.5 W
Series: SIR - Littelfuse SIR Relays Provide Exceptional Solid-State Switching Protection Series: SIR Littelfuse SIR Relays Provide Exceptional Solid-State Switching Protection	Datasheet Request Sample View More	9 - 30 Vac/Vdc	120 Vac	SPST; NO	0.25 in. (6.3 mm) male quick connect terminals	2 H x 2 W x 1.51 D in. (50.8 x 50.8 x 38.4 mm)	0 Kg (kilogram)	≥2000 terminals to mounting surface	95% non-condensing	±20%	Optical isolation LED/photo transistor	≥100	≅6	≅50	20 A	Optical isolation totally Solid state	≅2.0 at rated current	≤0.5 W
Series: SIR - Littelfuse SIR Relays Provide Exceptional Solid-State Switching Protection Series: SIR Littelfuse SIR Relays Provide Exceptional Solid-State Switching Protection	Datasheet Request Sample View More	90 - 150 Vac/Vdc	120 Vac	SPST; NO	0.25 in. (6.3 mm) male quick connect terminals	2 H x 2 W x 1.51 D in. (50.8 x 50.8 x 38.4 mm)	0 Kg (kilogram)	≥2000 terminals to mounting surface	95% non-condensing	±20%	Optical isolation LED/photo transistor	≥100	≅6	≅50	20 A	Optical isolation totally Solid state	≅2.0 at rated current	≤0.5 W
Series: SIR - Littelfuse SIR Relays Provide Exceptional Solid-State Switching Protection Series: SIR Littelfuse SIR Relays Provide Exceptional Solid-State Switching Protection	Datasheet Request Sample View More	90 - 150 Vac/Vdc	120 Vac	SPST NC	0.25 in. (6.3 mm) male quick connect terminals	2 H x 2 W x 1.51 D in. (50.8 x 50.8 x 38.4 mm)	0 Kg (kilogram)	≥2000 terminals to mounting surface	95% non-condensing	±20%	Optical isolation LED/photo transistor	≥100	≅6	≅50	20 A	Optical isolation totally Solid state	≅2.0 at rated current	≤0.5 W