ORS120A150SD - ORS Series

Series: ORS
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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 ORS Series’ open PCB construction offers the user good economy without sacrificing performance and reliability. The output relay is available in isolated, 10A, DPDT or SPDT forms. The time delay may be ordered as factory fixed, onboard knob, or external adjustment. All connections are 0.25 in. (6.35 mm) male quick connect terminals.


Operation (Single Shot)
Input voltage must be applied before and during timing. Upon momentary or maintained closure of the initiate switch (leading edge triggered), the output relay energizes for a measured interval of time. At the end of the time delay, the output de-energizes. Opening or reclosing the initiate switch during timing has no affect on the time delay. The output will energize if the initiate switch is closed when input voltage is applied.
Reset: Reset occurs when the time delay is complete and the initiate switch is opened. Loss of input voltage resets the time delay and output.

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Product Literature

For Technical Questions

Call +1 800-832-3873 or email us at relays@littelfuse.com 

Property (Mouseover for details) Value
Input Voltage (V) 120 A
Input Tolerance (%) -20% - 10%
Input AC Line Frequency (Hz) 50/60
Output Type Electromechanical relay
Output Form Isolated DPDT
Output Load Rating (VA) 10 A resistive @ 120/240 V ac and 28 V dc; 1/3 hp @ 230 V ac
Time Delay Type Analog
Time Delay Range 50 s fixed
Time Delay Tolerance (%) ±10%
Reset Time (ms) ≤50
Initiate Time (ms) ≤70
Repeat Accuracy (%) ±0.2% or 20 ms whichever is greater
Setpoint vs Ambient Temperature and Operating Voltage (%) ≤±10%
Life Electrical: 1 x 10⁶; Mechanical: 1 x 10⁷
Power Consumption 2.25 W
Termination Type 0.25 in. (6.35 mm) male quick connect terminals
Mounting Method Surface mount with 1 #10 (M5 x 0.8) screw
Operating Temperature -20° to 65°C (-4° to 149°F)
Weight (lbs/g) 0 Kg

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