ORS120A150SD - ORS Series

Series: ORS Questions? Contact Littelfuse Support
Littelfuse Single Shot Relays
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.

Property (Mouseover for details) Value
Input Voltage (V) 120A
Input Tolerance (%) -20% - 10%
Input AC Line Frequency (Hz) 50/60Hz
Output Type Electromechanical relay
Output Form DPDT isolated
Output Load Rating (VA) 10A resistive @ 120/240VAC and 28VDC; 1/3hp @ 230VAC
Time Delay Type Analog circuitry
Time Delay Range 50s fixed
Time Delay Tolerance (%) ±10%
Reset Time (ms) ≤50ms
Initiate Time (ms) ≤70ms
Repeat Accuracy (%) ±0.2% or 20ms whichever is greater
Setpoint vs Ambient Temperature and Operating Voltage (%) ≤ ±10%
Isolation Voltage (V) ≥1500V RMS input to output
Life Mechanical - 1 x 107; Electrical - 1 x 106
Power Consumption 2.25W
Termination Type 0.25 in. (6.35mm) male quick connect terminals
Mounting Method Surface mount with one #10 (M5 x 0.8) screw
Operating Temperature -20° to 65°C (-4°F to 149°F)
Weight (lbs/g) ≅2.7oz (77g)
Sample capable No