ORB120A25 - ORB Series

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Littelfuse Time Delay Relays
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The ORB 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 (Delay-on-Break)
Input voltage must be applied before and during timing. Upon closure of the initiate switch, the output relay energizes. The time delay begins when the initiate switch is opened (trailing edge triggered). The output remains energized during timing. At the end of the time delay, the output de-energizes. The output will energize if the initiate switch is closed when input voltage is applied.
Reset: Reclosing the initiate switch during timing resets the time delay. Loss of input voltage resets the time delay and output.

Property (Mouseover for details) Value
Input Voltage (V) 120VAC
Input Tolerance (%) -20% - 10%
Input AC Line Frequency (Hz) 50/60Hz
Output Type Electromechanical relay
Output Form Isolated SPDT or DPDT
Output Load Rating (VA) 10A resistive @ 120/240VAC and 28VDC; 1/3hp @ 120/240VAC
Time Delay Type Analog circuitry
Time Delay Range 3 - 300s onboard adjustable
Time Delay Tolerance (%) Guaranteed range
Reset Time (ms) ≤50ms
Initiate Time (ms) ≤70ms
Repeat Accuracy (%) ±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 105
Power Consumption 2.25W
Termination Type 0.25 in. (6.35mm) male quick connect terminals
Mounting Method Surface mount with four #6 (M3.5 x 0.6) screw
Operating Temperature -20° to 65°C (-4°F to 149°F)
Storage Temperature (F/C) -30° to 85°C (-22°F to 185°F)
Weight (lbs/g) ≅2.7oz (77g)
Sample capable No