ORB Series - Delay On Break Timer

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.

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)
Storage Temperature (F/C)Time Delay RangeSample CapableCompare
ORB120A160120VACIsolated SPDT or DPDT-30° to 85°C (-22°F to 185°F)60s fixedNo
ORB120A25120VACIsolated SPDT or DPDT-30° to 85°C (-22°F to 185°F)3 - 300s onboard adjustableNo
ORB24A11D24VACIsolated SPDT or DPDT-30° to 85°C (-22°F to 185°F)1s fixedNo
ORB24A21D24VACIsolated SPDT or DPDT-30° to 85°C (-22°F to 185°F)0.05 - 3s onboard adjustableNo
ORB24A2524VACIsolated SPDT or DPDT-30° to 85°C (-22°F to 185°F)3 - 300s onboard adjustableNo