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To ensure accuracy, please note that images may be representative. Refer to the product data sheet for detailed specifications.
| Manufacturer | SSAC / Littelfuse |
| Manufacturer Product Number | HRD9323 |
| Description | TDR; 0.1...10 min; Knob Adj; 24V DC; 1A SPST-NO; Retriggerable Single Shot |
| Datasheet | Download Datasheet |
The Littelfuse SSAC HRD9323 is a retriggerable single shot timer for 24 V DC, with isolated SPST-NO relay contacts rated 15 A (UL) / 30 A (CSA) general purpose at 125 V AC. Its delay is adjustable from 0.1 to 10 minutes with its onboard knob.
A retriggerable single shot (motion detector): with input voltage applied, closing the initiate switch energizes the output and starts the delay; at the end of it the output de-energizes. Reclosing the switch during or after timing resets the delay and restarts timing. Powering up with the switch closed does not energize the output.
Output: 1A SPST-NO relay, 15 A (UL) / 30 A (CSA) general purpose at 125 V AC; 10 A at 240 V AC; 20 A resistive at 30 V DC; 1 hp at 125/240 V AC (isolated contacts). Repeat accuracy: ±0.5% or 20 ms, whichever is greater. Setting accuracy: Factory calibration ±10%; ±2% over temperature and voltage. Reset time: 75 ms. Supply tolerance: -15% / +20% of nominal. Power: 2 W. Life: 1,000,000 operations mechanical.
It is surface mounted and has 0.250 in (6.3 mm) male quick-connect terminals. It operates from -20 to +60 °C and stores from -40 to +85 °C.
| Category | |
| Manufacturer | SSAC / Littelfuse |
| Model | HRD9 |
| Output Technology | Electromechanical Relay |
| Timing Function | Retriggerable Single Shot |
| Delay Time | 0.1...10 min |
| Timing Adjustment Method | Onboard knob |
| Timing Initiate Method | Control Switch |
| Contact Configuration | 1A SPST-NO |
| Output Rating | 15 A (UL) / 30 A (CSA) general purpose at 125 V AC; 10 A at 240 V AC; 20 A resistive at 30 V DC; 1 hp at 125/240 V AC (isolated contacts) |
| Input Voltage | 24V DC |
| Termination Style | Quick Connect - 0.250" (6.3mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -20...+60 °C (-40...+85 °C) |
| Setting Accuracy (%) | Factory calibration ±10%; ±2% over temperature and voltage |
| Repeatability (%) | ±0.5% or 20 ms, whichever is greater |
| Recovery Time (ms) | 75 |
| Mechanical Life (cycles) | 1,000,000 |
| Input Operating Range | -15% / +20% of nominal |
| Rated Power | 2 W |