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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 | KSDS621 |
| Description | TDR; 1...100 s; Ext RT Adj; 230V AC; 1A SPST-NO; Single Shot; QC 0.250" |
| Datasheet | Download Datasheet |
The Littelfuse SSAC KSDS621 is a solid-state single shot timer module for 230 V AC, with a 1 A solid-state output (10 A inrush). Its delay is adjustable from 1 to 100 seconds with an external resistor across its RT terminals.
Input voltage must be applied before and during timing. A momentary or maintained closure of the initiate switch (leading-edge triggered) energizes the output for the set time; opening or reclosing the switch during timing has no effect. The output will not energize if the switch is closed when input voltage is applied. It resets when the delay is complete and the switch is open; loss of input voltage resets the delay and the output. For dispensing, exposure timing and pulse shaping.
Output: 1A SPST-NO. Voltage drop about 2.5 V at full load. Repeat accuracy: ±0.5%. Setting accuracy: Factory calibration ±10%; ±10% over temperature and voltage. Reset time: 150 ms. Supply tolerance: ±20% of nominal; 50/60 Hz.
It is surface mounted and has 0.250 in (6.3 mm) male quick-connect terminals. It operates from -40 to +60 °C and stores from -40 to +85 °C.
| Category | |
| Manufacturer | SSAC / Littelfuse |
| Model | KSDS |
| Output Technology | Solid State |
| Timing Function | Single Shot |
| Delay Time | 1...100 s |
| Timing Adjustment Method | External resistor (RT terminals) |
| Timing Initiate Method | Control Switch |
| Contact Configuration | 1A SPST-NO |
| Load Current (A) | 1 |
| Input Voltage | 230V AC |
| Termination Style | Quick Connect - 0.250" (6.3mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40...+60 °C (-40...+85 °C) |
| Setting Accuracy (%) | Factory calibration ±10%; ±10% over temperature and voltage |
| Repeatability (%) | ±0.5% |
| Recovery Time (ms) | 150 |
| Maximum Peak Current (A) | 10 |
| Input Operating Range | ±20% of nominal; 50/60 Hz |
| On-State Voltage Drop (V) | 2.5 |