4 variants · Littelfuse
The Littelfuse Littelfuse HRDS Series series groups 4 related part numbers, each listed with full specifications, a datasheet where available, and an RFQ option. The listed variants share a common mounting of Chassis Mount, package of Bulk and timing adjustment method of Screwdriver Slot. Variants differ by delay time and supply voltage, so you can match the exact delay time your application requires using the selection guide below.
| Parameter | HRDS421 | HRDS120 | HRDS321 |
|---|---|---|---|
| Delay time | 1 Sec to 100 Sec | 0.1 Sec to 10 Sec | 1 Sec to 100 Sec |
| Supply voltage | 120 VAC | 12 VDC | 24 VDC |
Request a quote on any Littelfuse HRDS Series part number and we confirm price, availability and lead time per line — including end-of-life and allocation-constrained variants.
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