| PartNumber | HRDR321A4R | HRDR121A4R | HRDR322B2R |
| Description | Time Delay & Timing Relays RECYCLINGTIMER | Time Delay & Timing Relays RECYCLINGTIMER | Time Delay & Timing Relays RECYCLINGTIMER |
| Manufacturer | Littelfuse | Littelfuse | Littelfuse |
| Product Category | Time Delay & Timing Relays | Time Delay & Timing Relays | Time Delay & Timing Relays |
| RoHS | Y | Y | Y |
| Termination Style | Quick Connect Terminal | Quick Connect Terminal | Quick Connect Terminal |
| Relay Contact Form | 1 Form C (SPDT-NO, NC) | 1 Form C (SPDT-NO, NC) | 1 Form C (SPDT-NO, NC) |
| Operating Supply Voltage | 24 VDC | - | - |
| Timing Range | 1 s to 100 s | 1 s to 100 s | 10 s to 1000 s |
| Contact Rating | 30 A | - | - |
| Series | HRDR | HRDR | HRDR |
| Packaging | Bulk | Bulk | Bulk |
| Contact Form | SPDT (1 Form C) | SPDT (1 Form C) | SPDT (1 Form C) |
| Brand | Littelfuse | Littelfuse | Littelfuse |
| Product Type | Timing Relays | Timing Relays | Timing Relays |
| Factory Pack Quantity | 1 | 1 | 1 |
| Subcategory | Relays | Relays | Relays |
| Display Type | - | Analog Dial | Analog Dial |