| PartNumber | ESDR420A0 | ESDR421A4 | ESDR420A1 |
| Description | Time Delay & Timing Relays SOLIDSTATETIMERRECY CLING | Time Delay & Timing Relays SOLIDSTATETIMERRECY CLING | Time Delay & Timing Relays SOLIDSTATETIMERRECY CLING |
| 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 | 2 Form C (DPDT-NO, NC) | 2 Form C (DPDT-NO, NC) | 2 Form C (DPDT-NO, NC) |
| Operating Supply Voltage | 120 VAC | 120 VAC | 120 VAC |
| Timing Range | 0.1 s to 1000 m | 0.1 s to 1000 m | 0.1 s to 1000 m |
| Contact Rating | 1 A | 1 A | 1 A |
| Series | ESDR | ESDR | ESDR |
| Packaging | Bulk | Bulk | Bulk |
| Contact Form | DPDT (2 Form C) | DPDT (2 Form C) | DPDT (2 Form C) |
| Brand | Littelfuse | Littelfuse | Littelfuse |
| Product Type | Timing Relays | Timing Relays | Timing Relays |
| Factory Pack Quantity | 1 | 1 | 1 |
| Subcategory | Relays | Relays | Relays |
| Unit Weight | 2.399998 oz | 2.399998 oz | 2.399998 oz |