| 551 | 621-3650 | Honeywell | Honeywell 621-3650 48V DC Sink Input | instock |
| 552 | 621-4300 | Honeywell | Honeywell 621-4300 5V DC Input | instock |
| 553 | 621-4350 | Honeywell | Honeywell 621-4350 5V DC TTL Input | instock |
| 554 | 621-4500 | Honeywell | Honeywell 621-4500 12-24V DC Source Input | instock |
| 555 | 621-4502 | Honeywell | Honeywell 621-4502 12-24V DC SIM Fast Response | instock |
| 556 | 621-4550 | Honeywell | Honeywell 621-4550 24V DC Source Input Module | instock |
| 557 | 621-6300 | Honeywell | Honeywell 621-6300 5V DC Source Input | instock |
| 558 | 621-6350 | Honeywell | Honeywell 621-6350 5V DC Source Input | instock |
| 559 | 621-6450 | Honeywell | Honeywell 621-6450 12V DC SRD Output Module 2A | instock |
| 560 | 621-6500 | Honeywell | Honeywell 621-6500 12-24 V DC Source | instock |
| 561 | 621-6501 | Honeywell | Honeywell 621-6501 12-24 V DC Source Self Protector | instock |
| 562 | 621-6502 | Honeywell | Honeywell 621-6502 | instock |
| 563 | 621-6503 | Honeywell | Honeywell 621-6503 8 Point 24V DC Self Protector Outpu | instock |
| 564 | 621-6550 | Honeywell | Honeywell 621-6550 621-6550 | Digital Output Module | instock |
| 565 | 621-6550R | Honeywell | Honeywell 621-6550R | instock |
| 566 | 621-6550RC | Honeywell | Honeywell 621-6550RC | instock |
| 567 | 621-6551 | Honeywell | Honeywell 621-6551 24V DC Source Output 0.5A | instock |
| 568 | 621-6551R | Honeywell | Honeywell 621-6551R | instock |
| 569 | 621-6552 | Honeywell | Honeywell 621-6552 16 Point 24 V DC Output DIV POT | instock |
| 570 | 621-6552R | Honeywell | Honeywell 621-6552R | instock |
| 571 | 621-6575 | Honeywell | Honeywell 621-6575 Honeywell, 621 Series, Output Module, 32 Output, 24 V dc | instock |
| 572 | 621-6575R | Honeywell | Honeywell 621-6575R | instock |
| 573 | 621-6575RC | Honeywell | Honeywell 621-6575RC | instock |
| 574 | 621-6576 | Honeywell | Honeywell 621-6576 Honeywell 32 Channel 24VDC Output Module | instock |
| 575 | 621-6576R | Honeywell | Honeywell 621-6576R | instock |
