When a control circuit stops responding, the repair path usually splits two ways: replace the mechanical limit switch that opens or closes the circuit, or swap the PCB that drives the relay. This head-to-head covers both options. If you need a complete snap action limit switch, the Square D 9007-CO3 is the straightforward candidate. If you need the exact AMS 4419 Rev G relay PCB, the AMS board is the targeted spare, but it comes with a significant condition caveat.
Quick Verdict
Choose the Square D 9007-CO3 when you want a complete limit switch. Choose the AMS 4419 Rev G PCB only when your repair specifically calls for that board and you are comfortable treating it as a repair part.
Comparison at a Glance
| Product | Listed Price | Application | Condition | Key Details |
|---|---|---|---|---|
| AMS 4419 Rev G PCB (CN8-A 82350 V1.06) | $79.00 | Industrial | For parts or not working | Used, untested; sold AS-IS |
| Square D 9007-CO3 Limit Switch | $52.89 | Commercial | New - Open box | 10 A, 600 VAC; DPDT-DB Form ZZ; AWG 22-14 |
Where Each Product Wins
Choose the AMS 4419 Rev G PCB if you need a relay board with the CN8-A 82350 V1.06 identifiers.
Choose the Square D 9007-CO3 if you need a snap action limit switch with a 10 A current rating at 600 VAC, a DPDT-DB Form ZZ contact configuration, and an AWG 22 to AWG 14 wire range.
Product Notes
AMS 4419 Rev G Industrial Control Relay PCB CN8-A 82350 V1.06
The reason to look at this board is identification: it is sold as the AMS 4419 Rev G relay PCB with CN8-A 82350 V1.06 markings. That makes it a targeted spare for someone servicing that specific relay assembly. The limitation is just as clear: the board is for parts or not working, and it is sold used, untested, and AS-IS for parts or repair. It may show cosmetic signs of previous use such as dust, scratches, labels, or wiring, and there is no guarantee of functionality or compatibility. This is a repair project, not a plug-in solution. If your repair needs that exact board and you can handle the uncertainty of an untested PCB, it fits. If not, this option carries too much risk.
Square D 9007-CO3 Industrial Basic Snap Action Limit Switch 10A 600VAC
The Square D 9007-CO3 is a complete snap action limit switch sold as new open box rather than used or untested, which makes it the more straightforward candidate of the two. It carries the Square D brand and is intended for commercial applications. The limitation is that it is a limit switch, not a relay or contactor, and its coil voltage is listed as Not Applicable. If your circuit needs coil-driven switching rather than a mechanical snap action limit switch, this part will not provide that function. Use the listed contact arrangement as the final check against your circuit before buying.
Final Choice by Use Case
For a commercial limit switch replacement, the Square D 9007-CO3 is the pick.
For a repair matching the AMS 4419 Rev G relay PCB with CN8-A 82350 V1.06, the AMS board is the matching spare.
