Quick Take
Choosing a relay or industrial switch comes down to the same trade-off: you want a component that matches your control voltage, current path, and panel layout, without paying for more than you need. The four listings here cover a used Square D control relay, an untested AMS relay PCB sold for parts or repair, an open-box multi-relay PCB board, and a spare SSR-40DA relay. The Square D has the most complete electrical description, while the 0907 PB board offers the most relay ports. The AMS board is the highest-risk pick.
Listed Price Comparison
| Listing | Listed Price | Price Bar | Standout Detail |
|---|---|---|---|
| AMS 4419 Rev G Industrial Control Relay PCB CN8-A 82350 V1.06 | USD 79.00 | Untested relay PCB | |
| SQUARE D 8501 X080 Industrial Control Relay 8NC 12P 10A Total 120/110V Coil | USD 27.99 | Used relay with detailed part ratings | |
| 0907 PB 12-RELAY INDUSTRIAL PCB BOARD | USD 350.00 | Open-box industrial PCB board | |
| INDUSTRIAL SPARE SSR-40DA RELAY 24/480V NSNP | USD 8.00 | Least expensive listing here |
Decision Matrix
| If You Need | Choose This | Why |
|---|---|---|
| A used relay with named part numbers and NEMA-style ratings | SQUARE D 8501 X080 | 8-pole base expandable to 12 poles; 10 A thermal current; described as thoroughly tested and fully functional |
| A relay PCB for parts, repair, or donor use | AMS 4419 Rev G | Dedicated relay PCB; explicitly sold as for parts or not working |
| A board with many relay connections for automation | 0907 PB 12-RELAY INDUSTRIAL PCB BOARD | Industrial automation and control work |
| An inexpensive SSR-type spare | INDUSTRIAL SPARE SSR-40DA RELAY 24/480V NSNP | SSR-40DA designation; new open-box condition |
Product Notes
#### AMS 4419 Rev G Industrial Control Relay PCB CN8-A 82350 V1.06
This AMS 4419 Rev G relay PCB is listed as an industrial relay board, but the condition tag is the most important detail: it is for parts or not working. The description says the board has not been powered on or functionally tested, and it may show dust, scratches, labels, or signs of prior use. That makes it a candidate for component harvesting or for an engineer who wants to troubleshoot the board itself. The USD 79.00 price sits between the low-priced SSR and the multi-relay board, so it is not a low-cost throwaway. Choose it only if you can accept untested electronics and can work around cosmetic defects.
#### SQUARE D 8501 X080 Industrial Control Relay 8NC 12P 10A Total 120/110V Coil
The Square D 8501 X080 gives you a concrete catalog number and a heavy-duty NEMA control relay package. The listing describes it as used but thoroughly tested and fully functional, with only minor cosmetic wear. The base accepts 8 poles and expands to 12, and the thermal current rating is 10 A. That level of electrical detail is what makes the USD 27.99 price reasonable for someone replacing a failed relay in a panel. Just know the condition is used, so you should expect some scuffs or handling marks. If the exact contact configuration matters, the listing does state 8 normally closed contacts.
#### 0907 PB 12-RELAY INDUSTRIAL PCB BOARD
If your control setup needs a bank of relay connections, the 0907 PB is the only listing here with 12 relay ports. It comes in new open-box condition and is described as durable and reliable enough for industrial automation or control work. The USD 350.00 price is clearly the highest of the four, so this is not a casual spare. It makes sense when you are designing or repairing a board that needs a bank of relays rather than a single relay socket. The main details are relay-port count, the 0907 PB model number, and the open-box condition.
#### INDUSTRIAL SPARE SSR-40DA RELAY 24/480V NSNP
The SSR-40DA relay is the spare in this group. The title carries the 24/480V rating and the SSR-40DA designation, which suggests a solid-state relay design. At USD 8.00 it is the least expensive item here, and its new open-box condition makes it an easy pick when you need a low-priced spare for a system where voltage range matches. The relay name and the 24/480V range are the main specs given, so this is not a good choice when you need detailed control specifications. Treat it as a spare part to evaluate against your existing circuit.
Final Recommendation
Choose the SQUARE D 8501 X080 if you need a used control relay with a named part number, an expandable 8-pole base, and a described working condition. Choose the 0907 PB board if you need a large relay bank on one PCB. Choose the AMS 4419 Rev G only if you are repairing boards and can accept an untested, as-is PCB. Choose the SSR-40DA if a 24/480V match is what you need in a spare.
