The decision
When you're sorting through relays, contactors, and industrial switches, the first question is how much switching the relay has to handle. Some panels need a simple voltage-rated relay; others need a single component with many normally closed contacts and enough thermal capacity for multiple switching paths. The relays in this head-to-head take different routes to that goal.
Quick verdict
At $8.00, the INDUSTRIAL SPARE SSR-40DA is the low-price pick for a straightforward 24/480V switching job. At $27.99, the SQUARE D 8501 X080 is the contact-heavy choice when you need 8NC contacts, a 10A rating, and a 12-pole expandable base.
At a glance
| Relay | Listed price | Condition | Key differentiators |
|---|---|---|---|
| INDUSTRIAL SPARE SSR-40DA RELAY 24/480V NSNP | USD 8.00 | New - Open box | 24/480V SSR-40DA relay |
| SQUARE D 8501 X080 Industrial Control Relay 8NC 12P 10A Total 120/110V Coil | USD 27.99 | Used | 8NC contacts, 10A thermal rating, 12-pole expandable base |
Where each relay stands out
INDUSTRIAL SPARE SSR-40DA: The reason to pick this relay is the low-cost, no-nonsense 24/480V rating. It is a new open-box SSR that covers a specific voltage range without adding contact complexity.
SQUARE D 8501 X080: The reason to pick this relay is contact density. With 8 normally closed contacts, a 10A continuous rating, and a base that expands to 12 poles, it can handle multiple switching paths in one component.
Product notes
INDUSTRIAL SPARE SSR-40DA RELAY 24/480V NSNP
This SSR-40DA is the lower-priced relay in this pair and a new open-box component. Its 24/480V rating makes it a direct fit for a specific circuit voltage, and the simple form keeps the installation straightforward. The limitation is that the relay is defined by that 24/480V rating. If your panel needs several normally closed contacts or an expandable pole base, this is not the relay that will provide that kind of contact density. For a basic 24/480V switching job, though, this SSR keeps the panel simple and the cash outlay low.
SQUARE D 8501 X080 Industrial Control Relay 8NC 12P 10A Total 120/110V Coil
The Square D 8501 X080 is the higher-priced relay, but it packs more into one unit. It has 8 normally closed contacts, a 10A continuous thermal rating, and a base that expands to 12 poles, which makes it useful when one relay has to handle several switching paths. The tradeoff is condition: this is a used unit, and it may show scratches, scuffs, or signs of handling and installation. It is described as pre-owned, tested, and fully functional, so the main concern is cosmetic rather than operational. If you need dense contact capacity, this relay earns its higher price.
Final choice by use case
Pick the INDUSTRIAL SPARE SSR-40DA for a basic 24/480V relay replacement where keeping the cost down matters more than contact count. Pick the SQUARE D 8501 X080 for a control panel that needs 8NC contacts, a 10A rating, and room to grow to 12 poles. If you're updating a dense relay setup, the Square D is the ready workhorse; if you just need one relay for a known voltage range, the SSR-40DA is the leaner fit.
