When you're choosing among relays, contactors, and industrial switches, the real decision usually comes down to coil voltage and contact configuration. Two relays may look similar in a panel, but one is built for DC-powered control systems while the other is made for standard AC control circuits. The Struthers-Dunn 219XBX69P and the Square D 8501 X080 sit on opposite ends of that spectrum, and the best choice depends on your circuit type and your tolerance for used parts.
Quick Verdict
If your control circuit runs on DC, the $319.99 Struthers-Dunn 219XBX69P is the straightforward pick: it's a new power relay rated for 115/125 VDC. If your panel runs on 120V AC and you want an expandable NEMA control relay, the $27.99 Square D 8501 X080 is the more practical option.
Side-by-Side Comparison
| Struthers-Dunn 219XBX69P | Square D 8501 X080 | |
|---|---|---|
| Price | $319.99 | $27.99 |
| Relative price | ||
| Coil voltage | 115/125 VDC | 110/120 VAC |
| Current type | DC | AC |
| Condition | New | Used |
| Relay type | Power relay | Heavy-duty NEMA control relay |
| Best for | DC-powered panels | AC-powered panels |
Where Each Relay Wins
The Struthers-Dunn 219XBX69P wins when you need a new DC power relay for commercial, control equipment, or industrial panels. The 115/125 VDC coil and DC current type make it a direct fit for DC control circuits.
The Square D 8501 X080 wins when you're working with 120V AC control power and want a heavy-duty NEMA control relay. The expandable 8-pole base and 8 normally closed contacts give you flexibility, and the used condition is an acceptable trade-off for many retrofits.
Product Notes
Struthers-Dunn 219XBX69P-115/125VDC Industrial Automation Power Relay
The Struthers-Dunn 219XBX69P is centered on a 115/125 VDC coil and a DC current type, so it matches control systems that already operate on DC. It is listed as new, meaning you are not inheriting wear from a previous panel. The stated application areas are commercial, control equipment panels, and industrial, and the relay is classified as a power relay, which points to heavier switching duty in a panel. If your control circuit uses 115/125 VDC and you want a fresh component that is ready to install, this is a strong match. The trade-off is that the DC coil locks it out of standard 120V AC control circuits, and its design is a broader power relay rather than a compact NEMA control relay with an expandable pole base.
SQUARE D 8501 X080 Industrial Control Relay 8NC 12P 10A Total 120/110V Coil
This Square D control relay is built for heavy-duty NEMA control work. The 8501 X080 starts with an 8-pole base that can be expanded up to 12 poles, and the contact configuration is 8 normally closed contacts with a 10A continuous thermal current rating. The coil is rated for 110V AC at 50Hz and 120V AC at 60Hz, so it aligns with common AC control circuits. It is a used unit, described as thoroughly tested and fully functional, with possible minor cosmetic wear from handling or installation. That used condition is the main limitation to weigh: the part is pre-owned and may show scratches or scuffs. If your panel runs on 120V AC and you need an expandable, high-contact-count control relay, this gives you a lot of switching capacity without requiring a DC coil.
Final Choice by Use Case
Choose the Struthers-Dunn 219XBX69P if your control circuit is DC and you want a new power relay that can handle commercial and industrial panel duty. Choose the Square D 8501 X080 if your control circuit is 120V AC and you prefer an expandable NEMA control relay with normally closed contacts. For DC-powered new builds, the Struthers-Dunn is the right match; for AC control retrofits and repairs, the Square D is the one to put in the panel.
