When you are choosing among relays, contactors, and industrial switches, the first fork in the road is picking between a power relay and a motor-starter contactor. The two units here sit at opposite ends of that decision: a Struthers-Dunn 219XBX69P industrial automation power relay and a Modern Power AC Contactor built around an 18A working current. One answers to a 115/125 VDC coil; the other is an AC110V 50/60Hz motor starter relay. Your coil voltage, load current, and panel environment decide which one belongs in your build.
Quick verdict
Pick the Struthers-Dunn 219XBX69P when you need a dedicated DC power relay for commercial, control equipment panel, or industrial use. Pick the Modern Power AC Contactor when you are wiring an AC motor starter and want a compact 18A unit that works with 110V control circuits. The practical difference comes down to current type, application focus, and a price spread that runs from the high end of the range down to a much lower entry point.
Side-by-side comparison
| Struthers-Dunn 219XBX69P | Modern Power AC Contactor | |
|---|---|---|
| Price | USD 319.99 | USD 16.91 |
| Type | Power Relay | Power AC Contactor |
| Coil voltage / current | 115/125 VDC | AC110V 50/60Hz |
| Typical role | Commercial, control equipment panels, industrial | Motor starter / main power switch |
Where each product wins
- Struthers-Dunn 219XBX69P wins when your control circuit runs on DC and the relay needs to fit into a commercial or industrial panel. Its DC coil, power relay construction, and 115/125 VDC rating make it the more specialized automation component.
- Modern Power AC Contactor wins when the job is starting an AC motor or switching power in a 110V circuit. The 18A working current and built-in auxiliary contacts suit a straightforward motor-starter layout at the lower end of the price spread.
Product notes
Struthers-Dunn 219XBX69P-115/125VDC Industrial Automation Power Relay
This is the relay to reach for when your panel is built around DC control. The 115/125 VDC coil matches systems that use DC-powered control loops, and the application list includes commercial, control equipment panels, and industrial settings. At USD 319.99 it is also the higher-priced unit of the pair, so the cost makes sense when the project genuinely needs a dedicated DC power relay. The trade-off is that its DC coil type does not make it a substitute for an AC motor starter; if your circuit starts at AC110V, the contactor side of this comparison is the better match. Choose it for precise control in professional control panels, not for general AC switching.
Modern Power AC Contactor AC110V 50/60Hz Motor Starter Relay 18A Working Current
The Modern Power contactor takes the opposite approach: it is an AC110V 50/60Hz motor starter relay with an 18A working current, and it is priced at USD 16.91. That makes it the lower-priced way to add motor starting or main power switching to a compact control setup. The unit uses a plastic, impact-resistant body, built-in auxiliary contacts that work with momentary buttons, and stable performance for long service life. The 18A rating is the practical boundary: respect it for modest motor loads, and this unit becomes a straightforward mechanical switch for everyday control circuits. Its limitation is that the AC coil keeps it out of DC control loops. If your panel is DC-based, the Struthers-Dunn relay is the appropriate pick rather than this contactor.
Final choice by use case
For a commercial or industrial control panel with 115/125 VDC control wiring, the Struthers-Dunn 219XBX69P is the right fit. For an AC110V motor starter or main power switch with a lower spending target, the Modern Power AC Contactor handles the job at the lower end of the price spread.
