Potential Relay model 90-66 — the relay that disconnects the start capacitor once the idler motor reaches operating speed. If your phase converter's start capacitor keeps blowing, or the converter won't transition smoothly from start to run, the potential relay is often the culprit.
| Type | Potential Relay |
| Model | 90-66 |
| Application | Phase converter starting circuit — disconnects start capacitor |
📦 What's Included
- ✅ Potential Relay 90-66
The potential relay senses back-EMF voltage and disconnects the start capacitor at the right moment. A failed relay can leave the start cap in circuit, causing it to overheat and fail.
If you're replacing start capacitors frequently, check the potential relay — it may not be disconnecting the cap on time, causing premature failure.
Need help finding the right part? Our team knows these converters inside and out.
Potential Relay model 90-66 for rotary phase converter starting circuits. This relay disconnects the start capacitor once the idler motor reaches operating speed. A failed potential relay is a common cause of repeated start capacitor failures. If your phase converter blows start caps frequently or doesn't transition smoothly to run mode, replace this relay. Call (800) 417-6568 for troubleshooting.
