Dayton
Dayton PMPU-FA8B18 Phase Monitor Relay 190-500V AC 8 Pin 10A
Monitors three-phase power for loss, reversal, unbalance, overvoltage and undervoltage with SPDT contacts rated 10 A at 277 V AC
- Monitors overvoltage, phase loss, reversal, unbalance and undervoltage across 190-500V AC
- SPDT contacts rated 10 A at 277 V AC for reliable switching
- Auto and manual restart with 2 sec delay prevents nuisance trips
- Compact plug-in octal base fits standard 8-pin sockets
- Body measures 2.9 in high, 1.7 in wide, 2.4 in deep
Phase Monitor Relay for 190-500V AC Systems
The Dayton PMPU-FA8B18 is a plug-in phase monitor relay designed for three-phase electrical systems operating between 190 and 500V AC. It protects connected equipment by continuously monitoring for overvoltage, undervoltage, phase loss, phase reversal, and phase unbalance conditions. The unit features an octal 8-pin base and a compact body measuring 1.7 in wide, 2.4 in deep, and 2.9 in high.
Replaces Basic Voltage-Only Monitoring Devices
This relay upgrades installations that rely solely on simple voltage checks by adding comprehensive phase-sequence and balance protection. The jump is worth it when motors or compressors risk damage from single-phasing or reverse rotation caused by incorrect wiring or supply faults. It offers a 10 A SPDT contact rating at 277V AC and 7 A at 30V DC for direct control circuit switching.
Sustained Operation With Auto or Manual Restart
Under persistent fault conditions the relay holds the output open until the supply returns within limits, preventing rapid cycling of heavy loads. A fixed 2-second restart time delay adds stability after momentary dips or transients clear. Users can select automatic restart for unattended sites or manual reset for scenarios requiring a safety inspection before power is restored. Buyers needing DIN-rail mounting or analog adjustment knobs will not find those features here.
Highlights
- Monitors overvoltage, phase loss, reversal, unbalance and undervoltage across 190-500V AC
- SPDT contacts rated 10 A at 277 V AC for reliable switching
- Auto and manual restart with 2 sec delay prevents nuisance trips
- Compact plug-in octal base fits standard 8-pin sockets
- Body measures 2.9 in high, 1.7 in wide, 2.4 in deep
Specifications
| Brand | DAYTON |
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Questions about this item
What octal-base socket depth is needed for the 2.4 in body?
The relay body is 2.4 in deep, 2.9 in high and 1.7 in wide; allow socket depth plus wiring clearance behind the panel.
Which pin on the 8-pin base must be wired for the 2-second restart delay to function?
Wire the 8-pin octal base per the manufacturer diagram; the auto/manual restart delay is internal and activates once control power is applied.
How often should the SPDT contacts rated 10 A at 277 V AC be inspected for wear?
Inspect contacts during scheduled panel maintenance; replace the relay if contact discoloration, pitting or overheating signs appear.
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