Description
Product Core Brief
- Model: EMR5-W500-1-D
- Brand: EATON
- Series: EMR5 Phase Monitoring
- Core Function: Protects 3-phase motors from phase loss, voltage imbalance, and over/under voltage.
- Product Type: Phase & Voltage Monitoring Relay
- Key Specs: 300-500V AC | 22.5mm Width | DPDT Contacts
(Condition: New Original / New Surplus)
Product Introduction
EATON acts as the first line of defense for industrial 3-phase motors. This monitoring relay continuously checks line voltage for phase loss, sequence errors, and dangerous fluctuations.
The EATON prevents costly motor burnouts in milliseconds. It features adjustable trip delays from 0.1 to 30 seconds to handle temporary sags. This industrial automation unit saves you from catastrophic winding failures.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | EATON |
| Part Number | |
| Alternate ID | 134224 |
| Component Type | Phase & Voltage Monitor |
| Supply Voltage | 300 → 500 V AC |
| Contact Config | DPDT (2 Form C) |
| Trip Delay | 0.1 → 30 Seconds |
| Width | 22.5 mm |
| Mounting | DIN Rail |
| Standards | UL 508, CSA, CE, IEC 60947 |
Quality Control Process
Every EATON undergoes rigorous electrical validation. Technicians inspect the DIN rail clip and screw terminals for tightness. We then perform a functional test on a 3-phase variac simulator. A Fluke power quality analyzer verifies the trip points at 380V undervoltage and 500V overvoltage thresholds. We also confirm the DPDT contacts switch cleanly under load. Finally, the unit is sealed in anti-static packaging to prevent internal component damage.
Replacement Pitfall Guide
❗ Verify Voltage Range First. The EATON covers 300-500V AC. Do not use this on 208V or 600V systems. Incorrect voltage selection will cause immediate nuisance tripping or failure to protect.
❗ Check Phase Sequence. This relay monitors phase rotation. If your motor runs backward after replacement, swap any two incoming lines. The relay will lock out if the sequence is reversed.
❗ Adjust Delay for Load Type. Don’t leave the delay at factory default. High-inertia loads need a longer delay (5-10s) to prevent tripping during startup. Sensitive pumps may need 0.1-1s.
❗ Tighten Torque Specs. Loose power connections cause arcing and false phase loss alarms. Use a calibrated torque screwdriver on the screw terminals. Vibration will loosen them over time.
Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
| Original Model | Replacement / Successor Model | Compatibility Level (Direct/Needs Adaptation) | Migration Notes |
|---|---|---|---|
| EMR5-AW500-1-D | Direct | Same specs, different internal revision | |
| EMR5-W300-1-C | Needs Adaptation | Lower voltage range; verify system voltage | |
| EMR5-AWN500-1 | Needs Adaptation | Different contact config; check wiring diagram |
- Response Time: < 20ms for Phase Loss Detection
- Reliability: Rated for > 100,000 Operations at Full Load
