Description
The Macromatic PMD575 is a heavy-duty, 575 VAC 3-phase line voltage monitoring relay engineered to protect industrial equipment, high-voltage motors, and commercial HVAC systems against severe power quality faults. Using True RMS voltage sensing technology, the PMD575 delivers accurate monitoring across a wide voltage range of 345 to 660 VAC, making it ideal for systems prone to line distortion or harmonics.
Housed in a compact 2.07 in (52.5 mm) modular enclosure, this relay continuously evaluates incoming 3-phase power against five critical fault conditions: phase loss, phase reversal, phase unbalance, undervoltage, and overvoltage. Operators can fine-tune protection parameters via front-panel analog dials, including adjustable undervoltage (80–95%), adjustable phase unbalance (2–10%), adjustable trip delay (0.3 to 30 seconds), and adjustable restart delay (1 to 300 seconds). Equipped with heavy-duty 10A DPDT contacts, a bi-color diagnostic LED with lost-phase memory, and dual mounting capabilities for 35mm DIN rail or panel surface mounting, the PMD575 offers robust defense against rapid equipment cycling and phase failure.
Key Features
- Comprehensive 5-Point 3-Phase Protection: Protects 575 VAC machinery against phase loss, phase reversal, phase unbalance, undervoltage, overvoltage, and rapid cycling.
- True RMS Voltage Measurement: Provides accurate, reliable line voltage sensing even on power grids with high electrical noise or non-linear loads.
- Fully Adjustable Field Settings: Features independent front-panel controls for undervoltage (80–95%), phase unbalance (2–10%), fault delay (0.3–30 s), and restart delay (1–300 s).
- Dual Mounting Flexibility: Snaps directly onto standard 35mm DIN rail or surface mounts to panel backplates using integrated extended mounting clips for #8 screws.
- Heavy-Duty 10A DPDT Output: Double Pole Double Throw (DPDT) contact configuration provides versatile control circuit interlocks and alarm signaling.
- Diagnostic LED with Fault Retention: Top-mounted bi-color LED gives immediate visual fault diagnostics and retains indication even if a phase is completely lost.
- Selectable Auto / Manual Reset: Resets automatically upon fault recovery, or supports manual reset wiring via an external switch connected across terminals 4 and 5.
Specifications
| Technical Specification | Detail |
|---|---|
| Product Model | PMD575 |
| Brand | Macromatic |
| Product Type | 3-Phase Voltage Monitoring Relay (DIN Rail / Surface Mount) |
| Nominal Line Voltage | 575 VAC (50/60 Hz) |
| Monitored Voltage Range | 345 to 660 VAC |
| Measurement Type | True RMS |
| Protection Functions | Phase Loss, Phase Reversal, Phase Unbalance, Undervoltage, Overvoltage, Rapid Cycling |
| Output Contact Configuration | 10A DPDT |
| Contact & HP Ratings | 10 A @ 277 VAC / 30 VDC, 1/2 HP @ 120/240 VAC (N.O.), 1/3 HP @ 120/240 VAC (N.C.), Pilot Duty B300 / R300 (N.O.) |
| Undervoltage Threshold / Reset | Adjustable 80% to 95% of line voltage (Resets at +3% of trip setting) |
| Overvoltage Threshold / Reset | Fixed at 110% of line voltage (Resets at 107% of line voltage) |
| Phase Unbalance Threshold | Adjustable 2% to 10% unbalance |
| Fault Drop-out Response Times | Phase Loss & Reversal: 100 ms fixed | Under/Overvoltage & Normal Unbalance: 0.3 to 30 s adjustable | Severe Unbalance (>2x setting): 0.3 to 2 s |
| Restart Time Delay | 1 to 300 seconds (Adjustable) |
| Reset Modes | Automatic (or Manual via external N.C. switch across terminals 4 & 5) |
| Power Consumption | Less than 40 VA |
| Enclosure Width & Mounting | 2.07 in (52.5 mm) width; 35mm DIN Rail Mount or Surface Panel Mount via two #8 screws |
| Status Indication | Top-mounted bi-color LED (Normal state and specific fault diagnostics) |
| Operating Temperature Range | -18°F to 149°F (-28°C to 65°C) |
| Lifespan | Mechanical: 10,000,000 operations | Full Load: 100,000 operations |
| Primary Applications | 575V 3-phase motor protection, industrial pumping systems, commercial HVAC compressors, heavy machinery control panels |
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