Omron K8DS-PM2 — 3 Phase Voltage Relay, 380 480
SKU: K8DS-PM2USD 12.50
K8DS series 17.5 mm relay for 3-phase under/over-voltage, reverse-phase and phase-loss, 380-480 VAC, 1 × SPDT 5 A output.
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Product Overview
The Omron K8DS-PM2 is a 17.5 mm-wide single-function monitoring relay for three-phase power. It is manufactured by Omron Corporation. Hengyixin Automation stocks this relay in Xiamen and ships within 3-5 business days to most Asian, European, and North American ports.
1 × SPDT contact, AC250 V / DC30 V 5 A resistive 17.5 mm DIN-rail housing, PFP-100N / PFP-50N rail Rated input 380/400/415/480 VAC, 3-phase 3-wire (rotary switch) 17.5 mm DIN-rail housing, PFP-100N / PFP-50N rail
Rated input 380/400/415/480 VAC, 3-phase 3-wire (rotary switch) 17.5 mm DIN-rail housing, PFP-100N / PFP-50N rail
Put the SPDT contact into the motor contactor holding-coil circuit so a trip drops the contactor out.
Key Features
- Rated input 380/400/415/480 VAC, 3-phase 3-wire (rotary switch)
- 17.5 mm DIN-rail housing, PFP-100N / PFP-50N rail
- 1 × SPDT contact, AC250 V / DC30 V 5 A resistive
- 3-phase voltage, reverse-phase and phase-loss monitoring
- SKU: K8DS-PM2
- Series: K8DS three-phase voltage monitoring relay
Best-Fit Applications
- Line-side monitoring upstream of a 400 V variable-frequency drive cabinet
- European/Asian 400 V three-phase supply protection for motors and pumps
- Spare replacement for legacy APR-S phase relays on older panels
Buying Checklist
- Choose K8DS-PU2 for undervoltage only at 380-480 VAC.
- Choose K8DS-PZ2 when voltage imbalance is also a concern.
- Choose K8DS-PM1 for the same monitoring on a 200-240 VAC three-wire supply.
Technical Specifications
| Series | K8DS three-phase voltage monitoring relay |
|---|---|
| Function | 3-phase voltage (under/over), reverse-phase and phase-loss |
| Rated Input | 3-phase 380/400/415/480 VAC, 3-wire (rotary switch) |
| Input Burden | Approx. 2.7 VA at 400 VAC |
| Operation Time | Reverse-phase / phase-loss: 0.1 s ± 0.05 s; voltage: 0.1 to 30 s |
| Reset Method | Automatic reset (manual reset via power cycle) |
| Output | 1 × SPDT (1c), NC operation (opens on trip) |
| Contact Rating | AC250 V 5 A resistive / DC30 V 5 A resistive |
| Indicators | PWR (green) power / RY (yellow) relay status |
| Mounting | DIN rail (PFP-100N / PFP-50N) or M4 panel screw |
| Operating Temperature | -20 to +60 °C |
| Operating Humidity | 25 to 85 % RH |
Manufacturer documentation
Omron's own product page, where the manufacturer's current specification and lifecycle information are published. We are an independent distributor and cannot mirror those documents; the link goes to Omron's site.
FAQ for K8DS-PM2
What is the difference between K8DS-PM2 and K8DS-PH1?
K8DS-PH1 monitors reverse-phase and phase-loss only. K8DS-PM2 adds three-phase undervoltage and overvoltage on a 380-480 VAC supply. Pick PH1 when the cabinet is already on a UPS and only the rotation / phase-presence check is needed; pick PM2 when brownouts and spikes on a 400 V-class supply also need to be caught.
Does the K8DS-PM2 need a neutral connection?
No. It is a three-wire voltage-detection relay — only the three phases (L1, L2, L3) connect to the input. The relay measures phase-to-phase voltage, not phase-to-neutral, so it works on delta and ungrounded-wye supplies where a neutral is not present at the relay.
How do I set the K8DS-PM2 for 380 V / 400 V / 415 V / 480 V?
The rotary switch on the front selects the nominal rated input voltage: 380, 400, 415, or 480 VAC. Set it to the closest match before applying power. The trip thresholds are derived from this setting, so a switch set to 400 V on a 415 V supply will under-detect. Cycle power after changing the switch so the new threshold takes effect.
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