Omron K8DS-PH1 — 3-Phase Phase Loss Relay, 200-480 V
SKU: K8DS-PH1USD 11.00
Omron K8DS-PH1 3-phase phase-sequence / phase-loss monitoring relay, 200-480 VAC, SPDT 5 A, 17.5 mm DIN-rail. In stock, China shipping.
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Product Overview
The Omron K8DS-PH1 is a 3-phase phase-sequence and phase-loss monitoring relay from the K8DS series, manufactured by Omron Corporation. Hengyixin Automation stocks this relay in Xiamen and ships within 3-5 business days in original Omron packaging with the lot code visible.
The relay monitors a 3-phase 3-wire supply from 200 to 480 VAC using voltage detection. It detects phase sequence at startup in 0.1 s +/- 0.05 s and phase loss during operation in 0.1 s max when the voltage drops from 100% to 0% of rated. Phase-loss detection level is 80% +/- 10% of rated input. Reset is automatic.
The 17.5 mm wide DIN-rail housing carries one SPDT output relay rated 5 A at 250 VAC resistive, 5 A at 30 VDC resistive. PWR green LED shows power; RY yellow LED shows relay state. The K8DS-PM2 sibling adds over / under voltage monitoring; the K8DS-PU2 monitors single-phase voltage on the same 17.5 mm body.
Key Features
- K8DS-PH 3-phase phase-sequence and phase-loss monitoring relay, 200-480 VAC 3-wire input, 17.5 mm wide DIN-rail housing
- Phase-sequence operating time 0.1 s +/- 0.05 s, phase-loss operating time 0.1 s max at 100% to 0% rated drop
- One SPDT output relay, 5 A at 250 VAC / 5 A at 30 VDC resistive, automatic reset, 80% +/- 10% phase-loss detection level
- Continuous 500 V overload, PWR green / RY yellow LED, IP20 terminals, -20 to +60 C operating
- SKU: K8DS-PH1
- Series: Omron K8DS-series measuring and monitoring relay
Best-Fit Applications
- Phase-loss protection on a 3-phase 415 V pump motor where reverse-rotation of the impeller would damage the volute
- Phase-sequence check at the main incomer of a 3-phase 200 V HVAC chiller that must reject mis-wired phases at startup
- Spare replacement on a 3-phase 480 V conveyor panel where the previous K8DS-PH1 relay has reached end of electrical life
Buying Checklist
- Pick the K8DS-PH1 for a 3-phase phase-sequence and phase-loss monitoring relay at 200-480 VAC on a 17.5 mm DIN-rail housing.
- Pick the K8DS-PM2 instead when the cabinet also needs over / under voltage monitoring on the same 17.5 mm body.
- Pick the K8DS-PU2 instead when the supply is single-phase and only the voltage range needs to be watched.
Technical Specifications
| Manufacturer | Omron Corporation (Japan) |
|---|---|
| Series | Omron K8DS-series measuring and monitoring relay |
| Model / SKU | K8DS-PH1 |
| Function | 3-phase phase-sequence and phase-loss monitoring relay (voltage detection) |
| Rated Input | 3-phase 200 to 480 VAC, 3-wire |
| Input Burden | Approx 2.7 VA |
| Operating Time | Phase sequence 0.1 s +/- 0.05 s, phase loss 0.1 s max at 100% to 0% rated drop |
| Detection Level | Phase-loss 80% +/- 10% of rated input |
| Output | One SPDT relay (NC operation), 5 A at 250 VAC / 5 A at 30 VDC resistive, 1,250 VA / 150 W max |
| Reset Method | Automatic reset |
| Indicators | PWR green LED, RY yellow LED |
| Environment / Mounting | 17.5 (W) x 80 (H) x 73 (D) mm, 60 g, IP20 terminals, DIN-rail mount, -20 to +60 C, PC UL 94 V-0 case |
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-PH1
What is the Omron K8DS-PH1 used for?
It is a 3-phase phase-sequence and phase-loss monitoring relay for industrial power supplies. The relay detects reversed phase order at startup and dropped phases during operation on a 200-480 VAC 3-wire supply, and trips an SPDT output to disconnect downstream motors.
K8DS-PH1 vs K8DS-PM2 - what is the difference?
The K8DS-PH1 monitors phase sequence and phase loss only. The K8DS-PM2 also monitors over voltage and under voltage on the same 17.5 mm DIN-rail body. Pick the PH1 when only the phase order and presence matter; pick the PM2 for full 3-phase voltage quality.
Does the K8DS-PH1 need a separate supply?
No. The power supply voltage is the same as the rated input voltage (the measured 3-phase 200-480 VAC supply also powers the relay), so no separate 24 VDC or 100-240 VAC supply wiring is required.
How fast does the K8DS-PH1 trip on phase loss?
0.1 s max when the voltage drops from 100% to 0% of the rated input. Phase-sequence trips in 0.1 s +/- 0.05 s. The relay auto-resets when the supply returns to normal.
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