The K8DS-PA1 is a three-phase monitoring relay from Omron's K8DS series, designed to detect voltage asymmetry, phase loss, and incorrect phase sequence on a three-phase supply. Supply voltage is fixed at 200-240 VAC, so the relay is intended for standard three-phase systems within that range. Output is a single-pole double-throw (SPDT) relay rated 5 A at 250 VAC — sufficient to switch a contactor coil or signal a PLC input. An adjustable delay from 0.1 to 30 seconds prevents nuisance tripping during transient conditions such as motor startup or momentary supply dips. The unit mounts on a DIN rail in a narrow 17.5 mm housing, fitting densely populated panels. Rated for operation from -20°C to 60°C, covering most industrial environments.
Omron K8DS-PA1 Phase Sequence/Asymmetry Relay, 200-240VAC
MPNK8DS-PA1
Active
Omron K8DS-PA1, Series K8DS, 17.5 mm Phase Sequence & Asymmetry / Phase Loss Relay, SPDT 5A @ 250VAC, Adjustable Delay 0.1–30s, DIN Rail, 200-240VAC Supply.
$148.81 – $171.80Ref. price · indicative, final on quote
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MOQ1 pcs
Sourced new & surplus through independent channelsListing updated Jun 2026
Specifications
Identification
| Parameter | Value |
|---|---|
| Series | K8DS |
| Type | Voltage Asymmetry, Phase Loss, Phase Sequence |
Electrical
| Parameter | Value |
|---|---|
| Supply voltage | 200 ~ 240VAC |
I/O
| Parameter | Value |
|---|---|
| Output type | Relay |
Environmental
| Parameter | Value |
|---|---|
| Operating temperature | -20°C ~ 60°C |
Mechanical
| Parameter | Value |
|---|---|
| Mounting type | DIN Rail |
Other specifications
| Parameter | Value |
|---|---|
| Circuit | SPDT (1 Form C) |
| Delay time | 0.1 Sec ~ 30 Sec |
| Contact rating @ voltage | 5A @ 250VAC |
Product details
Frequently asked questions
What type of monitoring does the K8DS-PA1 perform?
The K8DS-PA1 is a voltage asymmetry, phase loss, and phase sequence monitoring relay.
What is the supply voltage requirement?
Supply voltage is fixed at 200-240 VAC.
What is the delay time range?
Delay time is adjustable from 0.1 to 30 seconds.
What series does the K8DS-PA1 belong to?
The K8DS-PA1 is part of Omron's K8DS series.
MPN
K8DS-PA1