The Omron K8AK-PA1 200/240VAC is a three-phase monitoring relay that watches for voltage asymmetry, phase loss, and incorrect phase sequence. It's powered directly from the line at 200 to 240 VAC, so no separate control transformer needed if your panel has that voltage available. Output is a single-pole double-throw relay rated 5 A at 250 VAC — enough to drive a contactor coil, alarm, or PLC input. The adjustable delay, from 0.1 to 30 seconds, lets you ride through brief dips or motor inrush without tripping.
Omron K8AK-PA1 200/240VAC Phase Monitoring Relay, Active
MPNK8AK-PA1 200/240VAC
Active
Omron K8AK Series Phase Monitoring Relay, Type Voltage Asymmetry, Phase Loss, Phase Sequence, 200 ~ 240VAC Supply, SPDT Relay Output, 5A @ 250VAC Contact Rating, DIN Rail Mount, Adjustable Delay 0.1-30 Sec.
$162.26Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
Specifications
| Parameter | Value |
|---|---|
| Series | K8AK |
| Type | Voltage Asymmetry, Phase Loss, Phase Sequence |
| Parameter | Value |
|---|---|
| Supply voltage | 200 ~ 240VAC |
| Parameter | Value |
|---|---|
| Output type | Relay |
| Parameter | Value |
|---|---|
| Operating temperature | -20°C~60°C |
| Parameter | Value |
|---|---|
| Mounting type | DIN Rail |
| 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 conditions does this relay monitor?
It monitors voltage asymmetry, phase loss (single-phasing), and phase sequence on a three-phase supply.
What is the supply voltage requirement?
The relay operates on 200 to 240 VAC, which powers both the monitoring circuitry and the output relay coil.
What is the relay contact rating?
The SPDT output contacts are rated 5 A at 250 VAC (resistive).
Is the delay time adjustable?
Yes, the trip delay is adjustable from 0.1 seconds up to 30 seconds via a front-panel potentiometer.
MPN
K8AK-PA1 200/240VAC