Omron K8AB-VS1 100/115VAC Voltage Sensing Relay
Omron K8AB-VS1 100/115VAC, Series K8AB-VS, Voltage Sensing AC/DC relay, SPDT (1 Form C), 6~300mV AC/DC trip range, 0.1~30 Sec delay, 100~115VAC supply, DIN rail mount.
Specifications
| Parameter | Value |
|---|---|
| Series | K8AB-VS |
| Type | Voltage Sensing AC/DC |
| Parameter | Value |
|---|---|
| Supply voltage | 100 ~ 115VAC |
| 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 |
| Trip range | 6 ~ 300mV AC/DC |
| Contact rating @ voltage | 6A @ 250VAC |
Product details
Frequently asked questions
What voltage range does the K8AB-VS1 100/115VAC monitor?
It senses AC or DC voltage from 6 mV up to 300 mV, with an adjustable trip point within that range. The control supply voltage is 100 to 115 VAC, separate from the monitored signal.
What is the output configuration and contact rating?
A single SPDT (1 Form C) relay rated 6 A at 250 VAC. The adjustable delay of 0.1 to 30 seconds allows the output to ignore brief transients before tripping.
What this voltage relay does that a standard phase monitor cannot
The K8AB-VS1 100/115VAC is a dedicated voltage sensing relay from Omron's K8AB-VS series, designed to monitor AC or DC voltage levels down to the millivolt range — 6 to 300 mV AC/DC trip threshold. That sub-volt sensitivity is what sets it apart from a standard phase-loss or overvoltage relay that typically starts at 1 V or higher. It operates on a 100 to 115 VAC control supply and switches a single SPDT (1 Form C) relay output rated 6 A at 250 VAC. The adjustable delay from 0.1 to 30 seconds lets you time-grade the response so momentary dips don't trigger nuisance trips on the line.
Sourcing reality — obsolete, not gone
Omron lists the K8AB-VS1 100/115VAC as obsolete. The part is still available through independent surplus and broker channels — quantities are lot-specific and confirmed at RFQ, not held in stock. For a line-down situation or a BOM that needs this exact order code, the sourcing path is a quoted-to-order RFQ through distribution that can locate the remaining inventory. No pin-compatible alternative from the K8AB-VS family has been designated as a formal successor.
DIN rail integration and panel fit
The relay mounts on standard DIN rail, so it slots into an existing control panel alongside other K8AB-series monitors or general-purpose relays. The box-style package occupies a single module width — no special cutout or panel drilling needed. Rated for -20°C to 60°C operating ambient, it handles the thermal environment inside a closed electrical enclosure without forced cooling, provided the panel design keeps internal rise within that window.