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Product Index :: Industrial Components ::

Level/Monitoring Controllers :: Measuring & Monitoring Relays

K8AB Series Measuring and Monitoring Relays


K8AB Series Measuring and Monitoring Relays

 

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* Ordering information

* Specifications

* Configurations

* Dimensions, and etc

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  can be found in our PDF brochure.

 

 

 

 

Eight Slim Models Featuring a Variety of Innovative New Functions

  • Eight slim models featuring a variety of innovative new functions:
    Single-phase power monitoring: Current relay, Voltage relay, Upper-/lower-limit voltage relays.
    Three-phase power monitoring: Phase sequence relay, Voltage with phase loss relay, Voltage asymmetry relay, Voltage relay.

 

Product Lineup

 

K8AB-AS 1-Phase Current Relay

 

1-Phase Current Relay

K8AB-AS

• Over or under current

• Manual/automatic reset

• Normal ON/normal OFF

• ON delay and operation time

 

 

K8AB-VS 1-Phase Voltage Relay

 

1-Phase Voltage Relay

K8AB-VS

• Over or under voltage

• Manual/automatic reset

• Normal ON/normal OFF

• ON delay and operation time

 

 

K8AB-VW 1-Phase Voltage Relay

1-Phase Voltage Relay

K8AB-VW

• Over or under voltage

• Pre-alarm warning mode

• ON delay and operation time

 

K8AB-PH 3-Phase Sequence, Loss Relay

 

3-Phase Sequence, Loss Relay

K8AB-PH

• 200 to 500 VAC with a single K8AB-PH.

• Power supply/output relay status indicators

 

K8AB-PA 3-Phase Asymmetry Sequence, Loss Relay

 

3-Phase Asymmetry Sequence, Loss Relay

K8AB-PA

• 3-/4-wire selection for 3-phase power supply

• Input range selection

 

 

K8AB-PM 3-Phase Voltage, Sequence, Loss Relay

 

3-Phase Voltage, Sequence, Loss Relay

K8AB-PM

• Over or under voltage

• All-in-one configuration

• 3-/4-wire selection for 3-phase power supply

• Input range selection

 

 

K8AB-PW 3-Phase Voltage Relay

 

 

3-Phase Voltage Relay

K8AB-PW

• Over or under voltage

• 3-/4-wire selection for 3-phase power supply

• Input range selection

 

K8AB-TH Temperature Monitoring Relay

 

Temperature Monitoring Relay

K8AB-TH

 

View K8AB-TH Product Page >>

 

 

Selection Guide

 

Click here to view K8AB Series Selection Guide.

 

Features

 

Slim 22.5-mm Design Features Two SPDT Relay Outputs

 

Provides individual over voltage and under voltage settings and outputs 

  1-/3-phase Power Supply 

Two SPDT Relay Outputs. Space saving: Cut by 50% compared to previous models

Many customers require the individual upper and lower limit outputs that are normally available only in larger 45-mm relays. For the first time from any manufacturer, OMRON has achieved this and more in a slim-body design measuring just 22.5 mm. These relays not only offer advantages such as 3-phase power supply compatibility and a resistive load contact capacity of 6 A at 250 VAC, but they also reduce panel production cost because they use 50% less space than previous models.

 

 

 

Pre-alarm Monitoring Mode Provides Advanced Warning (K8AB-VW Only)

Pre-alarm Monitoring Mode Chart

In plants and other sites that operate 365 days a year, unexpected shutdowns must be kept to an absolute minimum. OMRON addresses this with the K8AB-VW featuring a two-level pre-alarm monitoring mode with individual trip outputs and pre-alarm warning settings (H/HH alarm and L/LL alarm). The K8AB-VW makes scheduled maintenance viable because the pre-alarm monitoring mode provides advance warning of impending trip alarms.

 

 

Expanded Setting Range Ensures Over Voltage and Under Voltage Monitoring Flexibility

 

Example: K8AB-PW 3-phase Voltage Relay

 

The highly restrictive voltage settings that posed such a problem in the past are no longer a concern. OMRON's new Relays offer full-span over voltage and under voltage range settings for unprecedented voltage monitoring flexibility.

 

 

Single K8AB Monitors 3-phase Power Supply with 3 or 4 Wires

 

Phase to phase voltage (3 wires); Phase to neutral voltage (4 wires)

A Single K8AB Can Monitor a 3-phase Power Supply Anywhere in the World

OMRON Low-voltage Monitoring Relays can be used to monitor 3-phase power supplies with 3 or 4 wires simply by changing DIP switch settings.

 

 

Operation Level Indication by Flashing Alarm Indicator

Graph: Notification by Flashing Alarm IndicatorThe trip alarm operates when the input reaches the operation range and the preset operation time has elapsed.

Checking the operating status has never been convenient because of the time it takes to reach the preset operation time. The K8AB eliminates this problem by featuring a flashing alarm indicator that clearly indicates the operating status. This has greatly simplified the task of checking on-site status particularly when operation settings are changed or an error occurs.

 

 

 

Application Examples

 

Chain Breakage Protection for Conveyors K8AB-AS

The K8AB-AS offers effective chain protection because it starts operating in 0.1 s or less.

 

 

Protection against Idle Running of a Submersible Pump K8AB-AS

The K8AB-AS can detect idle pump operation by detecting under current levels.

 

 

Bulb Burnout Detection K8AB-AS

The K8AB-AS can detect burned out light bulbs by detecting under current levels. The Relay's sensitivity can be adjusted to detect burned out light bulbs even in applications where multiple light bulbs are used.

 

 

Battery Voltage Checking K8AB-VS

The K8AB-VS can detect when the battery charge is low.

 

 

Monitoring the Control Power Supply at Communication Bases K8AB-VW

It can also output individual over voltage and under voltage alarms using SPDT relays, and can provide a pre-alarm warning output to eliminate system down time.

 

 

Monitoring Phase Sequence/Phase Loss for Escalators K8AB-PH

A single K8AB-PH can detect the phase sequence or phase loss at startup and during operation.

 

 

Monitoring Compressor Power Supplies K8AB-PM

A single K8AB-PM can monitor over voltage, under voltage, the phase sequence and phase loss in 3-phase voltage. It can also output individual alarms for over voltage or under voltage using an SPDT relay. The K8AB-PM is able to recognize which alarm has occurred.

 

 

Monitoring Voltage Generated by Wind-powered Generators K8AB-PW

A single K8AB-PW can be used for a 3-phase power supply with 3 or 4 wires. It can be used to individually set and output over voltage and under voltage alarms.

 

 

Monitoring Generated Voltage K8AB-PW

A single K8AB-PW can monitor 3-phase voltage. It can also output individual alarms for over voltage and under voltage using SPDT relays becuase it features two outputs with SPDT relays. The voltage measurement range can be switched from 200 to 480 VAC and the K8AB-PW can be switched to monitor phase voltage or line voltage.