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Product Index :: Industrial Components ::

Level/Monitoring Devices :: Measuring & Monitoring Relays

K8AB Series Measuring and Monitoring Relays

* Ordering information
* Specifications
* Configurations
* Dimensions, and etc

can be found in our PDF brochure.

Two SPDT Outputs Available in Models DIN Sized at 22.5 mm.

Industrial manufacturing facilities and equipment today require more precise risk management and maintenance than ever before.

OMRON has responded with DIN-sized (22.5 mm) Low-voltage Monitoring and Liquid Level Control Relays. Eight slim models featuring a variety of innovative functions offer accurate current and voltage monitoring to avert manufacturing line problems.

» Inquiry

Product Lineup:

• Single-phase Power Monitoring

• 3-phase Power Monitoring

• Temperature/Level Monitoring

Application Examples:

Protecting

Conveyor Chain Breakage

Against Idle Running of a Submersible Pump

Monitoring

Bulb Burnout

Battery Voltage

Control Power Supply at Communication Bases

Phase Sequence/Phase Loss for Escalators

Compressor Power Supplies

Voltage Generated by Wind-powered Generators

Generated Voltage

Benefits/Features:

• Two SPDT Relay Outputs in a Slim Design

• 3-/4-wire Selection for 3-phase Power Supply

• Advanced Warning

• Flexible Voltage Monitoring

• DIP Switch Function Selection

• Flashing Alarm Indicator

Product Lineup

Single-phase Power Monitoring:

K8AB-AS 1-Phase Current Relay

Single-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

Single-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

Single-Phase Voltage Relay

K8AB-VW

• Over and under voltage

• Pre-alarm warning mode

• ON delay and operation time

3-phase Power Monitoring:

K8AB-PH 3-Phase Sequence, Loss Relay

3-Phase Sequence, Loss Relay

K8AB-PH1

• Fixed phase Asymmetry monitoring

• 200 to 500 VAC with a single K8AB-PH1.

• 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

Temperature/Level Monitoring:

K8AB-TH Temperature Monitoring Relay

Temperature Monitoring Relay

K8AB-TH

• Temperature alarms and monitoring

• To monitor abnormal temperature and protect equipment

More about K8AB-TH »

61F-D21T-V1 Conductive Level Controller

Conductive Level Controller

61F-D21T-V1

• Level control for industrial equipment

• Outputs can be set to self-hold at ON or OFF

• With sensitivity adjustment

More about 61F-D21T »

Current Monitoring Applications (Single Phase)

Application	Measured current	Operating value setting range	Applicable models
Simple Sensor Controller	4 to 20 mA DC	2 to 20 mA AC/DC	K8AB-AS1
		10 to 100 mA AC/DC
		50 to 500 mA AC/DC
Process control signal monitoring (using a standardized CT)	0 to 1 A AC 5 to 5 A AC	0.1 to 1 A AC/DC	K8AB-AS2
		0.5 to 5 A AC/DC
		0.8 to 8 A AC/DC
Current monitoring for motors and heaters (using a special CT)	0 to 200 A AC	---	K8AB-AS3 (Special CT model: K8AC-CT200L)
		10 to 100 A AC/DC
		20 to 200 A AC/DC

Voltage Monitoring Applications (Single Phase)

Application	Measured voltage	Operating value setting range	Applicable models
Direct current monitoring (monitoring the output voltage of a shunt)	0 to 60 mV DC 0 to 100 mV DC 0 to 150 mV DC	6 to 60 mV AC/DC	K8AB-VS1 K8AB-VW1
		10 to 100 mV AC/DC
		30 to 300 mV AC/DC
Power supply line monitoring	12 VDC 24 VDC 100 VAC 115 VAC	1 to 10 V AC/DC	K8AB-VS2 K8AB-VW2
		3 to 30 V AC/DC
		15 to 150 V AC/DC
	200 VAC 230 VAC 400 VAC 480 VAC	20 to 200 V AC/DC	K8AB-VS3 K8AB-VW3
		30 to 300 V AC/DC
		60 to 600 V AC/DC

» View K8AB Series Selection Guide

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Benefits / Features

Two SPDT Relay Outputs in a Slim 22.5-mm Design

Provides individual over/under voltage settings and outputs (1-/3-phase Power Supply)

K8AB-VW/-PM/-PW

Many customers require the individual upper and lower limit outputs that are normally available only in larger 45-mm relays. OMRON has achieved this and more in a slim-body design measuring just 22.5 mm.

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

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 its compact size also reduces panel cost.

3-/4-wire Selection for 3-phase Power Supply Using a Single K8AB

K8AB-PM/-PA/-PW

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.

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

Pre-alarm Monitoring Mode Provides Advanced Warning

K8AB-VW

Pre-alarm Monitoring Mode Chart

In non-stop production sites or plants, 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 advanced warning of impending trip alarms.

Flexible Voltage Monitoring

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

Example: K8AB-PW 3-phase Voltage Relay

DIP Switch Function Selection

Various relay functions can be selected using a DIP switch. The number of models required can be reduced to 1/8, reducing the inventory of maintenance parts.

Example K8AB-AS 1-phase Current Relay. * The operating time can be set from 0.1 to 30 s. *SW1 is not used.

Flashing Alarm Indicator

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.

Note: Excluding the K8AB-PH and K8AB-TH.

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

Simple Sensor Controller

K8AB Series accepts inputs of 4 to 20 mA or 0 to 10 V, thus can be used as a simple Sensor Controller.

Compatible with Commercial CTs

K8AB-AS

The K8AB-AS Single-Phase Current Relay can be used with commercial CTs for current measurement.

	CT current on secondary side	Applicable model
Commercial CTs	0 to 1 A AC	K8AB-AS2
Commercial CTs	0 to 5 A AC	K8AB-AS2

Note: Omron-compatible CT: K8AC-CT200L, only the K8AB-AS3 can be used for AC operation at both 100 and 200 A.

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Application Examples

Conveyor Chain Breakage Protection

K8AB-AS Single-Phase Current Relay

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 Single-Phase Current Relay

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

Bulb Burnout Detection

K8AB-AS Single-Phase Current Relay

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 Single-Phase Voltage Relay

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

Monitoring the Control Power Supply at Communication Bases

K8AB-VW Single-Phase Voltage Relay

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-PH1 3-Phase Sequence, Loss Relay

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

Monitoring Compressor Power Supplies

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

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 3-Phase Voltage Relay

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 3-Phase Voltage Relay

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.

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See Related Products:

Temperature Monitoring Relay

K8AB-TH

Compact and Slim Relay ideal for temperature alarms and monitoring.

Conductive Level Controller

61F-D21T-V1

Ideal for level control for industrial facilities and equipment.