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K8AB
Eight slim models featuring a variety of innovative new functions
Data Sheet (Overview) (965KB)
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Slim 22.5-mm Design Features
Two SPDT Relay Outputs
(K8AB-VW, K8AB-PM, and K8AB-PW)
Provides individual over voltage and under voltage settings and outputs.
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.
Note:The relay output capacity for the K8AB-TH is 3 A at 250 VAC (resistive load).
Usable as a Simple Sensor Controller
Accepts inputs of 4 to 20 mA or 0 to 10 V.
Compatible with Commercial CTs
The K8AB-AS 1-Phase Current Relay can be used with commercial CTs for current measurement.
Note:OMRON-compatible CT: K8AC-CT200L Only the K8AB-AS3 can be used for AC operation at both 100 and 200 A.
DIP Switch Function Selection
Various relay functions can be selected using a DIP switch. This means that the number of models required can be reduced to 1/8 what it had been simply by installing a relay like the K8AB-AS. An added advantage is that it reduces the inventory of maintenance parts.
Note:
1. The operating time can be set to 0.1 to 30 s.
2. SW1 of K8AB-AS is not used.
Single K8AB Monitors 3-phase Power
Supply with 3 or 4 Wires
(K8AB-PM, K8AB-PA, and K8AB-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.
Pre-alarm Monitoring Mode
Provides Advanced Warning
(K8AB-VW Only)
In plants and other sites that operate 365 days a year, unexpected shutdowns must be kept to an absolute minimum. OMRON addresses this problem with the K8AB-VW featuring a pre-alarm monitoring mode that can be set to two levels for two outputs. K8ABVW makes scheduled maintenance possible because the pre-alarm monitoring mode provides advance warning of impending trip alarms.
Expanded Setting Range Ensures Over Voltage and Under Voltage Monitoring
Flexibility
Over voltage and under voltage can be set for the full span of the allowable input range, so over voltage and under voltage can now be monitored with flexibility.
Note:The setting range for operation time can be set within −30% to +25% of the range selected using the DIP switch on the Unit.
Operation Level Indication by 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.
Ideal for Monitoring Current or Voltage
Current Monitoring Applications (Single Phase)
Note:Special CT model: OMRON K8AC-CT200L
Voltage Monitoring Applications (Single Phase)
Wire Connection
2 × 2.5 mm² solid or 2 × 1.5 mm² standard ferrules.
Compliance with International Standards
A third party has certified CE mark compliance. This device is in compliance with UL certification requirements.
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