The K3TX-VA21B is an Omron panel meter, classified under Measurement and Indicators in the Automation and Control Systems category. It is a panel-mount indicator used to display process values such as voltage, current, temperature, or frequency in control cabinets and operator stations.
This part is in a mature lifecycle stage. It is not flagged as obsolete, but it is not a current-generation active product. Source to order against an RFQ.