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Solid state relay, ssr, and scr relays.
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Standard 4-20ma Current Detection Setting Upper and Lower Limit Alarm Control Relay Switch Module RS485 Communication - AliExpress
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Alarm PNP NPN Relay Output Display 4-20mA Electronic Pressure Switch - China Electronic Pressure Switch, pressure gauge | Made-in-China.com
Switch On With A Wholesale 4 20ma solid state relay ssr - Alibaba.com
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Buy 4-20mA to 5V Converter for Arduino Industrial Sensor Interface Board
