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It protects one DC power and two RS-485 serial connections from these incoming surges, which are usually caused by lightning strikes and carried along underground cables. The Click 223 can be used with a number of devices, including the SmartSensor Advance.
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■ The front of the Click 223 has an LED that lights up to indicate the device has power and the surge protection is working properly. If the LED is not lit, either the device has no power or the surge protection is not working.
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