It is used for manual start of smoke exhaust systems. It works in the alarm loop of the following control and monitoring units: S2000-4, Signal-20P, S2000-ASPT, Signal-10, Signal-20M or similar, providing the loop voltage up to 30 V and limiting the loop current at the level of no more than 25 mA. Functions: monitoring the state of the key; transmission of notices to the receiving and control unit (device); indication of operating modes (the state of the key) on the built-in light indicator.
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