Signal lamp is an electronic device designed to provide current information on the state of the three-phase mains.
The loss of voltage in a particular phase (L1, L2, L3) turns off the LEDs assigned to this phase.
As optical elements in the device, used low-current red LEDs, which makes the indicator informs
the user about the existence of voltage even when it is almost "residual" (this is particularly important for the safety of the user).
Unlike other products which are used in neon lights, SO-330s1 thanks to LEDs has a practically unlimited service life.
Not without significance is the fact that while the SO-330s1 gets small amount of electricity (no heating effect of the device).
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