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Designed to optically signal the presence of voltage in a electrical circuit.
Functioning
The presence of voltage in the circuit is indicated luminous LED.
 
Implementation
| Type | LED Colours | 
| LK-712 G | 1× green | 
| LK-712 Y | 1× yellow | 
| LK-712 R | 1× red | 
| LK-712 B | 1× blue | 
Order labelling method
LK-712   B  30÷130V  ——  supply
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          colour
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