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 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
              │
           colour
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