Switch Fuse Unit – [BENLO]

A Benlo TP&N switch fuse unit is     an electrical device that combines a switch and fuses within a single metal enclosure. It is manufactured by Bentec India and is designed for use in three-phase, four-wire electrical systems.

• • TPN

     stands for Triple Pole and Neutral. In a three-phase electrical system, the "triple pole" refers to the three live or phase wires (L1, L2, L3).

  • Neutral (N) refers to the neutral wire, which provides a return path for the current.
  • The switch mechanism operates on all four connections simultaneously, allowing you to completely and safely disconnect a circuit for maintenance or repairs. 

    Function and features :-

• • Isolation and protection: The switch part provides a clear, visible break in the circuit to safely isolate power. The fuses provide overcurrent protection, interrupting the circuit during a short circuit or overload event to prevent damage.
  • Neutral switching: While the fuses protect the three phase wires, the neutral pole is switched but not fused. This is a key feature for ensuring safety, especially in multi-power source systems (e.g., generator and utility).
  • Rugged enclosure: Benlo's switch fuse units are typically housed in a durable, powder-coated sheet steel enclosure with a door, offering protection against accidental contact and environmental factors.
  • Safety interlocks: Many models include a door interlock facility that prevents the enclosure door from being opened when the switch is in the "ON" position, adding an extra layer of safety.Key specifications
    
    When selecting a Benlo TPN switch fuse unit, you should consider the following specifications: 
    • Voltage rating: Standard units are typically rated for 415 volts.
    • Frequency: Designed for 50 Hz systems.
    • Fuse type: Available with either rewirable porcelain fuses or High Rupturing Capacity (HRC) fuses.