FN12-12/630, FN12-12R.D/125-31.5 Fuse Load Combination Switch | Indoor High Voltage Load Switch - Fuse Combination Apparatus

Overview

FN12-12D/630-20 indoor AC high voltage load switch (hereinafter referred to as FN12-12D load switch) is a three-phase high voltage switchgear with rated voltage of 12kV and rated frequency of 50Hz, used for making and breaking load current, closed loop current, no-load transformer and cable charging current, and making short-circuit current. The load switch equipped with an earthing switch can withstand short-circuit current. FN12-12/630, FN12-12R.D/125-31.5 Fuse Load Combination Switch adopts the gas-evolving arc extinguishing principle structure, and with current-limiting fuses, has short-circuit protection function, widely used in ring main units and compact substations.

FN12-12R.D/125-31.5 indoor AC high voltage load switch-fuse combination apparatus (hereinafter referred to as FN12-12R.D combination apparatus) is an indoor high voltage switchgear combining FN12-12D load switch and S□LAJ-12 (XRNT□-12) high voltage current-limiting fuse. It can reliably break any current up to short-circuit current; the load switch breaks working current, the fuse breaks short-circuit current, and jointly breaks any overcurrent between working current and full short-circuit current. At the same time, the fuse opens the load switch through its striker.

Service Environment Conditions

• Ambient air temperature: upper limit +40degC, lower limit -25degC;
• Altitude: 1000m and below;
• Relative humidity: monthly average not greater than 90%, daily average not greater than 95%;
• Surrounding air shall be free from obvious pollution by corrosive or flammable gases, water vapor, etc.;
• No frequent violent movement;
• Pollution class: Class II.

If the service conditions exceed the above provisions, the user and manufacturer shall negotiate to determine.

Model and Designation

Main Technical Parameters

Outline and Installation Dimensions

Ensure that FN12-12R.D/125-31.5 Fuse Load Combination Switch FN12-12D series are puffer type gas-evolving arc extinguishing. During installation, check that the arc chute is clean without carbonization, the contact engagement depth is not less than 15mm, the fuse holder has sufficient elasticity and does not loosen easily, and the operating mechanism opening/closing indication is clear...