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General Instruction

FB series auxiliary switch is one of the auxiliary components for the set of high

voltage equipments, and applicable both for controlling switch on & off

functions, interlocking, and signal circuits of the high-voltage switch driving

mechanism and conversions or group switches. The high switching capacity

effectively surmounts the weaknesses of other auxiliary switches, such as

limited switching capacity, short life-time of contacts. The working life of FB

series auxiliary switch is obviously extended and makes it to be the valid

substitute of similar variety of auxiliary switches.

Service Condition

1.Ambient temperature:-40℃~+70℃.

2.Altitude:the installation spot is supposed not to exceed 5000m.

3.Humidity:the average value of relative humidity is max 95%, the average

value of vapor pressure is max 2.2kPa in condition within 24 hours.the monthly

average value of relative humidity is max 90%, the monthly average value of

vapor pressure is max 1.8kPa.

4.Vibration acceleration is max 15m/s².

5.There should be no evident air pollutions from dust, smoke, corrosives and

combustible gas, vapor or salty fog.

Structure Features

FB series auxiliary switch is made up of multi-units with same structures. The

contact point adopts pure silver alloy; the stable and moving contact plates are

made of good brass, and the insulation plate is made of superior inflaming

retarding material with high strength, good insulation property and heat

resistance. Moreover, the reasonable structure of the switch ensures excellent

dust-proof effects. The FB series auxiliary switch adopts plug in connection

method. The pole quantity of this kind of auxiliary switch could be freely chosen

by customers.

Working Principles

FB series auxiliary switch adopts indirect driving structure, the cam wheel

drives to rotate the shaft, which in turn to push the connection rod of switch to

cause the movement of contacts, thus to realize controlling of switch on & off

functions of the electric circuits .

Installation and Operation

1.Please refer to the switch draft for mounting dimension..

2.The auxiliary switch should be mounted to the target objects by fixing each

two extended screw shafts at both of sides of the end plates. The main body

and the switching shaft of auxiliary switch should not be subject to external

force; otherwise, it will become deformed and not able to work normally;

3.O-shaped or U-shaped terminals led out from the equipment are used to

connect switches. And the terminals are located on the switches by screws

with tightening torque up to 4 N.m applied.