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FH series auxiliary switch

Rated Voltage:DC220V AC220V

Rated Current:6A

Conventional Thermal Current:

Breaking Capacity:DC220V/2A , T0.95 :6P=300ms ,AC220V/6A , Cosφ=0.4

Ambient Temperature:-40℃~+70℃

Withstand Voltage:2500V(50Hz) /1min

Life Cycle:20000次



General Instruction

FH series auxiliary switch, contains features of auxiliary switch and transfer switch, is one of the auxiliary components for the set of high-voltage equipments. Compared to the traditional auxiliary switch, FH series switch is capable of more flexible controlling of contacts` angles and can be combined freely to meet customers` demands. And compared to manual operating transfer switch, FH series auxiliary is more convenient to joint with the actuating mechanism and realize mechanical transmission control functions. The FH series auxiliary switch is applicable both for controlling of switch on & off,interlocking,signal circuits of the high-voltage switch driving mechanism and conversions or group 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.


Meaning of the Symbol  


E.g.: Model no. FH-28C01 means FH series, 28 poles, screw connection mode, 
14 NO contacts and14 NC contacts.

Technical Parameters

額定電流 Rated current


約定發熱電流 Conventional thermal current



Rated voltage

直流 DC

交流 AC




開斷容量 (>1°/ms

Breaking capacity(>1°/ms)

T0.95 6P=300ms





工頻耐壓 Withstand voltage

2500V(50Hz) /1min

機械壽命 Life cycle



Structure Features
FH series auxiliary switch is made up of multi-units with same structures. The contact adopts pure silver alloy; the moving and stable contact are made of pure copper, and the insulation plate is made of superior inflaming retarding material with high strength, good insulation property and heat-resistance.

Working Principles
FH series auxiliary switch adopts indirect driving structure, it is working by square shaft to drive the cam wheel rotated, which in turn to push rod of switch to cause the moving of the contacts, thus to realize the control of the switch on & off function of the electric circuits.


Installation and Operation
1.Please refer to switch draft for mounting dimension.
2.The auxiliary switch should be installed to the target objects by fixing the front end plate with four screw holes and extended screw rod. The switch itself should not be subject to external force; otherwise, it will become deformed and not able to work normally;
3.The serial numbers of contacts could be customized, and the switch operation should be within effective angles.
4.The rotating handle should not be subject to radial force, otherwise it will cause bending of the shaft thus affects its normal operation.
5.Lead wire for auxiliary switch could either adopts plate mode or screw connecting method.

Ordering Information
1.Pls indicate product name, specification & model No., quantity; 
2.Pls make sure the dimension of switch, work route and breaking
of contacts etc.
3.Other requirements.


Construction Drawing

n=insulation plate quantity;L,L1, L2=customer's requirements