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HR3 Series Fuse Knife Switch
I. Scope of Application
The HR3 Series Fuse Knife Switch (hereinafter referred to as “switch”) is
suitable for industrial and commercial power distribution systems with AC 50
Hz, rated voltage of 380 V and conventional thermal current up to 1,000 A,
and is used for the overload and short-circuit protection of cables, conductors
and electrical equipment. Under normal circumstances, the circuit can be
manually switched on and off infrequently. In the case of short circuit, the
fuse is blown to cut off the current.
With simple structure and convenient operation, the switch complies with
GB/T14048.3 and IEC60947-3, and is the most ideal combined electrical
appliance used to replace the knife switch and fuse in various low-voltage
distribution devices.
II. Normal Working Conditions
1. Ambient air temperature: The temperature shall not be higher than
+40°C and lower than -5°C, and the average value within 24 hours shall
not 35°C.
2. Altitude: The altitude of the installation location shall not exceed 2,000
meters.
3. Relative humidity: The relative atmospheric humidity shall not exceed
50% when the maximum ambient temperature is +40°C, and a higher
relative humidity is allowed at a lower temperature (for example: 90%
humidity at +20°C), but the occasional condensation on the switch
surface due to temperature changes shall be considered.
4. Contamination grade of the surrounding environment: Grade 3.
5. Installation category: III.
6. Installation conditions: The switch shall be installed vertically in a place
without significant shaking, impact or vibration and in a medium without
explosion risks, or enough gas or dust to corrode metals or destroy the
insulation.
7. Please consult with our company for the use occasions under abnormal
working conditions.
