1 General:
DNH5 series fuse type disconnecting switch is applicable in the
circuit of rated voltage AC 660V and below, rated current
AC160A-630A, rated frequency of 50Hz. In the power distribution
system of industrial enterprises, it is mainly used in distributor
circuit and motor circuit with high short-circuit current for
infrequency manual making, breaking and disconnecting the power
supply. However, it is not suitable for starting and breaking of
single motor. This product is according with the standard of
GB14048.3, IEC60947-3.
2 Model meaning:
L：Three phases breaking and making simultaneously S：Independent operating phase by phase |
Conventional thermal current |
3 Normal working and installation conditions:
3.1 Ambient temperature: -5oC~+40oC, the average temperature shall not exceed 35oC in 24 hours
3.2 Altitude: shall not exceed 2,000m
3.3 Pollution condition: grade 3
3.4 Humidity: the relative humidity shall not exceed 50% when the
environmental temperature is +40oC in installing place. And the
relative humidity may be higher at the lower temperature condition,
the maximum humidity can up to 90% at +20oC
2.5 The product shall be installed in the place without rain and
snow, without remarkable shake and quiver
2.6 The switch shall be installed vertically
4 Structure and features:
The switch is consisted of underpan, base, cover, handle and
shield. NT series fuse link is installed in the cover to act as
knife of active contact: the handle moves fan-shapely based on the
pivot of underpan, makes the cover and fuse make and break
together, it is with enough space and remarkable disconnection
point which meets the requirement of isolating switch. And it is
convenient to dismount the base and underpan, which is easy to
mount the base to the bus bar safely and reliably. There is arc
extinguisher on the underpan, which ensures breaking capability of
the switch.
