vinod
Senior Member
- Location
- Saudi Arabia
Please give me some explanations about the types of fuses ex. Type 1E, 12R etc.
Type of fuses
- Thread starter vinod
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davidr43229
Senior Member
- Location
- Columbus, Oh
Current-limiting ?E? and ?R? rated fuses are equipped with a mechanical indicator or striker pin that protrudes through the
fuse cap upon operation of the fuse. This provides visual identification of a blown fuse and can be used as a trigger for external devices.
?E? rated fuses are considered to be general purpose fuses and can be
used to protect against low and high values of fault current. ?R? rated
fuses are designed for back-up protection. They must be used in series
with other devices such as motor overload relays in order to achieve
both overload and short-circuit protection.
Medium voltage fuses are not intended to provide overload protection in
the same sense as fuses rated 600 volts or less. Medium voltage fuse
current ratings do not have the same meanings as the ampere ratings of
low voltage fuses.
?R? rated fuses provide required short-circuit protection for medium
voltage motors, motor controllers and associated circuitry. These
components have limited ability to absorb the energy of large shortcircuit
currents. Medium voltage motor controllers contain overload
relays which provide both overload protection and locked rotor
protection to the motor. The controllers are also intended to interrupt
low value short-circuits within the capability of the motor controller. This
protects the medium voltage fuse from sustained overcurrents which
are less than their minimum interrupting rating.
NEMA Standards for ?R? rated medium voltage power fuses require
they operate within 15-35 seconds when subjected to an rms current
100 times the ?R? rating. For example, a fuse with a 2R rating will open
within 15 to 35 seconds on an applied current of 2 x 100 = 200 amperes.
Just my $.02
fuse cap upon operation of the fuse. This provides visual identification of a blown fuse and can be used as a trigger for external devices.
?E? rated fuses are considered to be general purpose fuses and can be
used to protect against low and high values of fault current. ?R? rated
fuses are designed for back-up protection. They must be used in series
with other devices such as motor overload relays in order to achieve
both overload and short-circuit protection.
Medium voltage fuses are not intended to provide overload protection in
the same sense as fuses rated 600 volts or less. Medium voltage fuse
current ratings do not have the same meanings as the ampere ratings of
low voltage fuses.
?R? rated fuses provide required short-circuit protection for medium
voltage motors, motor controllers and associated circuitry. These
components have limited ability to absorb the energy of large shortcircuit
currents. Medium voltage motor controllers contain overload
relays which provide both overload protection and locked rotor
protection to the motor. The controllers are also intended to interrupt
low value short-circuits within the capability of the motor controller. This
protects the medium voltage fuse from sustained overcurrents which
are less than their minimum interrupting rating.
NEMA Standards for ?R? rated medium voltage power fuses require
they operate within 15-35 seconds when subjected to an rms current
100 times the ?R? rating. For example, a fuse with a 2R rating will open
within 15 to 35 seconds on an applied current of 2 x 100 = 200 amperes.
Just my $.02
vinod
Senior Member
- Location
- Saudi Arabia
Thanks alot Mr.david. The explenations are MORE than enough for me.....
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