Switch Fuses:

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Switch Fuses

• Safety, Reliability, Economy

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1. Superior short circuit protection
The fuse is a superior short circuit protecting
device in regard to its maximum cut-off
current. In addition a fuse interrupts a short
circuit current very quickly, consequently the
energy let through (I2t) of a fuse is very low.
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2. Economical life time cost
Life time cost of fuse systems is low. After
fault interruption, only the fuse link has to be
changed. Plant down-time and maintenance are
reduced because the fuse link can be rapidly
changed.
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3. Easy selectivity, no need for calculation tools
Fuse links provide a simple procedure for
selecting the right fuse for the installation.
If the ratio between fuse ratings is 11,6,
complete and reliable discrimination can be
easily and cheaply achieved. Using different
brands gives no design limitations.
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4. Replacement after a fault gives 100 integrity
In the event of a fault the protective device has
to open the circuit. A specific feature of a fuse
is that this is done without using mechanical
moving parts. In case of a fault, a fuse always
opens the circuit. It blows, and when replaced
the circuit is protected in exactly the same way
as before the fault occurred.
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5. Co-ordination for motorstarters
The aim of successful co-ordination is to ensure
adequate protection against short circuits and
discrimination between the starter and the short
circuit protective device. The low I2t let
through of the fuse link will protect the thermal
overload relay, while the low peak let through
current of the fuse link protects the contactor
contacts from welding. With fuses, the maximum
let through energy and cut-off currents are low,
resulting in relatively small motor starter
combinations at a high prospective short circuit
current levels.
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6. Environmental-friendly technology
A number of fuse manufacturers established in
1995 a non-profit association known as
NH/HH-Recycling. It enables customers of the
member companies to have used fuse links disposed
of by environmental means.
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SUMMARY
1. Superior short circuit protection 2.
Economical life time cost 3. Easy selectivity, no
need for calculation tools 4. Replacement after a
fault gives 100 integrity 5. Simple
co-ordination for motor starters 6.
Environmental-friendly technology
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