KLSR Series -
UL Class RK1 Fast-Acting Fuse KLSR series RK1 fuses were the earliest type of current-limiting fuse
developed. Their single-element, silver link design enables them to
provide fast-acting overload and short-circuit protection. When used to
protect inductive loads such as motors, solenoids, and transformers,
KLSR series fuses must be greatly oversized to prevent opening the fuses
on harmless inrush currents. In such applications, KLSR series fuses
may only provide short-circuit protection.
We recommend using POWR-PRO™ LLNRK/LLSRK series RK1, dual-element,
time-delay fuses in all new applications requiring the current-limiting
ability of UL Class RK1 fuses, or in existing applications where
fast-acting RK1 or RK5 fuses have been opening on harmless system surges
such as motor starting currents.
Applications:- Resistance heaters
- Lighting circuits
- Non-inductive loads
- Molded case circuit breaker load centers and
panelboards have increased interrupting ratings when “series rated”
with Littelfuse KLNR/KLSR Class RK1 fuses. Refer to panelboard
manufacturer’s literature for UL Listed combination of fuses and
panelboards. Series ratings up to 200,000 amperes are available.
Safety:- 200,000 A.I.R. — Reliable interruption of all overcurrents up to 200,000 amperes.
- Extremely current limiting — Stops damaging short-circuit current faster than any mechanical protective device.
- Fast-acting — Provides fast-acting
protection to equipment such as variable speed drives, rectifiers and
other equipment containing surge-sensitive components.
Longer Equipment Life:- Current-limiting design reduces damage to equipment caused by heating and magnetic effects of short-circuit currents.
Economical:- Extremely current-limiting — often permits use of readily available, less costly equipment.
- Used as input or output fuses for
surge-sensitive components, such as variable speed drives and
rectifiers, fast acting KLNR/KLSR fuses may prevent opening of expensive
semiconductor fuses protecting individual components.
Easy to Use:- 200,000 A.I.R. rating minimizes need for short circuit calculations.
Dimensions:- Refer to FLNR for KLNR dimensions and FLSR for KLSR dimensions.
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