KLDR fuses are time-delay fuses specifically
designed for the protection of control transformers, solenoids and
similar inductive components with high magnetizing currents during the
first half-cycle.
They closely match most control power transformer
characteristics, which permits the time delay fuses to be sized in
accordance with the latest revisions of UL 508 (Industrial Control) and
UL 845 (Motor Control Centers).
When the time delay of KLDR fuses is adequate to carry motor
starting current, they provide excellent protection of motor branch
circuits containing IEC or NEMA rated motor controllers or contractors.
Compared to other UL Listed fuses, Class CC time delay fuses are the most current limiting, rating for rating.
Time delay fuses provide this superior
protection in a fraction of the space required by other fuse classes. —
For example, when 600 V three-pole, 30 A Class R fuse blocks are
replaced by Littelfuse Class CC fuse blocks, panel-mounting space is
reduced approximately 70%.
Applications:
Small transformer protection (control power transformers) – KLDR series,
time delay fuses designed to withstand the high magnetizing inrush of
transformers.
Safety:
200,000 A.I.R. — Reliable interruption of all overcurrents up to 200,000 amperes.
Extremely current limiting — Reduces damage
caused by heating and magnetic effects of short-circuit currents…stops
damaging short-circuit faster than any mechanical protective device.
Space Saving:
Class CC time delay fuses are the smallest 600V, 200,000 A.I.R. fuses approved for branch circuit protection.
