Specifications

C1
GE Limitamp
®
Medium Voltage Motor Control
5kV Load-break Switches
C
Introduction
IC1074 load-break switches are manually operated three-
phase, single-throw disconnecting switches with an integral
interrupter and stored-energy spring that has the capability
of interrupting magnetizing and load current within the ratings
shown in Table C.1. They are designed and tested to comply
with the performance requirements of ANSI C37.57 and C37.58.
The IC1074 600-ampere drawout switch is designed for stab
connection at line and load terminals. This switch must be
fused. Current-limiting fuses are available up to a continuous
rating of 630 amperes for installation in the switch.
Figure C.1 1200-ampere stationary load-break switch
The switch is designed to accommodate the bolt-on version
of the current-limiting fuse, but clip mounting is available.
Construction may be either one- or two-high, with one-high
in a rollout design instead of drawout. Either two switches or
a combination switch and 5kV air-break starter can be
mounted in a two-high enclosure.
The IC1074 stationary switch (600- or 1200-ampere) is
designed for mounting in one-high construction only. It
contains line- and load-terminal pads for bolting incoming
and outgoing conductors directly to the switch. It may be
supplied fused or unfused. If supplied as an unfused switch,
an upstream circuit breaker with instantaneous trips must
be available to coordinate with switch capabilities — or the
switch must be supplied with key lock capabilities — for all
of the Limitamp starters in the lineup. For the 1200-ampere
switch, fuses are available up to 960 amperes continuous.
These large fuses must be applied as line protectors for short
circuit only, relying upon branch circuits or backup overload
protection by other means.
Drawout switches must be applied as feeders only. The fixed
mounted switches may be used as incoming switches or
feeder switches.
These switches are designed specifically for use with Limitamp
control. They are available with 1000- or 2000-ampere AC
main power bus within the enclosure for easy lineup with
Limitamp starters. 3000-ampere is available with extra
depth.
Other features of these switches are:
• Viewing window to see condition and position of switch
blades.
• Blown-fuse indicator that can be seen through view window.
• Bolted fuses available for maximum reliability.
• High reliability interruption.
• Available with key-type interlocks. Maximum of three keys
per position (lock open or lock closed).
• Outside door interlocked directly to operating shaft to
prevent opening with switch energized.
• Externally operated handle that activates spring-charged
quick-make/quick-break mechanism.
• Easy inspection.
• High mechanical life.
• UL available in stationary switches only.