molded case circuit breakers - Eaton Canada

PRODUCT DESCRIPTION
Originally a Westinghouse Product
The LF air-break design AMPGARD starter
was introduced in 1962. The LF design
introduced the component-to-component
circuitry concept. This design greatly
reduced the current-carrying connections
and allowed significant space savings.
The 25L2 and 50L2 floor mounted NEMA 1
starters were 26 inches wide x 30 inches
deep x 90 inches high. These 200 ampere
starters could have been mounted two or
three high per structure, respectively.
The 25L4 and 50L4 floor mounted NEMA 1
starters were 36 inches wide x 30 inches
deep x 90 inches high. These 400 ampere
starters could have been mounted two
high per structure.
The 25L7 and 50L7 floor mounted NEMA 1
starters were 40 inches wide x 30 inches
deep x 90 inches high. These 700 ampere
starters were mounted one per vertical
structure.
REPLACEMENT CAPABILITIES
Renewal and Replacement Parts for
LF Design Starters
Refer to RPD 8855A for identifying the
parts needed. Refer to Price/Style Number
Index 8855 for prices by style number and
old style number-to-new style number
cross reference information.
Among the parts available are:
● Current and Potential Transformers
● Control Transformers
● Fuses
● O/L Heaters
● ADM Switches
● Enclosure Parts
Synchronous Control Retrofit Using
Mark V Solid-State Control
Replace existing relay type synchronous
control with state-of-the-art Solid-State
Mark V control. Refer to pages 186-189,
192 of this publication for synchronous
motor field control panels.
Add-on Vacuum Starter Structures
New add-on vacuum structures as an
extension to the LF type starter assembly
may be connected directly to the main bus
without a transition section. Contact your
local Cutler-Hammer Field Sales Office for
more information.
March 2001
STARTERS (MEDIUM VOLTAGE)
LF Air AMPGARD Assemblies,
Retrofit Kits and Renewal Parts
Replacement 50L4 Contactor
Low Resolution Photo
Replacement Air Contactors
New replacement air break contactors are
available for the following ratings: 25L2,
25L4, 50L4, 25L7, 50L7.
Ratings (Max.)
200A, 400A, 700A
2500 HP @ 2500V; 4500 HP @ 5000V
203
Chronology
The LF air-break design starter was introduced
in the early 60s, first with the 2500V,
200 ampere starter, then with the 5000V
design and the 400 and 700 ampere ratings.
The starters were built in Buffalo, NY
until the operation was transferred to
Asheville, NC in 1978, where it was obsoleted
in the late 1980s.
Factory Repair/Refurbishment of
LF and SJ Contactors – Tune-up Service
Cutler-Hammer offers a factory repair and
refurbishment service for Westinghouse
AMPGARD type LF and SJ mediumvoltage
contactors. This is a factory
service using the original manufacturing
techniques, tooling, design and test
specifications. All replacement components
are genuine new Cutler-Hammer
replacement parts. No refurbished, used
or rebuilt parts are used. Contact your
local Cutler-Hammer Field Sales Office
for more information.
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