Eaton Cutler-Hammer AMPGARD User Manual

Effective 6/98
I.B. 48017
Cutler-Hammer
Instructions for Converting AMPGARD
™
Type LFM
Isolation Switch With Type 25LFR2 Design
This kit was specifically designed to replace old type LFM
isolation switches supplied prior to July, 1975, with new
type 25 LFR2 isolation switches. The shutter assembly
has been moved from the isolation switch to the starter
cell. This provides an insulating barrier over the line stabs
when the isolation switch is removed from the enclosure.
This industrial type control is designed to be installed,
operated, and maintained by adequately trained workmen.
These instructions do not cover all details, variations, or
combinations of the equipment, its storage, delivery,
installation, checkout, safe operation, or maintenance.
Care must be exercised to comply with local, state, and
national regulations, as well as safety practices, for this
class of equipment.
Make certain that the incoming line breaker is locked open
and the connections to the line stabs have been de-
energized before any work is started on removal of old
parts.
Also check all auxiliary power circuits into the enclosure.
REMOVAL OF OLD PARTS
1. Rotate the isolating switch handle counter-clockwise
90° to the open-door position.
2. Loosen door fasteners and open doors.
3. Remove the main power fuses and the contactor
phase barriers.
4. Remove the contactor from the enclosure per instruc-
tions in I.L. 11-202-14 under “Maintenance and
Repair”.
5. Remove two .312 inch-18 x 1.00 inch Allen head cap
screws holding the isolation switch in place. Save
hardware.
6. Disconnect the auxiliary switch connections from the
terminal block if an auxiliary switch was originally
supplied.
7. Slide the old isolation switch out of the enclosure.
8. If any mechanical interlock linkage was supplied as
part of the original isolation switch, this linkage should
be transferred to the new switch using the holes
provided. Special care must be taken to properly
adjust the linkage so the complete mechanical
interlock system functions as originally intended.
9. See Fig. 1. Remove the 16-inch long glass polyester
line stab finger barrier that is held in place with two
.312 inch-18 hex bolts. Dispose of the hardware and
the finger barrier.
Fig. 1 Existing Line Stab Finger Barrier

Eaton Cutler-Hammer AMPGARD Specifications

General

Brand	Eaton
Model	Cutler-Hammer AMPGARD
Category	Switch
Language	English

Summary

Removal of Old Isolation Switch

Disconnecting and Removing Switch

Remove main power fuses, contactor phase barriers, and contactor. Disconnect auxiliary switch connections.

Handling Mechanical Interlock Linkage

Transfer mechanical interlock linkage to the new switch, ensuring proper adjustment for intended function.

Removing Finger Barrier

Remove the glass polyester line stab finger barrier secured by hex bolts and dispose of it.

Installation of New Isolation Switch Components

Mounting Line Stab Molded Barriers

Install L.H. and R.H. line stab molded barriers using provided hardware, ensuring correct positioning.

Attaching Shutter Assembly

Assemble and mount the shutter assembly, aligning keyholes with screws and securing properly.

Connecting Shutter Operating Lever

Connect the shutter operating lever to the shutter assembly and top front channel using specified hardware.

Lubricating Contact Surfaces

Apply light coating or silicone grease to the contact area of line stabs for easier operation and protection.

Securing New Isolation Switch

Slide the new isolation switch into the structure and secure it with socket head cap screws.

Final Assembly and Checks

Reinstalling Contactor and Components

Reinstall contactor, phase barriers, fuses, and low-voltage control plug.

Verifying Mechanical Interlock

Ensure the mechanical interlock between the isolation switch and contactor functions correctly before energizing.