Siemens SGIM-3268H - Stationary Contact Assembly

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Replace upper primary stab support with primary bus

extensions. Fasten with four 3/8” hex bolts to the

primary insulator. Use 3/8 bolt, lockwasher and washer

torqued 20-25 ft-lbs.

Align vacuum interrupter stationary contact. Insert

M16 hex bolt through lockwasher, washer, upper stab

support and primary bus extensions. Manually engage

bolt into interrupter by applying hand torque only.

Fasten the insulating support plate to the upper

primary stab support. Use four hex socket flat head

screws. Clean external and internal threads. Apply

“Loctite” Primer T to the external and internal threads.

Apply “Loctite” threadlocker 262 to the external

threads. Engage and torque 8-10 ft-lbs.

14.5. VS15050 Vacuum Interrupter Applied in Circuit

Breakers Rated 1200A (Figure 53).

With interrupter in alignment under stab support,

place the primary extension into the gap between stab

support and interrupter stationary contact. Make sure

contact surfaces are wiped clean.

Replace, finger tight, two 3/8 fasteners joining the

primary extension to the stab support.

Insert an M16 hex bolt through lock washer, washer,

stab support, and primary extension. Align interrupter

stationary contact, and (by hand) engage the M16 bolt.

Fasten two 3/8 fasteners securing the primary exten-

sions (26-36 ft-lbs).

14.6. VS15050 Vacuum Interrupter Applied in Circuit

Breakers Rated 2000 and 3000A (Figure 54) Having

sperate phase barriers..

Allow interrupter to rest on lower stab support.

Replace upper primary bus extension with attached

insulating plates. This component is awkward, so it is

helpful to have an extra person to hold the parts while

the bolts are inserted. Install six (three on each side)

hex socket flat screws to secure the insulating plates to

the lower primary support. Screws should be loose.

Install the upper primary stab support. Fasten with

four 3/8 hex bolts to the primary insulator. Use 3/8

bolt, lock washer and washer torqued to 20-25 ft-lbs.

Connect the upper primary extension to the upper

primary stab support, using two 3/8 socket head

screws, torqued to 12-17 ft-lbs.

Overhaul

13. Slip the flexible shunt clamp over the movable contact

stem of the interrupter. Replace clamp hardware,

bolt(s), washer(s), and nut(s). Raise clamp until it bears

on step or retaining ring 33 to 48mm up from the end

of the stem.

14. Stationary Contact Assembly

14.1. VS12015, VS25002, and VS17006 Interrupters. Align

copper spacer bar with large hole in stab support. Insert

long M12 bolt through lockwasher, washer, stab support

and copper spacer. Align interrupter stationary contact

and (by hand) engage the M12 bolt (Figure 48).

14.2. VS10006 and VS10028 Interrupters in Circuit

Breakers rated 1200A (Figure 47).

With the interrupter in alignment under stab support,

place the primary extension into the gap between stab

support and interrupter stationary contact.

Make sure contact surfaces are wiped clean.

Replace, finger tight, two 3/8 fasteners joining the

primary extension to the stab support.

Insert an M16 hex bolt through lockwasher, washer,

stab support and primary extension. Align interrupter

stationary contact, and (by hand) engage the M16 bolt.

Fasten two 3/8 fasteners securing the primary

extensions (26-36 ft-lbs).

14.3. VS10006 Interrupter in 2000A Circuit Breakers

(Figure 50).

With interrupter aligned under the primary stab, place

the 3/8” copper spacer between primary extensions and

stationary contact of the vacuum interrupter.

Insert the M16 hex bolt through a lockwasher, washer,

stab support, primary extension and 3/8” copper spacer.

Align vacuum interrupter stationary contact, and (by

hand) engage the M16 bolt.

14.4. VS10028 Vacuum Interrupter Applied in Circuit

Breakers Rated 2000 and 3000A (Figure 49).

Allow interrupter to rest on the lower stab support.

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Later in this procedure a trunnion bolt will be inserted and secured. After

this bolt’s insertion and adjustment, the clamp may then be tightened.

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Thread damage will occur if threads are crossed. Be sure the bolt can be