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5.4.2

Replacement of components

1. Withdrawable assembly:

(Figures 5/2 to 5/6)

• Disconnect plug connector (10.3) (only for

withdrawable assembly of type B)

• Remove interlock rod (13.91) with pin (13.27)

from the withdrawable assembly

• For motorized withdrawable assemblies, re

move the two socket head bolts which are
accessible from below the assembly

• Unbolt the circuit-breaker from the withdra

wable assembly (4 x M12 bolts)

• Mount the circuit-breaker on a new with-

drawable assembly in the reverse order, using
new circlip and special pliers for pin (13.27)

• Check the setting of interlocking rod (13.91):

– Turn spindlel (18) anti-clockwise to the stop

for the disconnected position:

The distance between lever (13.26) and cam

(13.25) must be 2

mm.

The distance between roller (13.24) and blok-

king bracket (13.92) must be 0.2-0.5 mm.

– Turn spindle (18) clockwise to the stop for

the service position:

The distance between lever (13.26) and cam

(13.25) must be 2

mm.

The distance between roller (13.24) and

blocking bracket (13.92) must be 0.2-0.5
mm.

– Loosen bolts (13.91.2 or 13.92.1) for any

necessary adjustment.

or further details on repairs, see also the

relevant sections of manual BA 359.

5.5

Testing withdrawable parts with a VD4 type
circuit-breaker

When functional tests are carried out on withdra-
wable parts, compliance

with

the con ditions listed

below should also be checked. In this context, a
distinction should be made between two types of
the devices for the VD4 withdrawable part:

• Type A: Withdrawable assembly

without

inte-

grated auxiliary switches (manual operation only).

• Type B: Withdrawable assembly

with

integrated

auxiliary switches (manual or motorized operation).

5.5.1

Motor-driven withdrawable parts

(non-standard)
Carry out testing of motor-driven withdrawable
parts in the same way as for manually operated
withdrawable part:

• Turn off the supply voltage (m.c.b.), since the

motor could otherwise be braked electrically.

• Turn hand crank (121) in the required direction.

Note:

When the withdrawable part moves, the motor
turns. The motor functions in such a case like a
generator, i.e. it can lead to reverse voltages in the
terminals.

5.5.2

Checking the correctness of dimensional settings

(Figures 5/2 to 5/6)
1. The distance between lever (13.26) operated by

link rod (13.91) and plastic cam (13.25) should
be

. If adjustment is required, release the

two bolts (13.91.1) and (13.91.2). Deviations from
the specified value can have the following effects:

• Dimensions too large, blocking system for the

drive spindle deactivated.

• Dimensions too small, proper action of the

electrical interlock no longer guaranteed.

2. The distance between roller (13.24) and angle

lever (13.92) should be

0.2-0.5 mm

when the

circuit-breaker is closed.

If adjustment is required, release the two bolts

(13.91.2) and (13.92.1)

5.5.3

Checking auxiliary switch settings on type A with-

drawable parts

(Figure 5/2)
Compliance with the interlock conditions in the areas
of the test/disconnected position and the service
position is ensured by auxiliary switch -S6, located
in the breaker housing and factory-set.
In test operations, the withdrawable part must be
moved by hand with the crank fitted.
1. Settings in the area of the test/disconnected

position

• Move the withdrawable part out of the test/

disconnected position towards the service
position with a few turns of the crank.

• Slowly move the withdrawable part back to

the stop.

Auxiliary switch -S6 must then operate when

the hand crank has a remaining angle of ≥ 60

of turn to reach the stop.

• Slowly insert the withdrawable part from the

test/disconnected position towards the service
position until auxiliary switch -S6 just operates.

In this position, it must still just be possible to

move closing push rod (13.2.1). For this test,
the function of the blocking magnet -Y0 must
be deactivated manually.