SECTION 1-lntroduction
1.1-General lnformation
These instructions cover installation of the MicroVersaTripTM
solid-state, trip-device, conversion kits on the AK/AKR-75/1 00
and AK/AKS-50 breakers listed in Table 1-1. Each kit contains
the necessary material to convert from existing EC, Power
Sensor, ECS or SST trip device systems.
Kit installation is straightforward but does require careful
workmanship and attention to these instructions. Familiarity
with the breaker itself is highly desirable. The general
approach is to first strip the breaker of its existing trip
devices, then install the MicroVersaTripTM components.
Following this procedure, the converted breaker is perfor
mance tested, prior to restoring the breaker to service.
For the majority of breaker models listed in Table 1-1, kit
installations do not require any customized assembly work.
However, some conversions may involve unusual mounting
circumstances or accessory combinations which necessitate
minor modification/relocation of a component(s). In most
instances this supplementary work can be done on site.
Preparatory to beginning the conversion, the installer should
verify that the correct kit, current sensors and programmer
unit have been furnished-see Tables 1-2 through Table 1-5.
Whenever the Ground Fault trip element is furnished for
breakers applied on 4-wire systems, note that, in addition to
Table 1-1-Basic MicroVersaTrip™
Conversion Kits
Cat. No. 343L821G
Drawout
Stationary
Breaker
With
Without
With
Without
Type
4th Wire
4th Wire
4th Wire
4th Wire
Ground
Ground
Ground
Ground
Fault
Fault
Fault
Fault
AK-50 AKT-50
4
5
6
5
AKU-50
AKS-50 AKST-50
1 1
1 2
1 3
1 2
AKSU-50
AK-75
7
8
N/A
N/A
AK-1 00
9
1 0
N/A
N/A
AKR-75
23
24
25
24
AKR-1 00
1 7
1 8
1 9
1 8
AKR-W-1 00
20
21
22
21
N/A-Not Available
installing the kit on the breaker, an associated neutral sensor
(CT) is required for separate mounting in the equipment.
Insure also that retrofitted breakers are applied within their
short circuit ratings; for example, assuming that as part of a
conversion the breaker's trip elements are to be changed
from Ll to LS, then the short time rating would govern
the application.
As a service related consideration, the installation of the
MicroVersaTripTM kits provides an excellent opportunity to
perform normal maintenance on the breaker proper, particu
larly while the front and back frames are separated. Such
procedures are described in the Maintenance Manuals listed
in Table 1-6. Also, any renewal parts required are listed in the
Renewal Parts Bulletins given in Table 1-6.1f required, copies
of these publications are available from the factory.
NOTE:
Although designed specifically for the
breaker models in Table 1-1; these kits in many
instances can be employed for conversion of
the earlier AK-1-50/75/1 00 types. Undertaking
such conversions should be a local decision and
may involve additional modification depending
upon the breaker's vintage and its accessory
complement.
Table 1-2-Neutral Sensors
Breaker Frame
Sensor Ampere
Cat. No.
Size
Range
300-800
TSVG508BK
1 600
600-1 600
TSVG516BK
2000
800-2000
TSVG620BK
3000
1 200-3000
TSVG830BK
3200
1 200-3200
TSVG832BK
4000
1 600-4000
TSVG940BK
3
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