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8.7.6 Amptector Trip Unit Test Kit
8.7.6.1 General
The Amptector Trip Unit Test Kit consists
of
an
external
power supply, current measuring device, and a precision
timer for field checking the operation
of
the unit. These
three functions have been combined into a single porta-
ble device housed
in
a convenient carrying case. It is
powered from a standard 120 volt, single phase, 60 Hz
outlet; and will furnish the high secondary currents to the
input
of
the Amptector unit to simulate primary fault con-
ditions on the circuit breaker.
8.7.6.2 Description
A long flexible cable terminated by an
11
prong polarized
plug connects to the test terminals
of
the Amptector trip
unit. A second cable connects to the source
of
input
power. Figures 75 and 76 show the tester and operating
controls. The ammeter is dual range and controlled by
the "Hi-Lo" switch.
In
the low range it reads 0-8 amps,
CIRCUIT
SEl.t4'TOR---
SW!TCH
CURil ENT
AOJUST
CONTROi.
---
PO'NE!l
IJllD!CATING
UGHT!RED)
POWER
SWITCH--,.,-...,,-~,,,,
!NSTANTANEOus---------
TESTSMTI:H
1.8. 33-790-11
while the high range covers 0-80 amps. The timer reads
in
seconds with the right hand digit (white)
in
tenths
of
seconds. An external ammeter may be connected
in
the
output circuit through the terminals designated for this
purpose and the shorting link removed.
A CAUTION
WHEN USING THE TEST KIT, THE BREAKER
MUST
NOT
BE
IN
THE CONNECTED POSITION BECAUSE
BREAKER WILL BE TRIPPED AND CAUSE DISRUP-
TION OF SERVICE. IT MAY BE
IN
EITHER THE TEST
OR
DISCONNECTED POSITION,
OR
REMOVED
FROM ITS COMPARTMENT.
8.7.6.3 Operation
The complete testing and calibration
of
the Amptector trip
unit by means
of
the Test Kit is covered by the instruction
sheet
(l.L.
33-791) included with the Test Kit.
LONGOHAY
r-----------ll\lDICIHll\lG
UGHTiCLEAf!l
___
TIMER RESET
PUSHBUTTON
..._
___________
TIMER TEST
PUSHBUTTON
Fig.
75
Amptector Trip Unit Test Kit (For Amptector I-A and ll-A)(391672)
Effective October 1998
Courtesy of NationalSwitchgear.com
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