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Instruction Leaflet IL01906008E
Effective March 2011
Instructions for Testing Magnum DS
Digitrips with the MTK2000 Test Kit
EATON CORPORATION www.eaton.com
2.2 Digitrip Long Time Function
Testing of the Trip Unit must be performed with the Trip Unit properly
installed in the breaker. The Long Time function has a memory cir-
cuit with a reset time of 36 times the Long Delay Time. The thermal
memory jumper may need to be relocated to disable the thermal
memory. This jumper is shipped from the factory in the “active”
position. (Reference Section 2.3, MTK2000 Breaker Cables) If a trip
function LED on the Trip Unit is lit prior to a test, press the Trip Reset
pushbutton on the Trip Unit. When bench testing a breaker wired for
zone interlock applications, MDS shorting plug 8779C02G06 should
be installed. (Reference Section 2.3. MTK2000 Breaker Cables)
2.3 MTK2000 Breaker Cables
The MTK2000 MDS Breaker Cable is used to connect the MTK2000
to the breaker’s trip unit. Before the MDS 14 pin MTK2000 plug is
inserted into the Digitrip verify the Long Time Memory (LTM) jumper
is in the inactive position, or it is removed. If it is in the active posi-
tion, it must be removed or returned to the inactive position before
the adapter connector can be inserted. It is important to note that
all tests must be performed with the LTM jumper in the “inactive”
position.
ote:N A physical jumper is used with 520 – 520MC Digitrips.
The 1150 is set differently than the 520 Digitrips; there is no LTM
jumper, the “Long Memory” function must be set to off.
Figure 2. Magnum Test Port
2.4 Zone Interlock Shorting Plug
The Zone Interlock Shorting Plug for the Magnum breaker
(8779C02G06) is required when the breaker is removed from the
switchgear cell for testing. The Shorting Plug must be installed on
the breaker secondary contacts to defeat zone-interlock wiring.
Figure 3. ZSI Shorting Plug
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