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Effective 8/2006
Page 2
I.L. 66A7534H04
WARNING
DO NOT ATTEMPT TO INSTALL OR PERFORM
MAINTENANCE ON EQUIPMENT WHILE IT IS
ENERGIZED. DEATH OR SEVERE PERSONAL INJURY
CAN RESULT FROM CONTACT WITH ENERGIZED
EQUIPMENT. ALWAYS VERIFY THAT NO VOLTAGE IS
PRESENT BEFORE PROCEEDING. ALWAYS FOLLOW
SAFETY PROCEDURES. CUTLER-HAMMER IS NOT
LIABLE FOR THE MISAPPLICATION OR
MISINSTALLATION OF ITS PRODUCTS.
WARNING
OBSERVE ALL RECOMMENDATIONS, NOTES, CAU-
TIONS, AND WARNINGS RELATING TO THE SAFETY
OF PERSONNEL AND EQUIPMENT. OBSERVE AND
COMPLY WITH ALL GENERAL AND LOCAL HEALTH
AND SAFETY LAWS, CODES, AND PROCEDURES.
NOTE:
The recommendations and information contained
herein are based on experience and judgement, but should
not be considered to be all inclusive or to cover every
application or circumstance which may arise.
NOTE:
If you have any questions or need additional
information or instructions concerning the operation or
installation of this device, please contact your local
representative or the Cutler Hammer Customer Support
Center.
1.0 GENERAL DESCRIPTION OF DIGITRIP TRIP UNITS
The Digitrip Trip Unit is a breaker subsystem that provides
the protective functions for a circuit breaker. The trip units
are in removable housings, installed in the circuit breaker,
and can be replaced or upgraded in the field by the
customer.
This instruction book specifically covers the application of
the Digitrip Trip Units
(See Figure 1.1)
installed in Type
VCP-T, VCP-TR, T-VAC or T-VACR Medium Voltage
Circuit Breakers.
Figure 1.1 Digitrip Trip Unit with Rating Plug
The Digitrip 520V and 520MCV trip units may be applied
on both 50 and 60 Hertz systems. It detects the power and
frequency and adjusts itself automatically.
The Digitrip 520V and 520MCV are self powered and self
protecting trip units designed to function only with the
associated CH Type-V current sensors.