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Micrologic™ 2.0A, 3.0A, 5.0A, and 6.0A Electronic Trip Units 48049-136-05
Section 4—Trip Unit Replacement Rev. 01, 07/2012
© 1999–2012 Schneider Electric All Rights Reserved28-EN
ENGLISH
Section 4—Trip Unit Replacement
Required Tools • Torque-controlled screwdriver, set at 7 in-lbs (0.8 N•m) ± 10%
(Lindstrom torque driver MAL500-2 or equivalent)
• Micrologic Full-Function Test Kit (part number S33595)
Preparation
Record Switch Settings Record all trip unit switch settings for later use.
Circuit Breaker Disconnection Disconnect circuit breaker as directed in the circuit breaker instruction
bulletin shipped with the circuit breaker. The circuit breaker must be
completely isolated. (For a drawout circuit breaker, place circuit breaker in
the disconnected position. For a fixed-mounted circuit breaker, all voltage
sources, including auxiliary power, must be disconnected.)
Circuit Breaker Accessory Cover
Removal
Remove circuit breaker accessory cover as directed in the Install
Accessories section of the circuit breaker instruction bulletin shipped with
the circuit breaker.
Trip unit replacement must be done by qualified
persons, as defined by the National Electric
Code, who are familiar with the installation and
maintenance of power circuit breakers.
Before replacing trip unit, confirm that the circuit
breaker is in good working condition. If the
condition of the circuit breaker is unknown, do
not proceed. For assistance in evaluating the
condition of the circuit breaker, call Technical
Support.
Read this entire section before starting the
replacement procedure.
NOTE: If trip unit being replaced is a Micrologic
2.0, 3.0 or 5.0 trip unit, order connector block
S33101 and circuit breaker or cradle wiring
harness if necessary.
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Failure to follow these instructions for installation, trip test and primary
injection testing may result in the failure of some or all protective function.
• Apply appropriate personal protective equipment (PPE) and follow safe
electrical work practices. See NFPA 70E or CSA Z462.
• Replacement/upgrading of a trip unit in the field must be done by
qualified persons, as defined by the National Electric Code, who are
familiar with the installation and maintenance of power circuit breakers.
• Before replacing/upgrading trip unit, confirm that the circuit breaker is in
good working condition. If the condition of the circuit breaker is unknown,
do not proceed. For assistance in evaluating the condition of the circuit
breaker, call Technical Support.
• If the circuit breaker fails to function properly in any manner upon
completion of the trip unit installation, immediately remove the circuit
breaker from service and call Field Services.
• Turn off all power supplying this equipment before working on or inside
equipment. Follow instructions shipped with circuit breaker to disconnect
and reconnect circuit breaker.
• Replace all devices, doors and covers before returning equipment to
service.
Failure to follow this instruction will result in death or serious injury.