Schneider Electric and 6.0A, 3.0A, 2.0A, 5.0A Trip Unit Replacement, Required Tools, Preparation

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

Section 4—Trip Unit Replacement

ENGLISH

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.

Required Tools

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.

•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	Remove circuit breaker accessory cover as directed in the Install
Removal	Accessories section of the circuit breaker instruction bulletin shipped with
	the circuit breaker.

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