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48049-136-05 Micrologic™ 2.0A, 3.0A, 5.0A, and 6.0A Electronic Trip Units
Rev. 01, 07/2012 Section 1—General Information
© 1999–2012 Schneider Electric All Rights Reserved
15-EN
ENGLISH
The following will be powered and functional with external power:
• All of the above functions which are functional without external power.
• Ammeter and bar graph displays are functional with or without current
flowing through the circuit breaker. With current flow between 0 and 20%
of sensor value, the ammeter may not be accurate.
• Trip settings and max. current readings can be accessed on the display
be pressing the navigation buttons with or without current flowing
through the circuit breaker.
• Ground-fault push-to-trip button works for testing ground fault with or
without current flowing through the circuit breaker.
• Optional Modbus communications are functional, using a separate 24
Vdc power supply for the circuit breaker communications module. This
separate 24 Vdc power supply is required to maintain the isolation
between the trip unit and communications.
The ground-fault push-to-trip is also functional if a Hand-Held Test Kit or
Full-Function Test Kit is powering the trip unit.
External Power Supply
The trip unit display can be powered by a 24 Vdc external power supply.
Power supply is used for graphic scree display when the circuit breaker is
open or not carrying current.
CAUTION
HAZARD OF SHOCK, ARC FLASH OR
EQUIPMENT DAMAGE
Trip unit and communication module must use
separate power supplies.
Failure to follow this instruction can result
in personal injury or equipment damage.
Table 7: Power Supply Specifications
Function Specification
Power for Trip Unit Alone 24 Vdc, 50 mA
Minimum Input-to-Output Isolation 2400 V
Output (Including Max. 1% Ripple) ±5%
Dielectric Withstand (Input/Output) 3 kV rms
Connections
Connections UC3
F1 (-)
F2 (+)
24 Vdc