Specifications

Power-Zone
®
4
General and Application Information
29
11/2005
© 2005 Schneider Electric All Rights Reserved
Micrologic
®
Trip Units
A new family of field-installable trip units is available with Masterpact
®
NW and NT circuit breakers.
The circuit breaker overcurrent protection consists of a solid-state, microprocessor-based tripping
device that requires no external power source. The complete tripping system has three main
components: the molded sensors, the trip device (with rating plug), and the trip actuator. The
microprocessor-based trip unit uses true RMS current level sensing. For additional information, refer to
the trip unit functionality matrix on page 41.
When a Masterpact NW or NT circuit breaker is closed, no external power is required for the protection
system. The trip unit is powered by current signal levels and current sensors integrally mounted in the
Masterpact NW or NT circuit breaker. All trip units are UL Listed for use in Masterpact NW or NT circuit
breakers.
Basic Trip Unit
S
tan
d
ar
d
T
r
i
p
F
eatures:
• True RMS sensing
• LI trip configuration
• Field interchangeable long-time rating
plugs
• LED long-time pickup indication
• Thermal imaging
A
va
il
a
bl
e
O
p
ti
ons:
• LSI trip configuration
• Test kits
Standard Trip Features:
• True RMS sensing
• LI trip configuration
• Field interchangeable long-time
rating plugs
• LED long-time pickup indication
LSIG trip configurations
• Digital ammeter–phase and
neutral
• Phase loading bar graph
• LED trip indication
• Zone selective interlocking (ZSI)
with short-time and ground fault
• Thermal imaging
Available Options:
• LSI trip configuration
• LSIG (ground fault trip)
• Test kits
Available Powerlogic
®
Features:
• Amps metering
• Circuit breaker open/close trip
status
• Tripping curves
Type A (Ammeter) Trip Unit
Micrologic Basic Trip
Unit
Micrologic Type A Trip
Unit