PowerPact™ M-, P- and R-Frame, and Compact™ NS630b–NS3200 Circuit Breakers
Section 2—Electronic Trip Systems
exceeded, will trip the circuit breaker with no intentional delay. Instantaneous trip dial settings are
2–16 x In for 600 A circuit breakers and 1.5–12 x In for 800–1200 A circuit breakers.
Micrologic™ Electronic Trip Systems
The P-frame, R-frame and NS630b–NS3200 electronic trip circuit breakers can be equipped with the
optional Micrologic trip systems listed below:
Table 15:
Micrologic Trip Systems
(LSIG)
Long-time + Short-time
+ Instantaneous
Protection + Equipment
Ground-fault Protection
(UL LIsted, IEC Rated)
Model
(LS0)
Long-time +
Short-time +
Zero delay
(IEC Rated Only)
(LI)
Long-time +
Instantaneous
Protection
(UL Listed,
IEC Rated)
(LSI)
Long-time +
Short-time +
Instantaneous
Protection
(UL LIsted, IEC Rated)
Micrologic Basic Trip Unit
2.0
3.0
5.0
—
Micrologic A Trip Unit
2.0A
3.0A
5.0A
6.0A
Micrologic P Trip Unit
—
—
5.0P
6.0P
Micrologic H Trip Unit
—
—
5.0H
6.0H
Trip units are designed to protect power circuits and loads. Micrologic trip systems use a set of current
transformers (called CTs or sensors) to sense current, a trip unit to evaluate the current, and a tripping
solenoid to trip the circuit breaker. Adjustable rotary switches on the trip unit allow the user to set the
proper overcurrent or equipment ground-fault current protection required in the electrical system. If
current exceeds a set value for longer than its set time delay, the trip system opens the circuit breaker.
Alarms may be programmed for remote indications. Measurements of current, voltage, frequency,
power, and power quality optimize continuity of service and energy management.
Integration of protection functions in the Application Specific Integrated Circuit (ASIC) electronic
component used in all Micrologic trip units guarantees a high degree of reliability and immunity to
conducted or radiated disturbances. On Micrologic P and H trip units, advanced functions are
managed by an independent microprocessor.
Circuit breakers are shipped with the trip unit long-time pickup switch set at 1.0 and all other trip unit
adjustments set at their lowest settings. Actual settings required for a specific application must be
determined by a qualified consultant or plant engineer. A coordination study is recommended to
provide coordination between all circuit breakers in the distribution system.
Table 16:
Micrologic™ Trip Unit Features
Micrologic Trip Unit (X = Standard Feature O = Available Option)
Feature
Standard
Field-Installable
Harmonics
3.0
5.0
2.0A
3.0A
5.0A
6.0A
5.0P
6.0P
5.0H
6.0H
X
X
X
X
X
X
X
X
X
X
X
X
LS0
Power
2.0
LI
X
X
X
LSI
LSIG/Ground-Fault
Ammeter
X
X
Trip1
X
X
Ground-Fault Alarm/No Trip1, 2
X
X
X
Ground-Fault Alarm and Trip1, 2
X
X
X
X
Adjustable Rating Plugs
X
X
X
X
X
X
X
X
X
X
X
True RMS Sensing
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
UL Listed
Thermal Imaging
X
Phase-Loading Bar Graph
23
© 2001–2012 Schneider Electric
All Rights Reserved
™
10/2012
PowerPact™ M-, P- and R-Frame, and Compact™ NS630b–NS3200 Circuit Breakers
Section 8—Accessories
Micrologic™ Trip Unit Accessories
Circuit breakers are shipped with trip unit installed, but can have the trip units replaced in the field.
Actual trip units and settings required for specific applications must be determined by a qualified
consultant or plant engineer. A coordination study is recommended to provide coordination between all
circuit breakers in the distribution system.
Table 70:
Field-Installable Micrologic Trip Unit
Model
Protection
Additional Features
Field-Installable Cat. No.1
2.0 (IEC only)
3.0 (UL/ANSI only)
5.0
LSO
LI
LSI
None
S132R
S131A
S133A
2.0A (IEC only)
3.0A (UL/ANSI only)
5.0A
6.0A
LSO
LI
LSI
LSIG
Ammeter
S142R
S141A
S143A
S144A
5.0P
6.0P
LSI
LSIG
Metering, Advanced Protection
S163A 2
S164A 2
5.0H
6.0H
LSI
LSIG
Metering,
Advanced Protection & Harmonic Analysis
S173A 2
S174A 2
1
The standard rating plug supplied with a trip unit is the “A” rating plug. To specify an alternative adjustable rating plug, please
add the letter designation to the end of the catalog number. Please refer to Digest for a complete listing of adjustable settings
available with each plug. (Example: S143B would specify a “B” rating plug instead of the standard "A" plug.) Use suffix “N” if
no rating plug is required.
When replacing a Basic trip unit with Type A (Ammeter), P (Power metering) or H (Harmonic analysis) trip unit, order the 12pin connector kit S33101 for the PowerPact P-frame drawout circuit breakers or kit S33100 for PowerPact P-frame unit-mount
and R-frame circuit breakers.
2
Requires Circuit Breaker Communications Module.
Lead-Free Trip Unit Sealing Kit
The MICROTUSEAL lead-free trip unit seal was designed as a RoHS-compliant replacement for lead
seals. It may be used to seal Micrologic trip units and other devices. It is manufactured as a stainless
steel cable and polycarbonate locking mechanism which shows evidence of tampering. The seal is
individually numbered for control purposes.
Order kit number
MICROTUSEAL .
Replacement Covers
Table 71:
Replacement Covers
Device
Cat. No.
Micrologic A Trip Unit Cover, clear
S33592
Micrologic P/H Trip Unit Cover, opaque gray
S47067
74
10/2012
™
© 2001–2012 Schneider Electric
All Rights Reserved