Brochure

PowerPact H-, J-, and L-Frame Circuit Breakers
Motor Circuit Protection
56
02/2016 © 2011–2016 Schneider Electric
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Micrologic 2.2 M and 2.3 M Electronic Trip Units
Micrologic 2.2 M and 2.3 M trip units provide built-in thermal and instantaneous protection. They are
used in 2-device motor-feeder solutions on PowerPact H-, J-, and L-frame circuit breakers with
performance levels J/L. They provide protection for motors up to 315 kW at 400 V against:
• short-circuits
• overloads with selection of a trip class (5, 10 or 20)
• phase unbalance.
Circuit breakers with a Micrologic 2.2 M/ 2.3 M trip unit include protection similar to an inverse-time
overload relay. They are combined with a contactor.
Protection settings are made using a rotary switch.
Overloads (or Thermal Protection)
Long-time protection and trip class (FLA)
• Inverse-time thermal protection against overloads with adjustable pick-up FLA.
• Settings are made in amperes. The tripping curve for the long-time protection, which indicates the
time delay tr before tripping, is defined by the selected trip class.
Table 53: Micrologic 1.3 M Electronic Trip Unit
Rating: I
n
at 104°F (40°C)
1
1
Motor standards require operation at 104°F (40°C). Circuit-breaker ratings are derated to take this requirement into account.
400 A 600 A
Circuit Breaker PowerPact L-frame X X
Short-time protection
Pick-up (A)
accuracy ±15%
I
sd
There is a very short delay to let
through motor starting currents
Adjustable directly in amps
9 settings: 2000-2400-2800-
3200-3600-4000-4800 A
9 settings: 3000-3600-4200-
4800-5400-6000-6600-7200 A
Time delay (ms)
t
sd
Non-adjustable
Non-tripping time
Maximum break time
20
60
Instantaneous protection
Pick-up (A)
accuracy ±15%
I
i
non-adjustable 4800 7200
Non-tripping time
Maximum break time
0
30 ms
Isd (x FLA)
190
310
290
270
250
230
210
50
FLA (A)
Class.
348
330