Selective Coordination

Mission Critical Circuit Breakers

Plug-in

Drawout

Rear Connected

PowerPact J- and L-Frame Mission Critical Circuit Breakers

Ratings

Available Configurations

UL 489 Listed
CSA Certified
Voltage: 480 V

I-Line mounting

Main circuit breaker in NQ and NF panelboards

Unit mount for OEM users

Plug-in base for OEM users

Drawout base ofr OEM users

Designed for selectively coordinated systems, mission critical circuit breakers maximize continuity of the electrical service by allowing the branch circuit breaker to clear the fault.

Mission critical circuit breakers are engineered with technology that optimizes current, time and energy selectivity so the fault is cleared by the circuit breaker immediately upstream of the occurrence. This technology (see figure below) allows the remaining areas of the electrical system to continue operation without disruption. In addition to unique design attributes, Square D mission critical circuit breakers have also undergone rigorous testing procedures to certify the coordination with downstream circuit breakers—combining innovative engineering with validated test results.

Apply Square D mission critical circuit breakers in emergency power distribution systems, data centers, hospitals or anywhere continuity of service is desired.

The PowerPact™ J- and L-Frame Mission Critical circuit breakers deliver high levels of selective coordination in a flexible design that can be easily configured for a variety of applications. Tested to be selectively coordinated with the QO™ family of miniature circuit breakers and the ED, EG, and EJ circuit breakers, this solution provides peace of mind when power availability is critical.

An electronic trip unit provides adjustable long-time settings in four sensor sizes, allowing coverage from 70 A through 600 A on a 120–240, 208Y/120, 240, 480Y/277, and 480 V systems.

PowerPact Circuit Breakers with Micrologic Electronic Trip Units

The advantages of being able to adjust the trip curve of a circuit breaker equipped with an electronic trip system are obvious. There are other advantages, such as being able to adjust or turn off the instantaneous trip function on some circuit beakers and models of trip units.

J-Frame 250 A Electronic Trip Mission Critical 100% Rated Circuit Breakers (480/277 Vac) with Factory Sealed Trip Units Suitable for Reverse Connection

Electronic Trip
Unit Type

Trip Function

Trip Unit

Continuous Current

Cat. No.

Terminal

D Interrupting

G Interrupting

J Interrupting

L Interrupting

Standard

LI

3.2 W

250 A

JDL34250WU31X

JGL34250WU31X

JJL34250WU31X

JLL34250WU31X

AL250JD [1]

Standard

LSI

3.2S-W

250 A

JDL34250WU33X

JGL34250WU33X

JJL34250WU33X

JLL34250WU33X

AL250JD [1]

High Perf. Ammeter

LSI

5.2A-W

250 A

JDL34250WU43X

JGL34250WU43X

JJL34250WU43X

JLL34250WU43X

AL250JD [1]

High Perf. Energy

LSI

5.2E-W

250 A

JDL34250WU53X

JGL34250WU53X

JJL34250WU53X

JLL34250WU53X

AL250JD [1]

High Perf. Ammeter

LSIG

6.2A-W

250 A

JDL34250WU44X

JGL34250WU44X

JJL34250WU44X

JLL34250WU44X

AL250JD [1]

High Perf. Energy

LSIG

6.2E-W

250 A

JDL34250WU54X

JGL34250WU54X

JJL34250WU54X

JLL34250WU54X

AL250JD [1]

J-Frame Termination Options

Termination Letter

A = I-Line (See Section 9)

J G L 3 6 1 0 0

For factory-installed termination, place termination letter in the third block of the circuit breaker catalog number.

Termination Letter

F = No Lugs (includes terminal nut kit on both ends) [2]

L = Lugs both ends

M = Lugs ON end Terminal Nut Kit OFF end

P = Lugs OFF end Terminal Nut Kit ON end

N = Plug-in

D = Drawout

S = Rear Connected

J-Frame Interrupting Ratings

Voltage

Interrupting Rating

D

G

J

L

240 Vac

25 kA

65 kA

100 kA

125 kA

480 Vac

18 kA

35 kA

65 kA

100 kA

L-Frame 600 A Electronic Trip Mission Critical Circuit Breakers (480/277 Vac) with Factory Sealed Trip Units Suitable for Reverse Connection [3]

Electronic Trip
Unit Type

Trip Function

Trip Unit

Continuous Current

Cat. No.

Terminal

D Interrupting

G Interrupting

J Interrupting

L Interrupting.

480/277 Vac, 50/60 Hz, 3P

Standard

LI

3.3 W

250 A

LDL34250WU31X

LGL34250WU31X

LJL34250WU31X

LLL34250WU31X

AL400L61K3 [4]

400 A

LDL34400WU31X

LGL34400WU31X

LJL34400WU31X

LLL34400WU31X

AL600LS52K3 [5]

600 A

LDL34600WU31X

LGL34600WU31X

LJL34600WU31X

LLL34300WU31X

Standard

LSI

3.3S-W

250 A

LDL34250WU33X

LGL34250WU33X

LJL34250WU33X

LLL34250WU33X

AL400L61K3 [4]

400 A

LDL34400WU33X

LGL34400WU33X

LJL34400WU33X

LLL34400WU33X

AL600LS52K3 [5]

600 A

LDL34600WU33X

LGL34600WU33X

LJL34600WU33X

LLL34300WU33X

High Perf. Ammeter

LSI

5.3A-W

400 A

LDL34400WU43X

LGL34400WU43X

LJL34400WU43X

LLL34400WU43X

AL600LS52K3 [5]

600 A

LDL34600WU43X

LGL34600WU43X

LJL34600WU43X

LLL34300WU43X

High Perf. Energy

LSI

5.3E-W

400 A

LDL34400WU53X

LGL34400WU53X

LJL34400WU53X

LLL34400WU53X

AL600LS52K3 [5]

600 A

LDL34600WU53X

LGL34600WU53X

LJL34600WU53X

LLL34300WU53X

High Perf. Ammeter

LSIG

6.3A-W

400 A

LDL34400WU44X

LGL34400WU44X

LJL34400WU44X

LLL34400WU44X

AL600LS52K3 [5]

600 A

LDL34600WU44X

LGL34600WU44X

LJL34600WU44X

LLL34300WU44X

High Perf. Energy

LSIG

6.3E-W

400 A

LDL34400WU54X

LGL34400WU54X

LJL34400WU54X

LLL34400WU54X

AL600LS52K3 [5]

600 A

LDL34600WU54X

LGL34600WU54X

LJL34600WU54X

LLL34300WU54X

480/277 Vac, 50/60 Hz, 4P

Standard

LI

3.3 W

250 A

LDL44250WU31X

LGL44250WU31X

LJL44250WU31X

LLL44250WU31X

AL400L61K4 [4]

400 A

LDL44400WU31X

LGL44400WU31X

LJL44400WU31X

LLL44400WU31X

AL600LS52K4 [5]

600 A

LDL44600WU31X

LGL44600WU31X

LJL44600WU31X

LLL44300WU31X

Standard

LSI

3.3S-W

250 A

LDL44250WU33X

LGL44250WU33X

LJL44250WU33X

LLL44250WU33X

AL400L61K4 [4]

400 A

LDL44400WU33X

LGL44400WU33X

LJL44400WU33X

LLL44400WU33X

AL600LS52K4 [5]

600 A

LDL44600WU33X

LGL44600WU33X

LJL44600WU33X

LLL44300WU33X

High Perf. Ammeter

LSI

5.3A-W

400 A

LDL44400WU43X

LGL44400WU43X

LJL44400WU43X

LLL44400WU43X

AL600LS52K4 [5]

600 A

LDL44600WU43X

LGL44600WU43X

LJL44600WU43X

LLL44300WU43X

High Perf. Energy

LSI

5.3E-W

400 A

LDL44400WU53X

LGL44400WU53X

LJL44400WU53X

LLL44400WU53X

AL600LS52K3 [5]

600 A

LDL44600WU53X

LGL44600WU53X

LJL44600WU53X

LLL44300WU53X

High Perf. Ammeter

LSIG

6.3A-W

400 A

LDL44400WU44X

LGL44400WU44X

LJL44400WU44X

LLL44400WU44X

AL600LS52K4 [5]

600 A

LDL44600WU44X

LGL44600WU44X

LJL44600WU44X

LLL44300WU44X

High Perf. Energy

LSIG

6.3E-W

400 A

LDL44400WU54X

LGL44400WU54X

LJL44400WU54X

LLL44400WU54X

AL600LS52K4 [5]

600 A

LDL44600WU54X

LGL44600WU54X

LJL44600WU54X

LLL44300WU54X

Accessories see PowerPact™ Circuit Breaker Accessories

Optional Lugs see Mechanical Lugs

Compression and PDC Lugs see Supplemental Digest, Section 3

Dimensions see Molded Case Circuit Breaker Dimensions

Enclosures see Enclosures

Footnotes

  1. AL250JD terminal wire range is (1) 3/0 AWG–350 kcmil Al or Cu.
  2. Add TS suffix for circuit breaker without terminal nut kit.
  3. Standard rating (100%) for 250 A and 400 A only. Standard rating 80% for 600 A.
  4. AL400L61K3 terminal wire ranges are (1) #2 AWG–500 kcmil Al or (1) #2 AWG–600 kcmil Cu.
  5. AL600LS52K3 terminal wire ranges are (2) 2/0 AWG–500 kcmil Al or Cu.

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