NF Factory Assembled Main Circuit Breakers

Refer to NF Panelboards

Factory Assembled Main Circuit Breakers
(600Y/347 Vac maximum)

NF Panelboard Factory Assembled Interiors—600Y/347 Vac Max

Single Phase 3-Wire (1P/3W), or Three Phase 4-Wire (3P/4W)[1]

Mains Rating (Amps)

Max. Number of One-Pole Circuit Breakers

Bus Material

Min. Box Depth (inches) 

Main Lugs Only

Circuit Breaker Frame

Main Breaker[2]

Main Switch[2]

Main Lugs Only

Main Breaker / Switch

125 Max

ED, EG, EJ[3]

15–125

18, 30

Al, Cu

5.75 in.

5.75 in.

125 Max

HD/HG/HJ/HL/HR

15–125

110–125

18, 30, 42[4], 54[4]

Al, Cu

5.75 in.

5.75 in.

250 Max

JD/JG/JJ/JL/JR

150–250

150–250

30, 42, 54, 66[5]

Al, Cu

5.75 in.

5.75 in.

400 Max

LG/LJ/LL/LR & LA/LH

125–400

300–400

30, 42, 54, 66[5], 84

Al, Cu

5.75 in.

8.75 in. or 5.75 in.[6]

600 Max

LG/LJ/LL/LR

400–600

450–600

30, 42, 54, 66, 84

Cu

5.75 in.

8.75 in.[6]

800 Max

MG 600–800

30, 42, 54

Cu

8.75 in.[7]

8.75 in.[8]
PG, PJ, PL 600–800 600–800

note

Factory Assembled Main Circuit Breakers (600Y/347 Vac maximum). 600Y/347 Vac applications require use of ExBx6xxx branch circuit breakers, i.e. EDB16015 for a 1P, 15A circuit.[9]

400 A and 600 A panelboards, 1Ø or 3Ø

PowerPacT L-frame - see Tables in Section 7.

Main Circuit Breaker

No. of Poles Trip Unit Options Frame Sizes Ampacity

3

LI, LSI, Switch

LG, LJ, LL, LR

125–600 A

LA/LH, PowerPacT H and J-frame circuit breakers are also available—see Tables in Section 7 and Supplemental Digest Section 3.

PowerPacT L Main Circuit Breaker Cabinet Height (inches)

Max. No. of Branch Spaces
(Does not include sub-feed circuit breaker spaces)
NEMA 1 Enclosure
(20 in. W x 8.75 in. D)[10]
Vented NEMA 3R Enclosure
(26 in. W x 8.75 in. D)[11]
400 / 600 A Interior 400 A 600 A
30 68 68 74
42 74 74 80
54 80 80 86
66 92

NF Sub-Feed Circuit Breakers (available on 1Ø or 3Ø, 250 A–800 A main lugs or 250 A–600 A main circuit breaker interiors)

Interior Mains Rating Mains Type Space Factor[12] (in.) Sub Feed Breaker
No. of Poles Ampacity Sub-Feed Circuit Breaker Frame No. Of Sub Feed Breakers Available to Install
250 A Main Lugs or Main Breaker 18 2 or 3 110 - 150 HD, HG, HJ, HL, HR 1
 
150 - 250 JD, JG, JJ, JL, JR
 
400 A /
600 A /
800 A
Main Lugs or LA / LH
Main Breaker
18 110 - 150 HD, HG, HJ, HL, HR 1 or 2
PowerPacT L
Main Breaker
12
Main Lugs or LA / LH
Main Breaker
18 150 - 250 JD, JG, JJ, JL, JR
PowerPacT L
Main Breaker
12
Main Lugs or LA / LH
Main Breaker
18 300 - 400 LA, LH 1
PowerPacT L
Main Breaker
12
Main Breaker or Main Lugs 36   LA or LH with PowerPacT H or J 1 LA or LH and 1 H or J
 
Main Lugs or Main Breaker 18 3 125 - 600 LG, LJ, LL, LR[13] 1

Footnotes

  1. NF panelboards without neutral connections may be applied in 3-phase, 4-wire grounded Wye systems, except at the Service Entrance.
  2. Factory Assembled Interiors are rated for trip current of Main Breaker / Switch.
  3. Back-Fed Main Breaker applications only.
  4. Three Phase Copper only.
  5. Three Phase only.
  6. 8.75" Deep Box required for PowerPacT L Main Breaker or Switch.
  7. Enclosures limited to NEMA Type 1 only.
  8. 8.75" Enclosures limited to 26" Wide NEMA Type 1.
  9. Requires use of ExBx6xxx branch circuit breakers, i.e. EDB16015 for a 1P, 15A circuit.
  10. D9 8.75" deep enclosure and three point latch door is required for PowerPacT L Main Circuit Breaker, Switch, or Sub-Feed Circuit Breaker. See NF Main Circuit Breaker Interiors - Use I-Line Panelboard for 3Ø3W Delta applications above 240 Vac.
  11. PowerPacT L not available in non-vented (NEMA Type 3R/5/12, or 4/4X) enclosures.
  12. Space Factor is added to Space Factors for Interior and Main Breaker (if present).
  13. D9 8.75" deep enclosure and three point latch door is required for PowerPacT L Main Circuit Breaker, Switch, or Sub-Feed Circuit Breaker. PowerPacT L Sub-Feed Circuit Breakers cannot be installed on 400A NF Panelboard interiors. Use NF interiors with a mains ratings of at least 600A for all NF Panelboards applications requiring a PowerPacT L circuit breaker. See Table 9.47

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