SE Digest 178

QOB Circuit Breakers for NQ Panelboards

NQ Panelboards—240 Vac, 48 Vdc

Online Refer to NQ Panelboards

www.se.com/us

Table 9.13: QO/QOB Circuit Breaker Wire Sizes Breaker Type Ampere Rating

Wire Size (AWG or kcmil)

Al

Cu

10–30A 10–30A 35–70A 10–30A 10–30A 35–70A 80–125A 150–200A 10–30A 35–70A 80–125A 110–150A

#14–8

#14–8

QOB 1-pole

—

two#14–10

#8–2 #14–8

#8–2 #14–8

—

two#14–10

QOB 2-pole

#8–2

#8–2

#4–2/0 #4–300 #14–8 #4–2/0 #4–300 #12–8 #12–4 #8–2

#4–2/0 #4–300 #14–8 #4–2/0 #4–300 #14–8 #14–6 #8–2

QOB 3-pole

QOB-VH

15–30A

QOB-GFI and QOB-EPD

40, 50, or 60 A

Table 9.14: QO ™ Arc-Fault and Dual Function Circuit Breakers [69][70][71]

1P120Vac 10kAIR 1Space Required

1P120Vac 22kAIR 1Space Required

2P240Vac 10kAIR 2Space Required

2P240Vac 22kAIR 2Space Required

Circuit Breaker Type Ampere Rating [71]

Catalog Number QOB115CAFI QOB120CAFI

Catalog Number Catalog Number Catalog Number

9 PANELBOARDS

Combination Arc-Fault Interupter Dual Function: Arc-Fault and Ground Fault

QOB115VHCAFI QOB120VHCAFI

QOB215CAFI QOB220CAFI

QOB215VHCAFI QOB220VHCAFI

15A 20A 15A 20A

QOB115DF QOB115VHDF Use plug-on QO 2–pole dual function MCBs QOB120DF QOB120VHDF NOTE: For accessories, see Accessories for QO/QOB Circuit Breakers, in Section7. Single Phase 400 or 600 A NQ Panelboards now accept 175 and 200 A Two Pole QO Branch Circuit Breakers. Each breaker takes four pole spaces. Installation into three phase interiors is not allowed as it may create a phase to phase short circuit. One NQ200AN neutral lug kit should be installed for each pair of 175 or 200 A QO breakers if a neutral termination is required. Table 9.15: High Ampacity Plug-on Two Pole QO Branch Circuit Breakers Catalog Number Ampere Rating AICRating QO2175 175 10kA QO2200 200 QO2175VH 175 22kA QO2200VH 200 NOTE: May only be installed on Single Phase 400 A or 600 A NQ Panelboards with three point latch trim fronts. A maximum of four 175 or 200 A QO (VH) branch circuit breakers may be installed in NEMA 1 enclosures. These enclosures require NCxxV( )3P three point latch trim fronts, as listed in Table 9.5 Main Lug Interiors, page 9-11 or Table 9.6 Main Circuit Breaker Interiors, page 9-12. One 175 A or 200 A QO (VH) branch circuit breaker may be installed in 8.75" deep MHxxD9VWP NEMA 3R enclosures, as listed in Table 9.5 Main Lug Interiors, page 9-11 or Table 9.6 Main Circuit Breaker Interiors, page 9-12.

[69] UL Listed as HACR type for use with air conditioning, heating, and refrigeration equipment having motor group combinations and marked for use with HACR type circuit breakers. [70] QO arc-fault circuit breakers provide branch feeder protection (for example, QO115AFI) or combination protection (for example, QO115CAFI) as required by the NEC and local code adoption, and comply with UL 1699. [71] 10–30 A circuit breakers are suitable for use with 60°C or 75°C conductors. 35–60 A circuit breakers are suitable for use with 75°C conductors.

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