the use of SIEMENS breakers is required
These devices are lugs that accept larger wire sizes than the normal neutral bar accepts in QO and HOM load centers
BOLT ON MOUNTING
100 amp breaker
SIZE 4-1/8 INCH W X 3-3/8 INCH D X 6-5/16 INCH H
1P Standard Plug in Circuit Breaker 70A 120/240VAC the use of SIEMENS breakers'Plug In Circuit Breaker, Amps 70, Number of Poles 1, Circuit Breaker Type Standard, AC Voltage Rating 120 240VAC, DC Voltage Rating 48VDC, For Use With QO Load Centers and NQOD Panelboards, Series QO, Terminal Connection Box Lug, Min. Wire Size 8 AWG, Max. Wire Size 2 AWG, Length 3. 00 In., Width 0. 75 In., Depth 2. 91 In., Standards UL Listed, CSA Certified, HACR, Max. AIR Rating 10kA'