QO Plug on and QOB (bolt-on) one, two and three pole thermal-magnetic circuit breakers provide overcurrent protection and switching on anc and dc systems. Plug-on QO circuit breakers are for use in QO load centers , NQ and NQOD panelboards, OEM mounting bases and Speed-D switchboard distribution panels.Bolt-on QOB circuit breakers are for use in NQO and NQOD panelboards.AWG 14...AWG 8 for 1 cable(s) (aluminium/copper).HACR rated.