Siemens QP Q320 NTO Circuit Breaker

Siemens QP Q320 is a 3-pole, 20 A, 240 V plug-in circuit breaker from the QP family, designed to protect 120/240 V circuits in Siemens panelboards. It features thermal/magnetic trip protection and up to 10 kA interrupting capacity (AIC) at 240 V, making it suitable for safeguarding three-phase feeders and associated loads in commercial or light industrial applications. The unit is intended for plug-in mounting in compatible Siemens QP (and QPH/HQP) panels, delivering reliable overcurrent protection with a three-pole configuration that supports 3‑phase circuits or 3‑wire distribution. The Q320 designation communicates a 20 A per pole, three-pole lineup, aligning with standard Siemens equipment in many residential and small-business installations. Widely cataloged by retailers and distributors under Siemens QP Q320, this breaker integrates with standard Siemens panel products and replacement-part ecosystems, including legacy ITE installations where applicable.