Siemens Q115 15-Amp 1-Pole Circuit Breaker — Type QP, 10 kAIC

The Siemens Q115 15-amp 1-pole circuit breaker is the workhorse of a residential load centre — the breaker that protects standard lighting and receptacle circuits in kitchens, bedrooms, and finished basements. Type QP plug-in construction snaps into Siemens EQ, PL, and ES series panels without bolts, and the Insta-Wire terminal lets an electrician land a #14–#10 conductor in seconds rather than fighting a captive screw. Inside, a calibrated thermal-magnetic mechanism handles the two failure modes that matter: it rides out the slow heat of a sustained overload without nuisance tripping, then opens hard and fast on a dead short, with a 10 kAIC interrupting rating that holds its ground on a 120/240V service. It drops straight in as a replacement for legacy Murray MP115 breakers, so panel upgrades and renovation work don't stall on a discontinued part. CSA-certified and UL-listed, sourced through verified Siemens supply — not the refurbished or counterfeit stock that circulates on open marketplaces — it earns its single slot in the panel and asks nothing further of it.