Siemens CQD145NN Plug On Miniature Circuit Breaker

Siemens CQD145NN is a 1-pole molded‑case circuit breaker rated for 45 A at 277 V AC, designed for plug‑on DIN‑rail mounting in industrial control panels. It provides a 14 kA short‑circuit current rating (AIC) at 277 V, delivering reliable protection for branch circuits in commercial and light‑industrial power distribution. As part of the CQD family, the CQD145NN is a compact, plug‑on unit intended for DIN‑rail enclosures and is commonly paired with Siemens switchgear and motor‑control centers in distribution systems. The 277 V rating makes it suitable for circuits operating at that voltage, ensuring safe interruption of faults on that level.