Siemens Q145 - 45 A, 120 V, 1-Pole Plug-In Circuit Breaker | AmpState

Meet the Siemens Q145 45A, 120V, 1-Pole Plug-In Molded Case Circuit Breaker — a dependable choice from AmpState for fast, reliable branch-circuit protection in panelboards and load centers. Designed to simplify installation while delivering precise protection, this breaker guards your electrical system against overloads and short circuits, keeping residential, commercial, and light industrial applications running smoothly.

• Fast plug-in connection for quick installation and straightforward replacement, reducing downtime when servicing panels.
• Thermal-magnetic trip unit delivers stable, repeatable protection performance across varying loads and temperatures, helping prevent nuisance trips and ensuring consistent breaker behavior.
• 1-pole, 45A at 120V configuration provides targeted protection for individual branch circuits within standard U.S. electrical systems.
• Compatible with matching OEM load centers and panelboards to maintain proper fit, electrical characteristics, and protection coordination.
• Plug-in molded case design combines compact form with rugged reliability for long-term service in demanding panel environments.

This Siemens Q145 is ideal for professionals and informed DIYers who need a trustworthy, source-compatible solution for protecting branch circuits in

• Residential service panels and feeders needing robust 120V protection
• Commercial panels and light industrial applications where quick replacement matters
• Upgrades or replacements in Siemens or OEM panels that accept plug-in molded case breakers

Why this Q145 stands out in its class is the combination of fast installation, predictable thermal-magnetic protection, and panel compatibility that minimizes installation surprises. The breaker's trip characteristics respond quickly to short circuits while avoiding unnecessary interruptions during normal operation, helping maintain steady power delivery and ease of panel maintenance.

Technical specifications at a glance

• Manufacturer: Siemens
• Part Number: Q145
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 45A
• Voltage Rating: 120V
• Number of Poles: 1
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

For best results, pair the Q145 with the appropriate Siemens load centers or panelboards designed to accept plug-in breakers. When performing panel work, ensure the power is de-energized and follow standard safety practices. With its focused amperage, straightforward installation, and reliable protection, the Siemens Q145 is a practical, durable choice for safeguarding critical circuits in a wide range of installations.