Siemens BQ1B03000S01 30 Amp 120 Volt 1-Pole Bolt-On Circuit Breaker

Siemens BQ1B03000S01 is a 30A, 120V, 1-pole bolt-on molded case circuit breaker designed to shield your panelboards and load centers from branch circuit overcurrent and short circuits. Built for dependable, repeatable protection, this breaker delivers a secure, vibration-resistant connection and reliable performance in a range of environments—from home electrical closets to light commercial panels.

• Secure bolt-on mounting provides a rigid bus connection, reducing movement and ensuring consistent protection even in vibration-prone installations.
• Thermal-magnetic trip unit combines thermal overload sensing with magnetic short-circuit protection for stable, predictable trip behavior and fast response when an electrical fault occurs.
• 1-pole, 30A, 120V configuration for efficient protection of individual branch circuits in residential, commercial, and light industrial settings.
• Molded case construction offers rugged reliability with a compact footprint designed to fit standard panelboards and load centers.
• OEM-compatible design ensures seamless integration with matching Siemens units and other compatible load centers, simplifying upgrades and replacements.
• Versatile applications suited for protecting lighting circuits, receptacle circuits, small appliance circuits, and other branch circuits in a variety of environments.

Technical snapshot

• Manufacturer: Siemens
• Part Number: BQ1B03000S01
• Type: Thermal-magnetic molded case circuit breaker
• Amperage: 30A
• Voltage: 120V
• Poles: 1
• Mounting Style: Bolt-on
• Applications: Branch circuit overcurrent and short-circuit protection

Why this breaker stands out

What sets the BQ1B03000S01 apart is its thoughtful combination of secure mounting, precise protection, and broad compatibility. The bolt-on design minimizes connection looseness that can lead to unreliable trips, making it a dependable choice in spaces where equipment experiences vibration or movement. The thermal-magnetic protection delivers repeatable performance across varying temperatures and load conditions, helping prevent nuisance trips while still delivering fast response to genuine faults.

Ideal for installers and building owners who demand a straightforward, reliable replacement in Siemens-compatible panels, this 30A, 120V, 1-pole breaker is a practical choice for upgrading older panels, expanding capacity in shared spaces, or replacing a failed unit without sacrificing panel compatibility.

Practical use cases

• Protect a dedicated lighting or receptacle circuit in a residential panel, ensuring quick shutdown during overloads or shorts.
• Upgrade or replace a faulty breaker in small commercial panels where reliability and ease of maintenance matter.
• Use in light industrial applications where a robust, bolt-on connection helps maintain steady protection in environments with mild vibration or movement.

With the Siemens BQ1B03000S01, you gain a trusted, purpose-built solution for protecting critical electrical circuits in panelboards and load centers. Its precise, dependable performance—coupled with OEM compatibility and a secure bolt-on mount—helps you maintain safe, compliant electrical systems with confidence.