Siemens BQ3B020H - 20 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Siemens BQ3B020H delivers reliable overcurrent and short-circuit protection for power distribution in panelboards and load centers. This 20A, 240V, 3-pole bolt-on molded case circuit breaker is engineered for durability and precision, pairing a secure mounting scheme with a thermal-magnetic trip unit to provide stable, repeatable protection where it matters most.

• Secure bolt-on mounting: A rigid, vibration-resistant bus connection that stays solid through equipment movement and routine maintenance.
• Thermal-magnetic trip unit: Combines heat-based overload protection with magnetic short-circuit response for dependable, predictable tripping behavior.
• 3-pole, 240V, 20A configuration: Ideal for 3-phase feeders and branch circuits in commercial, residential, and light industrial applications.
• Molded-case durability: Built to withstand the demands of electrical panels, delivering long-term performance in busy panels and enclosures.
• OEM compatibility: Designed to work with matching OEM load centers and panelboards, simplifying retrofits and installs.
• Targeted protection: Specifically engineered for branch circuit overcurrent and short-circuit protection, helping to prevent damage and downtime.

This breaker is purpose-built for professionals who need a dependable, plug-and-play solution that integrates smoothly with existing panel infrastructure. The 3-pole design supports 3-phase systems and larger distribution schemes, while the 20A rating covers a broad range of typical branch circuits found in homes, offices, retail spaces, and light industrial equipment bays.

Ideal use cases

• Residential service panels requiring robust protection for multi-wire branch circuits and shared loads.
• Commercial panelboards powering lighting, HVAC controls, outlets, and small equipment feeders.
• Light industrial panels where reliable, vibration-tolerant protection is needed for 3-phase feeders.

Key benefits in practice

• Reduced nuisance trips due to a stable thermal-magnetic trip mechanism that responds quickly to short circuits while accommodating normal load variations.
• Peace of mind from a unit designed to mount securely in OEM-compatible panel systems, ensuring consistent electrical performance over time.
• Streamlined installation and maintenance with a bolt-on interface that simplifies service upgrades and panel replacements.

Technical snapshot

• Manufacturer: Siemens
• Part Number: BQ3B020H
• Type: Thermal-magnetic molded case circuit breaker
• Amperage: 20A
• Voltage: 240V
• Poles: 3
• Mounting Style: Bolt-on
• Applications: Branch circuit overcurrent and short-circuit protection

Whether you’re upgrading an aging panel, stocking parts for ongoing service work, or installing new equipment in a light industrial setting, the Siemens BQ3B020H offers a precise, durable solution designed to fit seamlessly with compatible OEM load centers and panelboards. With its combination of secure mounting, dependable trip technology, and industry-standard ratings, it helps you keep circuits protected, downtime to a minimum, and panels running smoothly.