Siemens QR23B100 - 100 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet Siemens QR23B100, a rugged 3-pole bolt-on molded case circuit breaker engineered for dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. With a solid 100 A rating at 240 V, it’s built to hold up in residential, commercial, and light industrial environments where reliability matters most.

Why this QR23B100 stands out

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection, reducing looseness and electrical impedance in demanding installations.
• Thermal-magnetic trip unit delivers stable, repeatable protection performance by combining fast short-circuit interruption with reliable overload sensing.
• Molded case design enables solid insulation, compact footprint, and safe operation at the standard 240 V of most commercial and residential panels.
• OEM-compatible designed to pair with matching Siemens loadcenters and panelboards for a seamless fit and straightforward replacement or upgrades.
• Versatile application suitable for a wide range of settings—from service panels and electrical rooms to light commercial equipment rooms—where dependable protection is essential.

What problems does it solve?

In environments where panel vibrations, wiring flex, or dense electrical loads are common, this QR23B100 prevents nuisance trips and protects wiring and devices from damage. The bolt-on design minimizes connection delays and loosening over time, while the thermal-magnetic trip unit ensures accurate response to overloads and short circuits, helping you avoid costly downtime and equipment failures.

Ideal use cases

• Upgrading or replacing aging or incompatible circuit breakers in Siemens panelboards and loadcenters.
• Protection for multi-wire branch circuits in residential basements, home offices, or small workshop spaces.
• Commercial electrical rooms and light industrial panels where a reliable 3-pole, 100 A protection device is required.
• Installations where vibration resistance and a secure bus connection are critical to long-term performance.

Technical overview

• Manufacturer: Siemens
• Part number: QR23B100
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 100 A
• Voltage rating: 240 V
• Number of poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Installation and compatibility tips

Choose this QR23B100 when you need a durable, OEM-compatible protection device that aligns with Siemens panelboards and loadcenters. The bolt-on mounting helps ensure a solid, low-impedance connection, which is especially beneficial in installations subject to vibration or movement. For best results, pair with the corresponding Siemens components designed for your panel family to maintain coordinated protection characteristics and trip performance.

What you gain

• Reassuring reliability from a long-standing brand trusted in electrical distribution.
• Clear, predictable protection curves that simplify fault analysis and maintenance planning.
• Ease of integration into existing Siemens mid- to large-size panel installations, with a straightforward replacement path when upgrading to a higher-current or multi-pole solution.