Siemens QJ23B090 - 90 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Siemens QJ23B090 is a 90A, 240V, 3-pole bolt-on molded case circuit breaker designed to protect branch circuits from overcurrent and short circuits in panelboards and loadcenters.

Built for reliability, this unit features a secure bolt-on mounting that delivers a rigid, vibration-resistant bus connection, reducing movement and interruptions in demanding electrical environments. Its thermal-magnetic trip unit provides stable, repeatable protection performance, instantly reacting to short circuits while handling routine overloads with dependable precision.

Designed to integrate seamlessly with matching OEM Siemens loadcenters and panelboards, the QJ23B090 offers a clean, OEM-compatible replacement path for aging breakers and for new installations alike. It’s suitable for residential, commercial, and light industrial applications, making it a versatile choice for electricians and facilities managers.

Key specifications

• Amperage: 90 A
• Voltage: 240 V
• Poles: 3
• Mounting: Bolt-on
• Type: Thermal-magnetic molded case circuit breaker
• Application: Branch circuit overcurrent and short-circuit protection
• Manufacturer: Siemens
• Part number: QJ23B090

Who benefits from the Siemens QJ23B090

• Electricians replacing or upgrading panelboards and loadcenters with Siemens-compatible breakers
• Facilities teams managing mixed residential/commercial spaces needing reliable 3-pole protection
• Installers seeking a robust, vibration-resistant solution for equipment racks, service panels, or distributed electrical rooms

Why choose this bolt-on breaker over other options? The bolt-on design delivers a secure connection that resists loosening from vibration, while the thermal-magnetic trip unit ensures predictable interruption behavior across fault types. When paired with compatible OEM Siemens panel boards, you gain a streamlined installation with consistent trip curves and documented protection performance.

Available from AmpState, a trusted source for Siemens electrical protection products, the QJ23B090 is ready to ship for your next installation or retrofit project. Add it to your cart and equip your panel with proven Siemens protection that you can rely on day after day.