Siemens QJ23B200 Molded Case Circuit Breaker

This bolt-on breaker installs directly into Siemens P1, P2, and P3 panelboards, as well as compatible Siemens switchboards and meter centers.

The QR23B200 is the current factory substitute for this breaker. Siemens updated the QJ frame to the QR frame, which shares the same footprint and general applications but offers newer technical upgrades.

Yes, QR frame breakers like the QR23B200 act as direct replacements for older QJ models in most panelboards. Note that replacing a QJ breaker in some older power panels or distribution switchboards may require a retrofit field kit (such as the SQRC kit) to adapt the mounting hardware.

Yes, this breaker supports reverse feed installations. Because it features a non-interchangeable trip unit, power can safely flow from the load side to the line side without impacting its protective capabilities.

Yes, the QJ23B200 is HACR rated. This certification means it is approved to protect heating, air conditioning, and refrigeration equipment circuits.

Yes, this model includes mechanical load side lugs. They accept 6 AWG to 300 kcmil copper wire or 4 AWG to 300 kcmil aluminum wire.

It is a unit mount, bolt-on circuit breaker. The line side connects directly to the panelboard bus using bolted straps, providing a secure, high-contact-pressure connection required for heavy commercial loads.

No, the QJ frame series uses a non-interchangeable thermal-magnetic trip unit. The 200A trip settings are fixed at the factory and cannot be removed or modified in the field.