Siemens QRH22B150 Molded Case Circuit Breaker

Yes, the QR-frame is the direct successor to the legacy QJ-frame. The QRH22B150 serves as a drop-in replacement for discontinued 150A models like the QJ22B150 and QJH22B150. When retrofitting into older P4, P5, or SB switchboards, an SQRC retrofit kit may be required to match the existing deadfront cutouts.

Yes. A major upgrade from the legacy QJ series is that 2-pole QR-frame breakers feature an internal pocket, allowing electricians to field-install accessories such as shunt trips and auxiliary switches without ordering a custom factory build.

This bolt-on molded case circuit breaker mounts directly into Siemens P2 and P3 panelboards. It can also be installed in P4 and P5 power panels and SB switchboards when used with the appropriate branch mounting hardware.

No, this breaker utilizes a fixed thermal-magnetic trip unit. Both the long-time thermal overload and instantaneous magnetic short-circuit trip functions are factory set and cannot be adjusted in the field.

The standard mechanical lugs accept either copper or aluminum conductors ranging from 1/0 AWG to 300 kcmil. Always apply the correct torque specified on the breaker label to prevent thermal issues at the termination.

The QRH22B150 features a push-to-trip button on the front faceplate. Pressing this button manually actuates the tripping mechanism, allowing you to safely verify that the internal contacts open and the handle moves to the tripped position.