Siemens HJD63B350 Molded Case Circuit Breaker

This JD-frame breaker fits into Siemens P4 and P5 panelboards, SB switchboards, and motor control centers. When installing in a panelboard, you must use the appropriate strap kit or mounting hardware assembly for your specific enclosure.

Yes. This thermal-magnetic breaker does not feature line and load markings, making it suitable for reverse-feed applications in systems that require backfeeding.

Yes. The HJD63B350 is the high-interrupting version of the standard JD63B350. It shares the exact same physical footprint and mounting dimensions, but offers a higher short-circuit rating of 65kAIC at 480VAC.

This breaker features a fixed long-time thermal element and an adjustable instantaneous magnetic trip function. The magnetic pickup is adjusted using a small dial located on the front face of the trip unit to match your load coordination requirements.

The standard mechanical lug kit is the Siemens TA2J6500, which features aluminum-bodied lugs rated for both copper and aluminum wire. If your application requires copper-bodied lugs, you can order the TC2J6500 lug kit.

No. The HJD63B350 is a unit-mount, bolt-on circuit breaker. It must be mechanically bolted directly to the bus bar or mounting plate rather than using a plug-in connection.

You should specify the HJD frame when your electrical system has a higher available fault current. The HJD63B350 provides enhanced safety with an interrupting rating of 65kAIC at 480VAC, which is required to safely clear severe short circuits that a standard 35kAIC breaker cannot handle.