Siemens FD63B150 Molded Case Circuit Breaker

Yes. Siemens acquired ITE and retained the exact same catalog numbers for this frame. A new Siemens FD63B150 is a direct, UL listed replacement for an original ITE FD63B150 circuit breaker.

The standard FD63B150 catalog number is supplied with mechanical lugs on both the line and load terminals. These standard lugs, typically known as the TA1FD350A lug kit, accept 6 AWG to 350 kcmil copper or 4 AWG to 350 kcmil aluminum conductors.

Yes. To install the FD63B150 as a main or subfeed breaker in a Siemens P1 panelboard, you will need a dedicated main or subfeed mounting kit, such as the MBKFD1 or MBKFD3A, depending on your exact panel generation and configuration.

The interchangeable trip design means the thermal-magnetic trip unit is not permanently sealed into the frame. If your load requirements change, the trip unit can be removed and replaced with a different amperage rating without swapping the entire breaker block.

Yes. In addition to its AC ratings, the FD63B150 is rated for 500 VDC applications with a maximum interrupting capacity of 18 kA. Always ensure your specific DC system design and wiring configuration comply with Siemens application guidelines.

Yes. This Sentron FD frame breaker is backward compatible with a variety of older Siemens and ITE switchboards and motor control centers, provided the equipment accepts FD6 frame unit mount breakers and you have the correct mounting hardware.

The FD63B150 features fixed thermal overload protection and an adjustable magnetic instantaneous trip. The instantaneous trip dial allows licensed electricians to fine-tune the short-circuit response based on specific motor starting currents or coordination requirements.

No. The FD63B150 is a unit mount molded case circuit breaker. It is strictly designed to be bolted directly to a backpan, switchboard chassis, or panelboard mounting assembly, and will not fit on a standard DIN rail.