Supplied with factory-installed line and load lugs, the Siemens HFXD63B125L operates as a high-performance 3-pole, 125A molded case circuit breaker. Part of the Sentron FD frame series, it delivers a robust 65kAIC interrupting rating at 480VAC and 25kAIC at 600VAC. This unit mount breaker provides dependable long-time and instantaneous (LI) thermal-magnetic trip protection. It is designed for seamless integration into Siemens enclosures and switchboards across commercial facilities.
What panelboards and switchboards are compatible with the HFXD63B125L?
This Sentron FD-frame breaker mounts into Siemens P1, P2, P3, P4, P5, S4, S5, SPP, and FPP panelboards, as well as standard Siemens switchboards and enclosures. Note that a separate strap kit or mounting hardware kit specific to your panelboard is required for installation.
What does the "L" in the HFXD63B125L catalog number indicate?
The "L" suffix indicates that the breaker is supplied with factory-installed line and load lugs. The standard HFXD63B125 catalog number does not include lugs and requires them to be purchased separately.
What is the difference between the FXD6 and HFXD6 series breakers?
The "H" in HFXD6 designates a high interrupting capacity. The HFXD63B125L is rated for 65kAIC at 480VAC, whereas the standard FXD6 series is typically rated for 35kAIC at 480VAC.
Can the Siemens HFXD63B125L be reverse fed?
Yes. As a standard thermal-magnetic molded case circuit breaker without specific Line and Load markings, it is suitable for reverse feed applications.
Is the HFXD63B125L HACR rated?
Yes, this breaker is HACR rated, meaning it is certified for use with heating, air conditioning, and refrigeration equipment.
Does the HFXD63B125L include trip functions for ground fault protection?
No. This breaker features a standard thermal-magnetic trip unit with long-time and instantaneous (LI) functions for overload and short-circuit protection. It does not provide ground fault protection.
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