Designed for demanding industrial environments, the Siemens NXD63B100 is a robust 1000A, three-pole molded case circuit breaker. It delivers reliable thermal-magnetic protection with long-time and instantaneous (LI) trip functions for power systems. This bolt-on ND-frame breaker installs into Siemens P4 and P5 panelboards, switchboards, and motor control centers. With a 65kAIC rating at 240V, the HACR-rated unit features a non-interchangeable trip and reverse feed capabilities.
Is the Siemens NXD63B100 breaker capable of being reverse fed?
Yes. Because this breaker is built with a non-interchangeable thermal-magnetic trip unit, it is UL listed for reverse feed applications.
What standalone enclosures are compatible with this 1000A ND-frame breaker?
The NXD63B100 can be installed in Siemens Sentron enclosures designed for ND frames, such as the NEMA 3R rated MND612 or MND63.
Which lug kits are required for terminating the NXD63B100?
If not ordered with factory-installed lugs, this ND-frame breaker accepts standard Siemens lug kits like the 3TA4N8500 or 3TA4P8500. Two kits are required per breaker to cover both the line and load sides.
How do I adjust the trip settings on the NXD63B100?
This breaker features a fixed thermal (Long-Time) pickup and an adjustable magnetic (Instantaneous) trip dial. You can adjust the magnetic threshold using the dial on the face of the trip unit to coordinate with downstream devices or handle motor inrush currents.
What is the difference between the NXD63B100 and the ND63B100?
The NXD63B100 is built with a non-interchangeable trip unit, which is required for reverse feeding applications. The ND63B100 is the interchangeable-trip version of the exact same 1000A, 3-pole Sentron ND-frame breaker.
What do the H and L suffixes indicate on similar Siemens catalog numbers like NXD63B100H or NXD63B100L?
The H suffix designates a 100-percent continuous current rating, whereas the standard NXD63B100 is rated for standard 80-percent continuous use. The L suffix indicates the breaker is supplied from the factory with pre-installed line and load lugs.
Is the Siemens NXD63B100 HACR rated?
Yes, this breaker is HACR rated, meaning it is certified and suitable for protecting multi-motor heating, air conditioning, and refrigeration equipment.
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