The Siemens HLXD63B400 is a 3 Pole thermal magnetic molded case circuit breaker with a current rating of 400 Amps and a voltage rating of 600VAC. It has an interrupting rating of 65kAIC at 480VAC. The HLXD63B400 has a feed-thru connection type and includes long time and instantaneous trip functions.
High Interrupting Capacity, Non-Interchangeable Trip, HACR Rated
Product FAQs
6 answers
What is the difference between Siemens HLD and HLXD circuit breakers?
The HLXD series, including the HLXD63B400, features a factory-sealed, non-interchangeable trip unit. Standard HLD breakers have interchangeable trip units. The non-interchangeable design is required by UL for reverse-feed applications.
Can the Siemens HLXD63B400 be reverse fed?
Yes. Because it is manufactured with a non-interchangeable trip unit, this breaker is UL Listed for reverse-feed applications.
What is the standard lug wire range for this 400A LD-frame breaker?
When fitted with standard TA2J6500 mechanical lugs, the breaker accepts two 3/0 AWG to 500 kcmil copper or aluminum conductors per phase.
How is the trip unit configured on the HLXD63B400?
It features an LI (Long-Time and Instantaneous) thermal-magnetic trip unit. The thermal protection for overloads is fixed at 400 amps, while the magnetic protection for short circuits is adjustable from 2000 to 4000 amps.
Is the HLXD63B400 a 100% rated circuit breaker?
No, this is a standard 80% rated breaker. For a 100% rated version of this breaker, a special catalog number with an H suffix is required, and it must be installed with 90-degree Celsius copper wire sized at the 75-degree ampacity.
Can this 3-pole breaker be used in a single-phase application?
Yes. When applying this 3-pole breaker in a single-phase system, Siemens recommends wiring across the two outside poles.
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