Siemens 3VA5450-6EC31-0AA0 Molded Case Circuit Breaker

This 3VA54 frame breaker is the modern, direct replacement for legacy Sentron HLD63B500 and HLXD63B500 circuit breakers. It matches the 500A continuous current and Class H interrupting rating of 65kA at 480VAC.

The number 6 in the part number 3VA5450-6EC31-0AA0 designates it as a Class H, or High Interrupting, breaker. This guarantees a fault clearing capacity of 100kA at 240VAC, 65kA at 480VAC, and 25kA at 600VAC.

The integrated TM230 trip unit provides thermal-magnetic protection. It features a fixed thermal rating of 500 amps for overload protection and an adjustable magnetic dial for instantaneous short-circuit protection, allowing electricians to tune the fault response.

Yes, Siemens 3VA5 thermal-magnetic breakers are rated for direct current applications up to 500VDC. When applying this three-pole breaker on a 500VDC ungrounded system, poles must be wired in series, often called a zig-zag configuration, following the manufacturer manual.

While it installs natively into modern Siemens 3VA panelboards and switchboards, retrofitting it into an older enclosure to replace a legacy LD-frame breaker requires an updated branch breaker strap kit designed specifically for the 3VA54 footprint.

The 3VA5450-6EC31-0AA0 utilizes the Siemens 3VA54 600-amp frame but is equipped with a 500-amp thermal trip unit. This allows it to physically mount in standard 600-amp enclosure spaces while specifically protecting 500-amp branch circuits.

Depending on the exact lug kit installed on the breaker, standard single-conductor aluminum or copper lugs for the 3VA54 frame accept 1 AWG to 600 kcmil wire. Dual-conductor lug options are also available for running parallel cables.