Engineered for demanding commercial and industrial applications, the Siemens SHLD69400NGT provides robust circuit protection with its Sensitrip III electronic trip unit. This 400A, 3-pole molded case circuit breaker delivers 65kAIC at 480VAC and features adjustable Long-Time, Short-Time, Instantaneous, and Ground Fault (LSIG) settings. Designed as a bolt-on LD frame, it installs into Sentron panelboards. It is replaced by the 3VA6340-6JQ31-0AA0, which requires a strap kit.
HACR Rated, High Interrupting Capacity, Trip-Free Mechanism
Product FAQs
7 answers
Which Siemens distribution equipment accepts the SHLD69400NGT breaker?
This LD frame breaker is engineered for bolt-on installation in Siemens Sentron panelboards, switchboards, and motor control centers.
Can I install this breaker in a standard Siemens residential load center?
No. The SHLD69400NGT is a large LD frame molded case circuit breaker designed for heavy commercial and industrial use. It will not fit in standard residential load centers.
What adjustments are available on the SHLD69400NGT trip unit?
This breaker features a Sensitrip solid state electronic trip unit with fully adjustable LSIG functions. This allows electricians to fine-tune Long-Time, Short-Time, Instantaneous, and Ground Fault settings for precise selective coordination.
Does this breaker provide equipment ground fault protection?
Yes, the G in the LSIG trip designation indicates that this breaker includes integral ground fault protection. This is often required for specific downstream equipment protection or to meet NEC requirements for certain 480V services.
Is the SHLD69400NGT suitable for high fault current applications?
Yes. The H in the SHLD prefix designates it as a high interrupting breaker. It provides a 65kAIC rating at 480VAC and a 35kAIC rating at 600VAC, making it suitable for commercial and industrial systems with substantial available fault current.
What conductor materials and sizes are supported by the SHLD69400NGT terminals?
The breaker is equipped with factory lugs that accept both copper and aluminum wire. The acceptable conductor range is 3/0 AWG to 500 kcmil.
What is the direct replacement for the legacy SHLD69400NGT?
Siemens has transitioned the legacy Sentron LD frame to the modern 3VA series. The direct functional replacement is the 3VA6340-6JQ31-0AA0, though a specific strap kit will be required to retrofit it into an existing Sentron panelboard.
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