Built for heavy-duty applications, the Eaton HLD3400 operates as a 400A, 3-pole molded case circuit breaker. As part of the Series C L-Frame lineup, it delivers dependable long-time and instantaneous (LI) protection for industrial systems. Designed for panel mount configurations, this breaker installs into Eaton Series C panelboards, switchboards, and motor control centers.
High Interrupting Capacity, HACR Rated, Reverse Feed
Product FAQs
8 answers
What enclosures and equipment are compatible with the HLD3400?
The HLD3400 is designed for panel mount installations in Eaton Series C panelboards, switchboards, and motor control centers.
What does the H in the HLD3400 catalog number indicate?
The H designates this as a High Interrupting Capacity breaker. It provides a 65kAIC rating at 480 VAC, which is higher than the standard LD3400 model.
Can the HLD3400 be used in DC voltage applications?
Yes, this thermal-magnetic breaker is rated for up to 250 VDC with an interrupting capacity of 25kAIC, making it suitable for specific direct current systems.
Is the HLD3400 suitable for reverse feed applications?
Yes, as a standard thermal-magnetic Series C circuit breaker without line and load restrictions, the HLD3400 can be reverse fed.
Can the HLD3400 replace older Westinghouse or Cutler-Hammer HLD breakers?
Yes, Eaton acquired the Cutler-Hammer and Westinghouse distribution equipment lines. The HLD3400 shares the exact same physical footprint and L-Frame design, making it a direct drop-in replacement for legacy models with the same catalog number.
Is the HLD3400 100% rated for continuous current?
No, the standard HLD3400 is 80% rated for continuous current. For applications requiring a 100% continuous current rating, a different breaker variant is required.
What wire sizes are accepted by the standard lugs on this breaker?
The standard pressure line and load terminals accept two aluminum or copper conductors ranging from 3/0 AWG to 350 kcmil per phase.
What type of trip unit is installed in the HLD3400?
It features a fixed thermal and fixed magnetic trip unit, providing Long-Time and Instantaneous (LI) protection functions without the need for external trip adjustments.
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