LT3400T - 400 Amp Trip Unit

LT3400T - 400 Amp Thermal-Magnetic Trip Unit

Offer your electrical system strong, dependable protection with the Eaton LT3400T, a high-performance thermal‑magnetic trip unit designed to pair seamlessly with J‑K frame molded‑case circuit breakers. Rated for 400 amps and up to 600 volts, this three‑pole unit delivers dependable safety against overloads and short circuits. Think of it as the “brain” that keeps things running smoothly—slot it into the right breaker frame and let it handle the heavy lifting.

Key Features and Benefits

• 400 Amp Capacity & 600 V Rating: Built to manage heavy-duty current and voltage demands, ideal for demanding commercial and industrial systems.
• Thermal‑Magnetic Protection: Offers dependable response to both heat stress from overloads and sudden high fault currents, helping to protect your equipment and prevent downtime.
• Non‑Interchangeable Design: Ensures the correct trip unit stays in place, reducing misfit replacements and preserving system safety.
• Compact, Lightweight Build: Easy to install and retrofits neatly into existing setups without adding unnecessary bulk.

Technical Specifications

• Amperage Rating: 400 A
  
• Voltage Rating: 600 V
  
• Trip Type: Thermal‑Magnetic
  
• Frame Size: J‑K Frame
  
• Poles: 3
  
• Dimensions:
  • Length: 8.7″
  • Height: 5.7″
  • Width: 5.3″
• Weight: 2.65 lb
  

Material Compliance and Certifications

• UL Listing: This trip unit carries UL Listing, meaning it meets top-tier safety and performance standards that electricians and engineers trust.

Suitability

• Ideally suited for commercial and industrial electrical panels where managing high current loads is crucial, the Eaton LT3400T delivers precise, reliable protection in manufacturing sites, large office complexes, and any space where electrical demand is high and steady. If you’ve got a J‑K frame breaker in your lineup, this trip unit is the ideal match.