ABB NBD400H3400 MCCB Circuit Breaker

Feature & Principle

It adopts thermal-magnetic trip mechanism. Thermal element responds to long-time overload for delayed protection, magnetic trip triggers instantaneous cut-off when short circuit occurs. It isolates fault circuit rapidly to avoid cable burnout and equipment damage in low-voltage distribution system.

Specifications

Model: NBD400H3400 Brand: ABB Pole: 3P Rated current: 400A Breaking capacity: H grade Trip type: Thermal magnetic Voltage: 400V AC Mounting: Fixed installation Certification: CE, IEC

Components & Diagnostics

Contact assembly, thermal bimetallic strip, magnetic release, arc extinguishing chamber, operating handle. Common faults: cannot close, tripping frequently, arc extinguishing chamber burnout, contact overheating, trip failure.

Product Brief

NBD400H3400 molded case circuit breaker, ABB electrical spare widely used for factory power distribution cabinet, pump and fan power loop protection and replacement.