VFD Motors

HVAC fans and compressors use variable frequency drive (VFD) motors. Ensuring the ac motors speed up and slow down predictably, safely, and efficiently prolongs equipment life. Littelfuse offers many electronic components to achieve that goal, including power bridges for current switching, transformers for ground fault protection, and motor protection relays technicians can monitor via smartphone.

Block Diagram

Technology:
Product Series:JLS, JLLS, LDC, 504, 505, 607
Features:Extremely current-limiting; small footprint; 200 kA interrupting rating; smallest available package
Benefits:Reduces damage to equipment caused by heating and magnetic effects of short circuit currents; compact design

Technology:
Product Series:TMOV, UltraMOV
Features:UL-recognized Type 4 surge protection devices; integrated thermal disconnect
Benefits:Integrated thermal disconnect enhances safety by disconnecting during MOV EOL caused by continuous abnormal overvoltage from miswiring or loss of neutral

Technology:
Product Series:
Features:Planar passivated chips; very low leakage current and forward voltage drop; improved thermal behavior; high commutation robustness
Benefits:Small footprint; multiple package options (high-voltage, isolated, and standard packages)

Technology:
Product Series:
Features:Sonic diode for fast and soft recovery
Benefits:Easy to parallel due to positive temperature coefficient

Technology:
Product Series:L50QS
Features:Extremely Current Limiting, Universal Blade Mounting
Benefits:Best-in-class DC performance, reduces peak let-through current and energy protecting power semiconductor components. Flexible mounting offering quick and easy field replacement

Technology:
Product Series:
Features:Rugged XPT design with thin wafer technology
Benefits:Short circuit rated for 10 ?sec; low gate charge; low EMI and competitive low VCE(SAT)

Technology:
Product Series:LSIC1MO170E0750
Features:Optimized for high-frequency applications; extremely low gate charge and output capacitance; ultra-low on-resistance
Benefits:Higher switching frequency; higher efficiency; increased robustness; smaller die size per voltage/current rating