Littelfuse Solutions for Motor Drives & Soft Starters
Littelfuse and IXYS Solutions for Industrial Motor Drives and Soft Starters offer protection and control components to help improve motor life and energy efficiency in industrial applications. Variable frequency drives (VFDs) control AC motor speed and torque by varying motor input voltage and frequency. Soft starters offer smooth start and stop operation for a motor. VFDs and soft starters work on the same principles, but they employ different architectures and serve different applications. VFDs can be programmed to vary the speed of the motor based on flow, pressure, and other factors. VFDs are used in elevators, escalators, crushers, mixers, and more. Soft starters get bypassed by a contractor overload circuit as a motor reaches its full speed. Soft starters are ideal for conveyors, pumps, and other belt-driven applications. These Littelfuse and IXYS motor drives and soft starters conform to global and North American safety standards.
VFDs & Auxiliary Power Supplies
The VFD lineup features fuses, diodes, and MOVs that protect equipment against various surges, including overload, short-circuit, transients, and lightning. The rectifiers convert AC line voltage to DC, while the IGBTs limit the DC bus voltage by switching the braking energy to a resistor. The IGBTs act as power inverters, and the NTC sensors indirectly measure the temperature of the power inverter semiconductor switches.
1. AC Input Protection - Fuses and Fuseholders 5. Inverters - Semiconductor Fuses
2. AC Input Protection - MOVs 6. Inverters - IGBT Modules, SMPDs, NTCs, and TVS Diodes
3. Rectifiers 7. Auxiliary Power Supplies
4. Brake Choppers 8. Switches
Soft Starter Topology
The soft starter products feature fuses, MOVs, SCR modules, thermistors, and switches. The fuses are designed for the supplementary protection of diodes, SCRs, IGBTs, and more. The SCR modules control the application of supply voltage to the motor, while the NTC sensors indirectly measure the temperature of the power inverter semiconductor switches. The MOVs protect equipment from damage caused by lightning-induced surges or harmonic voltage disruptions from the power line.
1. AC Input - AC Fuses 4. Phase Control - NTCs
2. AC Input - MOVs 5. Phase Control - Switches
3. Phase Control - Dual and Discrete SCRs, and Stack
Safety Standards
Featured Products
Littelfuse TMOV Thermally Protected Varistors
Radially leaded MOVs with thermal element for surge-protection module compliance to UL1449.
Littelfuse PSR High-Speed Square Body Fuses
Specially designed for the protection of power semiconductor devices.
IXYS UL Recognized Rectifier Modules
Single- or dual-diode modules with 800V to 2200V repetitive peak reverse voltage and DCB technology.
IXYS Single- & Dual-Thyristor Modules
Single- or dual-thyristor modules with 800V-2200V repetitive peak reverse voltage, DCB technology.
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