VFD & Motor Drive Protection Solutions

VFD Protection Overview

Variable frequency drives (VFDs) are critical components in industrial automation and process control systems. Protecting these sophisticated power electronics requires specialized circuit protection that can withstand motor-starting inrush while providing rapid protection against destructive short circuits.

Application Challenges

High motor-starting currents that can be 6-10 times full load current
Sensitive semiconductor devices (IGBTs, diodes) requiring precise protection
Need for coordination between input and output protection
Harsh industrial environments with voltage transients
Continuous operation requirements in critical processes

Bussmann Solution

The Bussmann 170M series high-speed fuses provide the ideal solution for VFD protection applications. These current-limiting, fast-acting fuses feature precise I²t characteristics that coordinate with the VFD's short-circuit withstand capability.

Recommended Protection Strategy

Input Protection

170M series fuses sized according to VFD manufacturer recommendations for input protection against line-side faults.

DC Link Protection

Specialized fuses for DC link protection in case of internal VFD faults.

Output Protection

Appropriate protection between VFD and motor as recommended by VFD manufacturer.

BOM List: VFD Protection Components

Component	Bussmann Part Number	Specifications	Application
Input Protection Fuse	170M3819	600VAC, 100A, Class CC	100HP VFD Input
Input Protection Fuse	170M3815	600VAC, 60A, Class CC	75HP VFD Input
Input Protection Fuse	170M3811	600VAC, 35A, Class CC	40HP VFD Input
Mounting Block	C170M4	4-position, bolt-on	170M fuse holder
Fuse Block	BF170M4	4-position, bolt-on	170M fuse holder

Benefits of Bussmann VFD Protection

Precise Coordination

I²t curves carefully coordinated with VFD specifications to prevent nuisance interruptions while providing rapid protection during faults.

Semiconductor Safety

Fast operation and current limiting protect sensitive IGBTs and diodes from damage.

Reliability

Authentic Bussmann components ensure consistent performance in critical applications.

Global Support

As an authorized distributor, we provide worldwide technical support and availability.

Technical Resources

Need Custom Solution?

For unique applications or complex VFD systems, our application engineers provide custom protection solutions.

Contact Engineers

Bussmann Distributor