Mersen: Motor Controller/Drive Applications Product Locator

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Provide the information requested below to help us find the right fuse for your application.

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What type of controller/drive do you have?
Provide a detailed description.

Is this a new application or a replacement for an existing protective device?
If replacing an existing protective device, provide:

For your application, what is the highest voltage the fuse must interrupt?

VAC RMS			Frequency
VDC			L/R time constant

What are the current rating/load characteristics?

Motor HP
Motor FLA (full-load amps)
Full-load amps through fuse
Motor starting current
Motor starting time
How often will the motor be started?

Is there a provision to operate the motor in bypass mode
(can the motor be started by bypassing the controller)?

Yes No
If yes:
What is the motor LRA (locked rotor amps)?

What is the motor starting time for full-voltage starting?

Are any other protective devices used in the circuit?

Yes No
If yes:
What type of device?
Device location?
Purpose?
Is coordination required between this device and the fuse? If yes, please describe.

What is the maximum available fault current
(amps RMS symmetrical)?

What is the minimum current that must open the fuse?

Is there a time requirement for this?

What type of semiconductor device will the fuse protect?

What is the I²t withstand of the device?
What is the PIV (peak inverse voltage) of the device?
Is I²t protection required or is the purpose only to minimize damage? I²t protection required Minimize damage only

What is the ambient temperature surrounding the fuse?
Is cooling provided? Yes No If yes, provide characteristics (forced air cooled — air flow speed; water cooled — provide specifics).

How is the fuse connected to the system?

What is the bus cross-section or cable size?

Additional Comments