Schneider MCCB suitable for Tunnel environment

[Kuratong007]

Providing electric power for a tunnel contractor for their tunnel boring activities is not a common project to have. I'm humbly asking your expertise to help me what MCCB suits to a tunnel borer that requires the following requirements?:

a. 1,140 Volts, 3phase, Supply Voltage

b. 60 Hz Supply but equipment is rated 50 Hz

c. Minimum 400 AT with adequate frame size

d. With a Trip Curve suitable for tunnel boring machine

e. Rugged to withstand underground conditions (Yes this will be enclosed to an appropriately NEMA-rated enclosure I just want the Circuit Breaker to be rugged type if it is possible)

Optional: 100% rated

If ever MCCB is underrated for this type of application, feel free to suggest a better overload and short circuit protection for this machine.

Thank you so much!

[Gregoire_Brun · Accepted solution]

hello

We have launched a device close to your request

Name of this product is NSX 400K

C40K32D400 - Circuit breaker, ComPacT NSX400K, 36kA/800VAC, 10kA/1000VAC, 3 poles, MicroLogic 2.3 tr...

Nominal voltage current is 1000V 50/60 Hz.

It’s certified IEC 60947-2

Trip curve can be adjusted like on other standard electronics trip units of our range.

Hope it can be suitable for your application.

Gregoire

[Kuratong007]

Hi @Gregoire_Brun !

How are you? Sorry for this late reply. The development of the project was temporarily paused a few weeks ago. Now, it was back to the table again.

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Nominal voltage current is 1000V 50/60 Hz.

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I think the reliability of the Circuit Breaker will be put in question if its voltage rating is 1000V while the nominal voltage where it will be installed is 1,140V.

Do we have an alternative model for this application? What is the next higher voltage rating of your Vacuum/Air Circuit Breakers?

Thank you!

[Gregoire_Brun]

hello @Kuratong007 

1140V value is a challenge compare 1000V ...

unfortunatly other breaker for this needed are MasterPact MTZ2....

Please contact me by Email to discuss about alternative solution eventualy possible