moeller

[shermaine]

May i know moeller: NZMB1-A80 can be used for voltage rating of 480V application?

 

[Mikebits]

Try looking on the moeller website.
**broken link removed**

 

[shermaine]

this item is meant for 440v, but if i want to use it in 480v, will it work?

 

[Willbe]

this item is meant for 440v, but if i want to use it in 480v, will it work?

480/440 is only ~10% higher, so IMHO, yes. Normal line variations probably go more than this.

 

[Roff]

this item is meant for 440v

I couldn't find a datasheet or anything else that says that. Can you provide a link to it?

 

[Mikebits]

**broken link removed**

 

[Roff]

**broken link removed**

That datasheet says that it will work down to 240VAC.

 

[Mikebits]

That datasheet says that it will work down to 240VAC.

And... not sure what your trying to say.

Those big electric specs confuse me. What the heck is 480y/240, also what is KA? Spec says instant trip @ 480-800. Is that to say 480VAC will trip the breaker?

 

[Roff]

And... not sure what your trying to say.

Those big electric specs confuse me. What the heck is 480y/240, also what is KA? Spec says instant trip @ 480-800. Is that to say 480VAC will trip the breaker?

I don't know anything about big circuit breakers. **broken link removed** says

New NZM Circuit Breakers provide excellent protection for control systems in applications from 1 to 1200A with a short-circuit breaking capacity of up to 150kA.

So, if the short-circuit current is way in excess of the trip current, they will still open (and not weld closed).
In a 3-phase wye source, if the individual vectors are 277V, the voltage between any two phases will be 480V. I think this is what 480Y/277 means. I think the 240 spec tells you that the guaranteed short-circuit break current is higher than for the 480Y/277, probably because power dissipation in the contacts determines the level at which they will weld themselves closed. You would think they would simply explode or vaporize.

 

[Willbe]

Yes, the 150 kA is the current interrupting rating.

My house service at 240v has an internal impedance of 1 mΩ so in principle it could supply 240kA under short circuit conditions.