Electrical Draw Out

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what is the meaning and difference between ELECTRICAL ...

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NFPA 70: National Electrical Code®

Electrical Circuit Breakers - Mike Holt Enterprises

Draw-out with regard to breakers is usually referring to Medium Voltage and High Voltage equipment, in which case MCCBs do not apply. In MV Metal Clad Switchgear where one would use draw-out mechanisms on Vacuum Circuit breakers (VCBs), I have never heard of "electrical draw-out" per se, but there is such a thing as "remote racking" mechanisms. All it is is a motor operated replacement for the hand crank used to withdraw the VCB from the structure. Instead of being right in front of the breaker to turn the crank that withdraws it, you attach the motor mechanism and stand far away, so that if the breaker has a fault and creates an arc flash, you are outside of the blast area.

Close racking video showing the dangers. You can see that the worker is turning a crank which is withdrawing the MV breaker from the switchgear (warning, not pretty and the protagonist dies):

http://www.youtube.com/watch?v=4bBvmPRqfmo

Newer safer remote racking mechanism for MV breakers.

http://www.youtube.com/watch?v=IburZAlAnN4

Siemens makes a draw-out mechanism that can be added to their VL Series MCCBs, but it is strictly a manual device. See pages 6 and 7 of this file. But as far as I know, there is no motorized operator available for this however.

Rockwell (Allen Bradley) has a feature in their Low Voltage Motor Control Centers called SecureConnect that allows you to withdraw the power stabs from a bucket prior to opening the door. The MCC buckets can be Feeder Circuit Breakers, so those would technically be MCCBs. The mechanism is on the bucket, not the breaker. In that offering, they too have an optional remote motorized operator that attaaches to the front and takes the place of the manual tool so that you can operate it from outside of the arc flash boundary.

http://www.youtube.com/watch?v=P3ZjDvr1QVI

Thanks JR

I've got to renew my HV ticket soon. That cheered me up.

Not!

Electrical Draw-out is a misnomer. There is no such thing called electrical draw out. All draw out mechanisms are manual only.

In fact the terminology is a combination meaning that the breaker is a (manual) draw out version and that the operations like spring charging, closing, opening are through electrical means.