Author Topic: Merlin Gerin Masterpact M16N1 - 1600A Circuit Breaker Test  (Read 3947 times)

Offline Mads Barnkob

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Merlin Gerin Masterpact M16N1 - 1600A Circuit Breaker Test
« on: April 05, 2021, 09:08:00 PM »
I got hold of a large Merlin Gerin Masterpact M16N1 circuit breaker, from 1997, from a low voltage distribution drawout system. In the video you get a inspection of the various parts of the breaker and I have some fun making it work and test it!

/>
It was a deal to get it now or miss it, so I had to transport the damn thing of around 50kg home on my bicycle, good thing I only had to balance it for a 2 km walk :)



Some product series data:
Quote
The Masterpact M series circuit breaker is used to protect and control low voltage distribution systems. It can be installed in main LV switchboards (incoming units, main and secondary outgoers).
Nominal current: 800 to 6300A AC
Breaking capacity from 40 to 150 kA rms
Voltage rating: up to 690 V
Versions: 3 and 4-pole. Fixed or drawout.

The front of the unit had a crank for charging the internal spring, ON/OFF buttons, short-circuit curve settings, indicators and a hidden timer setting PCB. The undervoltage- and remote operation coils can be seen as the two cylindrical parts at the top.


Underneath the large and dangerously powerful spring can be seen.


This version also has a motor assisted charging mechanism, that can be used for remote closing of the breaker.


One of the Arc suppressors/chimneys


Inside the switching chamber where the arc suppressor mounts down into. The 10 copper arms that can be seen are not the main contact points, these are silvery and can be sen lower down and fits with the 10 dark square marks that can be seen in the wear-surface of the output terminal.


I could not find a manual for this rather old unit, so I had to find some manuals from the more modern versions and it did share the same schematics, I just had to find the right terminals.



The hidden timer settings PCB is a configuration of the maximum permissible time between undervoltage coil activation (MN) and closing release (XF) activation, if this time is passed, the breaker will not close. I properly need some other conditions to keep it closed, but for the tests I want to do, a closing and opening with a 3 second time is perfect!

« Last Edit: April 05, 2021, 09:10:32 PM by Mads Barnkob »
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Offline rikkitikkitavi

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Re: Merlin Gerin Masterpact M16N1 - 1600A Circuit Breaker Test
« Reply #1 on: April 12, 2021, 07:58:14 AM »
Nice.

I remember once when we replace the 1MW drive for a quite large fan at my previous work. Racks upon racks with 400V Rifa PEH169 and hockey puck thyristors. And the contactor...

BTW you should get one of these :
https://www.christianiabikes.com/uk/product/model-30/#box

That child seat is NOT certified for 50kg :)

And of course a complete teardown, followed by a complete modification of the cargo bike.
A man can not have too many variacs

Offline Mads Barnkob

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Re: Merlin Gerin Masterpact M16N1 - 1600A Circuit Breaker Test
« Reply #2 on: April 13, 2021, 09:10:28 PM »
This is the circuit breaker filmed at 4000 frames per second!

/>
That child seat is NOT certified for 50kg :)

It gently rests on the saddle, perfectly safe! ;)
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Offline Mads Barnkob

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Re: Merlin Gerin Masterpact M16N1 - 1600A Circuit Breaker Test
« Reply #3 on: April 23, 2021, 09:08:57 AM »
Some more high speed video recordings and this time with some high current flowing!

Merlin Gerin C10A MCB vs. Merlin Gerin Masterpact 1600A to withstand a 50kA discharge from my 4kJ capacitor bank: https://kaizerpowerelectronics.dk/pulse-power/4000-joule-capacitor-bank/

/>
Aluminum foil bunny explosion


Merlin Gerin C10A explosion


Damage to the Merlin Gerin C10A MCB after the explosion


Damage to the Merlin Gerin Masterpact 1600A switching surfaces
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Offline Mads Barnkob

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Merlin Gerin Masterpact M16N1 Teardown
« Reply #4 on: February 21, 2022, 07:41:55 PM »
This is the complete destruction and teardown of the Masterpact M circuit breaker.

/>
The six 800 mm2 connects to the ingoing and outgoing busbars. Each piece of busbar is exchangeable with a spare parts as these see very high wear from switching loads on and off.





The current transformers of the Masterpact M16N1 teardown are marked 1600A.



The main CPU and controller IC of the Merlin Gerin Masterpact M series current sensing circuit is a NEC D75116. It is a 4-bit single-chip microcomputer.

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Merlin Gerin Masterpact M16N1 Teardown
« Reply #4 on: February 21, 2022, 07:41:55 PM »

 


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