Old mem mcb type

[graham123]

Hi all, anybody come across these mem mcbs. Don't know what type they are. All it has on them is 3871 part 1. Apologies for the picture will upload a better one tommorow. cannot even find anything on Google or eBay.

 

[stefan]

yes ive got 25 years on the job

 

[spark 68]

what you getting at ?thats what ive said type 2 common like type B are now high zs is fine with theses look it up type B whats the max zs type c whats the max zs same as type 1 and type 2 different values today high zs i would use a type B yes are you understanding not a type c
when these mcbs in the photo were made there was the same type 2 common type 1 not common

No they are not the same at all

Type 1 are X4 In, Type B are X5 In
Type 2 are X7 In, Type C are X10 In
Type 3 are X10 In Type D are X20 In
Type 4 can be various depending on manufacturer

If anything Type 3 are roughly equivalent to type C

 

[Leesparkykent]

yes ive got 25 years on the job

Cool!!

 

[frontier219]

yes ive got 25 years on the job

And for how many of those years have you been complacent in recording circuit details?

 

[Charlie_]

Type 1 were actually the most common as they were classed as resistive mcb's..

pop quiz... No cheating! Googling or whatever your preferred cheat is!
we have mentioned types b,c & d but not type a.
why are type a MCBs so special??? No cheating!

 

[Leesparkykent]

Type 1 were actually the most common as they were classed as resistive mcb's..

pop quiz... No cheating! Googling or whatever your preferred cheat is!
we have mentioned types b,c & d but not type a.
why are type a MCBs so special??? No cheating!

well I don't know and not going to cheat either lol.

 

[stefan]

OK so do ya want a gold medal

 

[frontier219]

Type 1 were actually the most common as they were classed as resistive mcb's..

pop quiz... No cheating! Googling or whatever your preferred cheat is!
we have mentioned types b,c & d but not type a.
why are type a MCBs so special??? No cheating!

Genuinely didn't know they existed! Do tell, I'm intrigued.

 

[Leesparkykent]

OK so do ya want a gold medal

Jog on mate you are getting boring!

 

[Charlie_]

Haha I said what's special about them?
trick question... They don't exist...
the reason why, is because when they done away with the old codes in the 90's
the powers that be didn't want the type getting confused with the current rating A..

 

[stefan]

You challenge my comment I put my opinion across type 2 if you don't like it that's up to you how much experience have you in this field think you should go on the diy forum

 

[spark 68]

No they are not the same at all

Type 1 are X4 In, Type B are X5 In
Type 2 are X7 In, Type C are X10 In
Type 3 are X10 In Type D are X20 In
Type 4 can be various depending on manufacturer

If anything Type 3 are roughly equivalent to type C

Actually this is not strictly true, the types B,C and D have a range of magnetic trip currents, which extend to the letter below, Type B = 3 to 5 X In, Type C = 5 to 10 X In, and Type D = 10 to 20 X In, just we use the highest number multiplier as the worst case.

The older standard has a different range which I would need to look up the numbers quoted for Types 1 to 3 are the worst case for that standard, which is all I am really bothered about anyway

I have no idea about Type A, I don't even know if they exist or not lol

 

[frontier219]

You challenge my comment I put my opinion across type 2 if you don't like it that's up to you how much experience have you in this field think you should go on the diy forum

If you're not a troll then I despair for your customers. 'Type 2' is not your informed opinion through your years of knowledge. It is an uneducated guess based on the flimsiest of conclusions.

 

[stefan]

OK what ever

 

[Charlie_]

Type 1..2.7 - 4In
Type 2..4 - 7In
Type 3..7-10In
Type 4...10 - 50In