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Energy let-through for Type 2 MCB's ?

I'm nursing an elderly installation containing MK brand Type 2 breakers.

Does anyone have let-through energy curves for MK Type 2 32A MCB ? - Specifically LN5932.

Without any better data I'm likely to expect it to have I^2t no higher then a type C BS60898, and (based on 7x multiplier for instantaneous trip..), perhaps somewhere between a B and C? Is that a safe assumption?

I have curves for Wylex BS60898 and for one or two other brands.

It's a bit of hand-waving I'd sooner not do if there are measured curves somewhere out there?

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0 mapj1 over 3 years ago

It is a fairly safe assumption as that series including the LN5932 morphed into the more modern B and C breakers with little change except some new screen printing.

This article on what to assume about old breakers may be vaguely interesting . The basic gist is that old breakers are OK, if you know the characteristics.

Mike.
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0 mapj1 over 3 years ago

It is a fairly safe assumption as that series including the LN5932 morphed into the more modern B and C breakers with little change except some new screen printing.

This article on what to assume about old breakers may be vaguely interesting . The basic gist is that old breakers are OK, if you know the characteristics.

Mike.
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Energy let-through for Type 2 MCB's ?

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