Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 19 replies
  • Subscribers 37 subscribers
  • Views 1924 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

Energy let-through for Type 2 MCB's ?

justinneedham

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?

Parents
  • 0

    The 15th edition has time current charts for B.S. 3871 type 2. The breakers there, are though, 30 Amp rated.

    www.ebay.co.uk/.../648837690

    Edit. Add. The 16th edition has the curve for the 32 Amp breakers to B.S. 3871. It runs very close to the 30 Amp M.C.B. curve. Fig. 3.5.

    Time current characteristics for B.S. 3871. 

    0.1 to 5 seconds. 224 Amps. For a 32 Amp. M.C.B. Type 2.

    Z.

Reply
  • 0

    The 15th edition has time current charts for B.S. 3871 type 2. The breakers there, are though, 30 Amp rated.

    www.ebay.co.uk/.../648837690

    Edit. Add. The 16th edition has the curve for the 32 Amp breakers to B.S. 3871. It runs very close to the 30 Amp M.C.B. curve. Fig. 3.5.

    Time current characteristics for B.S. 3871. 

    0.1 to 5 seconds. 224 Amps. For a 32 Amp. M.C.B. Type 2.

    Z.

Children
  • 0 in reply to Zoomup

    And..........as I have found a M.K. LN5910 here I have read the details printed on it.  MADE IN ENGLAND. LICENSE SIEMENS.

    M3. Ref. calibrated temp 20 degrees C.

    Z.

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines