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Topic Title: gG & gM Fuses
Topic Summary: Interpretation
Created On: 14 September 2017 10:00 AM
Status: Read Only
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 14 September 2017 10:00 AM
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Apostolos1983

Posts: 91
Joined: 03 December 2012

Hi.
I have in front of me a pdf on gG & gM fuses BS88-2 compliant.
I do not understand why the gM fuses have 2 numbers.
For example there is a table for typical motor sizes.
According to this a 7.5kW motor DOL has In=14A and the pdf suggests to use either a gG 40A or a gM 32M40.
What is this 32M40?

Also, when we say that we will use a 40A BS88-2 to protect a VSD for example, do we mean by definition a gG?

Kind Regards
Apostolos
 14 September 2017 08:26 PM
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mawry

Posts: 322
Joined: 26 April 2004

A 32M40 fuse has a continuous current rating of 32Amps but its operating characteristics are that of a 40A fuse. Means you can save a few mm on cable sizing.
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