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Old 04-18-2019, 01:25 PM   #1
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Default Hermetically sealed or class I div 2 fuse required

All,

Good afternoon. I'm designing a 24vdc distribution jct. box using a Hoffman type 4X, fiberglass enclosure in a class I div. 2 area. I have 20, fused terminals, 1 amp (+) and 20 terminals (-). The plant told me that I could not the Cooper 5X20 fuse because fuses do not meet the area class. Does anybody know where I can find a hermetically sealed or class I div. 2 rated fuse? I sure would appreciate it. Currently designed with Weidmuller type "WSI 4/LD 60-150V AC/DC" terminal with Weidmuller type "G 20/1.00A/F" fuse.

Thank you,
David

Last edited by notredave; 04-18-2019 at 01:46 PM.
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Old 04-18-2019, 04:08 PM   #2
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Are the terminals rated for class1 div2?
https://www.phoenixcontact.com/asset.../3465_en_A.pdf
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Old 04-18-2019, 04:30 PM   #3
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You need to find something sand filled. The plant should tell you what to buy not what not to buy.
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Old 04-18-2019, 05:02 PM   #4
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If they are installed in an enclosure rated for the area classification, you can use a regular fuse. But that will be a really expensive can.

According to the article below from Bussman, with a regular enclosure, you can use non-indicating, filled, current-limiting fuses.

From http://www.cooperindustries.com/cont...iv-2-fuses.pdf

Quote:
Fuses for the protection of motors, appliances, and lamps installed in general
purpose enclosures must also meet one of the following:
a) They are non-indicating, filled and current-limiting type. Bussmann offers
many fuses that meet the criteria for non-indicating, filled, current-limiting
type (See Note 1 and Note 2)
b) They are the type in which the element is immersed in oil or other approved
liquid. Bussmann does not offer this type of product.
c) The element is hermetically sealed against gases and vapors. Bussmann
does not offer hermetically sealed fuses for this type of
application.
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File Type: pdf bus-ele-an-3186-class-1-div-2-fuses.pdf (232.4 KB, 20 views)
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Last edited by splatz; 04-18-2019 at 05:07 PM.
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Old 04-18-2019, 08:12 PM   #5
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Quote:
Originally Posted by splatz View Post
If they are installed in an enclosure rated for the area classification, you can use a regular fuse. But that will be a really expensive can.

According to the article below from Bussman, with a regular enclosure, you can use non-indicating, filled, current-limiting fuses.

From http://www.cooperindustries.com/cont...iv-2-fuses.pdf
I gotta disagree.. Speaking from the land of the CEC, a gasketed Junction Box is approved for Zone 2. A glass filled fuse is not approved in that area.. We'd have to use sand filled or ceramic fuses..
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Old 04-18-2019, 08:15 PM   #6
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Quote:
Originally Posted by notredave View Post
All,

Good afternoon. I'm designing a 24vdc distribution jct. box using a Hoffman type 4X, fiberglass enclosure in a class I div. 2 area. I have 20, fused terminals, 1 amp (+) and 20 terminals (-). The plant told me that I could not the Cooper 5X20 fuse because fuses do not meet the area class. Does anybody know where I can find a hermetically sealed or class I div. 2 rated fuse? I sure would appreciate it. Currently designed with Weidmuller type "WSI 4/LD 60-150V AC/DC" terminal with Weidmuller type "G 20/1.00A/F" fuse.

Thank you,
David
I'd steer clear of the LED indicating ones.. They SUCK! They often let enough leakage current through mess with some electronics. I don't believe they are approved in a classified area..

As for fuses, use sand filled or ceramic. In addition to the ones that Splatz posted, here are some more..
http://www.cooperindustries.com/cont...onicfuses.html
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