It looks like you're getting lulled into the "certified for hazardous areas" myth. You don't need fuses identified for Division 2. Here's the code background on using fuses in Class 1, Division 2 locations. I'm assuming you already know the area is Class 1, Division 2, Group B/C/D, and some temperature code (assuming T3). Referencing 2011 NEC:
Section 500.8 (A) - Suitability. Suitability of identified equipment shall be determined by one of the following:
(1) Equipment listing or labeling
(2) Evidence of equipment evaluation from a qualified testing laboratory or inspection agency concerned with product evaluation
(3) Evidence acceptable to the authority having jurisdiction such as a manufacturer's self-evaluation or an owner's engineering judgement
It looks like you're trying to use option (1), which is the most black and white but also the most restrictive. It costs manufacturer's a lot of money to have UL, ETL, CSA, FM, or another lab test their product. In most cases by the very nature of the product it is self-eveident that it will be suitable for Class 1 Div 2 - that's where 500.8(A)(3) comes in.
Assuming you are a consultant and the owner isn't willing to make any judgements, we'll proceed with listed or labeled equipment only that meets the code without any interpretation.
Article 501, Section III - Equipment
501.105 - Meters Instrumentation and Relays
501.105(B)(5) Fuses. Where general purpose enclosures are permitted in 501.105(B)(1) through (B)(4), fuses for overcurrent protection of instrument circuits not subject to overloading in normal use shall be permitted to be mounted in general purpose enclosures if each such fuse is preceded with a switch complying with 501.105(B)(1)
This section right here should dispell any need for Class 1 Division 2 fuse blocks or fuses, because it's fairly cheap and easy to comply with 501.105(B)(1):
501.105(B)(1) Contacts. Switches, circuit breakers, and make-and-break contacts of pushbuttons, relays, alarm bells, and horns shall have enclosures identified for Class 1, Division 1 locations in accordance with 501.105(A).
Exception: General purpose enclosures shall be permitted if current-interrupting contacts comply with one of the following:
(1) Are immersed in oil
(2) Are enclosed within a chamber that is hermetically sealed against the entrance of gases or vapors
(3) Are nonincendive circuits
(4) Are listed for Division 2
This gives you a few options, we use each of these options depending on the particular application:
1. Mount an "explosionproof light switch" for the main incoming power next to the NEMA 4X instrument enclosure. We use this approach for our wireless tank gauging system tankside monitors. The box contains a wireless radio, an interface between the radio and 4-20 mA loops, and a 120VAC to 24 VDC Class 1 Div 2 power supply. There are five fuses in the box in Shawmut USCC1I holders - a 120V main fuse, a 24VDC main fuse, 24VDC branch fuse for the radio, and two 24VDC branch fuses for the two loops. This approach works because any time we need to change one fuse, it doesn't hurt anything to kill the power to the whole box. The other time this works is even if we can't kill the main power and need to change a fuse, we can take a gas test and write a hot work permit which allows us to do spark-producing opeartions like opening a switch, drilling a hole in the box, grinding, welding etc. The "explosionproof light switch" is a Crouse-Hinds EDSC2129 - go to
www.crouse-hinds.com and type the part number in the search box.
2. If you can't kill the main power to the box and need multiple individual disconnecting switches, you could use 30 MM 2 position control switches with sealed contact blocks. We use Allen Bradley 800H-HR2AP switches in this application. These switches are NEMA 4X rated themselves and can be mounted in NEMA 4X boxes in Division 2 areas using 501.105(B)(1) Exception 2. I think these blocks also carry a Division 2 listing so they meet 501.105(B)(1) Exception 4 as well.
All of this being said, for the Weidmuller fuse block to be actually useful it would have to have a disconnecting means ahead of the fuse that is compliant with 501.105(B)(1). This fuse block looks just like an other instrument fuse block from Weidmuller, Phoenix Contact, Allen Bradley, etc. so I doubt it has a disconnecting means suitable for Division 2. This means some disconnecting means compliant with 501.105(B)(1) is still required upstream of the so-called Class 1 Division 2 fuse block. This is what I mean by the "certified for hazardous areas" myth - the product is listed or labeled for Class 1 Dvision 2, but you have to take the same measures to make it usable as you would with any non-listed block. It's a marketing technique only - save your money and increase your options - buy any instrument fuse block you want, put in a local sealed disconnect switch on the main incoming power to the box, and put a sign on the box indicating that the fuse block is only to be operated with the power off or with a hot work permit.
