Why do you want / need a fuse? If this is used in a combustible gas environment, could a blown fuse cause a spark with any inductive wire or load?. Why would you want even to use this module?
By the way, your 2 attachments are the same
It just seems to be a 12V Zener with a series R for input and output and a whole bunch of specs in a fancy box,
Explosion Protection
Application range (Zones)
2
Ex interface zone
0
1
2
20
21
22
IECEx certificate Gas
IECEx PTB 09.0001X
IECEx gas explosion protection
Ex nA [ia Ga] IIC/IIB T4 Gc
IECEx dust certificate
IECEx PTB 09.0001X
IECEx dust explosion protection
[Ex ia Da] IIIC
ATEX gas certificate
PTB 01 ATEX 2088 X
ATEX gas explosion protection
E II 3 (1) G Ex nA [ia Ga] IIC/IIB T4 Gc
ATEX dust certificate
PTB 01 ATEX 2088 X
ATEX dust explosion protection
E II (1) D [Ex ia Da] IIIC
Certificate FMus
3011002
Marking FMus
NONINCENDIVE FOR, Class I, Div. 2, Groups A,B,C,D; T4,
Class I, Zone 2, Group IIC T4
IS connections for Class I,II,III, Div. 1, Groups A,B,C,D,E,F,G;
Class I, Zone 0, Groups IIC/IIB
Hazardous location when inst. per doc. 90 016 11 31 1
Certificate ULus
E81680V1S3
Marking ULus
For use in Hazardous location, Class I, Div. 2, Groups A,B,C,D; T4
Providing IS circuits for Class I,II,III, GROUPS A,B,C,D,E,F,G;
per doc. 90 016 11 31 3
Certificate cCSA
1284547