Help with identifying aircraft part 5D/1392 please

[Foundbits]

In sorting through a box of connectors I found an item marked 5D/1392. The inside appears to be a fuse and there's two screw terminals that might take wires threaded through a small hole at the rear.The top has a flip cover (possibly incomplete?) with two sockets approx 13mm apart. The item is approx 53mm long.
I've had a look around the net and I can't find any reference to this item number except that it may be something to do with aircraft armament electrical
Any ideas as to what this might be would be appreciated.

 

[Crimea_River]

That's about as far as I get with my reference material as well. The marking follows the British Stores Reference Number system defined in Air Publication AP 1086. Group 5D refers to "Aircraft Armament Electrical Stores".

 

[Foundbits]

Thanks for looking for me. I did wonder if it might be something that the bomb release switch 5D/596 might plug into. The spacing on the pins at 0.5 inch looks right. I am way out of my depth!