AC DataSheet

General guidelines
To insulate your solderjoints or connectors you should try to use the shrinktube that has the tightest fit. As a general rule you best take the shrinktube that is one size bigger than you connector or wire. E.g: to insulate a 4mm connector it is best to use the 5mm shrinktube
what shrinktube for what connector?
Connector	Shrinktube	Amp rating
MP Jet 1.8mm	AC-POLYTUBE3-30 OR AC-POLYTUBE2-30
AC-CONN-2	AC-POLYTUBE3-30 OR AC-POLYTUBE2-30	20 A
AC-CONN-2A	AC-POLYTUBE3-30 OR AC-POLYTUBE2-30	20 A
AC-CONN24-F/M	AC-POLYTUBE3-30 OR AC-POLYTUBE2-30	15 A
AC-CONN35-F/M	AC-POLYTUBE3-40, AC-POLYTUBE3-50 or AC-POLYTUBE2-50

AC-CONN-4	AC-POLYTUBE3-50 OR AC-POLYTUBE2-50	55 A
AC-CONN-4A	AC-POLYTUBE3-50 OR AC-POLYTUBE2-50	55 A
4042 ROBBE M4	AC-POLYTUBE3-50 OR AC-POLYTUBE2-50	40 A +

Insulating AC-CDMOT-SET01	AC-POLYTUBE3-10

Here is the conversion table for Standard Wire Gauge wire sizes.