Reference GVAN20 is not one to on replacement to GK2AX20 , But it is the best solution we can suggest .
In fact, the GK2AX20 is compatible to use with GK3EF80 Breaker and it can not be used with GV3 or GV2 breakers.
Also the GVAN20 is compatible to use with GV2 and GV3 breakers and it can not be used with GK3EF80 Breaker.
GK2AX20 is auxillary contact for GK3EF80 breaker and both are obsolete now.
Hence you have to replace both breaker and auxillary contact togather. If you replace the GK3EF80 breaker by GV2 or GV3 series breaker, you can use the acuxillary contact GVAN20.
The auxillary contact should be selected according to the selected breaker compatibility. You may refer the attached GK3, GV3, GV2 product assembly diagram for the compatible accessories
Please check our complete catalog through that link :