Switch current rating label: 0.1GPA
To really know, you'd have to have a few hundred dollars to get access to the CUL 61058-1 document. However, it probably stands for General Purpose Amps GPA. The rating is the same as a regular amp, they probably redefine it to differentiate between DC amps and AC amps or to mean both. 


Source: http://www.state-elec.com/honeywell/pdf/MICRO-SWITCH%20V15.pdf