I contacted AltSmoke about the limit of the switch in the SB, this is what they replied with,
I know some people were wondering about this information and I haven't seen it anywhere so I figured that I would post it. My first SB arrives in 2 days I can't wait.
John, The switch is rated 2A@48VDC, which will get you 96 watts. The spring in the SB will fail at 7.5 Amps. I would say keep it under 6 Amps Chad
With best regards,
Silver Bullet/BB Issues