The MAXimum Output (source)
from any Picaxe pin is 20mA.
The MAXimum Input (sink)
into any Picaxe pin is 20mA.
And this is at the Picaxe supply voltage level ONLY, usually 3.5V to 5V
E.g. you can't Input (sink) 5V if only using 3.5V as the Picaxe supply voltage.
Any load greater than 20mA and/or above the Picaxe supply voltage 3.5V to 5V should
be driven via a Transistor, MOSFET or Relay-(which will also require a transistor to drive
it).
SSRs (Solid State Relays) have an IR LED driving their input side, which can be driven
directly from any Picaxe output for AC switching. ( for advanced users only
)