Quote Originally Posted by Clive S View Post
What that means is that the switch can supply 300mA try putting a mA meter in circuit and see what you get.
Not quite, it means the sensors can switch 300mA. It's not supplying anything.
.
Most of these sensors have overload protection built in, so if you were to try and switch a load that exceeds 300mA, it would appear to do nothing. However, a BOB opto will not need anywhere near that much current.