switch trips breaker when turned on if bulb is in
The bulb is either overloading the circuit (if the circuit is that close to overload, you have big problems), or creating a short-circuit.  I'd say it's more likely that the light fixture is wired incorrectly, or there's a short-circuit in the 'bulb' itself (more likely if it's a CFL, or LED).

Try a different 'bulb', and inspect the fixture wiring.