I wanted to make some electric switches non-operational and afterward the circuit breaker will not not go on why?

Answer 1

You have created a dead short in your circuit somewhere. Since you didn't say what you did to the switches, I am guessing that instead of just connecting the switch input to its output, that you instead connected a hot wire to ground. Withe the breaker left off, open the switch box or boxes and undo what you did and leave all wires disconnected. Put wire nuts over bare wires to reduce shock hazard. Turn the breaker back on and see if it stays on. If it doesn't you probably have a nick in a wire that is touching ground after you messed around in the box. Try and reposition all wires and try breaker again.

If the breaker stays on, turn it off and reconnect your switch jumpers one at a time, turn the breaker on, and see results. Do this until you find the wiring error that causes the breaker to trip. If you have 3-way switches involved, it can often be difficult to determine where the supply voltage originates. This can be done with a volt meter, but requires some basic electrician skills and knowing how a 3-way switch functions.