Depending on the state/county where you live, that may be the case. But it should be a throw switch, not a fuse box. 240 is nothing more then two 120 circuits coming off opposite sides of the main feed from the power company. So that double breaker in your panel is just two 120 circuits. You shouldn't according to code, but you could run two different outlet circuits off that breaker. If you find two different off opposites sides of the panel 120 circuits in your home and measure the voltage between the two hot sides of those standard outlets, you would measure 240 volts.
So if you replace that fuse box, replace it with a double pole throw switch, not another fuse box. You can even buy a single 30 amp breaker panel if you really want the circuit double fused. However there is no reason to do that.
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