We recently did a bosch unit, it was gas cook top and electric oven, 30amp 240v 4w recpt + cord. We used a 4w range recpt (50a) on a 30 amp breaker.
From the installation destructions:
Dual Fuel Models
We recommend that the range be installed with a
power cord set (not supplied with U.S. models). The 
electrical rating of the power cord set must be 120/240 volt, 
30 amperes minimum. The power cord set must be marked 
“For Use with Ranges.” Always use a new power cord
The range requires a minimum of a three-wire 120/240 or 
120/208 volt, 25 or 30 amp, 60 Hz AC circuit. Check local 
codes for proper amperage ratings. A four-wire connection 
is preferred. Most local building regulations and codes 
require that electrical wiring be done by licensed 
electricians. Be sure to install your range according to the 
electrical codes in your region.