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It is doubtful the fuse is an issue, check the refrigerant charge in the AC system, if it is low the compressor will not engage. You can jump the low pressure switch to turn on the compressor, that will verify the electrics are all ok. The switch is located in the low pressure AC line from the compressor on the engine, it is the larger of the 2 lines coming from the AC compressor.
first thing check AC compressor fuse.the AC compressor clutch should engage when you turn on airconditioner if AC compressor dont come on and fuse okay compressor clutch is open or low on refrigerant you need check your AC refrigerant low pressure side and high pressure side need a manifold gauge set. best let garage check out AC system could need system recharged or could have leak in the system.
The low pressure port on an AC system is between the evaporator and the compressor. The evaporator is the cooling coil in the dash. I believe you will find an accumulator just on the "out" side of the evaporator. The accumulator is a round aluminum container about 4 in. in diameter and about 7 in tall. It has a tube from the evaporator going in near the top, a tube/hose going from the accum. to the compressor and probably a pressure switch and a charging port. All these items are located around the top of the accumulator. That charging port is the low pressure, (suction side of the compressor). Don't over charge. Use just enough to get cold air from the system. I doubt this system has a sight glass in the tube near the condensor, but if it does, put in just enough refrigerant to where you no longer see bubles going past the sight glass. If this is a cronic leak, you must have the leak repaired. It is aginst the law to recharge AC systems without repairing the leak.
Generically speaking, if the compressor is really running and there is no pressure difference, the compressor is not pumping it has gone bad. BUT, since you say it is not cycling off and on, I believe the compressor is not running but you are seeing the pulley turning only. Also if the pressure is 25 psi, it is too low as in the amount of refrigerant is low. Check the pressure switch to see if it is open or closed electrically. Not sure what the 30 amp fuse powers since you say it worked before. Start here.
preform and electrical check of the necessary componets, check AC fuse for blown fuse, check fan switch and fuses for power, if you have ac guages check ac refrigerant pressures, you have a pressure cycling switch that if low pressure exits in the system will not alllow the ac compressor to activate and circulate the refrigerant... it is a common practice to bypass that to install refrigerant, but you may have a leak so if you suspect a leak then add leak detector and refrigerant at the same time , look for any leaks and repair as needed... if you are unsure then have a qualified ac tech preform thses repairs...