Standard Duty Combination All Standard Duty Combination units are dual voltage rated, so select your voltage and horsepower to choose the proper unit. If you should have problems, contact me at the numbers listed above. Have A Great Day! Select Proper Horsepower & Voltage Below. 10HP 230V 20HP 460V 10HP 230V 25HP 460V 15HP 230V 30HP 460V 30HP 230V 40HP 460V 25HP 230V 50HP 460V 30HP 230V 60HP 460V 40HP 230V 75HP 460V 50HP 230V 100HP 460V