PowerMax PMTS-30 30 Amp Automatic Transfer Switch RELAY BASED AUTOMATIC TRANSFER SWITCH RATED FOR 30 AMP POWER SYSTEMS PROVIDES SWITCHING BETWEEN TWO SEPARATE 120 VOLT AC POWER SOURCES AUTOMATICALLY SENSES THE PRESENCE OF AVAILABLE SUPPLIES OF AC POWER AND SELECTS THE PROPER ONE CAN BE USED IN RV AND MARINE INSTALLATIONS WHERE BOTH THE HOT AND NEUTRAL TERMINALS MUST BE SWITCHED TRANSFER TIME: 20 - 30 SECONDS, THIS ALLOWS THE GENERATOR TO STABILIZE BEFORE THE POWER IS DELIVERED