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The A-429 Series 3PST Normally Open, Double Break Contactor (also referred to as a Relay or Power Relay) is/was manufactured or cataloged by Hartman Electrical Manufacturing Division. Part numbers within this series include but may not be limited to A-429-1 and A-429W. The A-429-1 Series 3 Pole Single Throw (3PST), Double Break Contactor Normally Open (NO) electrically held Contactor. The Main Contacts arrangement is 3PST Normally Open Double Break with a Current Rating of 275 Amperes and Voltage Rating of 115/200 VAC, 400 Hz. The Auxiliary Contact(s) configuration, current rating, and voltage vary (please review CMM.) Typically, the A-429 Series Contactor can be found on Heavy Jet aircraft within the Commercial and Military sectors.