Switching main circuit at 30 amp load This topic contains 2 replies, has 2 voices, and was last updated by John C 1 year, 4 months ago. Author Posts February 14, 2017 at 12:24 pm #8422 Thurman MetcalfParticipant I need to switch on a new circuit at 30 AMP load on main circuit. How this can be done? February 14, 2017 at 12:25 pm #8423 Thurman MetcalfParticipant Can you share details. I need circuit should be activated only when load reaches at 30 amp in main circuit February 14, 2017 at 12:28 pm #8424 John CGalco Representative Ok Thurman I found a current sensing relay adjustable 5 to 50amps you can setup easily. Follow this link SSAC relay to check it out. You can order online or call us at 800-575-5562 and our sales staff will be happy to help you with this. Author Posts You must be logged in to reply to this topic.