Schneider electric tesys overload relays for use with lc1da7 contactors schneider electric lrd350 a 37 to 50a differential thermal overload relay from the tesys lrd series that is designed for use with the lc1da7 range of contactors the relay is controlled via start and stop push buttons designed for motor protection applications schneider electric lrd350 tesys 37 50a overload relay for contactors lc1da7 o