IEC 60947-4-1:2018 specifies requirements for electromechanical contactors, motor starters, and related devices used in circuits up to 1,000 V AC or 1,500 V DC. This fourth edition updates and replaces the previous edition from 2009 and its 2012 amendment. Key changes include revised scope and exclusions, updated safety aspects, new requirements for motor protective switching devices (MPSDs), and alignment with other IEC standards. Significant updates also include provisions for electronic circuits, high-efficiency motor applications, dedicated wiring accessories, and new annexes covering aspects like photovoltaic applications, load monitoring, and short-circuit testing.