These requirements cover low-voltage ac power circuit breakers as follows: a) Stationary-mounted or draw out-mounted types, b) 2-pole, 3-pole, and 4-pole constructions, c) Manually operated or power operated, and) With or without electromechanical or solid-state type trip device. Revised 1.1 effective April 13, 2017.

• Year of Declaration: 2018
• Reference: UL 1066: 2017
• Number of Pages: 102
• Code: GYS 538
• Version: Fourth Edition April 13, 2012
• ICS Number: 29.130.10. - 29.130.20