The YCQ1B-63 is a dual-power automatic transfer switch (ATS) designed to switch between two AC power sources (main and standby) seamlessly. When the main power fails, it transfers to the standby source; when main power returns, it restores back automatically. It also supports manual mode, allowing users to override automatic switching when needed. The control complies with IEC 60947-6-1 standard. Rated for 10-63A, 2-pole configuration, and operates at AC 400V (with control circuits often at 220V), 50/60 Hz. Transfer time is ≤ 2 seconds. Device dimensions for the 2-pole model are approximately 150×138×115 mm.