Dual-Power Automatic Transfer Switch

General

The STDS2 series automatic transfer switch is mainly used for AC 50Hz, rated voltage 400V, and rated current from 16A to 3200A power supply load switching.

Features

◆ Utilizes dual-row composite contacts to achieve near-zero arc (no arc suppression cover);
◆ Features reliable mechanical and electrical interlocking for safe and reliable operation;
◆ Employs zero-crossing technology, allowing forced zero-position activation (simultaneously cutting off both power supplies) in emergencies;
◆ High safety performance, high automation level, high reliability, with a service life of over 8,000 operations.

General

◆ The STDS3 series product is a PC-class dual power supply automatic transfer switch, mainly used in two-way neutral-point grounded power supply systems with AC 50/60Hz, rated voltage 400V and below, and rated operating current up to 630A.

Features

◆ High short-circuit withstand capability and high short-circuit make capability, with high-density silver alloy contacts;
◆ Optimized magnetic blowout arc extinguishing system;
◆ Features three working positions: "normal position," "open position," and "standby position";
◆ Rich functions and diverse forms. The controller has under-voltage, over-voltage, phase loss automatic switching functions, and electric forced switching functions. The automatic mode integrates two modes: self-restore and self-restore not automatically.

General

◆ The STQ3 series dual-power automatic transfer switch offers three switching functions: self-restore (auto-restart), self-transfer without self-restart, and grid-generator. It simultaneously monitors the three-phase voltages of two power supplies in a three-phase four-wire power grid. When any phase experiences overvoltage, undervoltage, or phase loss, it automatically switches to the normal power supply. For grid-generator systems, it can also issue a generator start command. This series is characterized by comprehensive performance, safe and reliable operation, high automation level, and wide application range.
◆ The STQ3 series includes four standardized products: STQ3, STQ3NX, STQ3CM, and STQ3NM.

Standard

◆ This series of dual-power automatic transfer switches complies with GB/T 14048.11 and IEC 60947-6-1 standards.