A 100A 4-pole automatic transfer switch (ATS) built for dual-source AC power systems running at 400V AC. It switches automatically between a solar inverter output and a grid or generator supply, so only one source ever feeds the load. Automatic and manual operation are both supported, with a switching time under 2 seconds.

Automatic transfer switch for solar inverter and grid backup

• Rating, 100A rated current, 4-pole
• Voltage, Rated voltage AC 440V, working voltage AC 220V
• Frequency, 50/60Hz
• Switching time, under 2 seconds, using zero-crossing switching for emergency disconnection of both sources at once
• Interlocking, mechanical and electrical interlock stops both sources from being connected together
• Housing, PC plastic enclosure, 244 x 118 x 145mm, rated for over 8,000 operating cycles

Operating modes

• Main power active
• Standby power active
• Both sources isolated (I-0-II)
• Emergency manual operation
• Electronic remote control
• Automatic switching with dynamic state monitoring
• Emergency disconnection

Applications

Used in solar off-grid systems to switch between inverter output and grid backup, in generator changeover for hybrid and off-grid installations, and in three-phase backup power systems for commercial and industrial dual-source AC distribution.

Built-in protection

A built-in DC switch provides short circuit, fire protection and double-break functions, alongside clear on/off position indicators and padlock provisions.

What's in the box

• 1 x 100A 4-pole automatic transfer switch

Installation notes

Fitting must be carried out by a qualified electrician. The switch must be sized correctly for the connected load and cable cross-sections, with correct fusing upstream of both inputs, following the manufacturer wiring diagram and current wiring regulations.