The Schneider Electric TA16D3S1004TPE is an automatic transfer switch (ATS) from the TransferPacT series, rated 100 A continuous at 400 V AC, 3-pole, with a rotary selector control. It is built to IEC 60947-6-1, the standard for transfer switching equipment, and carries a PC (breaker-to-breaker) class rating, meaning it can switch both normal and emergency power sources without a separate isolation device. Rated for AC-33B utilization — that's mixed resistive and motor loads with occasional inrush, typical for commercial and light industrial feeder panels. The uninterrupted duty rating means it's designed for continuous current flow, not just occasional switching.
The short-time withstand (Icw) is 10 kA for 0.1 s, which tells you the switch can ride through a fault until an upstream breaker clears it. Short-circuit making capacity (Icm) hits 154 kA peak when paired with an upstream breaker — that's the peak let-through it can close into without welding contacts. Impulse withstand (Uimp) is 8 kV for the switch, 6 kV for the controller — both well above typical 400 V distribution levels, giving margin for surge events. Mechanical interlocking between sources is built in — prevents both sources closing simultaneously. The contact position indicator and padlockable OFF position give visible isolation for lockout/tagout.
The 351 mm width and 164 mm height mean it takes up a full panel width in a standard 600 mm enclosure; plan for that footprint. Connection pitch is 30 mm, and both line and load sides use screwed terminals. Front face carries IP40 in auto mode; inside the enclosure, the manual mode is IP20 — so the front is touch-safe, but the live parts behind the cover need enclosure protection. The 10,000-cycle mechanical durability is typical for a transfer switch in a backup-power application — not a daily-use contactor, but fine for weekly or monthly source-transfer tests.