TransferPacT TA10D3S0404TPE — 40 A automatic transfer switch for source-changeover duty
It is classified as a PC-class transfer switch per IEC 60947-6-1, meaning it is a switching device that transfers the load between two sources but does not provide overcurrent protection — that is handled upstream by a circuit breaker or fuses. The utilization category AC-33B confirms it is suited for mixed resistive and motor loads, including motors up to 15 A inrush, plus tungsten and discharge lighting loads.
The short-time withstand current (Icw) is 5 kA for 0.1 s, which governs coordination with the upstream protective device: the switch must see the fault cleared within that window. Short-circuit making capacity (Icm) is 15 kA for the switch-disconnector alone at 400 V AC, rising to 75 kA with an upstream protection circuit breaker — the breaker must be selected to limit the let-through energy to what the switch can survive. Mechanical interlocking between the normal and emergency-source contacts is built in, preventing both sources from closing simultaneously. The switch offers three contact positions: ON (source 1), OFF, and ON (source 2). Signal contacts are configurable as 1 NO + 2 NC, 1 NC + 2 NO, or 2 NO — the buyer should confirm the factory configuration for their order. Mounting is by plate or DIN rail; connection pitch is 18 mm. Mechanical durability is 8000 cycles — for a transfer switch that typically operates only during a source failure or test, this is a long service life.