The Siemens 3RT1326-1AL20 is a SIRIUS power contactor in the S0 frame size, rated 11 kW at 400 V in AC-2 duty — that's the current it can switch for slip-ring motor loads, not the resistive-heater rating. Four normally-open main contacts give you a single-pole make per phase plus a spare, which matters if you're switching a three-phase motor and need an independent NO leg for a holding circuit or auxiliary load. The 50/60 Hz coil tolerance (0.8...1.1 at 50 Hz, 0.85...1.1 at 60 Hz) means it holds in across typical line fluctuations without a separate voltage regulator. Side-by-side mounting is permitted, but the 6 mm side clearance to adjacent devices is the minimum for heat dissipation; pack them tighter and you'll need to derate.
If your panel spec calls for Type 2, the 35 A fuse is the hard limit — don't oversize it or you lose the coordination. The main circuit terminals accept up to 10 mm² stranded, which is good for the 11 kW motor circuit without a separate terminal block.
The built-in auxiliary contacts (4 NO) are rated 10 A at 24 V, dropping to 0.3 A at 220 V. That's typical for control circuits — the 24 V rating handles a PLC output or relay coil directly; the 220 V rating is enough for a pilot light or contactor coil but not a motor starter. Mechanical endurance is 10 million cycles, so it'll outlast most panel rebuilds.