What this contactor is and what the ratings mean
The Siemens 3RT1016-1BM45-ZW96 is a 3-pole contactor in the SIRIUS series, size S00, with a DC 220 V coil and a front-mounted auxiliary switch block carrying 3 normally-open and 2 normally-closed contacts. Its AC-3 rating of 4 kW at 400 V means it is sized for switching three-phase induction motors up to that power under full-load starting conditions — the duty cycle that governs contact life in conveyor, pump, and fan applications. The screw terminals accept standard ferrule or solid conductors for panel wiring.
Deployment context
Size S00 snap-mounts directly onto a 35 mm DIN rail inside a control panel. The DC 220 V coil allows direct connection to a DC bus or rectified supply without an AC-to-DC interface module — a common requirement in installations where the control voltage is derived from a battery-backed DC system.