SIRIUS S00 power contactor — 24 V DC coil, varistor suppression
The Siemens 3RT1016-1DB42-ZX95 is a SIRIUS S00-frame power contactor with a 24 V DC magnet coil drawing 3.3 W closing and holding, fitted with an integrated varistor surge suppressor. It switches motor loads in AC-3 duty up to 5.5 kW at 690 V and 4.5 kW at 500 V, and handles AC-4 reversing or plugging service at 8.5 A at 400 V. The screw-type main circuit terminals accept 2x (0.5…1.5 mm²), 2x (0.75…2.5 mm²), or max. 2x (0.75…4 mm²) solid/stranded conductors. The 45 x 57.5 x 111 mm footprint and 6 mm side clearance allow side-by-side stacking without derating.
Duty ratings and coordination
The AC-3 rating (4.5 kW at 500 V, 5.5 kW at 690 V) governs standard squirrel-cage motor switching. For resistive loads (AC-1), the maximum operating current is 10 A. With type 2 coordination, a 20 A gL/gG fuse protects the contactor; type 1 coordination allows a 35 A fuse. The auxiliary contact block (1 N/O + 1 N/C, instantaneous) switches 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V, 6 A at 230 V, and 3 A at 400 V.
The S00 frame and screw-terminal wiring match the standard panel layout for 3RT1 contactors; the 24 V DC coil with varistor is a common variant for PLC-driven panels where coil suppression is required.