Integrator's Quick Take
The Siemens 3RT1016-2HB42 is a SIRIUS power contactor in size S00, meaning it's the compact frame for light-to-medium motor and resistive loads up to 5.5 kW at 690 V. The 24 VDC coil draws 2.3 W both on closing and holding, so your control transformer or DC supply needs to sustain that continuously, not just a pickup surge. Spring-loaded terminals on the main circuit accept 2x (0.25 to 2.5 mm²) solid or stranded, or 2x (24 to 14 AWG). No screw torque to verify — just strip to 8 mm and push. The auxiliary contact block is separate; this order code ships with zero instantaneous auxiliary contacts, so factor in a 3RH2911 or similar if you need feedback.
What the Ratings Mean for Your Panel
The headline motor ratings are 4.5 kW at 500 V and 5.5 kW at 690 V in AC-3 duty — that's the standard induction motor switching category. For more demanding loads like reversing or inching (AC-4), the same contactor is rated 8.5 A at 400 V, so it handles frequent plugging or jogging within that current envelope. AC-1 resistive load rating hits 10 A at 230 V and 6 A at 400 V, covering heater banks or lighting contactor duty. The AC-2 rating of 4 kW at 400 V applies to slip-ring motor starting. For DC switching, the coil-side auxiliary contacts are rated 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V — these are the make/break limits for pilot duty. Pollution degree 3 means the contactor is rated for industrial environments where conductive pollution or dry non-conductive pollution with occasional condensation occurs — standard for an unsealed panel. IP20 on the front and terminals means finger-safe but not washdown; keep it inside an enclosure rated for the environment.
Mounting and Integration
Mounts via screw or snap-on onto 35 mm DIN rail per EN 50022. The 45 mm width and 60 mm height fit standard S00 contactor spacing. Side-by-side mounting is allowed with 6 mm clearance to adjacent devices — no derating needed for the 30 million mechanical cycle life. Depth is 73 mm, which is shallow enough for most 200 mm deep enclosures with room for wiring ducts. The spring-loaded terminals reduce wiring time versus screw types, especially on repetitive builds.
Coordination and Protection
For type 2 coordination (no damage to the contactor on a short circuit), Siemens specifies a gL/gG fuse of 20 A. For type 1 coordination (contactor may need replacement after fault), a 35 A fuse is allowed. This matters when you're designing to IEC 60947-4-1 and need to publish SCCR values for the panel label. Operating temperature range is -25 to +60 °C, with a maximum operating altitude of 2,000 m. The coil's pick-up and hold power is flat at 2.3 W DC, so no thermal derating curve to worry about across the full temperature span for the coil itself.