What it is and where it fits
The Siemens 3RT1016-2JC42-ZX95 is a SIRIUS power contactor in the S00 frame size, designed for switching motor loads in control panels. It mounts via screw or snap-on onto a 35 mm DIN rail per DIN EN 50022, so it drops into a standard panel layout without adapters. The main current circuit uses spring-loaded terminals, accepting 2x (0.25 to 2.5 mm²) solid or stranded conductors — no screw torque to verify, which saves time on the wireman's side.
Key ratings and what they mean for fit
Rated at 10 A at 24 V DC coil — that's the holding current for the magnet coil, not the main contact rating. The coil closing and holding power are both 2.3 W DC, so the control transformer or DC supply needs to budget that draw continuously. For motor duty: AC-2 at 400 V is rated 4 kW, and AC-4 at 400 V is 8.5 A. AC-2 covers slip-ring motors; AC-4 covers plugging and inching. If your application is standard squirrel-cage starting (AC-3), the 3RT1016-2AP02 sibling is the one to cross-check — this unit's AC-4 figure tells you it handles reversing or jogging duty at that current. The auxiliary contact ratings: 10 A at 230 V (AC-12 resistive), 6 A at 230 V, 3 A at 400 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V. That covers most signal-level switching in a 24 VDC or 230 VAC control circuit. Type 1 coordination requires a 35 A gL/gG fuse; Type 2 coordination needs a 20 A gL/gG fuse. If you're building to a specific SCCR target, the fuse choice drives the let-through energy — Type 2 is tighter on fault current. Pollution degree 3 means it's rated for industrial environments where conductive pollution can occur — no conformal coating needed for most panel conditions. Operating temperature is -25 to +60 °C, and it's good up to 2 000 m altitude without derating. Mechanical service life is 30 million operations typical — that's the coil and armature, not the contacts. For high-cycle applications like conveyor diverters, that's a solid baseline.
Lifecycle and sourcing reality
The surge suppressor is built in with a diode (designed for DC coils), so there's no separate suppressor module to order and no free-wheeling diode to add externally. That's one less line item on the BOM. Front protection is IP20 — finger-safe from the front, but not sealed. It's a panel-mount part, so it expects enclosure protection; no washdown rating here.
Dimensions and panel fit
Width 45 mm, height 60 mm, depth 73 mm. That's the S00 footprint — it's the smallest frame in the SIRIUS contactor family. Side-by-side mounting is allowed, with 6 mm spacing to the side for heat dissipation. If you're replacing a 3RT1016-2AP02, the footprint is identical; the difference is the coil voltage and termination type.