Siemens SIRIUS 3RT1016-2BB44-3MA0 — Power Contactor, Size S00, 24 VDC Coil
The Siemens SIRIUS 3RT1016-2BB44-3MA0 is a power contactor in the compact S00 frame size, designed for switching motor loads and resistive circuits in industrial control panels. It carries a 24 V DC coil with a pick-up threshold of 0.85 x Us and a drop-out of 1.1 x Us — meaning the coil reliably pulls in at about 20.4 V and drops out if voltage rises to 26.4 V, a characteristic that matters when sharing a DC supply with other inductive loads. Rated for 5.5 kW at 690 V AC (AC-3 duty) and 4.5 kW at 500 V, this contactor handles typical three-phase induction motors up to those power levels. The AC-4 rating of 8.5 A at 400 V covers reversing or inching applications where the contactor makes and breaks full-load current. For DC switching, the auxiliary contacts are rated 10 A at 24 V DC and derate to 0.3 A at 220 V DC — a curve that reflects the arc-extinction challenge at higher DC voltages.
Mounting and Integration — DIN Rail, Spring Terminals, Side Clearance
Mounts via screw or snap-on onto 35 mm standard mounting rail per DIN EN 50022. The 45 mm width and 60 mm height fit the S00 footprint; depth is 114 mm including the spring-loaded terminals. Side-by-side mounting is permitted with a 6 mm clearance at the side — no additional air gap required between adjacent contactors of the same size, which saves rail space in dense panels. Main circuit connections use spring-loaded terminals accepting 2x (0.25 to 2.5 mm²) solid or stranded wire, or 2x (24 to 14 AWG). The spring-cage design eliminates the need for screw-torque checks during commissioning — strip to 8 mm, insert, and the clamp holds. IP20 protection on the front and at the terminals means the contactor is finger-safe when installed in an enclosure; pollution degree 3 rating suits industrial environments with conductive dust or occasional condensation.
Coordination and Protection — Fuse Ratings, Mechanical Endurance
For type 2 coordination (no damage to the contactor under short circuit), the required upstream fuse is gL/gG 20 A. For type 1 coordination (contactor may need replacement after fault), a 35 A gL/gG fuse is specified. The mechanical endurance is rated at 30 million operating cycles — a figure that assumes the coil is properly suppressed and the load current stays within the AC-3 or AC-4 curves. Coil power consumption is 3.3 W DC for both closing and holding — the SIRIUS DC coil design does not reduce holding power after pick-up, so the coil draws continuous 3.3 W whenever energized. Ambient operating range is -25 to +60 °C; maximum installation altitude is 2 000 m without derating.