What This Part Is and Where It Fits
The Siemens 3RT1026-1BB46-1AA0 is a SIRIUS power contactor in size S0, designed for switching motor loads and resistive loads in industrial control panels. Its 24 VDC coil draws 5.4 W during both closing and holding, so the coil-supply circuit must be sized for continuous 5.4 W dissipation — no inrush spike to worry about, but the heat adds up in a dense panel. Rated 10 A in AC-12 duty (resistive loads at 24 V), it handles the control-circuit switching common in PLC output isolation and small heater banks. For motor duty, the AC-4 rating at 400 V is 15.5 A — that's the wear-and-tear figure for reversing or plugging applications where the contactor makes and breaks full locked-rotor current. The AC-2 rating at 400 V is 11 kW, covering slip-ring motor starting.
Mounting and Integration
Mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 50022. The 65 mm width and 85 mm height leave room for auxiliary contact blocks alongside. Side-by-side mounting is permitted, so you can gang multiple contactors without spacing — useful for compact motor control centers. Main and auxiliary/control circuits use screw-type terminals. Main terminals accept solid wire 2x (0.5–1.5 mm²), 2x (0.75–2.5 mm²), or max 2x (0.75–4 mm²); stranded accepts 2x (1–2.5 mm²), 2x (2.5–6 mm²), or max 2x 10 mm². AWG equivalents are 2x (16–12), 2x (14–10), 1x 8 for main contacts. The IP20 front enclosure keeps fingers out during operation; the terminal area is IP00, so live parts are exposed — wireway covers or shrouding is expected in the panel.
Coordination and Protection
For Type 2 coordination (no damage to the contactor after a short circuit), a gL/gG fuse rated 35 A is required. Type 1 coordination (contactor may need replacement after fault) allows a 100 A gL/gG fuse. The pollution degree 3 rating means it's suited for industrial environments with conductive pollution — typical for factory floors without climate control. Operating temperature range is -25 to +60 °C, covering most indoor industrial installations. The mechanical life is 10 million operations typical, so in a cycling application at one operation per second, that's about 115 days of continuous duty — plan spares accordingly for high-cycle lines.
Lifecycle and Sourcing Reality
RoHS compliance date is 2006-07-01, meaning it meets the original EU RoHS directive. No REACH or UL listing is explicitly stated in the spec record, but as a Siemens industrial control product it typically carries CE marking and UL recognition — verify the specific UL file number against your panel's listing requirements.