Siemens 3RT20262FB40 Power Contactor
The 3RT20262FB40 is a DIN-rail or chassis-mountable contactor commonly installed in motor feeder circuits, industrial control cabinets, and automation panels requiring reliable DC coil switching. The S0 frame supports snap-mounting to standard 35 mm DIN rails without additional hardware.
3RT20262FB40 vs. Series-10 Alternatives
The following comparison is based on recorded specifications; users must qualify each part for specific application requirements.
| Spec | 3RT20262FB40 (seed) | 3RT20262FB443MA0 | 3RT20262KB40 | 3RT20262DB40 | 3RT20262BB40 |
|---|---|---|---|---|---|
| Coil Voltage | 24 VDC | 24 VDC | 24 VDC | 24 VDC | 24 VDC |
| Contact Rating | 25 A | 25 A | 25 A | 25 A | 25 A |
| Coil Power | 5.9 W | 5.9 W | 4.5 W | 5.9 W | 5.9 W |
| Must Operate Voltage | 19.2 VDC | 19.2 VDC | 16.8 VDC | 19.2 VDC | 19.2 VDC |
| Contact Arrangement | 1NO/1NC | 2NO/2NC | 1NO/1NC | 1NO/1NC | 1NO/1NC |
| Mounting | Chassis, DIN Rail | Chassis, DIN Rail | Chassis, DIN Rail | Chassis, DIN Rail | Chassis, DIN Rail |
| Similarity | — | 1.0 | 1.0 | 1.0 | 1.0 |
- 3RT20262FB443MA0: Same coil, same operate voltage, same power draw; differs in auxiliary contact count (2NO/2NC vs 1NO/1NC) and box encapsulation. Suitable where additional auxiliary signaling is required.
- 3RT20262KB40: Shares 24 VDC coil and 25 A rating; lower coil power (4.5 W) and higher must-operate voltage (16.8 VDC) reflect different coil design; operate time 270 ms vs 170 ms.
- 3RT20262DB40: Matches seed on coil voltage, power, must-operate voltage, and contact rating; same 1NO/1NC arrangement with box encapsulation.
- 3RT20262BB40: Near-identical specification to the seed with matching coil resistance (97.6 Ω), current (245.8 mA), and bulk packaging.
Coil and Contact Specifications
- Coil voltage: 24 VDC; coil resistance 97.6 Ω; inrush current 245.8 mA
- Must operate voltage: 19.2 VDC (80% of nominal coil voltage)
- Contact form: 3PST-NO (three normally-open power poles) with integral 1NO/1NC auxiliary
- Current rating: 25 A per pole at rated ambient
- Base product number: 3RT2026 — shared across the entire S0 25 A frame series