3RT2015–3RT2028 / 3TF44 / AC 220 V or DC 24 V coil options / 7 A–38 A / 3–18.5 kW @ 400 V
In one sentence: Siemens SIRIUS 3RT2 and SICOP 3TF magnetic contactors covering 7 A (3 kW) to 38 A (18.5 kW), with AC 220 V, AC 110 V or DC 24 V (with varistor) coils, double-break auxiliary contacts for precision circuits, S00/S0 frames for DIN rail mounting, and CCC / CE / UL / CSA compliance.
3RT2 series
| Model | AC-3 current | AC-3 power (400 V) | Coil voltage | Auxiliary contacts |
|---|---|---|---|---|
| 3RT2015-1AN21 | 7 A | 3 kW | AC 220 V (50/60 Hz) | 1NO |
| 3RT2023-1AN20 | 9 A | 4 kW | AC 220 V (50/60 Hz) | 1NO + 1NC |
| 3RT2025-1AN20 | 17 A | 7.5 kW | AC 220 V (50/60 Hz) | 1NO + 1NC |
| 3RT2027-1KB40 | 32 A | 15 kW | DC 24 V (with varistor) | 1NO + 1NC |
| 3RT2028-1AG20 | 38 A | 18.5 kW | AC 110 V (50/60 Hz) | 1NO + 1NC |
3TF series
| Model | AC-3 current | AC-3 power (400 V) | Coil voltage | Auxiliary contacts |
|---|---|---|---|---|
| 3TF44 | 32 A | 15 kW | AC 110/120 V | 2NO + 2NC |
Model selection
| Motor power / application | Recommended model | Note |
|---|---|---|
| 3 kW small motor (220 V) | 3RT2015-1AN21 | Small, S00 frame, 1NO auxiliary, saves panel space |
| 4 kW automation equipment (220 V) | 3RT2023-1AN20 | 1NO + 1NC auxiliary for PLC status feedback |
| 7.5 kW pump / fan (220 V) | 3RT2025-1AN20 | Medium S0 frame, 220 V coil |
| 15 kW frequent switching (DC 24 V PLC) | 3RT2027-1KB40 | DC coil + varistor, driven directly by PLC DO, for frequent starts and stops |
| 18.5 kW heavy duty (110 V control) | 3RT2028-1AG20 | AC 110 V coil, for panels with 110 V control circuits |
| 15 kW, compatible with older systems (3TF) | 3TF44 | SICOP series, 2NO+2NC auxiliary, standard for star-delta / DOL |
Common features of the SIRIUS series
- Double-break auxiliary contacts: switching of precision control circuits, usable down to DC 5 V low currents.
- Screw terminals: secure wire clamping, easy maintenance, CAx engineering data available.
- Direct stacking: combines mechanically with Siemens 3RV motor protection circuit breakers, saving wiring.
- Designed for frequent switching: the 3RT2027 DC 24 V version includes a varistor, for industrial applications with many starts per hour.
Trademarks: Siemens, SIRIUS, SICOP and the model names on this page are trademarks or model names of their owners, used here only to identify the products. JIAHON is not the authorized distributor of this brand in Taiwan.
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