Siemens 3RT20261AL20 S0 Contactor
3RT20261AL20 family position
The 3RT2026 prefix places this in Siemens' S0 frame series (Size S0, 45 mm width); the “1AL2” mid-code signals 230 V AC coil with 1NO/1NC auxiliary contact arrangement. Siemens uses that position-digit to denote coil voltage; panel builders matching 230 V AC systems use it to filter the series without reviewing every datasheet.
| Spec | Value |
|---|---|
| Contact rating | 25 A |
| Coil voltage | 230 VAC |
| Contact form | 3PST-NO (3 Form A) main poles |
| Auxiliary | 1NO + 1NC |
| Mounting | Chassis / DIN Rail |
| Operate time | 40 ms |
| Must-operate voltage | 195.5 VAC |
| Operating temp | 25°C ~ 60°C |
| Coil power | 81 VA inrush |
Bulk packaging and auxiliary contacts are listed; DIN rail compatibility is standard for the S0 frame.
Alternate coil voltages (same S0 frame, different position code)
The seed carries 230 V AC coil. Siemens ships the same main-pole contact set with other AC coil voltages under different position codes in the same family; similarity is anchored on identical current rating, mounting, and main contact form.
| MPN | Coil | Auxiliary | Package |
|---|---|---|---|
| 3RT20261AL20 | 230 VAC | 1NO/1NC | Bulk |
| 3RT20261AL24 | 230 VAC | 2NO/2NC | Box |
| 3RT20261AG20 | 110 VAC | 1NO/1NC | Bulk |
| 3RT20261AM20 | 208 VAC | 1NO/1NC | Box |
| 3RT20261AU20 | 240 VAC | 1NO/1NC | Box |
- 3RT20261AL24 matches coil voltage and current; differs only in auxiliary count (2NO/2NC) and package style.
- 3RT20261AG20 matches auxiliary arrangement and current; differs in coil voltage (110 VAC, must-operate 93.5 VAC).
- 3RT20261AM20 shares 1NO/1NC and current; 208 V AC coil (must-operate 176.8 VAC) sits near the 230 V band.
Lower-AC-voltage variants (24 V, 42 V, 48 V) exist in the alternates; they share the main pole spec but differ substantially in must-operate voltage.
Engineering verification checklist
- Confirm system nominal voltage matches 230 VAC coil rating before installation
- Verify must-operate voltage (195.5 VAC) clears under minimum expected supply conditions
- Check that the 1NO/1NC auxiliary arrangement matches control-circuit logic requirements
- Confirm DIN rail or chassis mounting dimension compatibility with existing enclosure layout
- Validate coil inrush power draw (81 VA) against supply transformer or control-power rating
- Confirm operate time (40 ms) suits timing-critical interlock or sequencing needs
- Verify ambient temperature range (25°C ~ 60°C) covers worst-case cabinet environment
- Compare selected auxiliary quantity (1NO/1NC) against project auxiliary requirement; consider 2NO/2NC variant if expansion is required