Siemens 3RT20161AN21 S00 Contactor
The 3RT20161AN21 is a DIN-rail or chassis-mount AC contactor from Siemens' SIRIUS S00 series. Three normally-open power poles rated 9 A at 220 VAC drive loads directly; an integral auxiliary contact block is standard. Panel builders use these in motor-branch and lighting-control circuits where a verified 220 V AC coil is specified.
Ratings summary
| Spec | Value |
|---|---|
| Coil voltage | 220 VAC |
| Must-operate voltage | 187 VAC |
| Contact rating (AC-3) | 9 A |
| Power poles | 3PST-NO (3 Form A) |
| Coil power (inrush) | 24.3 VA |
| Operate time | 35 ms |
| Mounting | Chassis mount or 35 mm DIN rail |
| Operating temperature | 25 °C to 60 °C |
| Encapsulation | Box |
The coil draws roughly 0.11 A at 220 V; inrush impedance limits drop-out once the pole closes. Operating temperature range reflects closed-box thermal rise under continuous load—not an open-environment spec.
S00 frame, auxiliary contacts, and coil selection
The S00 frame accepts only side-mounted auxiliary contact blocks; top-mount blocks require the larger S0 or S2 frames. The 1NO auxiliary contact is wired at the factory; field conversion to 1NC is not supported without replacing the device.
Coil voltage variants (all share the 3RT2016 base number):
| MPN | Coil | Auxiliary | Encapsulation |
|---|---|---|---|
| 3RT20161AN21 | 220 VAC | 1NO | Box |
| 3RT20161AN22 | 220 VAC | 1NC | Box |
| 3RT20161AM21 | 208 VAC | 1NO | Box |
| 3RT20161AN61 | 200 VAC | 1NO | Bulk |
| 3RT20161AN62 | 200 VAC | 1NC | Bulk |
| 3RT20161AK21 | 120 VAC | 1NO | Box |
| 3RT20161AK61 | 120 VAC | 1NO | Bulk |
| 3RT20161AB01 | 24 VAC | 1NO | Bulk |
| 3RT20161AV61 | 480 VAC | 1NO | Box |
Must-operate voltage scales with coil rating: 170 VAC for 200 V units, 176.8 VAC for 208 V, 187 VAC for 220 V, 102 VAC for 120 V, 96 VAC for 120 V (bulk), and 20.4 VAC for 24 V. The 480 V coil variant (3RT20161AV61) is rated for 7 A continuous load rather than 9 A at that voltage class.
Comparison with alternate coil voltages
The 3RT20161AN21 and its alternates share the same S00 frame, contact arrangement, mounting, and operate time. The primary difference is coil voltage and must-operate voltage. For applications where 220 V AC control power is the standard, the 3RT20161AN21 (1NO) and 3RT20161AN22 (1NC) are direct substitutes—verify the auxiliary contact sense before ordering. Units with bulk encapsulation (3RT20161AN61, 3RT20161AK61, 3RT20161AB01) are typically bagged individually; box encapsulation indicates standard retail packaging.