Siemens 3RT20161AN21 S00-Size Contactors
Overview
In a motor branch or lighting feeder circuit, the 3RT20161AN21 occupies the S00 frame position—smallest in the Siemens power-contactor lineup—and provides three normally-open power poles plus an auxiliary-contact function. The catalog entry records a 220 VAC coil, a 9 A contact rating, and a 35 ms operate time; the 3RT2016 base number is shared across the entire S00 three-phase contactor family.
Verification required — The data source does not provide: breaking capacity (I_c / Icu / Ics), electrical endurance cycles, mechanical endurance cycles, switching voltage limits, coil release/drop-out voltage, weight, overall dimensions, terminal detail, or IP / protection-class ratings. These are mandatory for coordination studies and panel layout. Do not select on the fields below alone.
Key Parameters
| Parameter | Value (from JSON) | Notes |
|---|---|---|
| Base Product Number | 3RT2016 | Shared by all S00-size three-phase contactors in this series |
| Contact Rating (Current) | 9 A | AC-3 utilization category not confirmed in supplied fields |
| Contact Form | 3PST-NO (3 Form A) | Three independent normally-open power poles |
| Coil Voltage | 220 VAC | Verify mains compatibility before wiring |
| Coil Power | 24.3 VA | Inrush apparent power; release power not in data |
| Must Operate Voltage | 187 VAC | Coil pulls in at ≤ 187 VAC; drop-out threshold not listed |
| Operate Time | 35 ms | Pick-up delay; release time not supplied |
| Operating Temperature | 25°C ~ 60°C | No cold-temperature limit provided |
| Mounting Type | Chassis Mount, DIN Rail | S00 form factor; enclosure / IP rating not specified |
| Encapsulation | Box | Suggests standard shipped configuration; verify with datasheet |
| Features | Auxiliary Contacts | One auxiliary contact integrated; normally-open or normally-closed state not specified in supplied fields |
Ordering-Code / Family Context
The prefix 3RT20 denotes Siemens power contactors in the S00 size class (frame designation 00 per IEC 60947-1). The characters following encode coil voltage and auxiliary-contact arrangement. Without the full Siemens ordering-code tables, the suffix 1AN21 cannot be decoded into exact auxiliary-contact type and verification of AC-3 / AC-1 ratings must come from the official datasheet. The listed alternates share the same base number and mounting form factor but differ in coil voltage or auxiliary-contact polarity.
Installation Notes (Generic — Verify with Datasheet)
The S00 contactors are typically panel-mounted on DIN rail or direct chassis; the catalog confirms both mounting options exist. Key items not confirmed in the supplied fields:
- Overall dimensions and fixing-centre distances
- Terminal screw size and tightening torque
- Acceptable wire gauge and stranding
- Required clearance to adjacent devices
- IP rating of the installed assembly
Selection Considerations
- Coil voltage match — Confirm the 220 VAC coil matches the available control-circuit voltage. The must-operate voltage (187 VAC) sets the lower bound; the drop-out voltage is absent and must be confirmed.
- Auxiliary contact state — The title reads "1NO" (one normally open); the specs list "Features: Auxiliary Contacts" without specifying NO/NC polarity. Verify before wiring interlock or indication circuits.
- Current derating — The 9 A rating is stated without an explicit utilization category. Siemens S00 contactors commonly carry AC-3 ratings; the absence of this designation means selection should not proceed without confirming the intended duty (AC-1, AC-3, DC, or resistive/heating).
- Operating temperature — The range 25°C ~ 60°C is narrow; no lower limit is listed. Cold-climate installations require datasheet confirmation.
- Coordination — Breaking capacity and short-circuit protective device coordination data are not in the supplied fields; this is a critical gap for motor feeder design.
Similar Catalog Parts
| Primary vs Alternate | Shared Spec Keys | Coil Voltage | Contact Rating | Operate Time | Similarity (0–1) |
|---|---|---|---|---|---|
| 3RT20161AN21 vs 3RT20161AN22 | Base Product Number, Coil Power, Contact Form, Mounting Type, Must Operate Voltage, Operate Time, Operating Temperature | 220 VAC (both) | 9 A (both) | 35 ms (both) | 1.00 |
| 3RT20161AN21 vs 3RT20161AN61 | Contact Rating, Contact Form, Mounting Type, Must Operate Voltage, Operate Time | 220 vs 200 VAC | 9 A (both) | 35 ms (both) | 1.00 |
| 3RT20161AN21 vs 3RT20161AK21 | Base Product Number, Coil Power, Contact Rating, Contact Form, Mounting Type, Operate Time | 220 vs 120 VAC | 9 A (both) | 35 ms (both) | 0.96 |
Why they are similar
- 3RT20161AN22 (similarity 1.00): Shares the same 220 VAC coil and S00 frame; the catalog title indicates a 1NC auxiliary contact versus the primary's 1NO. The reason string references shared parameters across the full series. The auxiliary-contact polarity difference must be verified if the interlock logic depends on normally-open versus normally-closed state.
- 3RT20161AN61 (similarity 1.00): Matches the primary in form factor and current rating but uses a 200 VAC coil (coil power 26.4 VA vs 24.3 VA) and ships in bulk packaging. Not a drop-in substitute where 220 VAC control power is specified.
- 3RT20161AK21 (similarity 0.96): Same base and 9 A rating; coil voltage is 120 VAC (must-operate 102 VAC). Useful if a lower control voltage is available; verify that the 187 VAC must-operate spec does not apply.
FAQ
Q: What is the breaking capacity of the 3RT20161AN21 when used in a motor feeder? A: The supplied catalog fields do not include I_c, Icu, or Ics ratings. The breaking capacity must be obtained from the Siemens 3RT2016 datasheet for coordination and short-circuit withstand selection.
Q: Can the 3RT20161AN21 be substituted with the 3RT20161AN22 in an existing 220 VAC control circuit? A: Both parts share the same 220 VAC coil and base product number. The difference lies in auxiliary-contact polarity (1NO vs 1NC per catalog titles). Verify that the auxiliary-contact function (interlock, indication, orPLC signal) matches the desired logic before substitution.
Q: What is the maximum switching voltage for the power poles of the 3RT20161AN21? A: The data source did not provide a maximum switching voltage field. For three-phase AC motor or feeder applications this parameter is essential; consult the official Siemens datasheet for the 3RT2016 series before specifying.