Siemens 3RT20371AN60 Contactors
3RT20371AN60 — Part Number and Family Context
The prefix 3RT designates this as a Siemens power contactor in the Class 3 (size S2) form factor. The subsequent characters in the part number encode the functional variant and coil voltage class — specifically, the AN position indicates the auxiliary contact configuration and the 60 suffix typically denotes the 200–220 VAC coil range for this series.
This part is a three-pole contactor rated for AC-3 duty at approximately 30 kW (380–440 V systems), with an integrated auxiliary contact block providing one normally open and one normally closed contact.
Operating Specifications
| Parameter | Value |
|---|---|
| Base Product Number | 3RT2037 |
| Contact Form | 3PST-NO (3 Form A) |
| Contact Rating (Current) | 80 A |
| Coil Voltage | 200–220 VAC |
| Coil Power | 188 VA |
| Operate Time | 80 ms |
| Operating Temperature | 25°C to 60°C |
| Mounting Type | Chassis Mount, DIN Rail |
| Encapsulation | Box |
The 80 A contact rating and 188 VA coil consumption are the primary selection anchors. The contact form confirms three independent power poles, each suitable for motor switching in AC-3 duty. The DIN Rail mounting option facilitates panel or cabinet installation without custom hardware.
Auxiliary Contact Configuration
The 1NO + 1NC auxiliary configuration serves typical control-circuit needs such as status indication, interlocking, or PLC signal input. These auxiliary contacts are mechanically linked to the main pole assembly, meaning their state follows the contactor's primary position.
Comparison with Catalog Variants
The catalog lists multiple 3RT2037-series variants with different coil voltages. The shared specifications across all catalog entries include:
| Parameter | 3RT20371AN60 (seed) | 3RT20371AN20 | 3RT20371AU60 | 3RT20371AR60 |
|---|---|---|---|---|
| Contact Rating | 80 A | 65 A | 65 A | 65 A |
| Coil Voltage | 200–220 VAC | 220 VAC | 277 VAC | 400–440 VAC |
| Coil Power | 188 VA | 188 VA | 190 VA | 188 VA |
| Contact Form | 3PST-NO | 3PST-NO | 3PST-NO | 3PST-NO |
| Mounting | DIN Rail | DIN Rail | DIN Rail | DIN Rail |
The seed variant carries the highest stated contact rating (80 A) among the catalog entries at its coil voltage class. Coil power varies minimally across the series, clustering near 188–212 VA.
Why the Closest Alternates Are Catalog-Similar
3RT20371AN20 (similarity 1.0): Same base product number and series, identical mounting and auxiliary contact features, but rated at 65 A with a single-voltage 220 VAC coil instead of the 200–220 V range. The must-operate voltage of 187 VAC falls within the seed's coil window.
3RT20371AU60 (similarity 0.96): Shares all core specifications except the coil voltage is 277 VAC — outside the seed's 200–220 V range. Contact rating is 65 A. The higher coil voltage indicates a different control-circuit arrangement; must-operate is 221.6 VAC.
3RT20371AR60 (similarity 0.96): Operates at 400–440 VAC coil range, suitable for higher-voltage control circuits. Contact rating is 65 A. The seed's 200–220 V coil makes these non-interchangeable in the same control-voltage environment.
These catalog rows share the same mechanical form factor, series family, and auxiliary contact logic, but the coil voltage and current rating differences require re-evaluation for any given application.
Frequently Asked Questions
What is the intended AC-3 power rating of the 3RT20371AN60? The catalog title references approximately 30 kW at standard three-phase voltages (380–440 V), consistent with the 80 A contact rating. The actual applicable motor power depends on the specific system voltage and coordination class chosen.
Can the 3RT20371AN60 be mounted on a standard DIN rail? Yes. The mounting type is listed as Chassis Mount with DIN Rail option. This permits installation in standard control panels without bespoke hardware.
What coil voltage is required for this contactor? The coil is specified for 200–220 VAC operation at 188 VA. Control circuits must deliver voltage within this range for reliable pickup and hold.