Siemens 3RT20381AG20 Size S2 Contactor
3RT20381AG20 in Panel Placement
The 3RT20381AG20 is a Size S2 Siemens power contactor intended for chassis or DIN rail mounting in motor control panels and load-center cabinets. Three main poles are wired to the load (AC-3 duty, typically motor starts); auxiliary contacts feed back to the control circuit for status indication or interlock chaining. The contactor carries a 90 A short-circuit rating while the AC-3 frame current is 65 A, placing it above Size S0/S1 units in a typical Siemens panel hierarchy.
| Parameter | Value |
|---|---|
| Coil Voltage | 110 VAC |
| Must Operate Voltage | 93.5 VAC |
| Contact Form | 3PST-NO (3 Form A) |
| Contact Rating (Current) | 90 A |
| Coil Power (inrush) | 210 VA |
| Operate Time | 80 ms |
| Mounting | Chassis Mount, DIN Rail |
| Operating Temperature | 25°C ~ 60°C |
| Encapsulation | Bulk |
Voltage Variants in the 3RT2038 Family
Eight factory-configured alternates share the 3RT2038 base and S2 frame; the part-number suffix encodes coil voltage. The reader must verify suitability of any alternate for the target control-system voltage before substitution.
| MPN | Coil Voltage | Must Operate | Contact Rating | Coil Power |
|---|---|---|---|---|
| 3RT20381AG20 (seed) | 110 VAC | 93.5 VAC | 90 A | 210 VA |
| 3RT20381AG24 | 110 VAC | 93.5 VAC | 65 A | 188 VA |
| 3RT20381AG60 | 100~110 VAC | — | 90 A | 188 VA |
| 3RT20381AL20 | 230 VAC | 195.5 VAC | 80 A | 188 VA |
| 3RT20381AH20 | 48 VAC | 40.8 VAC | 80 A | 188 VA |
| 3RT20381AM20 | 208 VAC | 176.8 VAC | 80 A | 188 VA |
| 3RT20381AC20 | 24 VAC | 20.4 VAC | 65 A | 210 VA |
| 3RT20381AN20 | 220 VAC | 187 VAC | 80 A | 188 VA |
| 3RT20381AQ20 | 500 VAC | 195.5 VAC | 90 A | 188 VA |
3RT20381AG24 differs by auxiliary contact count (2N vs 1N) and lists contact rating at the 65 A frame level rather than the 90 A short-circuit rating. 3RT20381AG60 specifies a wider coil band (100~110 VAC) and ships in box packaging. All other alternates share the seed's 1N auxiliary contact configuration but differ in coil voltage, which changes must-operate thresholds proportionally and reduces the listed short-circuit rating to 80 A.