Siemens 3RT20281AG24 Electromechanical Contactor
Key Specifications — 3RT20281AG24
| Parameter | Value |
|---|---|
| Contact Rating | 38 A |
| Coil Voltage | 110 VAC |
| Must Operate Voltage | 93.5 VAC |
| Contact Form | 3PST-NO (3 Form A) |
| Mounting Type | Chassis Mount, DIN Rail |
| Coil Power | 79 VA |
| Operate Time | 40 ms |
| Operating Temperature | 25°C ~ 60°C |
The contactor ships in a box enclosure with auxiliary contacts and shares the 3RT2028 base PN with all listed alternates. Both the main poles and auxiliary contacts operate simultaneously; the auxiliary contact arrangement is the primary differentiator within this family series.
Family Comparison — 3RT2028 Series Variants
| Spec | 3RT20281AG24 | 3RT20281AG20 | 3RT20281AG60 | 3RT20281AN24 |
|---|---|---|---|---|
| Coil Voltage | 110 VAC | 110 VAC | 100 VAC | 220 VAC |
| Contact Rating | 38 A | 38 A | 38 A | 38 A |
| Must Operate Voltage | 93.5 VAC | 93.5 VAC | 93.5 VAC | 187 VAC |
| Coil Power | 79 VA | 79 VA | 79 VA | 79 VA |
| Operate Time | 40 ms | 40 ms | 40 ms | 40 ms |
| Aux. Contacts | 2NO/2NC | 1NO/1NC | 1NO/1NC | 2NO/2NC |
| Mounting | Chassis/DIN Rail | Chassis/DIN Rail | Chassis/DIN Rail | Chassis/DIN Rail |
| Operating Temp | 25°C~60°C | 25°C~60°C | 25°C~60°C | 25°C~60°C |
Readers must qualify each variant independently before committing to a specific coil voltage or auxiliary contact configuration. All entries share the same 38 A contact rating, 79 VA coil power, and 40 ms operate time.
- 3RT20281AG20 — same 110 VAC coil and 38 A rating but with 1NO/1NC auxiliary instead of 2NO/2NC; suitable when fewer auxiliary contacts are required.
- 3RT20281AG60 — 100 VAC coil instead of 110 VAC; must-operate shifts to 93.5 VAC, maintaining 1NO/1NC auxiliary.
- 3RT20281AN24 — 220 VAC coil with 187 VAC must-operate; retains 2NO/2NC auxiliary but differs in control voltage tier.
Additional voltage tiers within the same 3RT2028 base series include 230 VAC (3RT20281AL24), 24 VAC (3RT20281AC24), 240/380 VAC ambiguity (3RT20281AU20), and 48 VAC (3RT20281AH20). The 3RT20281AU20 entry shows a coil voltage inconsistency that warrants on-record verification before procurement.