Siemens 3RT20282AG24 S0 Contactor, 38 A 110 VAC
The 3RT20282AG24 is a Siemens Sirius S0-frame 3-pole industrial contactor rated 38 A continuous at up to ~690 VAC, equipped with two normally open and two normally closed auxiliary contacts, and controlled by a 110 VAC coil. The device mounts directly to DIN rail or chassis in a compact box-style housing typical of the 3RT2 S0 series.
Electrical and Coil Characteristics
Coil and Operating Parameters
| Parameter | Value |
|---|---|
| Coil Voltage | 110 VAC |
| Coil Power | 79 VA |
| Must Operate Voltage | 93.5 VAC |
| Operate Time | 40 ms |
The 110 VAC coil class aligns with standard industrial control-voltage levels in many 50/60 Hz plant distributions. The must-operate threshold of 93.5 VAC ensures pull-in under moderate supply sag before the coil de-energizes.
Main Contact Ratings
| Parameter | Value |
|---|---|
| Contact Form | 3PST-NO (3 Form A) |
| Contact Rating (Current) | 38 A |
| Switching Voltage (main) | Up to ~690 VAC (series nominal) |
The three main poles are normally open and rated 38 A, suitable for direct-on-line motor loads and branch switching within the S0 frame current class.
Mechanical, Environmental, and Auxiliary Features
Physical and Environmental Data
| Parameter | Value |
|---|---|
| Mounting Type | Chassis Mount, DIN Rail |
| Encapsulation | Box |
| Operating Temperature | 25°C ~ 60°C |
| Features | Auxiliary Contacts |
The box-style encapsulation provides basic environmental protection for the contactor body. Operating temperature is specified from 25°C to 60°C, reflecting the thermal class of S0 frame devices under typical panel conditions.
Auxiliary Contact Configuration
The 2NO/2NC auxiliary contact block (suffix "G24" in the MPN) provides two independently wired normally open and two normally closed contacts for control-circuit feedback, interlock, or PLC signal wiring.
Catalog Comparison: S0 38 A Contactors at 110 VAC
The 3RT20282AG20 is the sole in-catalog alternative sharing the 110 VAC coil class. The two parts are listed side by side below for screening purposes only; neither is an approved substitute for the other.
| Parameter | 3RT20282AG24 | 3RT20282AG20 |
|---|---|---|
| Coil Voltage | 110 VAC | 110 VAC |
| Coil Power | 79 VA | 79 VA |
| Must Operate Voltage | 93.5 VAC | 93.5 VAC |
| Contact Rating (Current) | 38 A | 38 A |
| Contact Form | 3PST-NO (3 Form A) | 3PST-NO (3 Form A) |
| Aux Contacts | 2NO/2NC | 1NO/1NC |
| Operate Time | 40 ms | 40 ms |
| Mounting | Chassis, DIN Rail | Chassis, DIN Rail |
The two MPNs share identical electrical and mechanical specifications except for auxiliary contact count. The 2NO/2NC arrangement in the AG24 provides greater flexibility for control logic compared to the 1NO/1NC arrangement in the AG20.
Selection Notes for S0 38 A Coil Families
The Siemens 3RT2028 S0 series is offered across multiple standard coil voltages: 24 VAC, 110 VAC, 220 VAC, and 230 VAC. All share the same 38 A main pole rating and physical footprint, differing only in the coil class. The choice of coil voltage depends on the available control-circuit voltage in the target installation and any coordination requirements with upstream control devices.
When auxiliary contact needs vary within the same main pole rating, the series offers variants with 2NO/2NC, 1NO/1NC, and 2NO/0NC configurations. The 2NO/2NC option (suffix G24/G20) is preferred when both feedback and interlock contacts are required, while the 1NO/1NC option suits simpler two-wire interlock schemes.
FAQ
What is the main pole rating of the 3RT20282AG24? The main poles are rated 38 A continuous at up to approximately 690 VAC, configured as three normally open contacts (3PST-NO).
What auxiliary contact configuration does the 3RT20282AG24 include? It includes two normally open and two normally closed auxiliary contacts for control-circuit use.
What mounting options are available for the 3RT20282AG24? The contactor supports both chassis mount and standard DIN rail mounting.