Siemens 3RT20251AK60 S0 Contactor
Panel / Cabinet Placement
The S0 form factor suits compact control enclosures where DIN-rail mounting saves panel depth. Bulk packaging in the seed entry reflects quantities typical forOEM panel assembly; box-packaged alternates suit distributors or spare-stock workflows.
3RT20251AK60 Primary Specifications
| Spec | Value |
|---|---|
| Coil Voltage | 120VAC |
| Must Operate Voltage | 96 VAC |
| Coil Power | 68VA |
| Contact Rating | 40 A |
| Contact Form | 3PST-NO (3 Form A) |
| Auxiliary Contacts | 1NO / 1NC |
| Mounting | Chassis Mount, DIN Rail |
| Operate Time | 38 ms |
| Operating Temperature | 25°C ~ 60°C |
| Encapsulation | Bulk |
| Base Product Number | 3RT2025 |
The 3RT2025 base covers multiple S0 contactors sharing the same coil-voltage series and mounting footprint. The seed lists 40 A contact rating; most alternates in this family show 17 A (IEC AC-3 utilization categories). Pickup at 96 VAC provides 20 % voltage margin above the 120VAC coil rating.
Key Selection Differentiators
Contact Rating (IEC Utilization Categories)
The seed 3RT20251AK60 carries a 40 A rating, while most alternates specify 17 A. Panel builders selecting for motor-starting duty should verify whether the 40 A figure is a make/break rating or continuous rating and cross-reference the intended utilization category (AC-1 vs AC-3).
Coil Voltage and Must-Operate Threshold
All variants share identical mounting and contact geometry but differ in coil voltage from 120VAC through 600VAC. Must-operate voltage scales proportionally (e.g., 96 VAC for 120VAC coil; 510 VAC for 600VAC coil). Confirm supply voltage compatibility before specifying an alternate.
Contact Configuration (Auxiliary States)
The seed and three alternates (3RT20251AK601AA0, 3RT20251AV60, 3RT20251AN60, 3RT20251AR60, 3RT20251AT60, 3RT20251AU60) carry 1NO/1NC auxiliary contacts. Two alternates (3RT20251AK64, 3RT20251AK643MA0) carry 2NO/2NC — useful when separate status signals or parallel control paths are required.