Motor and load switching
SIRIUS 3RT Contactors
A coordinated contactor portfolio for reliable switching of motors and other industrial loads, with broad coil, connection and accessory options.
The switching element in direct, reversing, star-delta and coordinated motor feeders when selected with suitable protection and overload devices.
Request exact article number Selection is confirmed against motor, I/O, network and destination data.
Technical parameters
Selection data
These values describe the product family and the decisions behind selection. The exact datasheet is tied to the complete Siemens article number.
ParameterFamily rangeEngineering note
PortfolioMultiple frame sizes and current ratingsSelect by utilization category, voltage, current and operating frequency.
UtilizationMotor and non-motor load variantsAC-3/AC-4 motor duty differs from resistive or capacitor switching.
CoilAC, DC and electronic coil variantsControl voltage, tolerance and PLC interface must match the circuit.
ConnectionScrew and spring-type options by sizeConfirm conductor size, terminal technology and assembly method.
AccessoriesAuxiliary contacts, interlocks, surge suppression and linksAccessories must match the contactor size and generation.
CoordinationUsed with 3RV2 / overload protectionShort-circuit coordination requires a verified device combination.
Common search questions
Quick answers for SIRIUS 3RT Contactors.
Family guidance narrows the request. The exact Siemens article number remains the final commercial and technical identity.
What is SIRIUS 3RT Contactors best suited for?
The switching element in direct, reversing, star-delta and coordinated motor feeders when selected with suitable protection and overload devices. Typical applications include motor starters, conveyors, pumps and fans.
Which information is required to select SIRIUS 3RT Contactors?
Start with load type and utilization category, motor kw/current and voltage, starts per hour and reversing/jogging duty, control voltage. Final ratings and accessories are confirmed against the full article number and current manufacturer data.
Can SIRIUS 3RT Contactors be quoted from a model name only?
A model name identifies a family, not always the exact hardware. Honghao checks the complete article number, electrical data, options, accessories, lifecycle status, quantity and destination before confirming the offer.
Good fit
Use it when
- Direct-on-line starters
- Reversing starters
- Star-delta starters
- General industrial load switching
Selection limits
Check before specifying
- A contactor alone does not provide motor overload or short-circuit protection
- Electrical and mechanical life depend strongly on duty
- Exact ratings, functions, approvals and lifecycle status depend on the complete Siemens article number and firmware. Honghao confirms these against the requested BOM before quotation.
Strengths
Why this family
- Broad modular portfolio
- Compact panel integration
- Coordinated accessories
- Reliable switching for motor feeders
Typical BOM
Accessories
- Auxiliary contacts
- Mechanical interlock
- Surge suppressor
- Link module
- Overload relay or motor starter protector
Application data
What to send
- Load type and utilization category
- Motor kW/current and voltage
- Starts per hour and reversing/jogging duty
- Control voltage
- Required protection coordination and standard
Technical basis
Manufacturer data remains the final reference.
Honghao uses family-level guidance to structure the enquiry. Final ratings, options, certificates and lifecycle status are checked against the exact article number and current manufacturer documentation.
Typical applications
Where it is used
RFQ checklist
Get a usable quotation
Send the full article number if it is a replacement. For a new application, send the project data listed above, quantity, destination country and required delivery date.
Send BOM or application dataExact configuration