The Siemens 3RF2150-1AA04 is a single-phase SIRIUS 3RF2 solid-state contactor designed for wear-free, noiseless switching of resistive and inductive AC loads. Rated at 50 A (type current) with a 48–460 V AC operating voltage range, it is controlled by a 15–24 V DC signal and uses screw terminals for main circuit connections.
Unlike electromechanical contactors, this solid-state device has no moving parts, making it ideal for high-switching-frequency applications and noise-sensitive environments such as hospitals, offices, or bottling plants. The compact 22.5 mm width saves valuable space on the heatsink, and the unit can be expanded with standardized 3RF29 function modules for load monitoring or power regulation.
Item No :
3RF2150-1AA04Order(MOQ) :
1Payment :
EXWProduct Origin :
GermanyShipping Port :
Wuhan, Hubei, ChinaLead Time :
3-5 daysWeight :
0.071kgOverview
3RF2150-1AA04 SIMATIC PLC Module
New in stock
Origin from Germany
Payment Method: TT.Western Union
Shipping Method: DHL\UPS\Fedex\EMS\Others
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| Part Number | Description | Key Difference |
|---|---|---|
| 3RF2150-1AA04 | 50 A, 48–460 V AC, 15–24 V DC control (this item) | Standard screw terminal variant |
| 3RF2150-1AA14 | 50 A, 48–460 V AC, 24 V DC/AC control | Wider control voltage range |
| 3RF2150-2AA04 | 50 A, ring cable lug connection | For higher current connection method |
| 3RF2900-0EA18 | Converter function module | For power regulation |
| 3RF2950-0HA13 | Load monitoring module | For detecting load faults |
| Heatsink | Required for full 50 A rating | Consult datasheet for sizing |
Important: The 50 A type current rating is the performance capacity of the solid-state relay. The actual permitted rated operational current depends on the connection method, heatsink, and cooling conditions. A suitable heatsink is required to achieve the full 50 A rating. The M4 screw terminal version is limited to approximately 50 A and 10 mm² conductor cross-section; for higher currents, the ring cable lug version (3RF2150-2AA04) is recommended.
1 × Siemens 3RF2150-1AA04 SIRIUS 3RF2 Solid-State Contactor
Note: Heatsink, function modules, and terminal covers are sold separately.
In Stock – Ready to ship immediately
Genuine Siemens Product – Factory original SIRIUS component
Warranty Included – Purchase with confidence
Technical Support – Application and heatsink sizing assistance available
Q1: What is the Siemens 3RF2150-1AA04?
It is a single-phase SIRIUS 3RF2 solid-state contactor with a 50 A type current rating, 48–460 V AC operating voltage, and 15–24 V DC control signal. It uses zero-point switching and screw terminals for wear-free, noiseless load switching.
Q2: Does this device require a heatsink?
Yes. The 50 A rating is the type current (performance capacity). The actual permitted operational current depends on the heatsink and cooling conditions. A suitable heatsink must be used to achieve the full rating. Without adequate cooling, the permissible current is significantly lower.
Q3: What is zero-point switching?
Zero-point switching means the device turns on when the AC voltage crosses zero. This minimizes inrush current and electrical noise, extending the life of resistive loads such as heaters.
Q4: What is the control voltage for this variant?
The 1AA04 variant uses a 15–24 V DC control signal. For a 24 V DC/AC control variant, see the 1AA14 model.
Q5: What is the minimum load current?
The minimum load current is 500 mA. Loads drawing less than this may not switch reliably.
Q6: Can I use this for inductive loads?
Yes. The device is designed for switching resistive and inductive loads, such as valves and solenoids. The zero-point switching helps reduce stress on inductive loads.
Q7: What is the power loss at rated current?
The power loss is 66 W at the rated current in hot operating condition. This heat must be dissipated by the heatsink.
Q8: What are the dimensions and weight?
Dimensions are 22.5 × 85 × 48 mm (W × H × D). Net weight is approximately 0.068–0.072 kg.
Q9: What is the country of origin?
Germany (DE).
Q10: What should I verify before ordering?
Always verify the exact part number (3RF2150-1AA04 for 15–24 V DC control), confirm your load current and voltage are within the 50 A / 48–460 V AC range, ensure you have a suitable heatsink for your required current, and check whether you need the ring cable lug version (3RF2150-2AA04) for higher current connections.
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