The Siemens 3RT1034-1BG44 is a heavy-duty 3-pole power contactor from the well-known SIRIUS motor control series. It is made to switch and regulate three-phase motors and industrial loads safely and reliably. With an AC-3 rating of 32 A at 400 V and a motor power of up to 15 kW, it is a strong solution for automation applications where starting, halting, and reversing happen a lot. The unit has a 125 V DC control coil and built-in auxiliary connections, which makes it easy to add to modern control panels and interlock systems.
This contactor is made to strict German quality standards and has a long electrical life, a high switching capacity, and works with Siemens SIRIUS overload relays and accessories. Its small S2 frame size and screw terminals make it easy to install and upgrade in MCCs, control cabinets, and motor starter combinations.
Siemens 3RT1034 Contactor Features:
1) High-performance 3-pole motor contactor with a 400 V AC-3 rating of 32 A, good for three-phase motors up to 15 kW in industrial application.
2) With 2 NO + 2 NC auxiliary contacts built in, you may construct interlocking, signaling, and control circuits that are more flexible without needing extra parts in many cases.
3) The 125 V DC control coil makes DC control systems work exactly as they should and is perfect for PLC-based panels and process control settings.
4) The small S2 SIRIUS design with screw terminals makes wiring quick, connections reliable, and integration into MCCs and control cabinets simple.
5) Built to IEC 60947 standards, these products have a long service life and are reliable in tough industrial situations since they can handle a lot of electrical and mechanical stress.
Technical Specifications: 3RT1034
| Category | Specification | Value ​ |
|---|---|---|
| Product Designation | Product brand name | SIRIUS |
| Size of contactor | S2 | |
| Electrical Ratings | Insulation voltage (rated) | 690 V |
| Rated operational current AC-3 at 400 V | 32 A | |
| Rated operational current AC-3 at 690 V | 20 A | |
| Rated operational power AC-3 at 400 V | 15 kW | |
| Rated operational power AC-3 at 230 V | 7.5 kW | |
| Rated operational power AC-3 at 500/690 V | 18.5 kW | |
| Rated operational power AC-1 at 400 V | 31 kW | |
| Thermal short-time current (10 s) | 320 A | |
| Control Circuit | Control supply voltage (rated) | 125 V DC |
| Operating range factor (DC) | 0.8 … 1.1 | |
| Closing/Holding power of magnet coil (DC) | 13.3 W | |
| Main Circuit | Number of poles | 3 (3 NO, 0 NC) |
| Operating current AC-1 at 400 V (40 °C) | 50 A | |
| Connectable conductor cross-section (main, solid) | 2x (0.75 … 16 mm²) | |
| Auxiliary Circuit | Auxiliary contacts | 2 NO + 2 NC |
| Operating current AC-15 at 230 V | 6 A | |
| Operating current DC-13 at 24 V | 10 A | |
| Mechanical | Mechanical service life (typical) | 10,000,000 cycles |
| Dimensions (H x W x D) | 112 x 55 x 179 mm | |
| Mounting type | Screw/snap-on on 35 mm DIN rail | |
| Environmental | Ambient temperature (operation) | -25 … +60 °C |
| Ambient temperature (storage) | -55 … +80 °C | |
| Installation altitude (max) | 2,000 m | |
| Protection class (front/terminals) | IP20 / IP00 | |
| Other | Switching frequency AC-3 (max) | 1,000 /h |
| Short-circuit protection (main circuit, type 1) | gL/gG 125 A |
Siemens 3RT1034-1BG44 Datasheet
Applications and Usage
- Motor starters for process plants, HVAC systems, and water treatment plants that run pumps, fans, compressors, and conveyors.
- For smooth starting of medium-power three-phase motors, use reversing and star-delta starter combinations with the right wiring and accessories.
- Control of resistive and mixed industrial loads, like heaters, small distribution feeders, and power circuits, within their AC-1/AC-3 limits.
- Integration with automation panels with PLC I/O for controlling motors from a distance, showing their status, and safety circuits that are interlocked.
- Retrofit and maintenance replacement for current Siemens SIRIUS 3RT1034 installations that need a 3-pole 32 A contactor with a DC coil and extra connections.
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