Siemens 3RW3034-1AB04 – Compact Soft Starter for 3-Phase Induction Motors | SIRIUS Platform
Engineering Background
The 3RW3034-1AB04 is part of Siemens’ SIRIUS 3RW30 series — a purpose-built line of electronic soft starters designed to reduce mechanical stress and inrush current during motor startup. Engineered for industrial environments where reliable, repeatable motor control is non-negotiable, this unit delivers smooth ramp-up and ramp-down profiles without the complexity of a full variable-frequency drive.
Product Positioning
Targeted at procurement engineers and OEM integrators sourcing proven motor protection components for pump, fan, compressor, and conveyor applications. The 3RW3034-1AB04 occupies the mid-range of the SIRIUS 3RW30 family, balancing compact DIN-rail footprint with robust 18.5 kW motor handling capability at standard 400 V AC supply.
Complete Technical Specifications
- Part Number / SKU: 3RW3034-1AB04
- Manufacturer: Siemens AG
- Product Series: SIRIUS 3RW30
- Rated Motor Power: 18.5 kW (at 400 V, AC-53b utilization category)
- Supply Voltage: 200–480 V AC, 3-phase, 50/60 Hz
- Control Voltage: 110–230 V AC
- Rated Operational Current (Ie): 38 A
- Starting Current Limitation: Adjustable 2× – 5× Ie
- Ramp-Up Time: 1–20 s (adjustable)
- Ramp-Down Time: 0–20 s (adjustable)
- Bypass Relay: Integrated (reduces heat dissipation during run)
- Protection Class: IP20 (front panel)
- Mounting: DIN rail (35 mm) or screw mounting
- Ambient Temperature: –25 °C to +60 °C (operating)
- Weight: 4.46 kg
- Dimensions (W×H×D): 55 × 140 × 145 mm (approx.)
- Standards: IEC/EN 60947-4-2, UL 508, CSA C22.2
- Country of Origin: Germany
Proven Application Environments
- Centrifugal pumps and water treatment systems
- HVAC fans and air-handling units
- Compressors in industrial refrigeration and pneumatic systems
- Conveyor drives in logistics and manufacturing lines
- Mixers and agitators in chemical and food processing plants
- Crusher and mill drives in mining and aggregate industries
Engineering Advantages
- Integrated bypass relay eliminates external bypass contactor, reducing panel space and BOM cost
- Adjustable current ramp protects mechanical couplings and extends motor winding life
- Compact 55 mm width enables high-density panel layouts on standard 35 mm DIN rail
- Wide supply voltage range (200–480 V) supports global deployment without hardware changes
- Motor thermistor input (PTC) provides direct winding temperature protection
- Phase failure and phase sequence monitoring built-in for 3-phase supply integrity
System Architecture & Signal Flow
The 3RW3034-1AB04 uses thyristor (SCR) phase-angle control to progressively increase voltage to the motor terminals during the ramp-up phase. Once the motor reaches full speed, the integrated bypass relay closes, shorting out the thyristors and eliminating conduction losses. Control inputs (IN1/IN2) accept 110–230 V AC signals from PLCs, relay outputs, or manual switches. The thermistor input (T1/T2) connects directly to PTC sensors embedded in motor windings for real-time thermal protection. Fault output relay provides dry-contact signaling to upstream SCADA or PLC systems.
Sourcing & Quality Verification
- All units sourced from authorized Siemens distribution channels or verified industrial surplus with full traceability
- Pre-shipment inspection includes visual check, label verification, and functional continuity test
- Original Siemens packaging and documentation supplied where available
- Counterfeit-risk screening applied: hologram labels, date codes, and PCB markings verified against Siemens reference standards
- Certificate of conformity available upon request for regulated industries
Procurement Process
- Add to cart or submit RFQ via Konmask.com
- Receive order confirmation with lead time and shipping estimate within 1 business day
- Payment accepted: T/T bank transfer, PayPal, credit card (Visa/Mastercard)
- Shipping: DHL Express / FedEx International Priority — typical transit 3–7 business days
- Commercial invoice, packing list, and HS code documentation provided for customs clearance
- Post-delivery technical support available via email and WhatsApp
Technical FAQ
Q: Can the 3RW3034-1AB04 be used with motors larger than 18.5 kW?
A: Not recommended. The rated operational current is 38 A; exceeding this will trigger thermal protection and may damage the unit. Select the next model in the 3RW30 series for higher power ratings.
Q: Does this soft starter support reversing operation?
A: No. The 3RW30 series is designed for unidirectional starting only. For reversing applications, use a separate reversing contactor upstream of the soft starter.
Q: Is a separate motor overload relay required?
A: The 3RW3034-1AB04 includes electronic motor protection (overload, phase failure, thermistor). A separate overload relay is not required but may be added for redundancy per local safety codes.
Q: What is the difference between 3RW30 and 3RW40 series?
A: The 3RW40 series adds fieldbus communication (PROFIBUS, AS-Interface), extended diagnostics, and higher IP rating options. The 3RW30 is optimized for cost-effective standalone applications without bus integration.
Q: Can I get a datasheet or Siemens SIOS documentation?
A: Yes. Contact us at support@konmask.com and we will provide the official Siemens product datasheet and wiring diagram.
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