Description
The Siemens 3RW5545-2HA14 is a high-performance SIRIUS 3RW55 soft starter designed for heavy-duty motor starting of three-phase induction motors up to 200–480 V AC, 171 A rated operational current (approx. 90 kW / 125 HP @ 400V). It features closed-loop torque control, adjustable ramp-up/ramp-down times, current limiting, and integrated analog output (4–20 mA) for motor current monitoring. The 3RW52 series (e.g., 3RW5236-6AC14) is the compact economy line for smaller motors with basic soft-start/soft-stop functions.
Both units use screw terminals for power and control wiring and operate with a control supply voltage of 110–250 V AC/DC. The 3RW55 series offers advanced protection functions (motor overload, phase failure, thyristor overheating) and is suitable for demanding applications such as conveyors, compressors, pumps, and crushers.
Key Features
- Rated Operational Current: 171 A (3RW5545-2HA14) — suits motors up to ~90 kW @ 400V AC.
- Supply Voltage: 200–480 V AC (3-phase main circuit).
- Control Voltage: 110–250 V AC/DC.
- Starting Functions: Soft Start, Soft Stop, Pump Stop (for water hammer reduction), Kick-start.
- Torque Control: Closed-loop torque ramp control (3RW55) — minimizes inrush current & mechanical stress.
- Analog Output: 4–20 mA proportional to motor current (3RW5545-2HA14).
- Protection: Motor overload (via settable CLASS 10/20/30), phase failure, thyristor temp., undervoltage.
- Country of Origin: Germany / Austria
Model Comparison Table
Model | Series | Rated Current | Motor Power (@400V) | Key Features | Typical Use |
|---|---|---|---|---|---|
3RW5545-2HA14 | 3RW55 (Advanced) | 171 A | ~90 kW / 125 HP | Torque ctrl, Analog out, Pump Stop, Wide setting range | Heavy conveyors, compressors, crushers |
3RW5236-6AC14 | 3RW52 (Compact) | 36 A | ~15 kW / 20 HP | Basic soft-start/stop, current limit, hysteresis O/L | Fans, pumps, mixers (less severe starts) |
⚠️ Important Selection & Installation Notes:
Technical Specifications (Representative — 3RW5545-2HA14)
Parameter | Specification |
|---|---|
Model / Order Code | 3RW5545-2HA14 (SIRIUS 3RW55) |
Rated Operational Current (Ie) | 171 A (at 40 °C, 3-phase 400V AC) |
Main Circuit Voltage | 200–480 V AC (50/60 Hz) |
Control Supply Voltage (Us) | 110–250 V AC/DC (50/60 Hz) |
Motor Power Rating (Typical @400V) | Up to ~90 kW (AC-3 duty) |
Starting Time (Ramp-up) | 0.5–60 s (adjustable) |
Stopping Time (Ramp-down / Pump Stop) | 0.5–60 s (soft stop); Pump Stop function available |
Current Limiting | Adjustable (2–6 × Ie) |
Torque Control | Yes — closed-loop (reduces inrush to ~2–3 × Ie) |
Analog Output | 4–20 mA (proportional to motor current, scalable) |
Digital Inputs/Outputs | Enable, Fault Relay (1 NO+1 NC), Running (1 NO) |
Overload Protection | Electronic motor overload (CLASS 10/20/30 selectable) |
By-pass Arrangement | External by-pass contactor recommended (internal bypass NOT included in -2HA14) |
Connection Type | Screw terminals (power & control) |
Mounting | 35 mm DIN rail (with adapter) or screw-mount on panel |
Dimensions (W×H×D) | Approx. 210 mm × 310 mm × 185 mm |
Weight | ~ 9 kg |
Standards | IEC 60947-4-2, UL 508, CSA C22.2, CE, RoHS |
Warranty & After-Sales
- Factory new units: 12 months warranty
- Refurbished units: 3-6 months warranty
- Technical support for:
- Ramp time & current limit setting for specific load type (conveyor = longer ramp; centrifugal pump = shorter)
- Bypass contactor sizing & wiring (3RA2 series + link module 3RW5900)
- Analog output scaling & PLC connection (4–20 mA → 0–I_max)
- Fault diagnosis (Fxxx codes: F01 = thyristor overtemp, F02 = motor overload, etc.)
- Cross-reference vs. ABB PST / Schneider ATS48 / Allen-Bradley SMC-3 if required
Delivery Time
- Standard delivery: 3-5 working days (stock items)
- Express shipping available upon request
Why Choose Our Store
- Genuine Siemens SIRIUS soft starters — not rewound/rebuilt clones
- Global supply network with competitive pricing
- Expertise in motor starting solutions (star-delta → soft start retrofit, bypass design)
- Comprehensive technical documentation (setting tables, dimensional drawings, wiring diagrams)
- Responsive customer service and support
Applications
- Conveyors / Bulk Handling: Smooth start/stop reduces belt/jerk stress.
- Centrifugal & Positive Displacement Pumps: Pump Stop function reduces water hammer.
- Compressors / Crushers / Mixers: High inertia starts benefit from torque-controlled ramp.
- HVAC / Water Treatment: Fan & pump soft starting to limit inrush on weak supplies.
- Retrofit: Replace DOL (direct-on-line) or star-delta starters for gentler acceleration.
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