Siemens SIRIUS 3RW52 / 3RW55 Soft Starter

Siemens SIRIUS 3RW52 / 3RW55 Soft Starter

Siemens SIRIUS 3RW52 / 3RW55 Soft Starter — 3RW5224-1TC14 / 3RW5245-6TC04 / 3RW5235-6TC04 | Shop On Ebay

Factory New Parts : Warranty 12 Months​
Refurbished Units : Warranty 3-6 Months​
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Technical / Configuration Support Available​
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Description

The Siemens 3RW5224-1TC14​ and related 3RW52 / 3RW55 series soft starters​ are designed for gentle start-up and ramp-down of three-phase induction motors, reducing inrush current and mechanical stress on the driven load. The listed models — 3RW5224-1TC14 (24 A, 11 kW @400V), 3RW5235-6TC04 (35 A, 15 kW), 3RW5245-6TC04 (45 A, 22 kW)​ — belong to the SIRIUS 3RW52 compact line, featuring screw terminals, thermistor input (PTC)​ for direct motor winding temperature protection, and control supply 110–250 V AC/DC.

Key Features

  • Rated Operational Current: 24 A (3RW5224), 35 A (3RW5235), 45 A (3RW5245) — main circuit 200–480 V AC.
  • Thermistor Input (TC suffix): Accepts PTC thermistor sensors (usually 3-wire) from motor winding — trips soft starter on overtemperature (protects motor from overheating even during stall/low-speed).
  • Control Voltage: 110–250 V AC/DC (wide range — check exact suffix: -1TC14 = 110–250V AC/DC).
  • Soft Functions: Adjustable ramp-up (0.5–60 s), soft stop (0.5–60 s), current limiting (2–6 × Ie), kick-start.
  • By-pass Recommendation: For motors > 45 kW or frequent starts, external by-pass contactor (3RA2 series + 3RW5900 link module) recommended — 3RW52 has no internal by-pass.
  • Country of Origin: Germany / Austria

Model & Specification Table

Order No.
Series
Rated Current
Motor Power (@400V)
Main Voltage
Thermistor Inp.
Notes
3RW5224-1TC14​
3RW52 Compact
24 A​
~11 kW / 15 HP
200–480 V AC
✅ PTC (TC suffix)
Small-mid pump/fan/conveyor
3RW5235-6TC04​
3RW52 Compact
35 A​
~15 kW / 20 HP
200–480 V AC
✅ PTC
General purpose mid-range
3RW5245-6TC04​
3RW52 Compact
45 A​
~22 kW / 30 HP
200–480 V AC
✅ PTC
Larger fans/pumps (ext. bypass rec.)
⚠️ Important:
  1. Thermistor (PTC) Wiring: TC suffix = terminals for 3-wire PTC (typically terminals 95-96-98 — consult manual). If motor has embedded PTC, connect directly — soft starter will go to fault if R_ptc exceeds trip threshold (usually 1.5–4 kΩ depending on PTC curve).
  2. By-pass Required for ≥ 45 kW: 3RW5245 is at the boundary — frequent starts or continuous duty → use external by-pass contactor to reduce thyristor heating.
  3. Control Voltage Suffix: -1TC14 = Us 110–250 V AC/DC. Confirm your panel control voltage before ordering.
  4. No Pump Stop on 3RW52: For water hammer reduction (pump stop ramp-down), consider 3RW55 series (e.g., 3RW5545-2HA14 — but note 3RW55 thermistor input may be a separate option card on some versions).

Technical Specifications (Representative — 3RW5224-1TC14, 24 A, 200–480V, PTC Input)

Parameter
Specification
Model / Order Code​
3RW5224-1TC14 (SIRIUS 3RW52 Soft Starter)
Rated Operational Current (Ie)​
24 A (at 40 °C, 3-phase 400V AC)
Main Circuit Voltage (Ue)​
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 ~11 kW (AC-3 duty)
Starting Time (Ramp-up)​
0.5–60 s (adjustable)
Stopping Time (Ramp-down)​
0.5–60 s (soft stop — if enabled)
Current Limiting​
Adjustable 2–6 × Ie
Thermistor (PTC) Input​
Yes — 3-wire PTC sensor connection (trip on overtemperature)
Overload Protection​
Electronic motor overload (CLASS 10/20/30 selectable)
By-pass Requirement​
External by-pass contactor recommended for frequent starts / > 45 kW
Connection Type​
Screw terminals (power & control)
Mounting​
Screw-mount on panel (DIN rail adapter avail. separately)
Dimensions (W×H×D)​
Approx. 110 mm × 225 mm × 150 mm (3RW5224)
Weight​
~ 3.5 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 per load (conveyor = longer ramp; pump = shorter)
    • PTC thermistor wiring & trip threshold check (measure cold/hot resistance vs. PTC curve)
    • By-pass contactor sizing (3RA2 + 3RW5900 link module)
    • Fault codes (F01 = thyristor overtemp, F02 = motor overload, F03 = PTC trip)
  • Cross-reference vs. ABB PST / Schneider ATS48 / Allen-Bradley SMC-3

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 clones
  • Global supply network with competitive pricing
  • Expertise in motor starting solutions (DOL → soft start retrofit, bypass design, PTC integration)
  • Comprehensive technical documentation (setting tables, dimensional drawings, PTC wiring diagram)
  • Responsive customer service and support

Applications

  • Pumps / Fans / Blowers: Reduced inrush & mechanical stress.
  • Conveyors / Material Handling: Smooth acceleration prevents product shift.
  • Compressors / Mixers (light start): 3RW52 suitable; for high-inertia consider 3RW55 torque control.
  • HVAC / Water Treatment: Retrofit DOL starters for gentler motor acceleration.
  • Motor Protection: Integrated PTC input adds direct winding temp. monitoring beyond electronic OL.

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