Description
The Siemens 3RW5246-6AC15 is a SIRIUS 3RW52 series compact soft starter for three-phase induction motors up to 200–600 V AC main circuit, 171 A rated operational current (approx. 90 kW / 125 HP @ 400V, up to 110 kW @ 500V). It provides soft start / soft stop with adjustable ramp times and current limiting, plus an analog output (4–20 mA) for motor current monitoring — a step up from base 3RW52 models. The related 3RW5236-6AC15 covers smaller motors (36 A / ~15 kW) with the same control voltage (110–250 V AC/DC) and screw terminals.
Both units are designed for general-purpose motor starting where reduced inrush and mechanical stress are required, with integrated electronic motor overload protection (class 10/20/30 selectable), phase-failure detection, and thyristor temperature monitoring. For heavy-duty starts with closed-loop torque control, the 3RW55 series (e.g., 3RW5545-2HA14 for 480V max) is the appropriate upgrade.
Key Features
- Rated Operational Current: 171 A (3RW5246-6AC15) / 36 A (3RW5236-6AC15).
- Main Circuit Voltage: 200–600 V AC (3RW5246/5236 -6AC15).
- Control Voltage (Us): 110–250 V AC/DC.
- Start / Stop Functions: Soft Start (0.5–60 s), Soft Stop, Current Limiting (2–6 × Ie).
- Analog Output: 4–20 mA proportional to motor current (3RW5246-6AC15; also present on -6AC15 variants with “A” designation — confirm suffix).
- Protection: Electronic motor overload (CLASS 10/20/30), phase failure, thyristor overtemp, undervoltage.
- Connections: Screw terminals (power & control).
- Country of Origin: Germany / Austria
Model Comparison Table
Model | Series | Rated Current | Motor Power (@400V) | Main Voltage | Key Features | Typical Use |
|---|---|---|---|---|---|---|
3RW5246-6AC15 | 3RW52 (Compact+) | 171 A | ~90 kW (400V) / ~110 kW (500V) | 200–600 V AC | Soft Start/Stop + Analog Out + Current Limit | Pumps, fans, conveyors (mid-heavy) |
3RW5236-6AC15 | 3RW52 (Compact) | 36 A | ~15 kW / 20 HP | 200–600 V AC | Soft Start/Stop + Current Limit + O/L | Smaller pumps, fans, mixers |
Upgrade Ref. | 3RW5545-2HA14 | 171 A | ~90 kW | 200–480 V AC | Torque Control + Analog Out + Pump Stop | Heavy conv., compressors (torque ctrl needed) |
⚠️ Important Notes:
Technical Specifications (Representative — 3RW5246-6AC15)
Parameter | Specification |
|---|---|
Model / Order Code | 3RW5246-6AC15 (SIRIUS 3RW52) |
Rated Operational Current (Ie) | 171 A (at 40 °C, 3-phase 400V AC) |
Main Circuit Voltage (Ue) | 200–600 V AC (50/60 Hz) |
Control Supply Voltage (Us) | 110–250 V AC/DC (50/60 Hz) |
Motor Power Rating (Typical) | Up to ~90 kW @ 400V AC-3; up to ~110 kW @ 500V |
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 |
Analog Output | 4–20 mA (proportional to motor current, scalable via DIP/parameter) |
Overload Protection | Electronic motor overload (CLASS 10/20/30 selectable) |
By-pass Requirement | External by-pass contactor recommended (NOT included) |
Connection Type | Screw terminals (power & control) |
Mounting | Screw-mount on panel (DIN rail adapter available separately) |
Dimensions (W×H×D) | Approx. 210 mm × 310 mm × 185 mm |
Weight | ~ 8.5 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 type (conveyor = longer ramp; pump = shorter + pump-stop if 3RW55)
- Bypass contactor sizing (3RA2 series) & wiring / link module (3RW5900)
- Analog output scaling & PLC connection (4–20 mA → 0–I_max)
- Fault diagnosis (Fxxx codes: F01 = thyristor overtemp, F02 = motor overload)
- Cross-reference vs. ABB PST / Schneider ATS48 / Allen-Bradley SMC-3 if needed
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 rebuilt clones
- Global supply network with competitive pricing
- Expertise in motor starting solutions (DOL → soft start retrofit, bypass design)
- Comprehensive technical documentation (setting tables, dimensional drawings, wiring diagrams)
- Responsive customer service and support
Applications
- Pumps / Fans / Blowers: Reduce mechanical stress & inrush (water hammer mitigated with 3RW55 Pump Stop; 3RW52 gives soft stop).
- Conveyors / Bulk Material Handling: Smooth acceleration prevents product shift / belt jerk.
- Compressors / Mixers / Crushers (lighter starts): 3RW52 suitable; for high-inertia consider 3RW55 torque control.
- HVAC / Water Treatment Plants: Retrofit DOL starters for gentler motor acceleration.
- General Industry: Any 3-phase motor 7.5–132 kW benefiting from reduced inrush.
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