Siemens Soft Starter Classification-1

1

3RW2122-1BG01, 3RW2124-1BG01, 3RW2125-1BG01

Housing: Flame-retardant polycarbonate (PC) with V0 fire rating; Internal contacts: Silver-nickel alloy for high conductivity and wear resistance; Insulation material: Epoxy resin with excellent electrical insulation performance

1. Contact ablation due to long-term overload operation beyond rated current; 2. Internal component overheating caused by poor ventilation and dust accumulation; 3. Control circuit damage from power grid voltage fluctuations exceeding ±10%

1. Regularly monitor load current to ensure it does not exceed the starter's rated value; 2. Reserve at least 5cm of ventilation space around the installation and clean dust monthly; 3. Install a voltage stabilizer in areas with unstable power grids

1

3RW2221-1AB15, 3RW2223-1AB15, 3RW2225-1AB15, 3RW2226-1AB15, 3RW2227-1AB15, 3RW2228-1AB15, 3RW2230-1AB15, 3RW2231-1AB15, 3RW2234-0DB15, 3RW2235-0DB15, 3RW2236-0DB15, 3RW2236-0DB16, 3RW2236-0DB18, 3RW2238-0DB15, 3RW2238-0DB16, 3RW2240-0DB15, 3RW2240-0DB16, 3RW2240-0DB18, 3RW2241-0DB15

Housing: Die-cast aluminum alloy with anti-corrosion coating; Power module substrate: High thermal conductivity ceramic; Sealing ring: Nitrile rubber (NBR) to achieve IP54 protection level

1. Internal component corrosion from high humidity and corrosive gases; 2. Loose wiring and poor contact due to mechanical vibration; 3. Power module overheating caused by blocked heat sinks

1. Install waterproof and dustproof enclosures for outdoor or humid environment use; 2. Check wiring terminal tightness monthly and use lock washers; 3. Clean heat sink fins quarterly with compressed air to remove oil and dust

1

3RW2920-1BC06, 3RW2920-4AC00, 3RW2920-4AD00, 3RW2920-6KC00, 3RW2920-6KD00, 3RW2920-6KE00, 3RW2920-6KH00, 3RW2920-6LC00, 3RW2920-6LD00, 3RW2920-6LE00, 3RW2920-6LH00, 3RW2920-6MC00, 3RW2920-6ME00

Housing: ABS engineering plastic with flame retardancy; Internal connectors: Tin-plated brass to prevent oxidation; Conductive parts: High-conductivity copper alloy

1. Connector pin oxidation leading to poor contact; 2. Internal component overload due to incorrect matching with main starters; 3. Static electricity damage during installation and maintenance

1. Apply anti-oxidation paste to connector pins during installation; 2. Verify model compatibility with the main starter per Siemens Technical Manual No. 6SL3210-1PE21-8UL0; 3. Wear anti-static gloves and ground the equipment before maintenance

1

3RW3003-1CB54, 3RW3003-2CB54, 3RW3014-1CB04, 3RW3014-1CB14, 3RW3016-1CB04, 3RW3016-1CB14, 3RW3024-1AB04, 3RW3024-1AB05, 3RW3024-1AB14, 3RW3024-1AB15, 3RW3025-1AB04, 3RW3025-1AB05, 3RW3025-1AB14, 3RW3025-1AB15

Housing: Flame-retardant PC/ABS alloy; Thermal overload protector: Copper-nickel alloy bimetallic strip; Insulation layer: High-temperature resistant silicone rubber

1. Component damage from incorrect parameter settings mismatched with motor specifications; 2. Bimetallic strip fatigue due to frequent startup; 3. Heat dissipation inefficiency caused by dust accumulation

1. Set parameters strictly according to the motor nameplate and follow the 3RW30 Series Operation Manual; 2. Ensure a startup interval of at least 3 minutes for motors above 15kW; 3. Install dust covers in dusty environments and clean monthly

2

3RW3026-1AA12, 3RW3026-1AB04, 3RW3026-1AB05, 3RW3026-1AB14, 3RW3026-1AB15, 3RW3034-1AB04, 3RW3034-1AB05, 3RW3034-1AB14, 3RW3034-1AB15, 3RW3035-1AA12, 3RW3035-1AB04, 3RW3035-1AB05, 3RW3035-1AB14, 3RW3035-1AB15

Housing: Flame-retardant PC/ABS alloy; Thermal overload protector: Copper-nickel alloy bimetallic strip; Insulation layer: High-temperature resistant silicone rubber

1. Phase failure protection activation and component damage from three-phase voltage imbalance; 2. Loose internal components due to installation platform vibration; 3. Overheating in closed cabinets with poor ventilation

1. Regularly check three-phase voltage balance (imbalance rate ≤2%); 2. Install shock-absorbing pads between the starter and the mounting surface; 3. Equip closed cabinets with ventilation fans and keep ambient temperature below 40℃

3

3RW3036-1AB04, 3RW3036-1AB05, 3RW3036-1AB14, 3RW3036-1AB15, 3RW3044-1AB04, 3RW3044-1AB05, 3RW3044-1AB14, 3RW3044-1AB15, 3RW3045-1AA12, 3RW3045-1AB04, 3RW3045-1AB05, 3RW3045-1AB14, 3RW3045-1AB15, 3RW3046-1AB04, 3RW3046-1AB05, 3RW3046-1AB14, 3RW3046-1AB15

Housing: Flame-retardant PC/ABS alloy; Thermal overload protector: Copper-nickel alloy bimetallic strip; Insulation layer: High-temperature resistant silicone rubber

1. Internal circuit short circuits from moisture intrusion; 2. Thermal protector failure due to long-term overload exceeding thermal capacity; 3. Local overheating from loose wiring terminals

1. Maintain ambient humidity between 45%-85% RH and avoid direct water contact; 2. Install current monitoring devices to detect overloads in real time; 3. Tighten terminals with a torque wrench (2.5-3N·m) and recheck quarterly

1

3RW3124-1CB14, 3RW3124-1CB15, 3RW3125-1CB14, 3RW3125-1CB15, 3RW3126-1CB14, 3RW3126-1CB15

Housing: Anodized die-cast aluminum alloy; Internal power thyristor: High-power silicon carbide (SiC) for high temperature and voltage resistance; Heat sink: Integrally forged aluminum alloy for efficient heat dissipation

1. Thyristor overheating from long-time heavy-load startup; 2. Thyristor breakdown due to voltage fluctuations during startup; 3. Internal component connection loosening from heavy-load equipment vibration

1. Limit heavy-load startup time to ≤60 seconds and set current limiting to 3-4 times rated current; 2. Install voltage stabilizers and reactors at the input end; 3. Use shock-absorbing mounting brackets and check fasteners monthly

1

3RW3452-0DC34, 3RW3452-0DC35, 3RW3454-0DC24, 3RW3454-0DC25, 3RW3454-0DC34, 3RW3454-0DC35, 3RW3454-0DC44, 3RW3454-0DC45, 3RW3455-0DC24, 3RW3455-0DC25, 3RW3455-0DC34, 3RW3455-0DC35, 3RW3455-0DC44, 3RW3455-0DC45

Housing: Flame-retardant PC with IP55 protection; Circuit board: FR-4 epoxy resin board with anti-corrosion coating; Communication module: Gold-plated pins for stable signal transmission; Display: Industrial anti-glare LCD

1. Communication failures from electromagnetic interference (EMI); 2. Circuit board damage from static electricity during maintenance; 3. Display screen damage from mechanical collision

1. Use shielded cables for communication wiring and ground the shield at one end; 2. Wear anti-static wristbands during maintenance and avoid direct contact with circuit boards; 3. Install protective covers around the display in high-traffic areas

2

3RW3457-0DC24, 3RW3457-0DC25, 3RW3457-0DC44, 3RW3457-0DC45, 3RW3458-0DC24, 3RW3458-0DC25, 3RW3458-0DC34, 3RW3458-0DC35, 3RW3458-0DC44, 3RW3458-0DC45, 3RW3465-0DC24, 3RW3465-0DC25, 3RW3465-0DC34, 3RW3465-0DC35, 3RW3465-0DC44, 3RW3465-0DC45

Housing: Flame-retardant PC with IP55 protection; Circuit board: FR-4 epoxy resin board with anti-corrosion coating; Communication module: Gold-plated pins for stable signal transmission; Display: Industrial anti-glare LCD

1. Circuit board short circuits from dust accumulation; 2. Control circuit overload from incorrect peripheral device matching; 3. Communication interface damage from hot-plugging

1. Clean circuit boards with compressed air every six months (power off first); 2. Verify peripheral load capacity before connection; 3. Prohibit hot-plugging communication cables and power off first

3

3RW3466-0DC24, 3RW3466-0DC25, 3RW3466-0DC34, 3RW3466-0DC35, 3RW3466-0DC44, 3RW3466-0DC45, 3RW3467-0DC24, 3RW3467-0DC25, 3RW3467-0DC34, 3RW3467-0DC35, 3RW3467-0DC44, 3RW3467-0DC45, 3RW3468-0DC24, 3RW3468-0DC25, 3RW3468-0DC34, 3RW3468-0DC35, 3RW3468-0DC44, 3RW3468-0DC45

Housing: Flame-retardant PC with IP55 protection; Circuit board: FR-4 epoxy resin board with anti-corrosion coating; Communication module: Gold-plated pins for stable signal transmission; Display: Industrial anti-glare LCD

1. Electronic component aging from high ambient temperatures; 2. Circuit board solder joint loosening from vibration; 3. Power module damage from lightning-induced voltage surges

1. Install cooling equipment in high-temperature environments (ambient temperature ≤45℃); 2. Inspect solder joints annually and re-solder if loose; 3. Install lightning protectors at the power input and ensure reliable grounding

4

3RW3472-0DC24, 3RW3472-0DC35, 3RW3472-0DC44, 3RW3483-0DC24, 3RW3483-0DC25, 3RW3483-0DC34, 3RW3483-0DC35, 3RW3483-0DC44, 3RW3483-0DC45, 3RW3484-0DC24, 3RW3484-0DC25, 3RW3484-0DC34, 3RW3484-0DC35, 3RW3484-0DC44, 3RW3484-0DC45, 3RW3486-0DC44, 3RW3486-0DC45

Housing: Flame-retardant PC with IP55 protection; Circuit board: FR-4 epoxy resin board with anti-corrosion coating; Communication module: Gold-plated pins for stable signal transmission; Display: Industrial anti-glare LCD

1. Component corrosion from corrosive gases; 2. Abnormal operation from incorrect parameter settings; 3. Local overheating from poor power terminal contact

1. Install anti-corrosion enclosures in corrosive environments; 2. Back up parameters regularly to avoid loss from misoperation; 3. Check terminal temperatures with an infrared thermometer monthly and re-tighten if overheated

1

3RW3926-8A, 3RW3936-8A, 3RW3950-6DC28, 3RW3950-6DC38, 3RW3950-6DC48, 3RW3950-8DC28, 3RW3950-8DC48, 3RW3960-8DC28, 3RW3960-8DC48, 3RW3970-8DC28, 3RW3972-8DC28, 3RW3973-8DC28, 3RW3986-5DC85

Housing: 304 stainless steel for corrosion resistance; Internal sensor: Precision resistance strain gauge; Circuit board: FR-4 epoxy resin board with waterproof coating; Display: Long-life LED

1. Sensor drift from temperature changes; 2. Waterproof coating damage leading to moisture intrusion; 3. LED burnout from overvoltage; 4. Electromagnetic interference causing circuit board damage

1. Calibrate sensors annually for temperature compensation per IEC 60751; 2. Inspect waterproof coatings regularly and reapply if cracked; 3. Install voltage limiters at the power input; 4. Ground the housing reliably to reduce EMI

1

3RW4055-2BB34, 3RW4055-2BB35, 3RW4055-2BB44, 3RW4055-2BB45, 3RW4055-6BB34, 3RW4055-6BB35, 3RW4055-6BB44, 3RW4055-6BB45

Housing: High-voltage resistant epoxy resin insulation; Internal thyristor: Porcelain-sealed high-voltage thyristor; Insulation oil: Transformer oil complying with GB 2536-2011 standard

1. Insulation breakdown from partial discharge; 2. Thyristor damage from power grid overvoltage; 3. Insulation oil deterioration from long-term use

1. Regularly test partial discharge (PD) values (≤50pC); 2. Install zinc oxide surge arresters at the high-voltage input; 3. Replace insulation oil every 2 years and test dielectric strength (≥45kV/2.5mm)

1

3RW4422-1BC34, 3RW4422-1BC35, 3RW4422-1BC36, 3RW4422-1BC44, 3RW4422-1BC45, 3RW4422-1BC46, 3RW4422-3BC34, 3RW4422-3BC35, 3RW4422-3BC36, 3RW4422-3BC44, 3RW4422-3BC45, 3RW4422-3BC46

Housing: Die-cast aluminum alloy with anti-corrosion coating; Power contacts: Silver-tungsten alloy for high temperature and arc resistance; Heat sink: Ribbed aluminum alloy for efficient heat dissipation

1. Contact ablation from frequent heavy-load startup; 2. Overheating from blocked heat sinks; 3. Housing corrosion in high-humidity, dusty environments

1. Ensure a startup interval of ≥5 minutes for heavy loads; 2. Clean heat sinks monthly with brushes or compressed air; 3. Install dustproof and waterproof covers and inspect anti-corrosion coatings quarterly

2

3RW4423-1BC34, 3RW4423-1BC35, 3RW4423-1BC36, 3RW4423-1BC44, 3RW4423-1BC45, 3RW4423-1BC46, 3RW4423-3BC34, 3RW4423-3BC35, 3RW4423-3BC36, 3RW4423-3BC44, 3RW4423-3BC45, 3RW4423-3BC46

Housing: Die-cast aluminum alloy with anti-corrosion coating; Power contacts: Silver-tungsten alloy for high temperature and arc resistance; Heat sink: Ribbed aluminum alloy for efficient heat dissipation

1. Phase failure damage from three-phase current imbalance; 2. Internal wiring loosening from vibration; 3. Control circuit damage from voltage fluctuations

1. Install three-phase current monitors (alarm when imbalance rate >3%); 2. Secure internal wiring with cable ties and inspect quarterly; 3. Install voltage stabilizers in unstable power grids

3

3RW4425-3BC36, 3RW4434-2BC34, 3RW4434-2BC35, 3RW4434-2BC36, 3RW4434-2BC44, 3RW4434-2BC45, 3RW4434-2BC46, 3RW4434-6BC34, 3RW4434-6BC35, 3RW4434-6BC36, 3RW4434-6BC44, 3RW4434-6BC45, 3RW4434-6BC46

Housing: Die-cast aluminum alloy with anti-corrosion coating; Power contacts: Silver-tungsten alloy for high temperature and arc resistance; Heat sink: Ribbed aluminum alloy for efficient heat dissipation

1. Thyristor damage from harmonic interference; 2. Circuit board solder joint loosening from vibration; 3. Overheating in closed, poorly ventilated environments

1. Install active harmonic filters in harmonic-prone power grids; 2. Inspect solder joints annually and re-solder if loose; 3. Equip closed cabinets with ventilation fans (airflow rate ≥0.5m/s)

4

3RW4436-2BC36, 3RW4443-2BC34, 3RW4443-2BC35, 3RW4443-2BC36, 3RW4443-2BC44, 3RW4443-2BC45, 3RW4443-2BC46, 3RW4443-6BC34, 3RW4443-6BC35, 3RW4443-6BC36, 3RW4443-6BC44, 3RW4443-6BC45, 3RW4443-6BC46

Housing: Die-cast aluminum alloy with anti-corrosion coating; Power contacts: Silver-tungsten alloy for high temperature and arc resistance; Heat sink: Ribbed aluminum alloy for efficient heat dissipation

1. Arc-induced contact adhesion during startup; 2. Heat dissipation inefficiency from oil mist and dust on heat sinks; 3. Control failure from poor communication interface contact

1. Install arc suppressors to reduce arc impact; 2. Clean heat sinks with degreasers in oil mist environments; 3. Inspect communication interfaces quarterly and clean pins with alcohol

5

3RW4444-2BC34, 3RW4444-2BC35, 3RW4444-2BC36, 3RW4444-2BC44, 3RW4444-2BC45, 3RW4444-2BC46, 3RW4444-6BC34, 3RW4444-6BC35, 3RW4444-6BC36, 3RW4444-6BC44, 3RW4444-6BC45, 3RW4444-6BC46

Housing: Die-cast aluminum alloy with anti-corrosion coating; Power contacts: Silver-tungsten alloy for high temperature and arc resistance; Heat sink: Ribbed aluminum alloy for efficient heat dissipation

1. Power module damage from power surges; 2. Capacitor degradation leading to startup failures; 3. Insulation material aging from high ambient temperatures

1. Install surge protectors at the power input; 2. Test capacitor capacitance annually (replace if deviation >10%); 3. Avoid installation near heat sources and ensure good ventilation

6

3RW4445-2BC34, 3RW4445-2BC35, 3RW4445-2BC36, 3RW4445-2BC44, 3RW4445-2BC45, 3RW4445-2BC46, 3RW4445-6BC34, 3RW4445-6BC35, 3RW4445-6BC36, 3RW4445-6BC44, 3RW4445-6BC45, 3RW4445-6BC46

Housing: Die-cast aluminum alloy with anti-corrosion coating; Power contacts: Silver-tungsten alloy for high temperature and arc resistance; Heat sink: Ribbed aluminum alloy for efficient heat dissipation

1. Thermal protector failure from abnormal temperature rises; 2. Local overheating from loose terminals; 3. Electromagnetic interference damaging control circuits

1. Test thermal protector performance annually; 2. Tighten terminals with a torque wrench (3-4N·m); 3. Use shielded control cables and ground the shield

7

3RW4446-2BC36, 3RW4447-2BC34, 3RW4447-2BC35, 3RW4447-2BC36, 3RW4447-2BC44, 3RW4447-2BC45, 3RW4447-2BC46, 3RW4447-6BC34, 3RW4447-6BC35, 3RW4447-6BC36, 3RW4447-6BC44, 3RW4447-6BC45, 3RW4447-6BC46

Housing: Die-cast aluminum alloy with anti-corrosion coating; Power contacts: Silver-tungsten alloy for high temperature and arc resistance; Heat sink: Ribbed aluminum alloy for efficient heat dissipation

1. Moisture-induced internal short circuits; 2. Long-term overload exceeding thermal capacity; 3. Poor contact from dust on contact surfaces

1. Maintain ambient humidity ≤80% RH and install dehumidifiers if needed; 2. Limit overload time (≤15 minutes for 1.2x rated load); 3. Clean contact surfaces with fine sandpaper (power off first)

8

3RW4453-2BC34, 3RW4453-2BC35, 3RW4453-2BC36, 3RW4453-2BC44, 3RW4453-2BC45, 3RW4453-2BC46, 3RW4453-6BC34, 3RW4453-6BC35, 3RW4453-6BC36, 3RW4453-6BC44, 3RW4453-6BC45, 3RW4453-6BC46

Housing: Die-cast aluminum alloy with anti-corrosion coating; Power contacts: Silver-tungsten alloy for high temperature and arc resistance; Heat sink: Ribbed aluminum alloy for efficient heat dissipation

1. Corrosion from corrosive gases in chemical environments; 2. Wiring errors leading to short circuits; 3. Insulation degradation from long-term use

1. Use anti-corrosion enclosures in chemical environments; 2. Verify wiring against diagrams and test insulation resistance (≥1MΩ) before power-on; 3. Inspect insulation layers annually and replace if aging is found

9

3RW4455-2BC36, 3RW4456-2BC34, 3RW4456-2BC35, 3RW4456-2BC36, 3RW4456-2BC44, 3RW4456-2BC45, 3RW4456-2BC46, 3RW4456-6BC34, 3RW4456-6BC35, 3RW4456-6BC36, 3RW4456-6BC44, 3RW4456-6BC45, 3RW4456-6BC46

Housing: Die-cast aluminum alloy with anti-corrosion coating; Power contacts: Silver-tungsten alloy for high temperature and arc resistance; Heat sink: Ribbed aluminum alloy for efficient heat dissipation

1. Lightning-induced voltage surges damaging components; 2. Thyristor aging from long-term use; 3. Secondary circuit poor contact leading to monitoring failures

1. Install lightning protectors at the power incoming line; 2. Test thyristor on-state voltage drop annually and replace if exceeding standards; 3. Tighten secondary circuit terminals and apply anti-oxidation paste

10

3RW4457-2BC34, 3RW4457-2BC35, 3RW4457-2BC36, 3RW4457-2BC44, 3RW4457-2BC45, 3RW4457-2BC46, 3RW4457-6BC34, 3RW4457-6BC35, 3RW4457-6BC36, 3RW4457-6BC44, 3RW4457-6BC45, 3RW4457-6BC46, 3RW4465-2BC36, 3RW4465-2BC46, 3RW4465-6BC36

Housing: Die-cast aluminum alloy with anti-corrosion coating; Power contacts: Silver-tungsten alloy for high temperature and arc resistance; Heat sink: Ribbed aluminum alloy for efficient heat dissipation

1. Overheating from insufficient ventilation in high-temperature environments; 2. Vibration-induced internal component damage; 3. Dust accumulation causing partial discharge

1. Install forced cooling systems in high-temperature areas; 2. Use shock-absorbing mounting brackets; 3. Clean internal components and heat sinks every six months with compressed air

How to select the appropriate Siemens soft starter model for my motor?

First, confirm the motor's rated power, rated voltage, and load type (light/medium/heavy load). Match the soft starter's rated current with the motor's rated current (preferably 1.1-1.2 times the motor's rated current). For heavy-load equipment like crushers, select the 3RW44 series with strong overload capacity; for small fans/pumps, the 3RW21 series is cost-effective. Refer to Siemens' official selection guide or consult technical support for complex applications.

What are the key inspection items for Siemens soft starters during routine maintenance?

Key inspection items include: 1. Checking wiring terminal tightness and for signs of overheating (discoloration); 2. Cleaning heat sinks, fans, and dust covers to ensure heat dissipation; 3. Testing three-phase voltage/current balance; 4. Verifying parameter settings and backing up parameters; 5. Inspecting insulation layers and sealing rings for aging/damage; 6. Testing protection functions (overload, phase failure) to ensure they work properly.