{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4435-6BC45","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4435-6BC45","canonicalUrl":"https://aoctrl.com/siemens/3RW4435-6BC45","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4435-6BC45","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4435-6BC45 soft starter, 232 A at 40 °C, 690 V insulation voltage, 50/60 Hz, thyristor-based, inside-delta capable.","salesMarkdown":"## 232 A at 40 °C — the continuous rating that defines the motor The 3RW4435-6BC45: The derating temperature starts at 40 °C, meaning any enclosure that runs above that ambient must be sized for the lower current or forced-air cooled. The operating frequency is 50/60 Hz — no derating needed when switching between mains frequencies. Pollution degree 3 per IEC 60947-4-2 confirms this is built for industrial environments with conductive dust and humidity, not clean-room or light-commercial installs. ## Thyristor switching and inside-delta wiring Switching is done by thyristors — no mechanical contacts to wear, and the starting current profile is fully programmable. The unit supports inside-delta circuit connection, which reduces the current the soft starter sees to 58% of the line current — a 232 A unit in inside-delta can start a motor with 400 A line current. This is the standard wiring for larger soft starters where the line-side breaker and cabling are the cost driver. Motor overload protection is built in, so no separate overload relay is needed in most installations. The adjustable current limitation lets the user set the starting current peak below the upstream breaker's magnetic trip threshold — useful when the supply transformer is marginal or the line is shared with other loads. Minimum load is 8% — the soft starter can regulate down to very low current levels, which matters for unloaded motor starts or pump soft-stop where the load drops near zero before the stop ramp finishes. ## Panel fit and termination — 270 mm depth, busbar connection Dimensions are 270 mm deep, 170 mm wide, 200 mm tall. The 270 mm depth is the critical cabinet dimension — most 600 mm deep enclosures leave 330 mm for wiring and heat sink clearance behind the door. Main circuit termination is busbar connection, accepting stranded wire 25-120 mm², finely stranded 16-95 mm², and kcmil 4-250. The auxiliary contacts use 2x (20-14) AWG and the solid wire terminals are 2x (0.5-2.5 mm²). For North American installs, the busbar lugs accept 6-2/0 AWG at both front and back clamping points, and up to 2x 1/0 using both points. Clearance requirements: 100 mm above, 75 mm below, 5 mm at the sides. The 5 mm side gap is tight — adjacent units can be mounted nearly touching, but the top and bottom clearance must be respected for heat dissipation from the thyristor heat sink. ## Active production — current lifecycle status Sourced through independent distribution against an RFQ.","metaTitle":"Siemens 3RW4435-6BC45 SIRIUS Soft Starter, 232 A, 690 V","metaDescription":"Siemens 3RW4435-6BC45 SIRIUS soft starter, 232 A at 40 °C, 690 V insulation voltage. In current production. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"270mm","Solid":"2x (0.5 ... 2.5 mm²)","Width":"170mm","title":"3RW4435-6BC45","Height":"200mm","Upwards":"100mm","Stranded":"25 ... 120 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 500 V, 40 °C standard: 134 A, 90 kW Inside-delta: 232 A, 160 kW 400-600 V AC, 230 V AC Screw terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5535-6HA16<<","During Storage":"-25 ... +80°C","External Reset":"Yes","Finely Stranded":"16 ... 95 mm²","lifecycle_stage":"current","During Operation":"60°C","Fastening Method":"screw fixing","Minimum Load [%]":"8%","For Main Contacts":"4 ... 250 kcmil","Mounting Position":"with vertical mounting surface +/-90° rotatable, with vertical mounting surface +/- 22.5° tiltable to the front and back","Product Brand Name":"SIRIUS","Degree Of Pollution":"3, acc. to IEC 60947-4-2","Product Designation":"Soft starter","Wire Length Maximum":"500m","Derating Temperature":"40°C","Inside-Delta Circuit":"Yes","at 50 Hz rated value":"230V","at 60 Hz rated value":"230V","at 40 °C rated value":"232A","at 50 °C rated value":"203A","at 60 °C rated value":"173A","For Auxiliary Contacts":"2x (20 ... 14)","For Main Current Circuit":"busbar connection","Motor Overload Protection":"Yes","Using Both Clamping Points":"max. 2x 1/0","Intrinsic Device Protection":"Yes","Adjustable Current Limitation":"Yes","Using The Back Clamping Point":"6 ... 2/0","Insulation Voltage Rated Value":"690V","Using The Front Clamping Point":"6 ... 2/0","Operating Frequency Rated Value":"50 ... 60Hz","Display Version For Fault Signal":"Display","Integrated Bypass Contact System":"Yes","For Auxiliary And Control Circuit":"screw-type terminals","Product Component Motor Brake Output":"Yes","during storage according to IEC 60721":"1K6 (only occasional condensation), 1C2 (no salt mist), 1S2 (sand must not get inside the devices), 1M4","reference code according to EN 61346-2":"Q","during operation according to IEC 60721":"3K6 (no formation of ice, no condensation), 3C3 (no salt mist), 3S2 (sand must not get into the devices), 3M6","during transport according to IEC 60721":"2K2, 2C1, 2S1, 2M2 (max. fall height 0.3 m)","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Evaluation Of Thermistor Motor Protection":"Yes","at standard circuit at 40 °C rated value":"90kW","at standard circuit at 50 °C rated value":"100hp","Finely Stranded Without Core End Processing":"max. 1x 50 mm², 1x 70 mm²","number of CO contacts for auxiliary contacts":"1","number of NC contacts for auxiliary contacts":"0","number of NO contacts for auxiliary contacts":"3","Type Of Voltage Of The Control Supply Voltage":"AC","at inside-delta circuit at 40 °C rated value":"160kW","at inside-delta circuit at 50 °C rated value":"200hp","Control Supply Voltage Frequency 1 Rated Value":"50Hz","Control Supply Voltage Frequency 2 Rated Value":"60Hz","Installation Altitude At Height Above Sea Level":"5 000m","continuous operating current [% of Ie] at 40 °C":"115%","Operating Voltage At Standard Circuit Rated Value":"400 ... 600V","contact rating of auxiliary contacts according to UL":"B300 / R300","Operating Voltage At Inside-Delta Circuit Rated Value":"400 ... 600V","Relative Negative Tolerance Of The Operating Frequency":"-10%","Relative Positive Tolerance Of The Operating Frequency":"10%","For Auxiliary Contacts Finely Stranded With Core End Processing":"2x (20 ... 16)","Relative Negative Tolerance Of The Control Supply Voltage Frequency":"-10%","Relative Positive Tolerance Of The Control Supply Voltage Frequency":"10%","Relative Negative Tolerance Of The Operating Voltage At Standard Circuit":"-15%","Relative Positive Tolerance Of The Operating Voltage At Standard Circuit":"10%","power loss [W] at operational current at 40 °C during operation typical":"76W","relative negative tolerance of the control supply voltage at AC at 50 Hz":"-15%","relative negative tolerance of the control supply voltage at AC at 60 Hz":"-15%","relative positive tolerance of the control supply voltage at AC at 50 Hz":"10%","relative positive tolerance of the control supply voltage at AC at 60 Hz":"10%","Adjustable Motor Current For Motor Overload Protection Minimum Rated Value":"26A","Relative Negative Tolerance Of The Operating Voltage At Inside-Delta Circuit":"-15%","Relative Positive Tolerance Of The Operating Voltage At Inside-Delta Circuit":"10%"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/45d46bc8d9e998c883f65fab49e5a221.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=34231&mlfb=3RW4435-6BC45"},"ai":{"faq":[{"question":"What is the maximum motor wire length for the 3RW4435-6BC45?","answer":"The maximum wire length from the soft starter to the motor is 500 m. Beyond that, voltage drop and reflected wave effects on the motor terminals become a concern, especially with the thyristor switching edges."},{"question":"What compliance documentation does Siemens provide for 3RW4435-6BC45?","answer":"The part carries pollution degree 3 per IEC 60947-4-2, which implies compliance with the IEC 60947 series for low-voltage switchgear. Siemens typically provides CE, UKCA, and UL/CSA declarations for SIRIUS soft starters — confirm the specific certificate number with the factory documentation package at order time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4435-6BC45","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/3RW4435-6BC45 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}