{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RW4436-2BC34","brand":"Siemens","brandSlug":"siemens","productSlug":"3RW4436-2BC34","canonicalUrl":"https://aoctrl.com/siemens/3RW4436-2BC34","factsUrl":"https://aoctrl.com/api/mcp/products/3RW4436-2BC34","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RW4436-2BC34 soft starter, 281 A at 40 °C, 690 V insulation voltage, 50/60 Hz, inside-delta circuit, screw fixing, 170 x 200 x 270 mm.","salesMarkdown":"## Rated current and thermal derating — what the numbers mean for your motor The 3RW4436-2BC34: The soft starter is rated 281 A at 40 °C ambient. This is the full-load current it can handle continuously at that temperature. The derating temperature threshold is 40 °C — above that, you must reduce the load current or improve cabinet ventilation to stay within the device's thermal limits. The insulation voltage is rated 690 V, and the operating frequency covers 50 to 60 Hz. Inside-delta circuit configuration is supported, which reduces the current through the soft starter to 58% of the motor full-load current — useful for larger motors where the starter frame size can be downsized. Adjustable current limitation and motor overload protection are built in, along with intrinsic device protection (thyristor overtemperature, phase imbalance). ## Mounting, wiring, and panel integration Dimensions are 170 mm wide, 200 mm high, 270 mm deep. Fastening is by screw fixing to a vertical mounting surface, rotatable ±90° and tiltable ±22.5° front-to-back. This gives flexibility in cabinet layout — the unit can be mounted on a backplate or sidewall without special brackets. Main circuit connections accept stranded wire 25–120 mm² or busbar connection. Auxiliary control wiring uses solid wire 0.25–1.5 mm² (2x terminals). The main terminals also accept AWG 4–250 kcmil. Maximum motor cable length is 500 m — sufficient for most industrial installations without output reactors. Degree of pollution is 3 per IEC 60947-4-2, meaning the device is suitable for industrial environments with conductive pollution or dry non-conductive pollution that becomes conductive due to condensation. Clearance distances: 100 mm upwards, 75 mm downwards, 5 mm at the sides. ## Protection and diagnostics The soft starter includes a display for fault signals, showing the fault type directly on the unit — no need for a separate HMI or software to read error codes. External reset input allows remote fault clearing from a PLC or pushbutton panel. Minimum load is 8% of the rated current — the device can start very lightly loaded motors without instability. Storage temperature range is -25 to +80 °C, operating ambient up to 60 °C.","metaTitle":"Siemens 3RW4436-2BC34 SIRIUS Soft Starter, 281 A, 690 V","metaDescription":"Siemens 3RW4436-2BC34 SIRIUS soft starter, rated 281 A at 40 °C, 690 V insulation voltage. Active production, quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Soft Starters"],"specifications":{"Depth":"270mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"170mm","title":"3RW4436-2BC34","Height":"200mm","Upwards":"100mm","Stranded":"25 ... 120 mm²","Downwards":"75mm","Thyristors":"Yes","At The Side":"5mm","description":"SIRIUS soft starter Values at 460 V, 50 °C standard: 145 A, 100 hp Inside-delta: 251 A, 200 hp 200-460 V AC, 115 V AC spring-type terminals!!! Phased-out product!!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5536-2HA14<<","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":"115V","at 60 Hz rated value":"115V","at 40 °C rated value":"281A","at 50 °C rated value":"251A","at 60 °C rated value":"217A","For Auxiliary Contacts":"2x (24 ... 16)","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","during storage acc. to IEC 60721":"1K6 (only occasional condensation), 1C2 (no salt mist), 1S2 (sand must not get inside the devices), 1M4","For Auxiliary And Control Circuit":"spring-loaded terminals","during operation acc. 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 acc. to IEC 60721":"2K2, 2C1, 2S1, 2M2 (max. fall height 0.3 m)","Product Component Motor Brake Output":"Yes","reference code acc. to DIN EN 61346-2":"Q","Finely Stranded With Core End Processing":"2x (0.25 ... 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","touch protection on the front acc. to IEC 60529":"finger-safe, for vertical contact from the front with box terminal/cover","continuous operating current [% of Ie] at 40 °C":"115%","Operating Voltage At Standard Circuit Rated Value":"200 ... 460V","protection class IP on the front acc. to IEC 60529":"IP00; IP20 with box terminal/cover","contact rating of auxiliary contacts according to UL":"B300 / R300","Operating Voltage At Inside-Delta Circuit Rated Value":"200 ... 460V","Relative Negative Tolerance Of The Operating Frequency":"-10%","Relative Positive Tolerance Of The Operating Frequency":"10%","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":"95W","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":"32A","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/e09ce00553012a78c84744bad0e36682.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=32252&mlfb=3RW4436-2BC34"},"ai":{"faq":[{"question":"What is the rated current of 3RW4436-2BC34 at different temperatures?","answer":"At 40 °C the continuous rated current is 281 A. The derating temperature threshold is 40 °C."},{"question":"Does 3RW4436-2BC34 support inside-delta connection?","answer":"Yes, inside-delta circuit configuration is supported. This allows the soft starter to handle motor full-load current at 58% of the line current, enabling a smaller starter frame size for a given motor."},{"question":"What compliance documentation does Siemens provide for 3RW4436-2BC34?","answer":"The device is designed to IEC 60947-4-2 (degree of pollution 3). Standard Siemens documentation includes the datasheet, operating instructions, and CE declaration of conformity. Specific RoHS/REACH status should be confirmed from the manufacturer's current compliance declarations."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RW4436-2BC34","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/3RW4436-2BC34 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}}