{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU2146-4MB1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU2146-4MB1","canonicalUrl":"https://aoctrl.com/siemens/3RU2146-4MB1","factsUrl":"https://aoctrl.com/api/mcp/products/3RU2146-4MB1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS thermal overload relay, 3RU2146-4MB1, Size S3, Trip Class 10, 690 V rated, 45 kW at 400 V, screw-type terminals.","salesMarkdown":"## SIRIUS 3RU2146-4MB1 — Thermal Overload Relay, Size S3, Class 10 The Siemens 3RU2146-4MB1 is a SIRIUS-brand thermal overload relay, Size S3, Trip Class 10. Rated for main circuit voltages up to 690 V, the relay handles 45 kW at 400 V (AC-3e duty) and 90 kW at 690 V. The size S3 frame and screw-type terminals accept solid conductors up to 16 mm² and stranded up to 70 mm², suiting it for motor branch circuits in the 30–100 A range. Mount in any position on a flat panel or DIN rail via stand-alone installation. The relay includes a trip-indicator flag and a \"Tripped\" message contact for remote signaling — useful for a PLC or HMI to log the fault without sending someone to the cabinet. ## Current Production — Sourcing This Part Substance prohibitance per RoHS is recorded with a date of 03/01/2017, confirming compliance with the EU RoHS directive. ## Auxiliary Contact Ratings and Wiring The auxiliary contact block carries 2 A at 24 V, 3 A at 120 V, and 0.75 A at 690 V — enough to drive a PLC input or a small contactor coil directly. At 24 VDC the 2 A rating is the limiting case for inductive loads; verify the inrush of the driven device stays under that. Terminals accept solid 2x (0.5–1.5 mm²) or stranded 2x (0.75–2.5 mm²) for the control circuit. Main circuit terminals use M8 bolts with a 4 mm hex socket driver. ## Temperature Compensation and Environmental Range The relay compensates for ambient temperature changes across -40 to +60 °C, maintaining accurate trip timing without manual adjustment. Power dissipation per pole is 7 W at rated current — account for this heat in a densely packed enclosure to avoid derating adjacent devices.","metaTitle":"Siemens 3RU2146-4MB1 SIRIUS Thermal Overload Relay, Size S3,","metaDescription":"Siemens 3RU2146-4MB1 SIRIUS thermal overload relay, Size S3, Trip Class 10, 690 V rated, 45 kW at 400 V. Current production. Available to order. Request quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Overload Relays"],"specifications":{"Note":"for message \"Tripped\"","Depth":"140 mm","Solid":"2x (2.5 ... 16 mm²)","Width":"70 mm","title":"3RU2146-4MB1","Height":"120 mm","at 24 V":"2 A","at 60 V":"0.3 A","Per Pole":"7 W","Stranded":"2x (6 ... 16 mm²), 2x (10 ... 50 mm²), 1x (10 ... 70 mm²)","at 110 V":"0.22 A","at 120 V":"3 A","at 125 V":"0.22 A","at 220 V":"0.11 A","at 230 V":"2 A","at 400 V":"1 A","at 690 V":"0.75 A","Trip Class":"CLASS 10","Rated Value":"690 V","description":"Overload relay 80...100 A Thermal For motor protection Size S3, Class 10 Stand-alone installation Main circuit: Screw Auxiliary circuit: Screw Manual-Automatic-Reset","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-40 ... +70 °C","During Transport":"-55 ... +80 °C","Fastening Method":"stand-alone installation","For Main Contacts":"M8","Mounting Position":"any","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"thermal overload relay","at 400 V rated value":"45 kW","at 480 V rated value":"96 A","at 500 V rated value":"55 kW","at 600 V rated value":"99 A","at 690 V rated value":"90 kW","Size Of Overload Relay":"S3","For Main Current Circuit":"screw-type terminals","Temperature Compensation":"-40 ... +60 °C","Design Of Screwdriver Shaft":"Hexagonal socket","Size Of The Screwdriver Tip":"4 mm hexagon socket","at AC-3e rated value maximum":"1 000 V","Substance Prohibitance (Date)":"03/01/2017","Design Of The Auxiliary Switch":"integrated","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"100 A","at AWG cables for main contacts":"2x (10 ... 1/0), 1x (10 ... 2/0)","For Auxiliary And Control Circuit":"screw-type terminals","Between Main And Auxiliary Circuit":"440 V","Relative Humidity During Operation":"10 ... 95 %","With Type Of Assignment 2 Required":"gG: 200 A","Display Version For Switching Status":"Slide switch","For Main Contacts For Ring Cable Lug":"4.5 ... 6 N·m","Surge Voltage Resistance Rated Value":"8 kV","With Type Of Coordination 1 Required":"gG: 250 A","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","Of The Auxiliary And Control Contacts":"M3","Between Auxiliary And Auxiliary Circuit":"440 V","reference code according to IEC 81346-2":"F","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Number Of Poles For Main Current Circuit":"3","For Main Contacts With Screw-Type Terminals":"4.5 ... 6 N·m","number of CO contacts for auxiliary contacts":"0","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","shock resistance according to IEC 60068-2-27":"8g / 11 ms","For Auxiliary Contacts With Screw-Type Terminals":"0.8 ... 1.2 N·m","operational current at AC-3e at 400 V rated value":"100 A","Size Of Contactor Can Be Combined Company-Specific":"S3","Outer Diameter Of The Usable Ring Cable Lug Maximum":"19 mm","contact rating of auxiliary contacts according to UL":"B600 / R300","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Arrangement Of Electrical Connectors For Main Current Circuit":"Top and bottom","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gG: 6 A, quick: 10 A","insulation voltage with degree of pollution 3 at AC rated value":"1 000 V","Product Component Removable Terminal For Auxiliary And Control Circuit":"No","power loss [W] for rated value of the current at AC in hot operating state":"21 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"80 ... 100 A","Design Of The Miniature Circuit Breaker For Short-Circuit Protection Of The Auxiliary Switch Required":"6A (SCC less than equal to 0.5 kA; U less than equal to 260V)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/8d41060064c0e8fee746835d55cf0ac2.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=630116&mlfb=3RU2146-4MB1"},"ai":{"faq":[{"question":"What does the 'Note for message Tripped' mean on 3RU2146-4MB1?","answer":"The relay provides a dedicated signaling contact that changes state when the overload trips, outputting a 'Tripped' message. This can be wired to a PLC digital input or an HMI alarm annunciator for remote fault indication."},{"question":"What is the depth of 3RU2146-4MB1?","answer":"The depth is 140 mm. Overall dimensions are 70 mm wide by 120 mm tall by 140 mm deep, fitting a standard Size S3 panel footprint."},{"question":"What compliance documentation does Siemens provide for 3RU2146-4MB1?","answer":"The relay carries RoHS compliance with a substance prohibitance date of 03/01/2017. Standard Siemens documentation includes the datasheet, operating instructions, and a CE declaration of conformity. UL and CSA approvals are typical for SIRIUS overload relays but are not explicitly listed in this record."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU2146-4MB1","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/3RU2146-4MB1 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}}