{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB3123-4VE0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB3123-4VE0","canonicalUrl":"https://aoctrl.com/siemens/3RB3123-4VE0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB3123-4VE0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3RB3123-4VE0, size S0, 40 A thermal current, adjustable trip class 5E/10E/20E/30E, spring-loaded terminals, contactor mounting.","salesMarkdown":"## Mounting and integration into a motor starter Size S0 is the standard Siemens frame for contactors up to about 40 A motor full-load current. The 3RB3123-4VE0 fastens directly to the contactor via the contactor mounting method — no bracket or adapter plate. Panel space is 45 mm wide by 109 mm tall by 85 mm deep. Spring-loaded terminals on the main current circuit accept solid or stranded wire: 2x (0.25 to 1.5 mm²) for the control/signaling circuit, and up to 1x 10 mm² stranded for the power circuit. The screwdriver spec is PZ2 with a shaft diameter of 5 to 6 mm. Vibration resistance is tested to 1-6 Hz at 15 mm amplitude and 6-500 Hz at 20 m/s² for 10 cycles; shock resistance is 15g / 11 ms. ## Environmental and operating conditions Storage and transport range is -40 to +80 °C. Power dissipation per pole is 1.5 W at rated thermal current. The signaling contact ratings vary by voltage: 4 A at 120 V AC, 3 A at 230 V AC, and 2 A at 24 V DC.","metaTitle":"Siemens 3RB3123-4VE0 SIRIUS solid-state overload relay, 40 A","metaDescription":"Siemens 3RB3123-4VE0 SIRIUS solid-state overload relay, 40 A thermal current, adjustable trip classes 5E-30E, contactor-mount S0 size. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Overload Relays"],"specifications":{"Note":"for message \"tripped\"","Depth":"85 mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"45 mm","title":"3RB3123-4VE0","Height":"109 mm","Maximum":"IMotor < upper current setting value x 3.5","Minimum":"IMotor > lower current setting value","at 24 V":"2 A","at 60 V":"0.55 A","Per Pole":"1.5 W","Stranded":"1x 10 mm²","at 110 V":"0.3 A","at 120 V":"4 A","at 125 V":"0.3 A","at 220 V":"0.11 A","at 230 V":"3 A","Trip Class":"CLASS 5E, 10E, 20E and 30E adjustable","Rated Value":"690 V","description":"Overload relay 10...40 A Electronic For motor protection Size S0, Class 5...30 Contactor mounting Main circuit: Spring-type terminal Auxiliary circuit: Spring-type terminal Manual-Automatic-Reset Internal ground fault detection","During Storage":"-40 ... +80 °C","Thermal Current":"40 A","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +80 °C","Fastening Method":"Contactor mounting","Shock Resistance":"15g / 11 ms","For Main Contacts":"M4","Mounting Position":"any","Solid Or Stranded":"2x (0,25 ... 1,5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"solid-state overload relay","Vibration Resistance":"1-6 Hz, 15 mm; 6-500 Hz, 20 m/s²; 10 cycles","at 480 V rated value":"40 A","at 600 V rated value":"40 A","Size Of Overload Relay":"S0","For Main Current Circuit":"spring-loaded terminals","Temperature Compensation":"-25 ... +60 °C","Design Of Screwdriver Shaft":"Diameter 5 to 6 mm","Size Of The Screwdriver Tip":"Pozidriv PZ 2","according to IEC 60068-2-27":"15g / 11 ms; Signaling contact 97 / 98 in position \"Tripped\": 9g / 11 ms","at AC-3e rated value maximum":"690 V","Substance Prohibitance (Date)":"10/01/2009","Design Of The Auxiliary Switch":"integrated","Design Of The Overload Release":"electronic","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"40 A","for AC motors at 500 V at 50 Hz":"7.5 ... 22 kW","for AC motors at 690 V at 50 Hz":"11 ... 37 kW","for remote-reset function at DC":"24 V","For Auxiliary And Control Circuit":"spring-loaded terminals","Between Main And Auxiliary Circuit":"690 V","Relative Humidity During Operation":"10 ... 95 %","With Type Of Assignment 2 Required":"gG: 80 A, J: 100 A","Display Version For Switching Status":"Slide switch","Surge Voltage Resistance Rated Value":"6 kV","With Type Of Coordination 1 Required":"gG: 125 A, J: 150 A","at AWG cables for auxiliary contacts":"1x (24 ... 16), 2x (24 ... 16)","for 3-phase motors at 400 V at 50 Hz":"5.5 ... 18.5 kW","Between Auxiliary And Auxiliary Circuit":"300 V","due to burst according to IEC 61000-4-4":"2 kV (power ports), 1 kV (signal ports) corresponds to degree of severity 3","reference code according to IEC 81346-2":"F","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Finely Stranded Without Core End Processing":"2x (0.25 ... 1.5 mm²)","number of CO contacts for auxiliary contacts":"0","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","operational current at AC-3e at 400 V rated value":"40 A","Size Of Contactor Can Be Combined Company-Specific":"S0","electrostatic discharge according to IEC 61000-4-2":"6 kV contact discharge / 8 kV air discharge","Type Of Voltage Supply Via Input/Output Link Master":"No","contact rating of auxiliary contacts according to UL":"B600 / R300","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Response Time Of The Grounding Protection In Settled State":"1 000 ms","Response Value Current Of The Grounding Protection Minimum":"0.75 x IMotor","Arrangement Of Electrical Connectors For Main Current Circuit":"Top and bottom","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gG: 6 A","insulation voltage with degree of pollution 3 at AC rated value":"690 V","Product Component Removable Terminal For Auxiliary And Control Circuit":"Yes","power loss [W] for rated value of the current at AC in hot operating state":"4.5 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"10 ... 40 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/517bda579b41aa42c2227ce9107b8fce.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=335166&mlfb=3RB3123-4VE0"},"ai":{"faq":[{"question":"What is the \"tripped\" message note on the 3RB3123-4VE0?","answer":"The relay provides a signaling contact output for the message \"tripped\" — a dry-contact status that changes state when the overload relay has operated, suitable for wiring to a PLC input or indicator lamp."},{"question":"What are the key ratings of the 3RB3123-4VE0?","answer":"Thermal current 40 A, rated insulation voltage 690 V, adjustable trip classes 5E/10E/20E/30E, size S0, contactor mounting with spring-loaded terminals."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB3123-4VE0","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/3RB3123-4VE0 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}}