{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2016-2ND0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2016-2ND0","canonicalUrl":"https://aoctrl.com/siemens/3RB2016-2ND0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2016-2ND0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3RB2016-2ND0, CLASS 20E, 3-pole, screw-type main terminals, 45 mm width, ATEX Ex II (2) GD.","salesMarkdown":"The Siemens SIRIUS 3RB2016-2ND0 is a solid-state overload relay — the electronic equivalent of a bimetal relay, protecting a three-phase motor from sustained overcurrent without the thermal drift of a mechanical heater. The CLASS 20E trip class means it allows a locked-rotor current (typically 6× FLA) to persist for roughly 10–20 seconds before tripping, which is the standard choice for standard-start induction motors driving pumps, fans, or compressors where the start is under 10 seconds. This relay mounts directly onto a contactor (contactor mounting, per the spec) rather than onto a DIN rail, saving panel width — the unit is 45 mm wide, 64 mm tall, and 73 mm deep, sized to sit flush on the matching SIRIUS contactor. Three poles for the main current circuit, with screw-type terminals on the power side accepting 2× (0.25 … 1.5 mm²) solid or 2× (18 … 14 AWG) stranded. The auxiliary and control circuit uses spring-loaded terminals, which means no re-torquing during thermal cycling — a reliability point for panels subject to vibration or temperature swings. The auxiliary contact ratings are given per voltage: 2 A at 24 V, 4 A at 120 V, 3 A at 230 V, and 0.55 A at 60 V, 0.3 A at 110/125 V, 0.11 A at 220 V — these are the make/break capacities for the signal side, not the motor power circuit. Surge voltage resistance is rated at 6 kV, and EMC burst immunity meets 2 kV on power ports and 1 kV on signal ports (severity level 3 per IEC 61000-4-4). That means it can live in a panel with contactors and drives without false tripping from line transients. ## Where it goes and what approvals it carries This is a motor-protection device for a control panel — it sits between the contactor and the motor, monitoring phase current and tripping the contactor coil on overload. The ATEX approval (PTB 06 ATEX 3001 Ex II (2) GD) means it can be used in the control circuit of equipment installed in a potentially explosive atmosphere (gas or dust), specifically as a protective device associated with category 2 equipment. The operating temperature range is -25 … +60 °C, storage and transport -40 … +80 °C, with 100 % relative humidity allowed during operation — so it can go into a washdown-adjacent enclosure without a heater.","metaTitle":"Siemens 3RB2016-2ND0 SIRIUS solid-state overload relay, CLAS","metaDescription":"Siemens SIRIUS 3RB2016-2ND0 solid-state overload relay, CLASS 20E trip, 3-pole, 45mm wide, ATEX certified, screw-type main terminals, current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"73 mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"45 mm","Height":"64 mm","Upwards":"0 mm","at 24 V":"2 A","at 60 V":"0.55 A","Forwards":"0 mm","Per Pole":"0.02 W","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","Backwards":"0 mm","Downwards":"0 mm","Trip Class":"CLASS 20E","At The Side":"6 mm","During Storage":"-40 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +80 °C","Fastening Method":"Contactor mounting","Shock Resistance":"15g / 11 ms","Mounting Position":"any","Product Brand Name":"SIRIUS","Type Of Protection":"PTB 06 ATEX 3001 Ex II (2) GD","Product Designation":"solid-state overload relay","For Main Current Circuit":"screw-type terminals","Substance Prohibitance (Date)":"07/01/2006","at AWG cables for main contacts":"2x (18 ... 14)","For Auxiliary And Control Circuit":"spring-loaded terminals","Relative Humidity During Operation":"100 %","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (24 ... 16)","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","number of CO contacts for auxiliary contacts":"0","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","Size Of Contactor Can Be Combined Company-Specific":"S00","electrostatic discharge according to IEC 61000-4-2":"6 kV contact discharge / 8 kV air discharge","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/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":"0.05 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"0.32 ... 1.25 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=335816&mlfb=3RB2016-2ND0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB2016-2ND0/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation does this part carry?","answer":"The part carries ATEX approval PTB 06 ATEX 3001 Ex II (2) GD for use in potentially explosive atmospheres. It also references a substance prohibition date of 07/01/2006, consistent with RoHS compliance. The surge voltage and EMC burst ratings indicate it meets IEC 61000-4-4 severity level 3."},{"question":"What are the key dimensions for panel planning?","answer":"Width 45 mm, height 64 mm, depth 73 mm. It mounts onto a contactor (contactor mounting), not on a DIN rail, so no additional width is taken by a base adapter. Clearance: 0 mm upward, forward, backward, and downward; 6 mm at the side."},{"question":"Will this drop into a panel specified around a 3RT1023-1AL20 contactor?","answer":"This overload relay is designed for contactor mounting, and the SIRIUS 3RT series is the matching contactor family. The 3RB2016-2ND0 is a 45 mm wide unit that mounts directly onto the contactor — no separate DIN-rail base. If the panel was built around a 3RT1023 frame, this relay should interface without rewiring, but verify the contactor frame size and the auxiliary contact wiring scheme (spring-loaded terminals on the control side)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2016-2ND0","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/3RB2016-2ND0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}