{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2025-2PB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2025-2PB0","canonicalUrl":"https://aoctrl.com/siemens/3RB2025-2PB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2025-2PB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RB2025-2PB0 solid-state overload relay, CLASS 20E trip class, contactor mounting, IP20 front, ATEX Ex II (2) GD, 2 A at 24 V / 3 A at 230 V auxiliary contacts, 690 V AC-3 max.","salesMarkdown":"## SIRIUS 3RB2025-2PB0 — Solid-State Overload Relay in Current Production This part carries ATEX approval (PTB 06 ATEX 3001 Ex II (2) GD), making it qualifiable and traceable for hazardous-area motor circuits in pharmaceutical GMP or chemical processing lines where documentation and change control are required. The IP20 front protection suits enclosed panel mounting. ## Trip Class and Auxiliary Switching Capacity The CLASS 20E trip curve means the relay allows a 20-second cold-start overload before tripping — sized for standard induction motor starts without nuisance trips, yet fast enough to protect windings under sustained overload. This is the spec that governs motor protection coordination in the panel. Auxiliary contact ratings are documented across multiple control voltages: 2 A at 24 V, 4 A at 120 V, 3 A at 230 V, and 0.55 A at 60 V. These cover the common signal levels for PLC inputs or contactor hold coils without intermediate relays. The relay withstands surge voltage of 6 kV and burst transients of 2 kV on power ports (severity 3 per IEC 61000-4-4), which keeps the motor control circuit compliant in industrial environments with switching transients from contactors and drives. Mounting type is contactor mounting — the relay clips directly onto the matching SIRIUS contactor (e.g., 3RT series), saving DIN-rail space and reducing wiring between the overload and the contactor power terminals. No separate base or adapter required. Dimensions: 45 mm width, 73 mm height, 75 mm depth. The 45 mm width matches a standard 2.5-module DIN-rail footprint when mounted on the contactor. The 75 mm depth is the overall projection from the contactor face. Terminals accept solid conductors 0.5 to 4 mm² (2x 0.5 to 2.5 mm² for the main circuit), screw-type. AWG equivalents: 2x 14 to 10 for main contacts. No special crimp tools needed for the solid-wire range. Shock resistance is 15g for 11 ms — adequate for machine-mounted applications on conveyors or pumps. The relay carries ATEX Ex II (2) GD certification (PTB 06 ATEX 3001), allowing installation in Zone 1/2 gas and Zone 21/22 dust atmospheres when paired with an appropriate contactor and enclosure. The 100 % relative humidity rating during operation confirms suitability for condensing environments. Pollution degree 3 rated at 690 V, which covers industrial environments with conductive pollution. Power dissipation at AC in hot operating state is 0.05 W total, 0.02 W per pole — negligible for panel thermal budgeting.","metaTitle":"Siemens 3RB2025-2PB0 SIRIUS Solid-State Overload Relay, CLAS","metaDescription":"Siemens SIRIUS 3RB2025-2PB0 solid-state overload relay, CLASS 20E trip class, contactor mounting, ATEX Ex II (2) GD. Current production. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"75 mm","Solid":"0.5 ... 4 mm², 2x (0.5 ... 2.5 mm²)","Width":"45 mm","Height":"73 mm","Maximum":"2 000 m","Upwards":"0 mm","at 24 V":"2 A","at 60 V":"0.55 A","Forwards":"0 mm","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","On The Front":"IP20","Mounting type":"Contactor mounting","During Storage":"-40 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +80 °C","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 Auxiliary Contacts":"0","For Main Current Circuit":"screw-type terminals","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"0.05 W","Relative humidity during operation":"100 %","due to burst acc. to IEC 61000-4-4":"2 kV (power ports), 1 kV (signal ports) corresponds to degree of severity 3","at AWG conductors for main contacts":"2x (14 ... 10)","Surge voltage resistance rated value":"6 kV","Reference code acc. to DIN EN 81346-2":"F","at AC in hot operating state per pole":"0.02 W","With Degree Of Pollution 3 Rated Value":"690 V","Finely Stranded With Core End Processing":"0.5 ... 2.5 mm², 2x (0.5 ... 1.5 mm²)","Number of poles for main current circuit":"3","at AWG conductors for auxiliary contacts":"2x (20 ... 14)","For Auxiliary And Control Current Circuit":"screw-type terminals","Number of NC contacts for auxiliary contacts":"1","Number of NO contacts for auxiliary contacts":"1","Electrostatic discharge acc. to IEC 61000-4-2":"6 kV contact discharge / 8 kV air discharge","Size of contactor can be combined company-specific":"S0","due to conductor-earth surge acc. to IEC 61000-4-5":"2 kV (line to earth) corresponds to degree of severity 3","Removable Terminal For Auxiliary And Control Circuit":"Yes","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 6 A","Adjustable pick-up value current of the current-dependent overload release":"0.32 ... 4 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=495704&mlfb=3RB2025-2PB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB2025-2PB0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 3RB2025-2PB0 and what is the lead time?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock figures or lead-time numbers are published here."},{"question":"What is the closest functional alternative to 3RB2025-2PB0, like 3RU2116-1FC1?","answer":"The 3RU2116-1FC1 is a bimetallic overload relay (CLASS 10A) from the same SIRIUS family, not a solid-state unit. The 3RB2025-2PB0 is the solid-state CLASS 20E counterpart. They share the contactor-mounting footprint but differ in trip technology and curve — the 3RB2025-2PB0 is preferred where vibration or frequent starts would fatigue a bimetallic element."},{"question":"What is the depth of the 3RB2025-2PB0?","answer":"The depth is 75 mm from the mounting face when installed on the contactor."},{"question":"What conductor sizes does the 3RB2025-2PB0 accept?","answer":"Solid conductors from 0.5 to 4 mm² (2x 0.5 to 2.5 mm²) for the main circuit, screw-type terminals. AWG equivalent is 2x 14 to 10 for main contacts."},{"question":"Will the 3RB2025-2PB0 drop into a panel specified for 3RU2116-1FC1 without rewiring?","answer":"Both use contactor mounting and share the same SIRIUS footprint, so the physical fit and terminal positions are identical. However, the 3RB2025-2PB0 is solid-state with CLASS 20E, while the 3RU2116-1FC1 is bimetallic CLASS 10A — verify the trip curve matches your motor starting time before swapping without a coordination review."},{"question":"What compliance documentation does Siemens provide for the 3RB2025-2PB0?","answer":"The relay carries ATEX certification (PTB 06 ATEX 3001 Ex II (2) GD) and is designed to meet IEC 61000-4-4 burst and IEC 61000-4-5 surge requirements. Standard Siemens documentation includes the declaration of conformity, ATEX certificate, and IEC/EN product standard compliance. RoHS and REACH declarations are available from Siemens upon request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2025-2PB0","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/3RB2025-2PB0 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}}