{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2025-1PB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2025-1PB0","canonicalUrl":"https://aoctrl.com/siemens/3RB2025-1PB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2025-1PB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RB2025-1PB0 solid-state overload relay, CLASS 10E, screw-type terminals, contactor mounting.","salesMarkdown":"The Siemens 3RB2025-1PB0 is a SIRIUS solid-state overload relay designed for contactor mounting, providing motor protection with a CLASS 10E trip curve. It carries ATEX approval (PTB 06 ATEX 3001 Ex II (2) GD), confirming suitability for use in potentially explosive atmospheres — specifically as a protective device associated with equipment in Zone 1 or Zone 2 gas and Zone 21 or Zone 22 dust areas. The pollution degree 3 rated voltage of 690 V confirms it's designed for the conductive environments typical in factory-floor panels. The auxiliary contact block provides one N/O and one N/C contact, rated for 4 A at 120 V AC and 3 A at 230 V AC. The N/C contact is typically wired in series with the contactor coil for fail-safe trip indication. The N/O can signal a PLC input for remote alarm. Note the DC ratings: 2 A at 24 V DC, 0.55 A at 60 V DC, and 0.3 A at 125 V DC — these govern performance in 24 V DC control circuits. Side clearance of 6 mm to adjacent devices is required for heat dissipation. The solid-state design dissipates only 0.05 W total (0.02 W per pole) in the hot operating state, so internal panel heating is minimal compared to a bimetallic relay. Shock resistance is 15g for 11 ms, adequate for most industrial machinery but verify if mounted on a high-vibration pump skid. Main circuit terminals accept screw-type connections for solid conductors of 0.5 to 4 mm² (or 2× 0.5 to 2.5 mm²), and AWG 14 to 10 for the main contacts. The auxiliary contact wiring uses the same terminal range. Mounts directly onto the matching SIRIUS contactor (e.g., 3RT2 series) via the contactor mounting interface. No DIN rail required — it clips onto the contactor's top or bottom. EMC immunity is specified: 2 kV burst on power ports, 1 kV on signal ports per IEC 61000-4-4 severity level 3, and 6 kV surge voltage resistance. This means it will operate reliably in electrically noisy environments with contactor switching and VFDs nearby, without nuisance trips. Relative humidity during operation can reach 100 %, including condensation — common in unheated enclosures in humid climates. No official successor or replacement has been announced. The part is available through normal distribution. For a line-down situation, confirm the specific contactor frame size it mates to (the 3RB2 series mates to SIRIUS 3RT2 contactors up to a certain frame) to ensure the mechanical interface matches your existing panel.","metaTitle":"Siemens 3RB2025-1PB0 SIRIUS Solid-State Overload Relay, CLAS","metaDescription":"Siemens 3RB2025-1PB0 SIRIUS solid-state overload relay, CLASS 10E trip curve, ATEX Ex II (2) GD, contactor mounting, IP20 front, 690 V AC-3 max. Sourced to order. 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 10E","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":"1 ... 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=325837&mlfb=3RB2025-1PB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB2025-1PB0/alternatives.json"},"ai":{"faq":[{"question":"What is the trip class of this overload relay?","answer":"CLASS 10E, meaning it will trip within 10 seconds at 7.2× the thermal current setting. This is the standard class for most general-purpose induction motor starts."},{"question":"Does it have ATEX approval for hazardous areas?","answer":"Yes, it carries ATEX certification PTB 06 ATEX 3001 Ex II (2) GD, making it suitable for use as an associated apparatus in Zone 1/2 gas and Zone 21/22 dust atmospheres when installed in a suitable enclosure."},{"question":"What are the auxiliary contact ratings?","answer":"One N/O and one N/C contact. Rated 4 A at 120 V AC, 3 A at 230 V AC, 2 A at 24 V DC, 0.55 A at 60 V DC, and 0.3 A at 125 V DC."},{"question":"What conductor sizes does it accept?","answer":"Screw terminals accept solid conductors of 0.5 to 4 mm² (or 2× 0.5 to 2.5 mm²) for the main circuit and auxiliary contacts. AWG 14 to 10 for the main contacts."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2025-1PB0","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/3RB2025-1PB0 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}}