{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SR3B261B","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"SR3B261B","canonicalUrl":"https://aoctrl.com/schneider/SR3B261B","factsUrl":"https://aoctrl.com/api/mcp/products/SR3B261B","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Zelio Logic modular smart relay, SR3B261B, 16 discrete inputs, 24 V AC supply, real-time clock with 10-year backup, screw terminals, IP20/IP40.","salesMarkdown":"Out here in the grease, when you need a compact brain for a pump skid or a small conveyor section, the Zelio Logic SR3B261B is a modular smart relay that doesn't need a whole PLC rack. It gives you 16 discrete inputs on 24 V AC, a real-time clock that keeps time for ten years off battery, and a self-check that runs program memory verification every time you power it up. That clock drift runs about 12 minutes a year over the 0–55 °C range, six seconds a month at 25 °C—tight enough for timed cycle control. Cycle time lands between 6 and 90 ms, depending on the program size, and the ladder response on a discrete input is a fixed 50 ms—predictable, no surprises. The backup time on the clock is rated ten years at 25 °C, so you can cycle the panel and not lose your time-of-day schedule. The compliance paperwork is all there: IEC 61131-2 for the hardware, EMC Directive per EN 55022 Class B for conducted and radiated emissions, plus low-voltage directive and environmental standards IEC 60068-2-6 and -27 for vibration and shock. Screw terminals accept 0.2 to 2.5 mm² solid or stranded, or two 0.2 to 1.5 mm² solid in one clamp. Torque to 0.5 N·m—four and a half pound-inches. The front panel carries an IP40 rating; the terminals are IP20. Mount it in a standard enclosure, keep it under 2000 m altitude, and it'll handle 95% humidity without condensation. Supply voltage is 20.4 to 28.8 V AC/DC, 50/60 Hz. It pulls 7.5 VA base, 10 VA with extensions. Discrete input current is 4.4 mA at 24 V. Each input guarantees a 1 state above 14 V and a 0 state below 2 V, so standard 24 V sensors work without a fight.","metaTitle":"Schneider Zelio Logic SR3B261B Smart Relay, 16 Inputs, RTC","metaDescription":"Schneider Zelio Logic SR3B261B modular smart relay with 16 discrete inputs, real-time clock, 10-year backup, program memory check, IEC 61131-2 compliant. Current production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":[],"specifications":{"Clock":"With","Checks":"Program memory on each power up","Category":"US1000I22378","Standards":"IEC 61000-4-5 IEC 61000-4-11 IEC 61000-4-2 level 3 IEC 61000-4-6 level 3 IEC 60068-2-6 Fc IEC 60068-2-27 Ea IEC 61000-4-4 level 3 IEC 61000-4-3 IEC 61000-4-12","Cycle time":"6...90 ms","Backup time":"10 years 77 °F (25 °C)","Clock drift":"12 min/year 32...131 °F (0...55 °C) 6 s/month 77 °F (25 °C)","Local display":"With","Response time":"50 ms ladder from state 0 to state 1)discrete input 50 ms ladder from state 1 to state 0)discrete input 50...255 ms FBD from state 0 to state 1)discrete input 50...255 ms FBD from state 1 to state 0)discrete input 10 ms from state 0 to state 1)relay output 5 ms from state 1 to state 0)relay output","Protection Type":"Against inversion of terminals (control instructions not executed)","lifecycle_stage":"current","Pollution degree":"2 IEC 61131-2","Range of Product":"Zelio Logic","Supply frequency":"50/60 Hz","Isolation voltage":"1780 V","Relative Humidity":"95 % without condensation or dripping water","Tightening Torque":"4.4 lbf.in (0.5 N.m)","Operating altitude":"6561.68 ft (2000 m)","Operating rate in Hz":"0.1 Hz at Ie)relay output 10 Hz no load)relay output","Overvoltage category":"III conforming to IEC 60664-1","Discrete input number":"16","Mechanical durability":"10000000 cycles relay output","Nbr. of units in pkg.":"1","Supply voltage limits":"20.4...28.8 V","Discrete input current":"4.4 mA","Discrete input voltage":"24 V AC","Maximum supply current":"280 mA without extension) 415 mA with extensions)","Connections - terminals":"Screw terminals, 1 x 0.2...1 x 2.5 mm² AWG 25...AWG 14) semi-solid Screw terminals, 1 x 0.2...1 x 2.5 mm² AWG 25...AWG 14) solid Screw terminals, 1 x 0.25...1 x 2.5 mm² AWG 24...AWG 14) flexible with cable end Screw terminals, 2 x 0.2...2 x 1.5 mm² AWG 24...AWG 16) solid Screw terminals, 2 x 0.25...2 x 0.75 mm² AWG 24...AWG 18) flexible with cable end","IP degree of protection":"IP20 IEC 60529 terminal block) IP40 IEC 60529 front panel)","Immunity to microbreaks":"10 ms repeated 20 times","Power consumption in VA":"10 VA with extensions 7.5 VA without extension","Discrete input frequency":"47...53 Hz 57...63 Hz","Product or Component Type":"Modular smart relay","[Us] rated supply voltage":"24 V","Current state 0 guaranteed":"= 10 mA 12 V relay output)","Maximum altitude transport":"10000 ft (3048 m)","Voltage state 0 guaranteed":"= 2 mA discrete input)","Voltage state 1 guaranteed":">= 14 V discrete input","Environmental characteristic":"EMC directive conforming to IEC 61000-6-2 EMC directive conforming to IEC 61000-6-3 EMC directive conforming to IEC 61000-6-4 EMC directive conforming to IEC 61131-2 zone B Low voltage directive conforming to IEC 61131-2","Disturbance radiated/conducted":"Class B EN 55022-11 group 1","Number or control scheme lines":"0...500 FBD 0...240 ladder","Ambient Air Temperature for Storage":"-40...158 °F (-40...70 °C)","Ambient air temperature for operation":"-4...104 °F (-20...40 °C) in non-ventilated enclosure IEC 60068-2-1 and IEC 60068-2-2 -4...131 °F (-20...55 °C) IEC 60068-2-1 and IEC 60068-2-2","[Uimp] rated impulse withstand voltage":"4 kV EN/IEC 60947-1 and EN/IEC 60664-1"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$134.62","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/0296a256c8b6f1ff4bfd4ff4d1052432.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/SR3B261B/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation does Schneider provide for the SR3B261B?","answer":"This smart relay complies with IEC 61131-2, EMC Directive (EN 55022 Class B), low-voltage directive, and environmental standards IEC 60068-2-6 and -27 for shock and vibration. It is rated pollution degree 2 and overvoltage category III per IEC 60664-1."},{"question":"What is the real-time clock backup time and drift?","answer":"The RTC has a 10-year backup at 25 °C. Clock drift is 12 minutes per year over 0–55 °C, or 6 seconds per month at 25 °C."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/SR3B261B","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/schneider/SR3B261B when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:21:01.794Z","lastPublished":"2026-09-02T08:21:01.794Z","indexable":true}}