{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SR2E121B","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"SR2E121B","canonicalUrl":"https://aoctrl.com/schneider/SR2E121B","factsUrl":"https://aoctrl.com/api/mcp/products/SR2E121B","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Zelio Logic SR2E121B compact smart relay, 24 V AC supply, 8 discrete inputs, relay outputs.","salesMarkdown":"## SR2E121B – a sourcing note The relay runs a programmed logic cycle in 6...90 ms, retains program memory and real-time clock backup for 10 years at 25 °C, and includes an automatic program memory check on each power-up. The absence of a local display means the program is set and monitored via a PC or external HMI; for field service, the relay's IP20 terminals and IP40 front panel are standard for panel mounting. ## Installation and environmental notes Rated for pollution degree 2 per IEC 61131-2 and overvoltage category III (IEC 60664-1). Isolation voltage is 1780 V. Tightening torque for screw terminals: 0.5 N·m. Operating temperature (not explicitly listed here, but environmental standards include IEC 60068-2-27 Ea shock and IEC 60068-2-6 Fc vibration). Altitude: 2000 m. Humidity: 95% without condensation. Response times: 10 ms relay pick-up, 5 ms drop-out. Contact operating rate at rated load is 0.1 Hz.","metaTitle":"Schneider SR2E121B Zelio Logic Smart Relay, 24 V AC, Current","metaDescription":"Schneider SR2E121B Zelio Logic compact smart relay with 8 discrete 24 V AC inputs, relay outputs, active production. Cycle time 6-90 ms, backup time 10 years. Sourced to order.","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 61000-4-6 level 3 IEC 60068-2-27 Ea IEC 61000-4-11 IEC 60068-2-6 Fc IEC 61000-4-4 level 3 IEC 61000-4-5 IEC 61000-4-3 IEC 61000-4-2 level 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":"Without","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":"8","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":"145 mA without extension)","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":"4 VA without extension","Discrete input frequency":"47...53 Hz 57...63 Hz","Product or Component Type":"Compact smart relay","[Us] rated supply voltage":"24 V AC","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...240 ladder 0...500 FBD","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":"$64.77","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/88356db782a73bd6e282bffc0945466d.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/SR2E121B/alternatives.json"},"ai":{"faq":[{"question":"What is the listed clock on this smart relay?","answer":"The relay includes a real-time clock (specified as 'Clock With'), meaning it has an onboard timekeeping function."},{"question":"What program checks does the SR2E121B perform?","answer":"The relay performs a program memory check on each power-up to verify integrity."},{"question":"What compliance documentation applies to this part?","answer":"The SR2E121B conforms to EMC directive IEC 61000-6-2, -3, -4, IEC 61131-2, and EN 55022-11 Class B for radiated/conducted emissions. It also meets IEC 61000-4 series immunity standards at level 3."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/SR2E121B","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/SR2E121B 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}}