{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SR2E121BD","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"SR2E121BD","canonicalUrl":"https://aoctrl.com/schneider/SR2E121BD","factsUrl":"https://aoctrl.com/api/mcp/products/SR2E121BD","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Zelio Logic compact smart relay SR2E121BD, 24 V DC, 8 discrete inputs, relay outputs, real-time clock with program memory integrity check on each power-up.","salesMarkdown":"It brings 8 discrete inputs per IEC 61131-2 Type 1 and relay outputs with a mechanical durability of 10 million cycles. A real-time clock is onboard, backed for 10 years at 77 °F (25 °C), and the unit checks program memory on each power-up — a detail that matters for unattended restarts or safety-related logic where memory corruption must be caught early. Cycle time is 6...90 ms, setting the scan rate for ladder or FBD programs — typical for a smart relay, but if your application needs deterministic response below 10 ms, confirm the worst-case scan against your timing budget. Relay outputs switch at 0.1 Hz under load (Ie) and up to 10 Hz unloaded, with response times of 10 ms ON / 5 ms OFF. Off-state leakage and voltage state 0 guaranteed at 12 V / 10 mA; the current state 1 threshold is ≥ 15 V for the discrete input circuit. These are the numbers you need to match against your load switching profile. Clock drift is specified at 12 min/year over the full 32...131 °F range, or 6 s/month at 77 °F — acceptable for time-stamping and scheduling in most panel applications. Backup time of 10 years at 25 °C means the clock survives extended power-offs without external battery changes. ## Compliance and environmental tolerances Standards coverage includes IEC 61131-2 (Type 1 inputs, Zone B EMC), IEC 61000-6-2/3/4, and individual surge, burst, and radiated immunity tests at Level 3. Operating altitude 2000 m, IP40 front panel / IP20 terminals. These certifications align with the documentation a quality or safety engineer looks for when approving a smart relay for control panels.","metaTitle":"Schneider SR2E121BD Zelio Logic Smart Relay, 24 V DC, 8 Inpu","metaDescription":"Schneider SR2E121BD Zelio Logic compact smart relay, 24 V DC supply, 8 discrete inputs, relay outputs, real-time clock with program memory check on power-up. 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 61000-4-11 IEC 61000-4-12 IEC 61000-4-3 IEC 61000-4-6 level 3 IEC 61000-4-2 level 3 IEC 60068-2-6 Fc IEC 61000-4-4 level 3 IEC 61000-4-5 IEC 60068-2-27 Ea","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":"10 ms from state 0 to state 1)relay output 5 ms from state 1 to state 0)relay output","lifecycle_stage":"current","Pollution degree":"2 IEC 61131-2","Range of Product":"Zelio Logic","Relative Humidity":"95 % without condensation or dripping water","Tightening Torque":"4.4 lbf.in (0.5 N.m)","Counting frequency":"1 kHz discrete input","Operating altitude":"6561.68 ft (2000 m)","Discrete input type":"Resistive","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 IEC 61131-2 Type 1","Mechanical durability":"10000000 cycles relay output","Nbr. of units in pkg.":"1","Supply voltage limits":"19.2...30 V","Discrete input current":"4 mA","Discrete input voltage":"24 V DC","Maximum supply current":"100 mA without extension)","Power dissipation in W":"3 W 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":"1 ms","Product or Component Type":"Compact smart relay","[Us] rated supply voltage":"24 V DC","Current state 0 guaranteed":"= 10 mA 12 V relay output)","Maximum altitude transport":"10000 ft (3048 m)","Voltage state 0 guaranteed":"= 1.2 mA IB...IG used as discrete input circuit) >= 2.2 mA I1...IA and IH...IR discrete input circuit)","Voltage state 1 guaranteed":">= 15 V I1...IA and IH...IR discrete input circuit >= 15 V IB...IG used as discrete input circuit","Reverse polarity protection":"With","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":"$63.50","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/74d55c686318705ce2d9e970cdbe0a81.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/SR2E121BD/alternatives.json"},"ai":{"faq":[{"question":"What is the clock feature on the SR2E121BD?","answer":"The SR2E121BD includes a real-time clock (marked as 'With' in the spec). It has a backup time of 10 years at 77 °F (25 °C) and a drift of 12 min/year across the full temperature range (32...131 °F) or 6 s/month at 77 °F."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/SR2E121BD","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/SR2E121BD 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}}