Main range of productZelio Logic product or component typeCompact smart relay Complementary local displayWith number or control scheme lines0...500 with FBD programming0...240 with ladder programming cycle time6...90 ms backup time10 years at 25 °C clock drift6 s/month at 25 °C12 min/year at 0...55 °C checksProgram memory on each power up [Us] rated supply voltage24 V AC supply voltage limits20.4...28.8 V supply frequency50/60 Hz supply current145 mA (without extension) power consumption in VA4 VA without extension isolation voltage1780 V protection typeAgainst inversion of terminals (control instructions not executed) discrete input number8 discrete input voltage24 V AC discrete input current4.4 mA discrete input frequency47...53 Hz57...63 Hz voltage state 1 guaranteed>= 14 V for discrete input voltage state 0 guaranteed<= 5 V for discrete input current state 1 guaranteed>= 2 mA for discrete input current state 0 guaranteed<= 0.5 mA for discrete input input impedance4.6 kOhm (discrete input) number of outputs4 relay output(s) output voltage limits24...250 V AC5...30 V DC (relay output) contacts type and compositionNO for relay output output thermal current8 A for all 4 outputs (relay output) electrical durability500000 cycles AC-12 at 230 V, 1.5 A for relay output conforming to EN/IEC 60947-5-1500000 cycles AC-15 at 230 V, 0.9 A for relay output conforming to EN/IEC 60947-5-1500000 cycles DC-12 at 24 V, 1.5 A for relay output conforming to EN/IEC 60947-5-1500000 cycles DC-13 at 24 V, 0.6 A for relay output conforming to EN/IEC 60947-5-1 switching capacity in mA>= 10 mA at 12 V (relay output) operating rate in Hz0.1 Hz (at Ie) for relay output10 Hz (no load) for relay output mechanical durability10000000 cycles (relay output) [Uimp] rated impulse withstand voltage4 kV conforming to EN/IEC 60947-1 and EN/IEC 60664-1 clockWith response time10 ms (from state 0 to state 1) for relay output5 ms (from state 1 to state 0) for relay output50 ms with ladder programming (from state 0 to state 1) for discrete input50 ms with ladder programming (from state 1 to state 0) for discrete input50...255 ms with FBD programming (from state 0 to state 1) for discrete input50...255 ms with FBD programming (from state 1 to state 0) for discrete input connections - terminalsScrew terminals, clamping capacity: 1 x 0.2...1 x 2.5 mm² AWG 25...AWG 14 semi-solidScrew terminals, clamping capacity: 1 x 0.2...1 x 2.5 mm² AWG 25...AWG 14 solidScrew terminals, clamping capacity: 1 x 0.25...1 x 2.5 mm² AWG 24...AWG 14 flexible with cable endScrew terminals, clamping capacity: 2 x 0.2...2 x 1.5 mm² AWG 24...AWG 16 solidScrew terminals, clamping capacity: 2 x 0.25...2 x 0.75 mm² AWG 24...AWG 18 flexible with cable end tightening torque0.5 N.m overvoltage categoryIII conforming to EN/IEC 60664-1 product weight0.25 kg Environment immunity to microbreaks<= 10 ms repeated 20 times product certificationsCSAC-TickGLGOSTUL standardsEN/IEC 60068-2-27 EaEN/IEC 60068-2-6 FcEN/IEC 61000-4-11EN/IEC 61000-4-12EN/IEC 61000-4-2 level 3EN/IEC 61000-4-3EN/IEC 61000-4-4 level 3EN/IEC 61000-4-5EN/IEC 61000-4-6 level 3 IP degree of protectionIP20 (terminal block) conforming to IEC 60529IP40 (front panel) conforming to IEC 60529 environmental characteristicEMC directive conforming to EN/IEC 61000-6-2EMC directive conforming to EN/IEC 61000-6-3EMC directive conforming to EN/IEC 61000-6-4EMC directive conforming to EN/IEC 61131-2 zone BLow voltage directive conforming to EN/IEC 61131-2 disturbance radiated/conductedClass B conforming to EN 55022-11 group 1 pollution degree2 conforming to EN/IEC 61131-2 ambient air temperature for operation-20...40 °C in non-ventilated enclosure conforming to IEC 60068-2-1 and IEC 60068-2-2-20...55 °C conforming to IEC 60068-2-1 and IEC 60068-2-2 ambient air temperature for storage-40...70 °C operating altitude2000 m altitude transport<= 3048 m relative humidity95 % without condensation or dripping water Contractual warranty Warranty period18 months
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CatalogueSizeAdd to My DocumentsUser guideSizeAdd to My DocumentsCADSizeAdd to My DocumentsCompact smart relays with display 12 V DC or 24 V DC or 24 V AC or 100 to 240 V AC (Version 1.1)CAD files for SR2B121B: Compact smart relay Zelio Logic - 12 IO - 24 V AC - clock - display (Version 1.0)CertificateSizeAdd to My DocumentsInstruction sheetSizeAdd to My DocumentsDeclaration of conformitySizeAdd to My DocumentsEnd of Life InformationSizeAdd to My DocumentsMarine certificateSizeAdd to My Documents
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Dimensions DrawingsCompact and Modular Smart RelaysMounting on 35 mm/1.38 in. DIN Rail(1)With SR2USB01 or SR2BTC01Screw Fixing (Retractable Lugs)(1)With SR2USB01 or SR2BTC01Position of Display
Connections and SchemaConnection of Smart Relays on AC SupplySR••••1B, SR••••1FU(1)1 A quick-blow fuse or circuit-breaker.(2)Fuse or circuit-breaker.(3)Inductive load.(4)Q9 and QA: 5 A (max. current in terminal C: 10 A).With Discrete I/O Extension Module
SR3B•••B + SR3XT•••B, SR3B•••FU + SR3XT•••FU(1)1 A quick-blow fuse or circuit-breaker.
NOTE: QF and QG: 5 A for SR3XT141••
Performance CurvesCompact and Modular Smart RelaysElectrical Durability of Relay Outputs
(in millions of operating cycles, conforming to IEC/EN 60947-5-1)
AC-12 (1)X:Current (A)Y:Millions of operating cycles(1)AC-12: switching resistive loads and opto-coupler isolated solid-state loads, cos ≥ 0.9.
AC-14 (1)X:Current (A)Y:Millions of operating cycles(1)AC-14: switching small electromagnetic loads ≤ 72 VA, make: cos = 0.3, break: cos = 0.3.
AC-15 (1)X:Current (A)Y:Millions of operating cycles(1)AC-15: switching electromagnetic loads ≥ 72 VA, make: cos = 0.7, break: cos = 0.4.