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Schneider Electric SR2B121FU

Schneider SR2B121FU Zelio Logic, 8 Inputs, Clock

MPNSR2B121FU
Active

Schneider Electric Zelio Logic SR2B121FU compact smart relay, 100–240 V AC supply, 8 discrete inputs, relay outputs, real-time clock, current production.

$78.74Ref. price · indicative, final on quote
Schneider Electric SR2B121FU datasheet (PDF)
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MOQ1 pcs
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Specifications

SR2B121FU key specifications
ParameterValue
Protection typeAgainst inversion of terminals (control instructions not executed)
Range of productZelio Logic
Product or component typeCompact smart relay
Isolation voltage1780 V
Supply voltage limits85...264 V
Discrete input voltage100...240 V AC
Supply voltage100...240 V AC
Voltage state 0 guaranteed= 0.17 mA discrete input)
Voltage state 1 guaranteed>= 79 V discrete input
[Uimp] rated impulse withstand voltage4 kV EN/IEC 60947-1 and EN/IEC 60664-1
Discrete input current0.6 mA
Maximum supply current30 mA 240 V without extension) 80 mA 100 V without extension)

All specifications

SR2B121FU additional specifications
ParameterValue
Current state 0 guaranteed= 10 mA 12 V relay output)
Power consumption in7 VA without extension
Supply frequency50/60 Hz
Operating rate in0.1 Hz at Ie)relay output 10 Hz no load)relay output
Discrete input frequency47...53 Hz 57...63 Hz
IP degree of protectionIP20 IEC 60529 terminal block) IP40 IEC 60529 front panel)
Connections - terminalsScrew 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
Response time50 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
Pollution degree2 IEC 61131-2
Relative humidity95 % without condensation or dripping water
Operating altitude6561.68 ft (2000 m)
Maximum altitude transport10000 ft (3048 m)
Mechanical durability10000000 cycles relay output
StandardsIEC 61000-4-4 level 3 IEC 60068-2-27 Ea IEC 61000-4-5 IEC 61000-4-11 IEC 61000-4-12 IEC 61000-4-3 IEC 60068-2-6 Fc IEC 61000-4-2 level 3 IEC 61000-4-6 level 3
ClockWith
ChecksProgram memory on each power up
CategoryUS1000I22378
Cycle time6...90 ms
Backup time10 years 77 °F (25 °C)
Clock drift12 min/year 32...131 °F (0...55 °C) 6 s/month 77 °F (25 °C)
Local displayWith
Tightening torque4.4 lbf.in (0.5 N.m)
Overvoltage categoryIII conforming to IEC 60664-1
Discrete input number8
Immunity to microbreaks10 ms
Environmental characteristicEMC 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 lines0...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

Product details

The SR2B121FU: The cycle time spans 6 to 90 ms, and the clock holds 10 years of backup at 25 °C with a drift of 12 minutes per year over the full 0–55 °C range. These figures mean the relay can hold time-stamped schedules through extended power outages without external battery changes.

The SR2B121FU carries a lifecycle status of current, so there is no phase-out or end-of-life pressure. A buyer can lock it into the BOM as a stable, active-sourced line item. One in the cabinet as a critical spare makes sense for any small machine running Zelio Logic.

The relay meets IEC 61000-4-4 level 3, IEC 60068-2-27 Ea, and other surge, burst, and ESD standards listed in the specification. It is also compliant with EMC directives for industrial and residential environments (IEC 61000-6-2, -6-3, -6-4) and carries pollution degree 2 per IEC 61131-2. Overvoltage category III suits fixed-installation panels.

Frequently asked questions

Does SR2B121FU have a real-time clock?

Yes, it includes a real-time clock with 10-year backup at 25 °C and a drift of 12 minutes per year over 0–55 °C.

Does the relay check its program memory on startup?

Yes, it checks program memory on each power-up to ensure integrity.

What compliance standards does SR2B121FU meet?

It meets IEC 61000-4-4 level 3, IEC 60068-2-27 Ea, and other EMC/immunity standards, plus EMC directives for industrial and residential environments (IEC 61000-6-2/3/4) and IEC 61131-2 zone B.

MPN
SR2B121FU