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Schneider Electric SR2E121B

Schneider SR2E121B Zelio Logic Smart Relay, 24 V AC, Current

MPNSR2E121B
Active

Schneider Electric Zelio Logic SR2E121B compact smart relay, 24 V AC supply, 8 discrete inputs, relay outputs.

$64.77Ref. price · indicative, final on quote
Schneider Electric SR2E121B 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

SR2E121B 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 limits20.4...28.8 V
Discrete input voltage24 V AC
Supply voltage24 V AC
Voltage state 0 guaranteed= 2 mA discrete input)
Voltage state 1 guaranteed>= 14 V discrete input
[Uimp] rated impulse withstand voltage4 kV EN/IEC 60947-1 and EN/IEC 60664-1
Discrete input current4.4 mA
Maximum supply current145 mA without extension)

All specifications

SR2E121B additional specifications
ParameterValue
Current state 0 guaranteed= 10 mA 12 V relay output)
Power consumption in4 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 61000-4-6 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
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 displayWithout
Tightening torque4.4 lbf.in (0.5 N.m)
Overvoltage categoryIII conforming to IEC 60664-1
Discrete input number8
Immunity to microbreaks10 ms repeated 20 times
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

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.

Frequently asked questions

What is the listed clock on this smart relay?

The relay includes a real-time clock (specified as 'Clock With'), meaning it has an onboard timekeeping function.

What program checks does the SR2E121B perform?

The relay performs a program memory check on each power-up to verify integrity.

What compliance documentation applies to this part?

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.

MPN
SR2E121B