
Telemecanique Sensors SR2B121BD Compact Smart Relay, 12 I/O, 24V DC, 4 Relay Outputs, with Clock and Display
- MPN: SR2B121BD
- PPN: SCH-SR2B121BD
CAD
$262.14
/ EA
Lead times may vary. For an accurate estimate please contact us.
Loading dialog...
Looking to buy a large quantity?
To View Branch Inventory And Your Custom Pricing
Description
Features
- Equipped with 12 onboard I/O points consisting of 8 digital inputs and 4 relay outputs, this compact Zelio Logic smart relay is ideal for managing small-scale automation loops. Four of the digital inputs can be configured as high-resolution 0-10V analog inputs, allowing system integrators to monitor temperature sensors, pressure transducers.
- Designed to operate on a stable 24V DC input voltage, this smart relay features a wide acceptable voltage tolerance to handle the charging and discharging cycles of backup battery systems and industrial power supplies. This makes it an excellent, resilient choice for remote telemetry stations, solar-powered water pumps, and critical backup infrastructure where utility AC power is unavailable or unreliable.
Documentation & Downloads
Specifications
Key Specifications
| Range Of Product | Zelio Logic |
|---|
| Product Or Component Type | compact smart relay |
|---|
Complementary
| Contacts Type And Composition | NO relay output |
|---|---|
| Discrete Input Type | resistive |
| Analogue Input Range | 0...10 V || 0...24 V |
| Output Thermal Current | 8 A for all 4 outputs relay output |
| Number Or Control Scheme Lines | 0-240 ladder || 0-500 FBD |
| Backup Time | 10 years 25 °C |
| Analogue Input Type | common mode |
| Current State 1 Guaranteed | >= 1.2 mA IB...IG used as discrete input circuit) || >= 2.2 mA I1...IA and IH...IR discrete input circuit) |
| Clock | with |
| Local Display | with |
| [Uimp] Rated Impulse Withstand Voltage | 4 kV EN/IEC 60947-1 and EN/IEC 60664-1 |
| Output Voltage Limits | 24...250 V AC relay output) || 5...30 V DC relay output) |
| Electrical Durability | AC-12 500000 cycles 230 V, 1.5 A relay output IEC 60947-5-1 || AC-15 500000 cycles 230 V, 0.9 A relay output IEC 60947-5-1 || DC-12 500000 cycles 24 V, 1.5 A relay output IEC 60947-5-1 || DC-13 500000 cycles 24 V, 0.6 A relay output IEC 60947-5-1 |
| Analogue Input Number | 4 |
| Input Compatibility | 3-wire proximity sensors PNP discrete input |
| Supply Voltage Limits | 19.2-30 V |
| Overvoltage Category | III IEC 60664-1 |
| Maximum Supply Current | 100 mA without extension) |
| Temperature Probe Type | NTC 10k 25 °C || NTC 1000k 25 °C || KTY81 210/220/221/222/250 || Pt 500 |
| Analogue Input Resolution | 8 bits |
| Counting Frequency | 1 kHz discrete input |
| Cycle Time | 6-90 ms |
| Maximum Permissible Voltage | 30 V analogue input circuit |
| [Us] Rated Supply Voltage | 24 V DC |
| Input Impedance | 12 kOhm IB...IG used as analogue input circuit || 12 kOhm IB...IG used as discrete input circuit || 7.4 kOhm I1...IA and IH...IR discrete input circuit |
|---|---|
| Number Of Outputs | 4 relay |
| Conversion Error | +/- 5 % 25 °C analogue input circuit || +/- 6.2 % 55 °C analogue input circuit |
| Discrete Input Voltage | 24 V DC |
| Lsb Value | 39 mV analogue input circuit |
| Clock Drift | 12 min/year 0-55 °C || 6 s/month 25-25 °C |
| Discrete Input Current | 4 mA |
| Response Time | 10 ms from state 0 to state 1)relay output || 5 ms from state 1 to state 0)relay output |
| Power Dissipation In W | 3 W without extension |
| Net Weight | 0.25 kg |
| Voltage State 0 Guaranteed | <= 5 V I1...IA and IH...IR discrete input circuit || <= 5 V IB...IG used as discrete input circuit |
| Conversion Time | smart relay cycle time analogue input circuit |
| 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 |
| Voltage State 1 Guaranteed | >= 15 V I1...IA and IH...IR discrete input circuit || >= 15 V IB...IG used as discrete input circuit |
| Current State 0 Guaranteed | <= 0.5 mA IB...IG used as discrete input circuit) || <= 0.75 mA I1...IA and IH...IR discrete input circuit) |
| Operating Distance | 10 m between stations, with screened cable (sensor not isolated) analogue input circuit |
| Mechanical Durability | 10000000 cycles relay output |
| Tightening Torque | 0.5 N.m |
| Switching Capacity In Ma | >= 10 mA 12 V relay output) |
| Operating Rate In Hz | 0.1 Hz at Ie)relay output || 10 Hz no load)relay output |
| Discrete Input Number | 8 IEC 61131-2 Type 1 |
| Reverse Polarity Protection | with |
| Repeat Accuracy | +/- 2 % 55 °C analogue input circuit |
| Checks | program memory on each power up |
Environment
| Product Certifications | GL || CSA || UL || GOST || C-Tick |
|---|---|
| Disturbance Radiated/Conducted | class B EN 55022-11 group 1 |
| Immunity To Microbreaks | 1 ms |
| Ip Degree Of Protection | IP20 IEC 60529 terminal block) || IP40 IEC 60529 front panel) |
| Ambient Air Temperature For Storage | -40-70 °C |
| Maximum Altitude Transport | 3048 m |
| Standards | IEC 61000-4-12 || IEC 61000-4-4 level 3 || IEC 61000-4-5 || IEC 61000-4-11 || IEC 61000-4-2 level 3 || IEC 60068-2-6 Fc || IEC 61000-4-6 level 3 || IEC 60068-2-27 Ea || IEC 61000-4-3 |
|---|---|
| Ambient Air Temperature For Operation | -20-40 °C in non-ventilated enclosure IEC 60068-2-1 and IEC 60068-2-2 || -20-55 °C IEC 60068-2-1 and IEC 60068-2-2 |
| Environmental Characteristic | EMC directive IEC 61000-6-2 || EMC directive IEC 61000-6-3 || EMC directive IEC 61000-6-4 || EMC directive IEC 61131-2 zone B || low voltage directive IEC 61131-2 |
| Pollution Degree | 2 IEC 61131-2 |
| Relative Humidity | 95-95 % without condensation or dripping water |
| Operating Altitude | 2000 m |
Contractual warranty
| Warranty | 18 months |
|---|
Offer Sustainability
| Rohs Exemption Information | Yes |
|---|---|
| Environmental Disclosure | ENVPEP060406EN |
| Pvc Free | Yes |
| Weee | The product must be disposed on European Union markets following specific waste collection and never end up in rubbish bins |
| Circularity Profile | ENVEOLI0604006EN |
| Mercury Free | Yes |
|---|---|
| Sustainable Offer Status | Green Premium product |
| Reach Regulation | Reference contains Substances of Very High Concern above the threshold |
| China Rohs Regulation | X |
| Eu Rohs Directive | Pro-active compliance (Product out of EU RoHS legal scope) |





Accessories
Loading carousel layout...
Loading carousel layout...
Similar Products
Loading carousel layout...
Loading carousel layout...
CAD
$262.14
/ EA
Lead times may vary. For an accurate estimate please contact us.
Loading dialog...
Looking to buy a large quantity?
To View Branch Inventory And Your Custom Pricing
CAD$262.14/ EA
Loading add to cart quantity...


















