Schneider Electric SR2B121FU Zelio Logic Compact Smart Relay
The SR2B121FU is a compact smart relay from the Schneider Electric Zelio Logic series. It packs 12 I/O points into a slim DIN rail housing. Eight inputs accept 100-240V AC directly. Four relay outputs switch loads up to 8 A each. An integrated real-time clock supports time-based control. The LCD and navigation buttons allow fast local programming and live diagnostics. This module suits small machines, lighting control, pumping, and building automation. It replaces classic relay logic with flexible ladder or FBD programming. Oiltech Controls supplies tested units ready for immediate deployment.
Why Buy From Oiltech Controls?
- 15+ years in industrial automation spare parts
- Worldwide shipping through FedEx, UPS, and DHL
- Tested surplus and refurbished options available
- 12-month warranty on every unit
- Technical verification before dispatch
- Strong support for obsolete control systems
Technical Specifications
| Brand | Schneider Electric |
| Model | SR2B121FU |
| Series | Zelio Logic |
| Module Type | Compact smart relay |
| I/O Points | 12 |
| Digital Inputs | 8, 100-240V AC |
| Digital Outputs | 4 relay |
| Output Current | 8 A thermal per output |
| Supply Voltage | 100-240V AC, 85-264V, 50/60 Hz |
| Clock | Integrated real-time clock |
| Display | LCD with navigation buttons |
| Communication | Via extension modules |
| Program Memory | 240 lines ladder / 500 blocks FBD |
| Measurement Range | Voltage sensing 100-240V AC |
| Frequency Response | 50/60 Hz |
| Sensitivity | Input threshold set for 100-240V AC signals |
| Linearity | Stable timing and logic execution |
| Resolution | Program resolution 240 ladder lines |
| Temperature Range | -20 to 55 °C operating |
| Environmental Resistance | Industrial DIN rail cabinet use |
| Noise Immunity | Designed for industrial control panels |
| Mounting | 35 mm DIN rail |
| Dimensions | 90 × 71.2 × 59.5 mm |
| Weight | 0.25 kg |
| Mechanical Life | 10,000,000 cycles relay output |
| Electrical Life | 500,000 cycles, AC-12, 230V 1.5A, IEC 60947-5-1 |
Installation Guide
- Snap the unit onto a 35 mm DIN rail.
- Keep enough space for wiring and heat flow.
- Connect supply to the 100-240V AC terminals.
- Wire inputs with the correct AC voltage.
- Use relay outputs within the 8 A limit.
- Tighten terminals to the recommended torque.
- Check polarity and circuit protection first.
Commissioning and Maintenance
Program the relay with the LCD and buttons. Use ladder or FBD as needed. The real-time clock enables scheduled tasks. Monitor I/O states on screen during tests. Maintenance is simple. Inspect terminals, clean the display, and verify output contacts. No special tools are required for daily checks. For deeper diagnostics, connect compatible extension modules.
Compatibility
- Works with Zelio Logic expansion modules.
- Fits standard 35 mm DIN rail systems.
- Suits panels using 100-240V AC control voltage.
- Replaces similar compact smart relays in legacy systems.
Certifications and Standards
- Relay output life rated to IEC 60947-5-1.
- Industrial control panel design practice.
- Schneider Electric quality and safety standards.
Package List
- 1 × SR2B121FU smart relay
- 1 × product documentation
- Protective packaging for transit
Warranty and Shipping
Every unit includes a 12-month warranty. We test and verify before shipment. Shipping options include FedEx, UPS, and DHL. Tracking is provided for every order.
Typical Applications
- Small machine control
- Lighting and building automation
- Pumping and water treatment
- HVAC and ventilation logic
- Conveyor and gate control
- Retrofit of obsolete relay panels
Diagnostic Capability
The LCD screen shows I/O status in real time. Users can force outputs and monitor inputs during setup. The real-time clock helps trace timed events. Faulty logic is easy to spot with block or ladder display. This speeds up troubleshooting and cuts downtime.
FAQ
Q: What is the supply voltage?
A: 100-240V AC, 85-264V, 50/60 Hz.
Q: How many outputs does it have?
A: Four relay outputs, 8 A each.
Q: Does it have a clock?
A: Yes, an integrated real-time clock.
Q: Can it talk to other modules?
A: Yes, through Zelio Logic extension modules.
Q: What is the warranty?
A: 12 months.
Q: How do you ship?
A: FedEx, UPS, and DHL.
Contact Information
Inquiries: info@oiltechcontrols.com
Phone / WhatsApp: +86 158 8020 0923
Copyright © 2026 Oiltech Controls Limited. All rights reserved.
Original Source: https://www.oiltechcontrols.com/
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