Introduction

The Schneider SR2E121FU Smart Relay Module is a compact programmable controller from the Zelio Logic series, developed for automation applications requiring simple configuration, reliable control, and efficient installation. Designed with integrated relay outputs, clock functionality, and flexible programming options, it provides an effective alternative to conventional relay-based control systems.

With support for ladder logic and function block diagram programming, the SR2E121FU enables engineers to build customized automation sequences for standalone machines and facility systems. Its compact DIN-rail design and broad AC voltage compatibility make it a versatile solution for industrial and commercial control applications.

Technical Specifications

Parameter	Specification
Product Type	Compact Smart Relay Module
Model Number	Schneider SR2E121FU
Manufacturer	Schneider Electric
Product Family	Zelio Logic
Power Supply Voltage	100–240 V AC
Supply Voltage Range	85–264 V AC
Supply Frequency	50/60 Hz
Number of Digital Inputs	8
Input Type	Discrete Input
Input Voltage	100–240 V AC
Number of Relay Outputs	4
Output Type	Relay
Integrated Clock	Yes
Local Display	No
Programming Languages	Ladder Logic / Function Block Diagram
Ladder Program Capacity	Up to 240 lines
FBD Program Capacity	Up to 500 blocks
Cycle Time	6–90 ms
Memory Backup	Approx. 10 years at 25°C
Maximum Supply Current	30 mA at 240 V / 80 mA at 100 V
Power Consumption	Approx. 7 VA
Mounting Type	DIN Rail Mount
Operating Temperature	-20°C to +55°C
Protection Rating	IP20
Dimensions	Approx. 107.6 × 71.2 × 59.5 mm
Weight	Approx. 0.22 kg

Recommended Companion Models

Model	Product Name
Schneider SR2E121BD	Zelio Logic Compact Smart Relay 12 I/O 24 VDC Module
Schneider SR2E201FU	Zelio Logic Compact Smart Relay 20 I/O 100–240 V AC Module
Schneider SR3B261FU	Zelio Logic Modular Smart Relay 26 I/O 100–240 V AC Module
Schneider SR3XT101FU	Zelio Logic Digital Expansion Module

Frequently Selected Alternatives

Model	Product Name
Schneider SR2E121B	Zelio Logic Compact Smart Relay 12 I/O 24 V AC Module
Schneider SR2D101FU	Zelio Logic Compact Smart Relay 10 I/O 100–240 V AC Module
Schneider SR2D201FU	Zelio Logic Compact Smart Relay 20 I/O 100–240 V AC Module
Schneider TM221C16R	Modicon M221 Compact PLC Controller

Where It Excels in Industrial Use

• Designed for compact automation systems requiring programmable control with high-voltage AC power input, integrated timing functions, and reliable relay switching performance.

• Suitable for building automation, lighting management, pump control, ventilation systems, small machinery, and OEM equipment requiring independent logic control.

• Provides a practical replacement for traditional relay circuits by combining programmable functions, clock scheduling, and compact DIN-rail installation within the Schneider Electric Zelio Logic platform.

Key Strengths at a Glance

• Features a Zelio Logic compact smart relay design with 100–240 V AC power supply, 8 discrete inputs, and 4 relay outputs for flexible small-scale automation control.

• Includes an integrated clock function, enabling time-based control sequences, scheduled operations, and automatic switching applications without additional timing devices.

• Supports ladder logic and function block diagram programming with up to 240 ladder lines and 500 FBD blocks, providing flexible application development for engineers and technicians.

Technical FAQs

Q1: What is the primary function of the Schneider SR2E121FU?

The Schneider SR2E121FU is a Zelio Logic compact smart relay designed to execute programmable control functions for small industrial and commercial automation applications.

Q2: Which Schneider Electric product family does the SR2E121FU belong to?

The SR2E121FU belongs to the Zelio Logic smart relay family, which provides compact programmable control solutions for simple automation tasks.

Q3: What type of power supply does the SR2E121FU require?

The SR2E121FU operates with a 100–240 V AC power supply, making it suitable for installations using standard industrial and commercial AC voltage systems.

Q4: How many inputs and outputs are available on the SR2E121FU?

The module provides 8 discrete inputs and 4 relay outputs, offering 12 integrated I/O points for compact automation applications.

Q5: Does the SR2E121FU include an integrated clock function?

Yes, the SR2E121FU includes a built-in clock function for scheduled control operations and time-dependent automation sequences.

Q6: What programming methods are supported by the SR2E121FU?

The SR2E121FU supports ladder logic programming and function block diagram programming, allowing users to develop control applications according to project requirements.

Q7: What type of outputs are used in the SR2E121FU?

The SR2E121FU uses relay outputs, providing flexible switching capability for different industrial loads within rated operating limits.

Q8: Can the SR2E121FU retain programs after power interruption?

Yes, the module includes EEPROM memory backup, allowing stored programs and data to be retained for approximately 10 years under specified conditions.

Q9: Which software is used to configure the SR2E121FU?

The SR2E121FU can be configured using Schneider Electric Zelio Soft programming software for creating, testing, and transferring automation programs.

Q10: What applications commonly use the SR2E121FU?

The SR2E121FU is commonly applied in lighting control systems, small machines, building automation, pump management, and simple industrial monitoring applications.

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