Programmable Relay MODULE 100-240V I/O 26

The Schneider Electric Zelio Logic SR3B261FU is a modular programmable relay designed to automate machines, installations, and simple processes without the need for a more complex PLC. It operates with a 100 to 240 V AC power supply and includes a total of 26 inputs and outputs, distributed across 16 digital inputs and 10 relay outputs, as well as an LCD display, internal clock, and front keys for programming, parameter setting, and diagnostics.

Its modular design allows the number of inputs and outputs to be expanded using compatible Zelio Logic extensions, reaching up to 40 I/O. The SR3B261FU can be programmed in both Ladder language and FBD function blocks, making it suitable for lighting automation, pumps, ventilation, small machines, control systems, and other simple automation applications.

26 integrated inputs and outputs

The SR3B261FU reference includes as standard 16 digital inputs and 10 relay outputs. The inputs work with 100 to 240 V AC signals, so they can receive signals directly from pushbuttons, limit switches, pressure switches, thermostats, and other compatible devices.

The 10 outputs are normally open relay contacts and can control AC or DC loads within the limits specified by Schneider Electric.

• Total number of I/O: 26.
• Digital inputs: 16.
• Input voltage: 100-240 V AC.
• Outputs: 10 relay outputs.
• Contact type: normally open.
• 8 outputs: maximum thermal current of 8 A.
• 2 outputs: maximum thermal current of 5 A.

100 to 240 V AC power supply

The programmable relay is designed to operate with a rated supply voltage of 100 to 240 V AC at 50/60 Hz. The range accepted by the manufacturer extends approximately from 85 to 264 V AC, making it suitable for use on different electrical networks.

The specified consumption is approximately 12 VA without expansion modules and can reach 17 VA when compatible extensions are used.

Ladder and FBD programming

The Schneider Electric Zelio Logic SR3B261FU supports two programming languages designed to simplify the creation of automation systems:

• Ladder: up to 240 lines of control diagram.
• FBD: up to 500 lines or blocks of control diagram.

Ladder language is especially intuitive for professionals accustomed to relay electrical schematics, while FBD allows automation to be developed using functional blocks and graphical relationships between inputs, outputs, timers, counters, and other functions.

Programming can be carried out using Zelio Soft 2 software and compatible Schneider Electric connection accessories.

LCD display and front controls

The SR3B261FU incorporates a backlit LCD display with 4 lines and 18 characters, along with six front keys for programming and parameter adjustment.

The display allows you to view program information, input and output states, internal values, and diagnostic messages. This facilitates both initial commissioning and later checking and maintenance tasks.

Integrated clock for time-based automation

The unit features an internal clock, allowing programs based on schedules or calendars to be developed without adding an external time switch in certain applications.

Schneider Electric specifies an approximate clock drift of 6 seconds per month at 25 °C and up to 12 minutes per year within the 0 to 55 °C range.

Memory backup of up to 10 years

The program and device data are stored in non-volatile memory. Schneider Electric indicates a backup time of up to 10 years at 25 °C, facilitating recovery after a power interruption.

The stored program is checked each time the programmable relay is powered on.

Expandable up to 40 inputs and outputs

As a modular model in the Zelio Logic range, the SR3B261FU can be combined with compatible discrete I/O expansion modules. Schneider Electric offers 6, 10, and 14 I/O extensions, allowing a maximum of 40 inputs and outputs depending on the selected configuration.

The expansion modules used with this version must be compatible with the programmable relay power supply.

Relay outputs for different load types

The integrated outputs allow switching AC and DC loads within the limits established by the manufacturer:

• AC output voltage: 24-250 V AC.
• DC output voltage: 5-30 V DC.
• Thermal current: 8 A on 8 outputs.
• Thermal current: 5 A on 2 outputs.
• Mechanical durability: up to 10 million cycles.

The effective switching capacity depends on voltage, load type, and utilization category, so Schneider Electric’s electrical characteristics table must always be respected.

Cycle time of 6 to 90 ms

The program cycle time ranges from 6 to 90 ms, depending on complexity and the language used. This performance makes it possible to manage numerous sequential and logical automation tasks commonly found in small machines and installations.

DIN rail mounting

The Zelio Logic SR3B261FU has a compact format designed for 35 mm DIN rail mounting. It also supports fastening with retractable lugs, providing flexibility for integration into electrical panels.

Connections are made using screw terminals, with conductor cross-sections of up to 2.5 mm² depending on the cable type used. The specified tightening torque is approximately 0.5 Nm.

Protection and environmental conditions

The device has IP40 protection on the front panel and IP20 on the terminals according to IEC 60529, so it is intended to be installed inside a suitable enclosure or panel.

• Operating temperature: -20 to 55 °C.
• In a non-ventilated enclosure: -20 to 40 °C.
• Storage temperature: -40 to 70 °C.
• Maximum relative humidity: 95% non-condensing.
• Operating altitude: up to 2000 m.
• Pollution degree: 2.

Technical specifications of the Schneider Electric SR3B261FU

• Brand: Schneider Electric.
• Reference: SR3B261FU.
• Range: Zelio Logic.
• Type: modular programmable relay.
• Total number of I/O: 26.
• Digital inputs: 16.
• Outputs: 10 relay outputs.
• Analog outputs: no.
• Integrated analog inputs: no.
• Power supply: 100-240 V AC.
• Supply limits: 85-264 V AC.
• Frequency: 50/60 Hz.
• Consumption: 12 VA without extension.
• Consumption with extensions: up to 17 VA.
• Digital input voltage: 100-240 V AC.
• Input current: 0.6 mA.
• Input impedance: 350 kΩ.
• Output type: NO relay contacts.
• Output thermal current: 8 A on 8 outputs and 5 A on 2 outputs.
• AC output voltage: 24-250 V.
• DC output voltage: 5-30 V.
• Programming languages: Ladder and FBD.
• Programming capacity: up to 240 Ladder lines and 500 in FBD.
• Cycle time: 6-90 ms.
• Display: backlit LCD.
• Clock: integrated.
• Memory backup: up to 10 years at 25 °C.
• Expansion: up to 40 I/O with compatible discrete modules.
• Mounting: 35 mm DIN rail or lug fastening.
• Connection: screw terminals.
• Maximum conductor cross-section: up to 2.5 mm² depending on type.
• Tightening torque: 0.5 Nm.
• Impulse withstand voltage: 4 kV.
• Front protection rating: IP40.
• Terminal protection rating: IP20.
• Mechanical durability of outputs: up to 10 million cycles.
• Operating temperature: -20 to 55 °C.
• Weight: approximately 0.4 kg.
• EAN: 3389110550009.

Applications of the Zelio Logic programmable relay

The Schneider Electric SR3B261FU is suitable for simple automation tasks that require multiple input and output signals but do not justify the use of a more complex PLC. It can be used to control pumps, fans, lighting, doors, small conveyors, machine sequences, HVAC, and other automatic systems.

The combination of 26 I/O, universal 100-240 V AC power supply, LCD display, clock, Ladder/FBD programming, and expandability up to 40 I/O makes the Zelio Logic SR3B261FU a flexible solution for small machine automation and control panels.