Introduction

The Schneider SR3B261B Modular Smart Relay Module is a high-flexibility control solution from the Zelio Logic family, developed for applications requiring more I/O capacity and advanced programmable functions. With 24 I/O points, 24 V AC power operation, integrated display, and clock functionality, it provides an efficient solution for machine automation, facility control, and industrial equipment applications.

Designed for engineers, OEM manufacturers, and system integrators, the SR3B261B combines easy programming with dependable industrial performance. Its modular architecture enables flexible system expansion while maintaining a compact installation footprint, making it a practical choice for automation projects requiring reliable control and future scalability.

Technical Specifications

Parameter	Specification
Brand	Schneider Electric
Model Number	SR3B261B
Product Type	Modular Smart Relay Module
Product Range	Zelio Logic
Module Type	Smart Relay Module
Power Supply Voltage	24 V AC
Supply Voltage Range	20.4...28.8 V AC
Total I/O Points	24
Number of Inputs	16 Discrete Inputs
Number of Outputs	10 Relay Outputs
Programming Method	Ladder Logic / Function Block Diagram
Display	Integrated Display
Clock Function	Available
Memory Type	EEPROM Backup Memory
Program Capacity	Up to 240 Ladder Lines / 500 FBD Lines
Cycle Time	6...90 ms
Mounting Type	DIN Rail Mounting
Operating Temperature	0...55°C
Dimensions (W × H × D)	124.6 × 90 × 59.5 mm
Weight	Approx. 400 g

Recommended Companion Models

Model	Product Name
SR3B262BD	Schneider Zelio Logic Modular Smart Relay Module
SR3B101FU	Schneider Zelio Logic Modular Smart Relay Module
SR2MEM02	Schneider Zelio Logic EEPROM Memory Module
SR2USB01	Schneider Zelio Logic USB Programming Cable

Frequently Selected Alternatives

Model	Product Name
SR3B261BD	Schneider Zelio Logic Modular Smart Relay Module 24 V DC
SR3B262B	Schneider Zelio Logic Modular Smart Relay Module
SR2E201FU	Schneider Zelio Logic Compact Smart Relay Module
SR2B201FU	Schneider Zelio Logic Compact Smart Relay Module

Where It Excels in Industrial Use

• Advanced Machine Automation Control
The SR3B261B is designed for larger compact automation applications requiring expanded I/O capability, reliable logic processing, and flexible control functions for industrial equipment.

• Building and Infrastructure Automation
Suitable for lighting systems, HVAC control, pumping applications, and facility management solutions that require programmable scheduling and monitoring functions.

• OEM Equipment Development
Provides machine builders with a versatile control platform for customized automation projects where modular expansion and dependable operation are essential.

• Process Monitoring and Control Systems
Supports applications requiring multiple input signals, relay outputs, timing functions, and local interface operation for efficient system management.

Key Strengths at a Glance

• Expanded I/O Capability
The SR3B261B provides 24 I/O points, offering greater flexibility than compact smart relay models for more demanding automation applications.

• Integrated Display and Clock Functions
The built-in display and clock functions enable convenient local monitoring, parameter adjustment, and time-based automation control.

• Reliable Program Backup Memory
Built-in EEPROM memory provides long-term program retention, helping simplify system recovery after unexpected power interruptions.

• Flexible Modular Expansion Design
The Zelio Logic modular architecture allows additional expansion modules to be integrated for increased system functionality.

Technical FAQs

1. What type of controller is the Schneider SR3B261B?
The Schneider SR3B261B is a Zelio Logic modular smart relay designed for programmable automation control applications.

2. What power supply voltage does the SR3B261B require?
The SR3B261B operates with a 24 V AC power supply and supports a rated voltage range of 20.4 to 28.8 V AC.

3. How many inputs and outputs does the SR3B261B provide?
The SR3B261B provides 16 discrete inputs and 10 relay outputs for automation control applications.

4. Which programming methods are supported by the SR3B261B?
The SR3B261B supports ladder programming and function block diagram programming for flexible application development.

5. Does the SR3B261B include a display interface?
Yes, the SR3B261B includes an integrated local display for monitoring and configuration operations.

6. Can the SR3B261B store programs after power loss?
Yes, the smart relay includes EEPROM backup memory designed to retain user programs during power interruptions.

7. Can the SR3B261B support expansion modules?
Yes, the modular Zelio Logic design allows compatible expansion accessories to extend system capabilities.

8. What software is used to program the SR3B261B?
The SR3B261B can be programmed using Schneider Electric Zelio Soft programming software.

9. What type of outputs are available on the SR3B261B?
The SR3B261B uses relay outputs suitable for switching industrial loads within the specified electrical ratings.

10. How does the SR3B261B improve automation system design?
The SR3B261B combines programmable logic, expanded I/O capacity, and modular functionality to simplify the development of customized automation solutions.

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