SR3B261FU Schneider Electric Zelio Logic 26 I/O Smart Relay

When Panel Space and Logic Complexity Collide

An integrator recently faced a familiar problem: a compact control panel needed 26 discrete I/O points, an integrated real-time clock, and analog input capability — all without the footprint of a full PLC. The SR3B261FU from Schneider Electric solves this exact challenge. As part of the Zelio Logic range, this modular smart relay packs 26 I/O points into a DIN-rail-mount housing measuring 90 × 124.6 × 59.5 mm and weighing just 0.30 kg.

SR3B261FU I/O Architecture and Electrical Specifications

The SR3B261FU provides 16 digital inputs, of which 6 are configurable as analog inputs, all rated for 100-240V AC. Ten relay outputs handle switching loads with a 5 A per output rating. The supply voltage range of 85-264V AC at 50/60 Hz accommodates global power standards without external transformers. An integrated real-time clock enables time-based control sequences, while the LCD with navigation buttons allows on-device programming and monitoring.

Key Technical Parameters

• I/O Count: 26 total points (16 inputs, 10 relay outputs)
• Input Voltage: 100-240V AC, 6 inputs configurable as analog
• Output Current: 5 A per relay output
• Supply Voltage: 85-264V AC, 50/60 Hz
• Program Memory: 240 lines ladder / 500 blocks FBD
• Relay Life: 10,000,000 mechanical cycles; 500,000 electrical cycles (AC-12, 230V 1.5A, IEC 60947-5-1)
• Operating Temperature: -20 to 55 °C
• Mounting: 35 mm DIN rail

Relay Output Durability in Demanding Environments

The SR3B261FU relay outputs are rated for 10,000,000 mechanical cycles. Electrical life reaches 500,000 cycles under AC-12, 230V 1.5A per IEC 60947-5-1. This engineering-grade precision in contact design reduces downtime in high-cycle applications. The operating temperature range of -20 to 55 °C supports deployment in unconditioned cabinets and outdoor enclosures.

Integrating the SR3B261FU into Control Systems

Communication with the SR3B261FU occurs via extension modules, allowing expansion of I/O or network connectivity as application requirements grow. The 35 mm DIN rail mounting simplifies installation in standard industrial enclosures. Programming uses ladder logic up to 240 lines or function block diagrams up to 500 blocks, providing flexibility for both electricians and automation engineers.

Availability and Support

The SR3B261FU is active and in production within the Zelio Logic range. AutoDCSTech supplies this smart relay with engineering-grade accuracy in every part. Contact AutoDCSTech with your exact requirements for precise matching.