Schneider SR2B121FU Zelio Logic Smart Relay 12 IO 100-240V AC Clock

The Schneider Electric SR2B121FU is a compact programmable relay from the Zelio Logic range, offering 12 I/O with a 100-240 V AC supply, a built-in real-time clock, and a local display. Designed for small automation tasks, it supports both Ladder and FBD programming with cycle times of 6-90 milliseconds.

Technical specifications:

• Commercial reference: SR2B121FU
• Manufacturer: Schneider Electric
• EAN:
• Series / range: Zelio Logic
• Product type: Compact programmable relay
• Rated supply voltage: 100-240 V AC
• Supply voltage range: 85-264 V
• Supply frequency: 50/60 Hz
• Power consumption: 7 VA (without extension)
• Number of digital inputs: 8 (100-240 V AC, 0.6 mA)
• Number of analog inputs: 0
• Number of outputs: 4 relay (NO contacts)
• Output thermal current: 8 A for all 4 relay outputs
• Output voltage range: 5-30 V DC / 24-250 V AC (relay output)
• Rated impulse withstand voltage: 4 kV per IEC 60947-1
• Isolation voltage: 1780 V
• Mechanical durability: 10,000,000 cycles (relay output)
• Built-in clock: Yes
• Local display: Yes
• Programming: Ladder (up to 240 lines) and FBD (up to 500 lines)
• Memory retention: 10 years at 25°C
• Connection type: Screw terminals, 0.2-2.5 mm²
• Tightening torque: 0.5 N.m
• IP rating: IP20 (terminal block) / IP40 (front panel) per IEC 60529
• Operating temperature: -20 to 55°C
• Storage temperature: -40 to 70°C
• Pollution degree: 2 per IEC 61131-2
• Operating altitude: 2000 m
• Product weight: 0.25 kg
• Certifications: UL, CSA, GL, GOST, C-Tick

Features and benefits:

• Built-in real-time clock with drift of just 6 seconds per month at 25°C, enabling time-based control without an external module
• Dual programming support (Ladder and FBD) for flexible logic design suited to various automation tasks
• Wide AC input voltage range (85-264 V) provides resilience against supply fluctuations
• Relay outputs rated 8 A with 500,000 electrical cycles ensure long service life under resistive and inductive loads
• Micro-interruption resistance of 10 milliseconds protects against brief supply interruptions
• Compact design with local display simplifies on-site commissioning and diagnostics

Applications:

• Time-scheduled control of lighting, HVAC, or ventilation systems in commercial buildings
• Small machine automation requiring straightforward relay-based logic control
• Pump or motor sequencing in industrial and building services installations
• Access control or gate automation with time-based switching

Compliant with IEC 61131-2, IEC 61000-6-2, IEC 61000-6-4, and IEC 60947-1. Part of the Schneider Electric Zelio Logic range.

Also known as: Schneider SR2B121FU, Schneider Electric SR2B121FU, Zelio Logic compact smart relay, Schneider 12 I/O programmable relay.