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Compact transparent logic relay with LCD display

Schneider Electric

Schneider Electric SR2B121BD Logic Relay 24V AC/DC 12 In 4 Out

SKU CH-M614-XRGYH

Compact smart relay with 12 inputs, 4 relay outputs, 16 timers, 16 counters, clock and LCD display for 24 V AC/DC control

  • Product typeIndustrial Electrical Controls & Automation
  • Product colorTransparent
  • 12 digital inputs for flexible sensing
  • 4 relay outputs rated at 8 A each
  • 16 timers and 16 counters for sequencing
  • Built-in clock with LCD display for local monitoring
  • Operates on 24 V AC/DC supply voltage

Compact Smart Relay for 24 V Automation

The Schneider Electric SR2B121BD is a compact smart relay designed for 24 V AC/DC control circuits. It provides twelve discrete inputs and four relay outputs rated at 8 A each. The unit includes an integrated LCD display and a real-time clock for local status and scheduling.

Sustained Logic Execution with Onboard Resources

Sixteen counters and sixteen timers handle repetitive sequencing without external PLC modules. The relay outputs switch resistive and inductive loads directly, reducing intermediate contactor count. Program logic runs continuously in the internal processor, maintaining state across power cycles thanks to the battery-backed clock.

Panel-Mount Enclosure with Front-Facing Interface

The transparent housing measures 2.8 in wide, 4.24 in high and 2.34 in deep, fitting standard DIN-rail cut-outs. Screw terminals on the front accept solid or stranded wire for quick wiring. The LCD and keypad remain accessible after installation, allowing on-site program edits without removing the module.

How it compares

Measured against everything we stock in AV Accessories & Components, at today’s prices. Recalculated every night.

Price $215.99
Pricier than about 88% of the 3,838 comparable items (median $41.99).

Specifications

Product
Brand nameSchneider Electric
Model nameSR2B121BD
Product typeIndustrial Electrical Controls & Automation
Product colorTransparent

Questions about this item

Does the 24 V AC/DC supply generate noticeable heat when the relay runs continuously?

The unit draws 24 V AC/DC and switches up to 8 A per relay output; normal warmth is expected under full load, but no fan or active cooling is fitted.

What wiring and power source must I already have to install this logic relay?

You need a 24 V AC or DC supply, cables for 12 inputs and 4 relay outputs, and a DIN-rail or panel space measuring roughly 2.8 in wide by 4.24 in high by 2.34 in deep.

Can the 12-input, 4-output relay share a 24 V bus with older PLC modules I want to keep?

Yes, the relay operates on the same 24 V AC/DC level and provides isolated relay contacts, so it can sit on a common bus with legacy I/O without signal conflicts.

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