Schneider SR2B121BD Zelio Logic Smart Relay 12 I/O

Zelio Logic SR2B121BD 24V DC Compact Smart Relay from Schneider Electric

Product Introduction

The SR2B121BD belongs to the Schneider Electric Zelio Logic range of compact smart relays. This controller offers 12 I/O points in a space-saving design. Specifically, it provides 8 digital inputs and 4 relay outputs. Among the inputs, 4 channels are configurable as analog inputs with 8-bit resolution. Therefore, it handles simple automation tasks without a full PLC. Furthermore, the integrated real-time clock supports time-based control functions. Meanwhile, the LCD screen and navigation buttons simplify on-site programming. Additionally, the SR2B121BD runs on 24V DC and mounts on a 35mm DIN rail. As a result, it suits small machines, lighting control, and building automation.

Technical Specifications

The SR2B121BD delivers solid performance for small control systems. Its key ratings include:

• Number of I/O points: 12

• Digital inputs: 8 (4 configurable as analog inputs, 8-bit resolution)

• Digital outputs: 4 relay

• Relay output current: 8 A thermal current per output

• Supply voltage: 24V DC (19.2–30V)

• Clock: Integrated real-time clock

• Display: LCD with navigation buttons

• Program memory: 240 lines ladder / 500 blocks FBD

The relay outputs handle up to 8A thermal current each. Consequently, they drive contactors, solenoids, and indicator lamps directly. Besides, the analog input option accepts 0–10V signals for simple measurement tasks. For instance, it monitors temperature, pressure, or level sensors. Moreover, communication is possible through extension modules such as Ethernet or RS485. Therefore, the relay can join larger control networks when needed.

Mechanical and Environmental Parameters

The SR2B121BD is built for industrial environments. First, its operating temperature range spans -20 to 55 °C. Next, the mechanical life of the relay output reaches 10,000,000 cycles. In addition, the electrical life reaches 500,000 cycles under AC-12 at 230V and 1.5A. The dimensions measure 90 × 71.2 × 59.5 mm (H×W×D). Meanwhile, the weight is about 0.25 kg. The housing uses durable thermoplastic material. Furthermore, the 35mm DIN rail mount allows quick installation. As a result, maintenance and replacement stay simple.

Installation Guide

Installing the SR2B121BD takes only a few steps. First, switch off the power supply and verify zero voltage. Next, clip the relay onto a 35mm DIN rail until it clicks. Then, connect the 24V DC supply to the dedicated terminals. Besides, wire the inputs and outputs according to your wiring diagram. Moreover, keep signal cables away from power cables to reduce noise. Finally, power up the unit and load your program via the LCD or software. However, always follow local electrical codes during wiring. Therefore, a qualified technician should perform the final commissioning.

Packaging List

• 1 × Schneider Zelio Logic SR2B121BD Compact Smart Relay

• 1 × Product label with model and rating details

• 1 × Carton box with protective packaging

Shipping
We ship worldwide via Fedex, UPS, and DHL. Orders dispatch within 1–2 business days.

FAQ

Q1: What is the supply voltage of the SR2B121BD?
A: It runs on 24V DC with an operating range of 19.2 to 30V. Therefore, it suits standard industrial DC power supplies.

Q2: Can the inputs work as analog channels?
A: Yes. Four of the eight digital inputs are configurable as analog inputs. Hence, they accept 0–10V signals with 8-bit resolution.

Q3: How many outputs does this smart relay have?
A: It provides 4 relay outputs. Each output handles up to 8A thermal current for direct load control.

Q4: Does the SR2B121BD support communication?
A: Yes. It connects to Ethernet or RS485 networks through extension modules. Consequently, it fits distributed control systems.

Q5: Does this product come with a warranty or certificate?
A: The package includes the relay and label only. Please contact us for document requests.