Others Programmable relays

Programmable relays are compact, versatile control devices that combine the functionality of multiple traditional relays, timers, and counters into a single unit. These intelligent modules are designed for small to medium-scale automation tasks, offering digital and analog inputs/outputs, logic processing capabilities, and communication interfaces. They typically operate at 24V DC or 24-240V AC/DC, with power consumption ranging from 2 to 10W depending on the model and number of I/O points. Common form factors include DIN rail mountable units with 8, 12, or 20 I/O configurations, featuring LCD or LED displays for local programming and monitoring. The logic processing is based on ladder diagram (LD) or function block diagram (FBD) programming, with cycle times in the millisecond range. These devices are often referred to as smart relays, logic controllers, or nano-PLCs in different markets, and they bridge the gap between simple electromechanical relays and full-scale programmable logic controllers.

Programmable relays are extensively used in building automation, HVAC control, lighting management, and small industrial machinery. Typical installations include control panels for conveyor systems, packaging machines, pump stations, and irrigation controllers. They are also found in elevator control, access control systems, and energy management applications. In commercial buildings, they manage lighting schedules, HVAC zone control, and occupancy-based automation. The compact size and low cost make them ideal for distributed control architectures where a full PLC would be overkill. They are particularly suited for applications requiring simple logic, timing sequences, and basic analog signal processing, such as temperature monitoring or level control in tanks.

Within this category, you will find subcategories like basic programmable relays with fixed I/O, expandable modular systems, and high-performance units with integrated HMI. Key article codes often follow a pattern like SR2 B121BD or Zelio Logic SR3 B261BD, where the first digits indicate the series, followed by I/O count and supply voltage. For example, the SR2 B121BD is a 12 I/O smart relay with 24V DC supply, while the SR3 B261BD offers 26 I/O points. Other common codes include LOGO! 12/24RC from Siemens, which follows a similar naming convention with model number and voltage rating. These codes typically include letters for series (SR2, SR3, LOGO!), numbers for I/O count (12, 20, 26), and suffixes for supply type (BD for DC, FU for AC).

Partnering with Electric Automation Network gives you access to a comprehensive inventory of programmable relays from leading manufacturers, with real-time pricing and stock availability. Our engineering team provides personalized technical support for selection, programming, and troubleshooting, ensuring optimal integration into your control systems. We offer express worldwide shipping, with most orders dispatched within 24 hours. Each product listing includes detailed technical documentation, wiring diagrams, and programming software links, enabling you to make informed decisions quickly. Whether you need a simple replacement or a complex automation solution, our specialists are ready to assist.