Specifications: Parameter Specification Product Range Harmony / Zelio Logic (Smart Relays - SR3 Series) Device Type Compact Smart Relay (Micro PLC with integrated display) Power Supply 100-240V AC, 50/60 Hz (Universal AC supply, as indicated by the "FU" suffix). Built-in Digital Inputs 6 inputs (Typically 24V DC compatible, configurable as sink/source). Built-in Relay Outputs 4 outputs (Relay contacts, SPDT/changeover type). Output Contact Rating 8 A @ 250V AC (resistive load). Integrated Display Text or graphic LCD display with navigation buttons for programming, monitoring, and manual control. Programming Method Directly via the front-panel keypad and display or via PC software (EcoStruxure Machine Expert - Basic). Expansion Capability None ("B" model is non-expandable). For more I/O, a larger model or a modular "D" type must be selected. Communication Typically includes a built-in communication port (e.g., RS-485 for Modbus). Some models may support optional communication modules for Ethernet, etc. Program Memory Sufficient for several hundred lines of ladder logic. Real-Time Clock Usually included for scheduling functions. Mounting DIN Rail (35mm) Operating Temperature -20°C to +60°C (typical) Standards & Approvals UL 508, CSA, IEC/EN 61131-2, CE, RoHS.