Johnson Controls C550SCN-1 System 550 Relay Expansion Module

The Johnson Controls C550SCN-1 is a relay expansion module designed for use with the System 550 modular electronic control system. This expansion module adds two additional SPDT (Single Pole Double Throw) relay outputs to System 550 control assemblies, enabling expanded control capabilities for commercial HVACR applications.

Key Features:

• Two additional relay outputs for expanded system control
• Compatible with C550ACN and other System 550 control modules
• Enables up to ten total outputs when combined with control and additional expansion modules
• Modular design allows for customized system configuration
• Supports relay and analog output combinations
• DIN rail or surface mounting options

The C550SCN-1 expansion module integrates seamlessly with System 550 control modules to provide additional relay outputs for controlling heating, cooling, ventilation, and other HVACR equipment. This modular approach allows system designers to specify only the outputs needed for their specific application, reducing costs while maintaining flexibility. The module is particularly useful for multi-stage control applications requiring additional relay switching capacity beyond the base control module outputs.

Application Notes: System 550 modules are not backward compatible with legacy System 350 modules. When replacing System 350 components, all modules in the assembly must be replaced with System 550 equivalents. The C550SCN provides expansion capabilities for applications requiring additional on/off control stages.