Description
The Johnson Controls C450SCN-4C is a relay expansion module designed to extend the output capabilities of the C450 Series electronic controllers. By adding two Single-Pole Double-Throw (SPDT) relay outputs, this module enables technicians and building automation professionals to control additional loads and sequences without replacing existing controller hardware.
Key Features
- 2 SPDT relay outputs for expanded switching capability
- Designed for use with Johnson Controls C450 Series controllers
- Snap-on modular design for quick, tool-free installation
- Ideal for staging, sequencing, and auxiliary load control applications
- Compact form factor fits within standard C450 controller enclosures
Application
The C450SCN-4C expansion module is well-suited for commercial HVAC and building automation applications where additional relay switching outputs are needed. Common uses include staging heating or cooling equipment, controlling auxiliary fans, and managing alarm or alert circuits — all without requiring a separate controller.
Compatibility
- Compatible with Johnson Controls C450 Series electronic controllers
- Works within Johnson Controls building automation and direct digital control (DDC) systems
Product Specifications
- Output Type: 2 x SPDT (Single-Pole Double-Throw) Relay
- Module Type: Expansion / Accessory Module
- Series: C450
- Brand: Johnson Controls
- SKU: C450SCN-4C







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