Carrier HR680030 HOA Auxiliary Contact Block HVAC Control Switch Component

The Carrier HR680030 is an OEM auxiliary contact block designed for Hand-Off-Auto (HOA) selector switch assemblies used in commercial HVAC control panels and equipment. This contact block provides the auxiliary switching contacts that allow a control circuit to monitor or signal the current operating position of an HOA selector switch — whether the system is being operated manually (Hand), is shut down (Off), or is under automatic control (Auto).

Key Features:

• Genuine Carrier OEM replacement contact block
• Designed for use with Hand-Off-Auto (HOA) selector switch assemblies
• Auxiliary contact configuration for control circuit monitoring and interlocking
• Supports both normally open (NO) and normally closed (NC) contact signaling
• Built for reliable operation in commercial HVAC and building automation control panels
• Engineered to meet Carrier equipment performance and safety standards

The HR680030 is a direct factory replacement part, ensuring proper fit and function within Carrier commercial HVAC systems. It is commonly found in rooftop units, chillers, air handlers, and other commercial equipment that employ HOA-type selector switch controls. Replacing a worn or failed auxiliary contact block restores proper circuit monitoring and helps maintain reliable automatic and manual control operation.