Built to withstand the rigorous demands of HVAC repair professionals

Key Benefits for Contractors: System Reliability: The liquid-filled sensing bulb ensures the Johnson Controls A19 series maintains calibration regardless of the ambient temperature surrounding the control case

non-programmable 24V thermostat engineered for contractors needing a reliable interface for single-stage heating and cooling systems

For panel installations

Broad Compatibility: Native support for Johnson Controls A421

Siemens Industrial Controls 3RH2911-1HA30 Contact 328140-751 Built to withstand the rigorousThe Siemens Sirius 3RH2911 1HA30 is a high reliability, front mounted auxiliary switch block engineered for seamless integration with SIRIUS 3RT2 power contactors and 3RH2 contactor relays. This 3 pole module features 3 Normally Open (N O) contacts, providing essential feedback signals for PLCs, status indicators, or interlocking logic in complex control circuits. Designed for rigorous industrial environments, it supports a wide voltage range