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The Trane CNT3781 is a precision-engineered 180F CO Auto Limit Switch designed for high-reliability thermal protection in commercial and industrial HVAC systems
Corrosion Resistance: The high-impact plastic construction eliminates the risk of rust and localized pitting commonly found in older metallic pans
and low-pressure steam applications up to 15 psi
For higher temperature steam
Industrial Build Quality: The 48 frame configuration provides the structural rigidity required for long-term outdoor exposure and vibration resistance
Marley Engineered Products 4520-2025-000 High Limit 321894-708 The Trane CNT3781 is aFor service technicians maintaining Marley high output heating systems, the Marley Engineered Products 4520 2025 000 High Limit is a critical safety component designed for open on rise circuit protection. This SPST (Single Pole Single Throw) limit switch is engineered to trip and interrupt the heating circuit when temperatures reach 180F, preventing heat exchanger damage and potential fire hazards. As an automatic reset control, it restores continuity
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