the 4520-0011-000 is normally closed and should only open when reaching the 300°F set point

Its approval for use with POE oils makes it a standard choice for modern high-efficiency replacements and system retrofits

Rugged Construction: Zinc-plated steel components resist corrosion and mechanical fatigue in high-cycle airflow applications

Because the minimum high-limit setting is 180°F

ensure the valve body and system specs align with the AG series general-purpose ratings

Fenwal 12-E27121-000-03 Sensor Els PW 17895 the 4520-0011-000 is normally closedThe Fenwal 12 E27121 000 03 is a precision engineered Detect A Fire vertical mount thermal sensor designed for rapid response in critical fire suppression and overheat signaling applications. This rate compensated fire detector utilizes a 300 stainless steel shell and a hex brass mounting head to ensure hermetically sealed reliability in harsh environments. Configured as a close on rise thermal switch, it features a factory set activation point of