Johnson Controls T-4000-2139 Cover This heavy-duty 120V to 24V

This heavy-duty 120V to 24V step-down transformer is engineered for continuous-duty applications where stable secondary voltage is critical for powering sensors

Rugged Construction: Built with a heavy-duty steel frame and a ladder hook for convenient storage while working at heights

the HH18HA490 is the official updated replacement part designed to meet or exceed the specifications of the HH18HA292

Is this a direct replacement for the 5H54751-40

Johnson Controls T-4000-2139 Cover This heavy-duty 120V to 24VThe Johnson Controls T 4000 2139 is a professional grade horizontal thermostat cover designed specifically for the T 4000 Series pneumatic room thermostats. Engineered for sleek, unobtrusive installation, this beige plastic cover features a clean aluminum faceplate without a thermometer window or setpoint adjustment openings. This configuration is ideal for facilities where unauthorized tampering must be minimized while maintaining a uniform aesthetic