Johnson Controls T-4000-3139 Plastic Cover requiring a replacement like the

requiring a replacement like the 100241

deep oxidation or cracks in the ceramic insulator require a full replacement to ensure the system operates within manufacturer specifications

the 3A @ 277V rating confirms that it can safely handle the 208/240V typically found in Bard HVAC units

Contractors trust this part for its consistent switching capabilities and compatibility with various industrial motor control systems

Johnson Controls T-4000-3139 Plastic Cover requiring a replacement like theThe Johnson Controls T 4000 3139 is a professional grade horizontal pneumatic thermostat cover designed specifically for the T 4000 Series room thermostats. Engineered for demanding commercial environments, this white plastic cover provides a clean, uniform look for horizontal mounted controllers where a blank faceplate cover is required. As a genuine Johnson Controls replacement part, it ensures a precise fit for single or dual element sensing units