Schneider Electric (Barber Colman) 2353-502 Relay

The Schneider Electric (Barber Colman) 2353-502 is a robust Pneumodular Diverting Relay designed for heavy-duty switching and interlocking in pneumatic control systems. This snap-acting, positive two-position device is engineered to convert proportional pneumatic signals into definitive outputs for final control elements. With an adjustable set point range of 4 to 20 psig and a fixed 3.0 ± 0.1 psig differential, it provides precise airflow management in VAV systems and air handling units. The 2353-502 is the direct replacement for the legacy AK-50301, offering seamless integration into existing 22-120 TAC Pneumodular manifolds. When the input signal is below the set point, ports NO and C are connected; once the signal rises above the set point, the relay shifts to connect ports NC and C. Built for professional HVACR environments, it handles a maximum air pressure of 30 psig and operates reliably in ambient temperatures up to 140°F.

• Versatile Signaling: Efficiently handles feeding/exhausting branch lines or diverting supply air between two separate lines.
• Drop-In Compatibility: Serves as a direct engineering replacement for the AK-50301, minimizing downtime during retrofits.
• Precise Control: Features a high-accuracy 3.0 psig differential to prevent rapid cycling and ensure stable pneumatic relay performance.
• Modular Hardware: Designed for standard Pneumodular manifold mounting or surface mounting with an optional bracket for flexible field installation.
• High Capacity: Supports air capacities up to 60 SCFH with low air consumption, optimizing system efficiency.

What is the maximum operating pressure for this relay?
The unit is rated for an operating main air pressure between 15 to 25 psig, with a maximum limit of 30 psig.

Can the differential be adjusted in the field?
No, the 3.0 psig differential is factory-calibrated for precision and is non-adjustable to ensure consistent snap-acting performance.

In what orientation should this relay be mounted?
The 2353-502 utilizes a modular design that allows for proper operation when mounted in any position, provided the control air is clean, dry, and oil-free.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.