Schneider Electric (Barber Colman) 2354-503 Relay

The Schneider Electric (Barber Colman) 2354-503 Relay is a precision pneumatic diverting relay designed for high-reliability switching and interlocking in complex pneumatic control systems. As a DPDT switching relay, this snap-acting device is engineered to handle multiple pneumatic logic functions, including diverting supply lines or feeding and exhausting branch lines based on signal pressure. Techs frequently utilize this model in HVAC pneumatic controls to transition between heating and cooling sequences or to interlock dampers and valves in air handling units. With a factory-set 4-8 psig range, the internal snap-acting mechanism ensures positive, crisp switching logic: below 4 psig, the Common (C) ports connect to the Normally Open (NO) ports; above 8 psig, connections shift to the Normally Closed (NC) ports. This eliminates the "flutter" often seen in gradual-acting devices, providing stable pneumatic signal diverting for VAV systems and terminal unit control.

Built for professional-grade installations, the 2354-503 features an air capacity of 60 SCFH and operates at a maximum air pressure of 30 psig. The unit is equipped with barbed nipples compatible with both 1/4" O.D. and 5/32" I.D. tubing, allowing for a secure fit in various field configurations. This pneumodular relay is frequently mounted using a 22-120 manifold socket for clean panel layouts but can also be field-mounted using the included adhesive-backed base and plastic straps. When integrating the Barber Colman 2354-503 into an existing pneumatic control circuit, always ensure the use of clean, dry, oil-free control air to maintain the integrity of the non-metallic diaphragm and internal switching contacts.

• DPDT Switching Versatility: Dual-pole, double-throw configuration allows for simultaneous switching of two separate pneumatic circuits.
• Snap-Acting Mechanism: Prevents signal hunting or gradual air leakage during transitions by providing a fast, positive switchover.
• High Capacity: 60 SCFH air capacity ensures rapid response for large actuators or long tubing runs.
• Flexible Mounting: Compatible with manifold sockets or surface mounting using the included mounting hardware for faster field replacements.

What is the switching logic of the 2354-503?
The relay remains in the "Normally Open" position (C to NO) when the signal pressure is below 4 psig. Once the input signal exceeds 8 psig, the internal mechanism snaps to the "Normally Closed" position (C to NC).

Can this relay be mounted in any orientation?
Yes, the 2354-503 is designed to operate effectively in any mounting position within a pneumatic panel or field enclosure.

What type of tubing is required for the barbed ports?
The barbed nipples are designed for 1/4" O.D. polyethylene or 5/32" I.D. polyurethane tubing, providing a tight friction fit for standard control lines.

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.