Functional Devices PSMN300A Power Supply

The Functional Devices PSMN300A is a robust 300VA power supply engineered for high-demand Building Automation Systems (BAS) and HVACR control circuits. Featuring a NEMA 1 rated enclosure, this unit converts 120 Vac primary input into 24 Vac secondary output via three independent 100VA Class 2 limited circuits. Each circuit is protected by a 4 Amp circuit breaker, providing essential overcurrent protection for sensitive controllers and actuators. Designed for rapid installation, the sub-panel mounting allows for seamless integration into existing control cabinets. The multi-tap transformer design ensures reliable voltage regulation across all Phase-to-Phase connections. For contractors managing energy management systems, the PSMN300A eliminates the need for multiple smaller transformers, streamlining the low voltage power distribution layout while maintaining strict compliance with electrical safety standards for industrial control equipment. This unit is the professional choice for powering VAV controllers, dampers, and multi-zone heating systems.

• Triple 100VA Outputs: Provides three independent Class 2 circuits to prevent total system failure if a single branch shorts.
• Integrated Circuit Breakers: Manual reset breakers replace traditional fuses, reducing downtime during maintenance or troubleshooting.
• Pre-Wired Configuration: Simplifies wire termination and reduces labor hours during the commissioning phase.
• High VA Rating: Delivers high-capacity 24V power supply performance for large-scale commercial HVAC applications.
• Sub-Panel Mounting: Facilitates a clean, organized control cabinet layout with easy access to all terminal blocks.

How do I handle the secondary grounding for this 300VA power supply?
The secondary common of each 100VA transformer should be bonded to the enclosure ground or the system's common reference point according to local codes and the specific requirements of your DDC controller.

Can I parallel the outputs to get 300VA on a single circuit?
No. The Functional Devices PSMN300A is designed with three separate Class 2 100VA outputs. Paralleling these circuits would void the Class 2 rating and may result in equipment damage or safety hazards.

What is the maximum ambient temperature for the PSMN300A during operation?
This unit is designed for reliable performance in standard mechanical room environments, typically rated for operation between -30 to 140 degrees Fahrenheit, ensuring stability near thermal loads.

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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.