Johnson Controls PSMN40A24DS Power Supply

The Johnson Controls PSMN40A24DS is a heavy-duty, track mount linear DC power supply engineered for reliable performance in demanding HVAC and industrial control environments. This 120 Vac to 24 Vdc power supply provides a stable 1-amp output, making it an essential component for powering sensitive controllers, sensors, and actuators that require isolated DC voltage. Built with a 2-position on/off toggle switch, it allows technicians to safely disconnect power during field maintenance without disrupting the entire control cabinet. Its linear design ensures exceptionally low ripple voltage (0.0016%), preventing signal interference in high-precision automation circuits. The unit features integrated electrical and thermal overload protection with an auto-reset function, ensuring system uptime even during transient faults. Designed for versatility, the PSMN40A24DS comes with a standard 2.75-inch mounting track and is UL Class 2 listed, meeting strict safety standards for commercial building installation. Whether you are performing a retrofit or a new build, this power supply provides the regulated 24V DC needed for consistent device communication.

Key Benefits for HVACR Contractors:

• High Isolation Security: Provides 3000 Vac isolation between input and output to protect expensive downstream controllers from line noise.
• Maintenance Ready: The integrated 2-position on/off switch and LED status indicator allow for rapid troubleshooting and safe component replacement.
• Precision Power: Linear regulation delivers a clean 24 Vdc output with minimal electrical noise, ideal for analog sensors.
• Durable Construction: Operates in extreme environments from -30 to 140° F, suitable for unconditioned mechanical rooms.
• Snap-In Installation: Includes MT212-6 mounting track for fast high-density cabinet mounting.

Common Questions:

Is the PSMN40A24DS suitable for Class 2 circuits?
Yes, this unit is UL Class 2 listed (UL916 and UL5085-3), ensuring it meets the power limitation requirements for safe NEC-compliant control wiring.

Can I use this power supply to drive multiple actuators?
The PSMN40A24DS provides a steady 1 Amp (1000mA) output. You should calculate the total VA or amperage draw of your connected devices to ensure it does not exceed the 1A rating.

What happens if there is a short circuit on the secondary side?
The unit is equipped with internal overload protection. It will automatically reset once the thermal or electrical fault is cleared, preventing permanent damage to the power supply.

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.