Johnson Controls PSMN24DAS Power Supply

The Johnson Controls PSMN24DAS is a non-isolated linear DC power supply designed for precision in commercial HVACR control applications. This track-mount DC power supply efficiently converts a 24 VAC input into a highly stable, adjustable DC voltage output ranging from 1.5 to 28 VDC. For technicians managing building automation systems, this unit provides a reliable 300mA current output, making it ideal for powering sensitive sensors, transducers, and low-voltage controllers that require clean linear power without the high-frequency noise typical of switching supplies.

Engineered for field durability, the PSMN24DAS features a built-in on-off toggle switch for rapid localized maintenance and troubleshooting. Its 2.75-inch mounting track (MT212-2) ensures compatibility with standard control cabinets, while the UL Class 2 certification ensures compliance with strict electrical safety codes. With electrical and thermal overload protection including auto-reset functionality, this 24V linear power supply maintains performance in demanding environments ranging from -30 to 140?F.

Key Benefits

• Precision Voltage Control: Adjustable output from 1.5-28 VDC allows for exact calibration to specific field device requirements.
• Integrated Safety: Features UL Listed Class 2 rating for simplified wiring and enhanced panel safety.
• Serviceability: The manual ON/OFF switch and LED status indicator allow for immediate power isolation and visual diagnostics.
• Compact Installation: Designed for standard 2.75" track mounting, saving critical rail space in dense control enclosures.
• Thermal Protection: Sustains reliable operation across wide temperature swings with an integrated auto-reset thermal fuse.

Common Questions

What is the maximum current rating for this power supply?
The unit is rated for a maximum output of 300 mA, which is sufficient for most low-draw HVAC sensors and small relay logic circuits.

Does this unit provide isolation between the AC input and DC output?
No, the PSMN24DAS is a non-isolated linear power supply. If your application specifically requires galvanic isolation, you should consider the PSM series isolated variants.

Can the output voltage be locked at 24 VDC?
Yes, the output is fully adjustable. While it can be swept from 1.5 to 28 VDC via the onboard potentiometer, it is commonly set and verified at 24 VDC for standard automation components.

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.