Functional Devices PSH300A Power Supply

The Functional Devices PSH300A is a commercial-grade 300VA power supply designed to provide reliable, isolated power for building automation and HVAC control systems. This multi-tap unit accepts 120/240 VAC, as well as 277 and 480 VAC primary inputs, converting them into three independent 100VA Class 2 24 VAC outputs. Each secondary circuit is equipped with a dedicated 4A circuit breaker and an On/Off switch, allowing for localized isolation during maintenance without dropping the entire panel. The NEMA 1 metal enclosure ensures durability in mechanical rooms while providing a clean terminal strip interface for 12-26 AWG field wiring. High-visibility LED indicators provide instant status verification for each output, streamlining diagnostics for technicians. This enclosed 24 VAC transformer is UL listed and meets stringent standards for industrial control hardware, making it a standard choice for high-load applications requiring multiple Class 2 power sources.

• Triple 100VA Outputs: Provides 300VA total capacity across three isolated circuits to prevent system-wide shutdowns.
• Universal Input: Supports 120/240/277/480 VAC primaries, making it compatible with most commercial electrical services.
• Integrated Protection: Each output features a manual reset circuit breaker and toggle switch for precise circuit control.
• Rugged Construction: Housed in a heavy-duty NEMA 1 enclosure with finger-safe terminals for enhanced safety.
• Diagnostic Feedback: Individual red LED status lamps allow for rapid troubleshooting of secondary power issues.

Can the PSH300A handle a combination of 120V and 240V inputs?
The unit is multi-tap, meaning you select the specific primary lead for your source voltage (120, 240, 277, or 480 VAC). You cannot connect multiple primary voltages simultaneously.

Are the secondary outputs isolated from each other?
Yes, the PSH300A provides three isolated 100VA secondary outputs, which helps prevent ground loops and isolates faults to a single branch.

Is this power supply suitable for plenum spaces?
The internal sub-panel is plenum rated, but always verify local code requirements regarding the NEMA 1 metal enclosure placement in environmental air spaces.

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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.