Auxiliary power supply 24VDC 30W

Overview

The PSA-30W is an ultra-slim DIN rail mounted switching power supply engineered for KNX gateway installations and building automation cabinets. Delivering 30W of reliable 24VDC power in a compact 35mm (2SU) width, this power supply is the ideal companion for Elausys inverter gateways (INV-KNX series), alarm interfaces, and other low-power KNX devices requiring 12-30VDC auxiliary power.

Technical Capabilities

The PSA-30W provides a rated output of 24VDC at 1.5A continuous (36W peak), with voltage adjustability from 21.6 to 29VDC to accommodate various device requirements. Universal input accepts 85-264VAC (277VAC operational) or 120-370VDC, making it suitable for installations worldwide regardless of local grid standards.

High-efficiency operation at 89% typical reduces heat generation and energy waste, while ultra-low no-load power consumption below 0.3W minimizes standby losses. Output regulation maintains tight tolerances with load regulation of 1% and line regulation of 0.5%, ensuring stable voltage delivery even with varying loads. Ripple and noise are held to 150mVp-p maximum, providing clean power for sensitive electronic devices.

The 4kVAC input-to-output isolation and 100M ohm isolation resistance at 500VDC ensure electrical safety and protection of connected equipment. Class II isolation rating meets requirements for industrial and commercial installations without requiring earth ground connection.

Installation and Configuration

DIN rail mounting is compatible with both TS-35/7.5 and TS-35/15 standard rails, enabling straightforward installation in any automation cabinet. The ultra-slim 35mm width occupies only 2 space units (2SU), preserving valuable cabinet space in dense installations.

Wiring connections use screw terminals for both AC input and DC output. The adjustable output voltage trimmer allows fine-tuning between 21.6 and 29VDC without external tools, accommodating devices with varying voltage requirements within a single installation.

Free air convection cooling eliminates the need for forced ventilation in most applications. The wide operating temperature range of -30 to +70C ensures reliable operation in demanding environments including unconditioned technical rooms.

Applications

KNX Gateway Installations: Power Elausys INV-KNX series inverter gateways (SMA-KNX, Fronius-KNX, Huawei-KNX, etc.) and alarm system interfaces that require external DC power. A single PSA-30W can power multiple gateways in the same cabinet.

Building Automation Cabinets: Provide auxiliary DC power for sensors, actuators with logic modules, and communication interfaces that operate independently of the KNX bus voltage.

Industrial Control Panels: Supply 24VDC for PLC inputs, relay modules, and indicator lights in compact control cabinets where space is at a premium.

Commercial Installations: Hotels, office buildings, and retail spaces benefit from the reliable, efficient power delivery for distributed automation equipment.

Compatibility and Integration

The PSA-30W integrates seamlessly with Elausys KNX gateway products including the complete INV-KNX inverter gateway range, alarm system gateways (JA-KNX, EVO-KNX, NXG-KNX), and other devices requiring 12-30VDC auxiliary power. The adjustable output voltage ensures compatibility with devices from various manufacturers.

Protection features include automatic short-circuit shutdown with recovery, over-voltage protection (30-36VDC threshold), over-load current limiting, and thermal shutdown protection. These comprehensive safeguards protect both the power supply and connected equipment from fault conditions.

Certified to industrial standards with Class II isolation and LPS (Limited Power Source) classification, the PSA-30W meets requirements for professional building automation installations throughout Europe and internationally.