Basler Electric 90-73900-102 Power Supply (Westinghouse 2374A07G03)

The Basler Electric 90‑73900‑102 is a regulated DC power supply designed to replace the Westinghouse 2374A07G03 unit in many legacy protection and control panels. It converts an AC input (typically 120 or 240 VAC) into a stable DC output for powering relays, contactors, and electronic controls. With identical mounting dimensions and terminal connections, it offers a seamless retrofit solution, extending the service life of existing switchgear.

Electrical Specifications

Input voltage: 100‑240 VAC, 50/60 Hz. Output voltage: 24 VDC (nominal), adjustable ±10%. Output current: up to 5 A (120 W). The unit features tight regulation (<±1%) and low ripple (<50 mV). Built‑in input fuse and output over‑current protection ensure safe operation. An LED indicator shows output presence.

Design and Compatibility

The mechanical form factor matches the Westinghouse original, including the same hole pattern and connector positions, allowing direct replacement without panel modification. The terminal block uses the same numbering scheme, simplifying wiring. The unit is compatible with all Basler Electric relays and many other DC‑powered devices.

Protection and Reliability

This power supply includes over‑voltage clamping, short‑circuit protection, and thermal shutdown. It is designed for continuous duty at 50°C ambient without derating. The unit uses high‑grade electrolytic capacitors and a robust transformer for long‑life performance. A surge suppressor protects against transients on the input line.

Applications

Ideal for retrofitting in aging substations, power plants, and industrial facilities, this power supply ensures reliable operation of protection relays, annunciator panels, and control circuits. It is also used in railway signaling and process automation systems where a proven replacement is needed.

Installation Instructions

Disconnect the old unit, mount the new 90‑73900‑102 using the existing hardware, and reconnect the wires per the labelled terminals. No additional software or configuration is required. After energizing, verify the output voltage with a multimeter. The unit is maintenance‑free.

Quality Assurance

Basler Electric manufactures this power supply under strict quality control, ensuring compliance with applicable safety standards (UL, CSA, CE). Each unit is tested for full load operation and dielectric strength. With a MTBF of over 80,000 hours, it provides dependable service for years.

Conclusion

The Basler Electric 90‑73900‑102 power supply offers a reliable, cost‑effective replacement for the Westinghouse 2374A07G03. Its exact form‑fit‑function design simplifies upgrades, while its robust performance ensures uninterrupted operation of critical control systems.