MEAN WELL PT-45B 45W Triple Output AC/DC Switching Power Supply, 5V/12V/-12V, Open Frame

Many industrial and embedded systems require a compact, reliable power source that delivers multiple DC voltages from a single AC input. The MEAN WELL PT-45B solves this challenge by providing three regulated outputs—5V, 12V, and -12V—in a 45W open-frame design, ideal for powering mixed-voltage circuits in automation, instrumentation, and control equipment.

Who is it for

This power supply is intended for engineers, system integrators, and OEMs who need a dependable triple-output AC/DC converter for embedded applications, test fixtures, or industrial control panels. It suits projects where space is limited and multiple voltage rails are required, such as powering logic circuits, sensors, and analog stages simultaneously.

Main features

• Triple output: +5V (up to 5A), +12V (up to 2A), and -12V (up to 0.5A) for versatile power distribution.
• Wide input range: accepts 85–264VAC or 120–370VDC, making it compatible with global mains voltages.
• High efficiency: typical 78% efficiency reduces heat generation and energy waste.
• Comprehensive protection: built-in overload protection (hiccup mode, auto-recovery) and over-voltage protection on the 5V rail ensure safe operation.
• Open-frame PCB construction: easy to integrate into enclosures or systems with custom mounting.
• Safety and EMC compliance: meets UL60950-1, TUV EN60950-1, and EN55022 Class B for reliable, low-noise performance.

Specifications

• Rated power: 45W
• Output 1: +5V DC, 0.5–5A
• Output 2: +12V DC, 0.1–2A
• Output 3: -12V DC, 0.1–0.5A
• Input voltage: 85–264VAC / 120–370VDC
• Ripple & noise: 80mVp-p (5V), 120mVp-p (±12V)
• Voltage adjustment range (CH1): +4.75 to +5.5V
• Operating temperature: -10 to +60°C
• Mounting: open frame / PCB type
• Safety standards: UL60950-1, TUV EN60950-1
• EMC: EN55022 Class B, EN61000-3-2,3, EN61000-4-2,3,4,5,6,8,11

Tips

When integrating the PT-45B, ensure adequate airflow around the unit to maintain operation within the specified temperature range. For applications requiring a specific 5V output, use the built-in adjustment potentiometer to fine-tune the voltage. Always verify that the total load across all three outputs does not exceed 45W to avoid triggering overload protection.