Mining Encapsulated and Intrinsically Safe DC Regulated Power Supply

1. Introduction

KDW127/12(A) Mining Encapsulated and Intrinsically Safe DC Regulated Power Supply (hereinafter referred to as the Power Supply Box) is designed for application in environments containing explosive gases in underground coal mines. It is suitable for providing power to various types of mining intrinsically safe equipment.

Weight：≤3 kg

Size：262x90x 65 （mm）

2. Principle and Functions  
It accepts an AC input of 127V and outputs DC 12V. The device is equipped with current‑limiting and short‑circuit protection functions, and can automatically recover after fault removal.

3. Main Technical Specifications  
3.1 AC Power Supply Parameters  
AC Supply: 127 VAC  

3.2 Intrinsically Safe Output Parameters  
Uo: DC 12.5 V  Io: 1.8 A  Co: 22 µF  Lo: 50 µH  

3.3 Power Supply Characteristics  
Rated Operating Voltage: AC 127 V (range 75% – 110%)  
Rated Input Apparent Power: ≤ 100 VA  

• Rated Output Voltage: DC 12 V  
• Rated Output Current: 1.7 A  
• Maximum Output Voltage: ≤ 12.5 V  
• Over‑current Protection Trip Value: ≤ 1.8 A  
• Short‑circuit Current: < 100 mA  
• Output Voltage Deviation: < 5%  
• Load Regulation: < 5%  
• Line Regulation: < 5%  
• Peak‑to‑peak Ripple & Noise: ≤ 250 mV