WGI10-48S12L Isolated 48V (36-75V) In To 12V 10A 120W DC-DC Waterproof Buck Step Down Converter Module

📋 Overview

The WGI10-48S12L is an industrial-grade isolated DC-DC step-down converter engineered for demanding commercial and industrial environments where reliable 12V power must be derived from a 48V nominal (36–75V) source. Galvanic isolation between input and output provides a critical safety barrier that protects sensitive downstream electronics from high-voltage transients, ground loops, and electrical noise — making it an ideal fit for telecommunications, solar energy systems, electric vehicles, and marine applications.

Built with synchronous rectification technology, this converter achieves 92% efficiency at full load, minimizing heat generation and maximizing power delivery. The rugged, sealed aluminum enclosure carries an IP65 waterproof rating for reliable operation in wet, dusty, and harsh outdoor environments. A comprehensive built-in protection suite — covering short circuit, overcurrent, overvoltage, over-temperature, undervoltage lockout, and reverse polarity — ensures worry-free performance in mission-critical installations.

⭐ Key Features

• Wide Input Voltage Range: 36V–75V DC — compatible with 48V battery banks, telecom power plants, and solar arrays
• Galvanic Isolation: ≥1500V input-to-output isolation for critical safety separation and ground loop elimination
• High Efficiency: 92% typical at 48V input, full load — reduces heat and extends component lifespan
• High Power Density: 120W (12V @ 10A) output in a compact sealed enclosure
• IP65 Waterproof Rating: Sealed aluminum housing protects against dust ingress and direct water jets
• Comprehensive Protection Suite: Short circuit, overcurrent, overvoltage, over-temperature, undervoltage lockout, and reverse polarity protection — all with automatic recovery
• Wide Operating Temperature: −40°C to +50°C ambient — rated for extreme environments
• Synchronous Rectification: Advanced topology for superior efficiency and reduced thermal dissipation
• Premium Internal Capacitors: NCC & NICHICON for high reliability and long service life
• 100% Factory Burn-In Tested: Every unit tested at full load before shipment
• RoHS & CE Compliant

📊 Specifications

Input

Output

Isolation & Safety

Protection

Environmental & General

💡 Why Choose an Isolated DC-DC Converter?

Unlike standard (non-isolated) buck converters, the WGI10-48S12L provides galvanic isolation — a complete electrical barrier — between the input and output circuits. This matters in real-world installations for several reasons:

• Safety: The ≥1500V isolation barrier protects users and sensitive equipment from dangerous high-voltage faults on the input side
• Ground loop elimination: Isolation breaks the ground loop paths that cause noise, hum, and measurement errors in sensitive instrumentation and communications equipment
• Multi-domain interfacing: Safely connect a 48V battery system to 12V electronics without shared ground concerns or potential damage from ground differentials
• Standards compliance: Many industrial, telecom, and medical applications require galvanic isolation between power domains — this module meets that requirement

🔌 Wiring & Connections

The WGI10-48S12L uses clearly labeled screw terminal blocks for both input and output. An optional CNT pin provides remote on/off control for system-level power management.

Terminal Reference

⚠️ Important: The output ground V_OUT(−) is galvanically isolated from the input ground V_IN(−). Do not assume they share a common reference. In most installations, leave the output ground floating. In rack-mounted or earth-bonded installations, V_OUT(−) may be intentionally tied to chassis ground — this is acceptable where required, but is not automatic.

Basic Wiring Steps

1. Disconnect your DC power source before making any connections.
2. Connect the input positive lead (16 AWG or heavier) to V_IN(+). Install a 7.5A fuse in this lead, close to the power source.
3. Connect the input negative lead to V_IN(−).
4. Connect your load's positive wire to V_OUT(+) and the load's negative wire to V_OUT(−).
5. Verify all connections are tight and correctly polarized before applying power.
6. Apply power and confirm the output reads approximately 12V DC.

📡 Using the WGI10-48S12L in a −48V Telecom System

The WGI10-48S12L is well suited for use in telecom central office and carrier-grade installations powered by a standard −48V DC power plant. Telecom power systems use a negative ground convention: the positive terminal (Battery Return, or RTN) sits at 0V and is bonded to earth ground, while the negative terminal (BATT) is the −48V supply rail. Because the module accepts 36–75V input, it covers the full operating voltage window of a −48V telecom plant — from approximately −42V (battery discharge) to −56V (float charge).

Input Connections for a −48V System

• V_IN(+) → RTN Bus (0V / Battery Return)
• V_IN(−) → BATT Bus (−48V)

The voltage differential across the input terminals is 0V − (−48V) = 48V — exactly within the module's rated input range.

For a full explanation of the −48V negative ground convention, step-by-step wiring instructions, safety requirements, and output grounding guidance, see the WGI10-48S12L User Guide.

⚠️ Protection Features Explained

All protection modes use automatic recovery — the converter restarts on its own once the fault condition is cleared, with no manual reset required.

• Short Circuit Protection (SCP): Enters hiccup mode and sustains a continuous output short for up to 4 hours without damage. Restarts automatically when the short is removed.
• Overcurrent Protection (OCP): Activates at 10.5A–14A output. Hiccup mode with automatic recovery when the overload is removed.
• Output Overvoltage Protection (OVP): Triggers at 13.8V–15V. Protects downstream equipment from voltage spikes. Hiccup mode with auto-recovery.
• Over-Temperature Protection (OTP): Shuts down at 85°C shell temperature. Restarts automatically when the shell cools to 80°C.
• Input Undervoltage Lockout (UVLO): Prevents operation when input drops below approximately 31.5V (typical). Automatically restarts when input voltage recovers.
• Reverse Polarity Protection: Prevents damage from accidental reversal of input connections.

💡 Tip: If the converter is cycling on and off rapidly, it is in hiccup mode. Check for an output short circuit, an overloaded output (load drawing more than 10A), or an input voltage that is too low before assuming the unit is faulty.

🎯 Applications

• Telecommunications: Powering 12V equipment from standard −48V central office and telecom DC power plants
• Solar & Alternative Energy: Off-grid and grid-tied solar installations with 48V battery banks
• Electric Vehicles & Golf Carts: Auxiliary 12V accessory power from a 48V drive bus
• Marine & Boating: IP65 waterproof design is ideal for boats, yachts, and marine electronics enclosures
• Industrial Automation: PLCs, sensors, and control systems powered from a 48V plant bus
• Military & Defense: Ruggedized isolated power conversion for field-deployed electronics
• Medical Equipment: Isolated power conversion where galvanic separation between power domains is required by design

🔧 Installation Notes

• Use 16 AWG or heavier wire for all input and output connections
• Install a 7.5A fuse in the positive input lead (or the BATT lead in a −48V telecom system), close to the power source
• The module uses natural convection cooling — ensure adequate clearance above the finned heatsink for air circulation. No external fan is required under normal operating conditions.
• For near-full-load operation in warm environments, mount the module vertically to maximize chimney-effect airflow, or provide light forced-air cooling
• The IP65 waterproof rating protects against dust and water jets — the module is not rated for submersion
• Four corner mounting holes (Ø3.8mm) allow secure panel mounting; mounting to a metal surface also aids thermal dissipation
• Do not exceed 2000µF of external capacitance on the output — excess capacitance can cause slow startup or trigger overvoltage protection on power-up
• The optional CNT (Remote On/Off) pin can be driven by a switch, transistor, or logic signal. Leave it open for standard always-on operation.

📦 What's in the Box

• 1 × WGI10-48S12L Isolated DC-DC Converter Module

📄 Documentation & Resources

• WGI10-48S12L User Guide
• Manufacturer's Datasheet (PDF)

Sold and supported by Envistia Mall. Ships from the USA. For wiring diagrams and detailed setup instructions, see the WGI10-48S12L User Guide linked above. The manufacturer and Envistia LLC (dba Envistia Mall) are not responsible for any damages or losses resulting from the use of this product. Always follow proper electrical safety practices when working with electronic components. Specifications are based on manufacturer data and are subject to change without notice.