300VDC Din Rail Mount Breaker, Single Pole, Polarized - 50

300VDC Din Rail Mount Breaker, Single Pole, Polarized – High-Performance Circuit Protection for Solar Systems

As the demand for solar and renewable energy systems grows across the United States, so does the need for reliable, safe, and long-lasting components that ensure the performance and protection of these systems.

One such critical component is the 300VDC Din Rail Mount Breaker, Single Pole, Polarized —a robust, ETL-listed DC breaker that delivers consistent protection for modern solar applications.

Designed for solar professionals and homeowners alike, this breaker is engineered for high voltage DC circuits, offering reliable circuit protection, quick installation, and seamless compatibility with MidNite Solar enclosures.

It is a must-have for anyone building or upgrading a solar energy system.

Why the 300VDC Din Rail Mount Breaker, Single Pole, Polarized Is Essential

In solar and energy storage systems, maintaining safety and system integrity is paramount. The 300VDC Din Rail Mount Breaker, Single Pole, Polarized is built specifically for DC voltage applications.

It prevents overcurrent and short circuit damage while supporting high fault current interruption ratings—perfect for systems operating up to 300 volts DC.

With new part numbers like MNEPV15-300-1PP and MNEPV30-300-1PP replacing older 150VDC and 300VDC models, this updated breaker line offers advanced features, consistent availability, and trusted performance.

Key Features

Rated for 300VDC Applications

Engineered to handle direct current voltages up to 300 volts, ideal for solar panel strings and battery banks.

High Fault Current Protection

Offers a 10,000 AIC (Ampere Interrupting Capacity), ensuring protection from high-energy fault conditions.

ETL Listed

Certified for safety and reliability in the U. S. and Canada when used in appropriate enclosures.

Single Pole Design

Compact yet powerful, suitable for various branch circuit configurations in solar applications.

Polarized

Ensures correct directional installation, maintaining safe and efficient power flow.

Indoor Rated (Type 1 Enclosure)

Suitable for indoor installations within compliant solar breaker boxes.

100% Current Rating at Ambient Temperature

Designed to hold its full current rating regardless of temperature fluctuations.

Wide Wire Range Compatibility

Supports wire sizes from 14 AWG to 6 AWG, giving flexibility for a variety of solar setups.

Technical Specifications

• Product Name: 300VDC Din Rail Mount Breaker, Single Pole, Polarized

Voltage Rating: 300V DC

• Current Ratings Available: 15A, 20A, 30A, 40A, 50A
• Amp Interrupting Capacity (AIC): 10,000 A

Number of Poles: 1 (Single Pole)

• Environmental Rating: Type 1 (Indoor use only)
• Wire Size Range: 14 AWG to 6 AWG

Mounting Type: DIN Rail Mount

Torque Value: 20 In-Lbs (2.3 Nm)

• Certifications: ETL Listed for US & Canada

Breaker Width: 1 inch (26mm)

• Warranty: 5-Year Manufacturer Warranty

Updated Model Replacement Chart

For those replacing older breakers, here's how the new part numbers correspond to discontinued models:

MNEPV15-300 → MNEPV15-300-1PP

MNEPV20-300 → MNEPV20-300-1PP

MNEPV30-300 → MNEPV30-300-1PP

MNEPV40-300 → MNEPV40-300-1PP

MNEPV50-300 → MNEPV50-300-1PP

These newer models are standardized, polarized, and readily available through solampio.com, ensuring continuous support for legacy systems and new builds alike.

Use Cases for the 300VDC Din Rail Mount Breaker, Single Pole, Polarized

This breaker is designed to serve a wide range of applications in both residential and light commercial solar systems:

Photovoltaic (PV) Panel Protection

Breakers provide branch circuit protection for solar PV arrays, preventing overcurrent events from damaging panels or wiring.

Battery Bank Circuit Protection

Ensure safe charging and discharging in 48V or higher battery systems commonly used in off-grid homes.

Charge Controller Protection

Placed between the PV input and charge controller to prevent surge or overcurrent damage.

Inverter DC Input Protection

Secure your inverter against reverse currents or potential short circuits with a reliable DC breaker.

Combiner Boxes and Load Centres

Perfect for use in MidNite Solar MNPV or other compatible enclosures, offering modular, organized power distribution.

Benefits of Using the 300VDC Din Rail Mount Breaker, Single Pole, Polarized

Reliable Safety Performance

Provides overcurrent protection with a high AIC rating to prevent equipment damage or fire risk.

Compact & Space-Saving

The single-pole design minimizes space consumption in breaker panels and combiner boxes.

Easy Installation

DIN rail mounting allows for quick installation and future maintenance or replacement.

ETL Certification Assurance

Listed for compliance in both the U. S. and Canada, ensuring quality and safety standards are met.

Long-Term Value

With a 5-year warranty and robust construction, this breaker ensures long-lasting protection.

Designed for Solar Use

Unlike generic breakers, this unit is purpose-built for DC solar applications and meets the unique demands of renewable energy systems.

Who Should Use This Breaker?

The 300VDC Din Rail Mount Breaker, Single Pole, Polarized is ideal for:

Solar Installers

Professionals seeking a reliable, code-compliant breaker for new solar installations.

DIY Solar Enthusiasts

Homeowners building off-grid cabins or RV solar setups with a focus on safe circuit design.

System Upgraders

Users replacing discontinued breakers in older MidNite Solar installations.

Contractors

Electrical contractors needing high-voltage DC circuit protection in green building projects.

Why Buy from Solampio.com?

When you purchase the 300VDC Din Rail Mount Breaker, Single Pole, Polarized from solampio.com, you're investing in quality, support, and long-term reliability. Here's what we offer:

Authentic, ETL-Listed Components

All products are verified and certified for compliance.

Expert Support Team

Speak to solar energy specialists for system design or installation advice.

Fast U. S. Shipping

Timely delivery across the United States with secure packaging.

Affordable Pricing

Competitive rates for installers and bulk orders.

Protection You Can Trust for Your Solar System

The 300VDC Din Rail Mount Breaker, Single Pole, Polarized is a vital piece of any safe and reliable solar power system. Built to the highest industry standards, this breaker protects your investment and ensures efficient operation for years to come.

With new model numbers replacing discontinued variants and improved performance specs, it's never been easier to upgrade or build your solar system with confidence.

Visit solampio.com to order your 300VDC breaker today and take the next step toward safer, smarter solar energy management.