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MOREDAY MDIS-40MD IP66/IP66NW DC isolator 1200V DC 32A 2 pole 4 pole solar isolator switch TUV/ CE /CB certified.Its IP66 rating provides robust protection against environmental elements, complemented by UV-resistant and flame-retardant materials for durability and safety compliance.

  • 1200VDC 32A for solar DC system
  • IP66/IP66NW suitable for outdoor installation
  • Flame retardant material UV resistant
  • Vent valve optional
  • Lockable at off position
  • Typically 3ms disconnect time
  • MC4 connector optional

Stable Delvery Time

Technical Support

2 Years

MDIS-40MD DC Isolator IP66NW

MDIS-40MD DC Isolator IP66NW: A Vital Component for Your Photovoltaic System

The MDIS-40MD DC Isolator is a cutting-edge safety device, essential for maintaining the operational integrity and safety of photovoltaic (PV) systems. With a robust design certified for outdoor use, this isolator ensures continuous performance even in harsh environmental conditions. The isolator is specifically crafted to meet the rigorous demands of the solar power industry, providing reliable disconnection under load conditions.

Key Features and Advantages

MDIS-40MD DC Isolator IP66NW High Durability

High Durability

Encased in a PC+ABS housing with a V1 flame rating and an IP66NW certification, the MDIS-40MD guarantees superior durability and resistance to environmental factors, including UV exposure and water ingress.

Flexibility in Application

Available in various ratings (16A, 25A, 32A), it accommodates a wide range of operational voltages up to 1200V, making it suitable for diverse installation requirements.

MDIS-40MD DC Isolator IP66NW Flexibility in Application
MDIS-40MD DC Isolator IP66NW Ease of Use

Ease of Use

Features a user-friendly 90º rotary handle, allowing effortless operation. Its compact design (83mm61mm46mm) enables easy integration into PV systems without requiring extensive space.

Safety and Compliance

Complies with global safety standards, including CE and TUV certifications, ensuring its suitability for both domestic and international markets.

Applicable Scenarios

Large-scale solar farms

Rooftop solar panels on industrial buildings

Residential solar systems in areas prone to extreme weather conditions

Why Choose Moreday?

Innovative Solutions

Continuously advancing in high-tech solar technology with over 30 patents.

Customer-Centric Services

 Tailored services meeting the specific needs of diverse clients.

Global Reach

Trusted by over 1000 customers across more than 100 countries.




Maximum Continuous Operating DC Voltage


Nominal Discharge Current (8/20 µs)

20 kA

Impulse Discharge Current (10/350 µs)

6.25 kA

Total Discharge Current (10/350 µs)

12.5 kA

Total Discharge Current (8/20 µs)

40 kA

Maximum Discharge Current (8/20 µs)

40 kA

Voltage Protection Level


Residual Current at Uc

< 0, 5 mA

Response Time

< 25 ns

Short-Circuit Current Rating

2000 A

Operating Temperature Range

-40 ºF to +158 ºF [-40 ºC to +70 ºC]

Permissible Operating Humidity


Atmospheric pressure and altitude

80k Pa-106k Pa / -500 m-2000 m


35 mm DIN Rail, EN 60715

Degree Of Protection

IP 20 (built-in)

Housing Material

Thermoplastic: Extinguishing Degree UL 94 V-0

Thermal Protection


Operating State / Fault Indication

Green ok / Red defect

Remote Contacts (RC)


RC Switching Capacity

AC: 250V / 0.5 A; DC: 250V / 0.1 A; 125 V / 0.2 A; 75 V / 0.5 A

RC Conductor Cross Section (max)

16 AWG (Solid) / 1.5 mm2 (Solid)

popular questions


1. What is the purpose of the MDIS-40MD DC Isolator?

The MDIS-40MD DC Isolator is used to safely disconnect the DC power in photovoltaic systems. This is crucial during maintenance or emergency situations to ensure the safety of personnel and protect the equipment from potential electrical hazards.

2. What makes the MDIS-40MD suitable for outdoor installations?

The MDIS-40MD is designed with a high-grade PC+ABS housing rated at IP66NW, making it dustproof, waterproof, and UV-resistant. This ensures that it can withstand harsh weather conditions, including heavy rain and strong sunlight, making it ideal for outdoor installations.

3. Can the MDIS-40MD handle different voltage levels?

Yes, the MDIS-40MD can handle various voltage levels up to 1200V DC. It is available in different models to support 16A, 25A, and 32A configurations, accommodating a broad range of operational requirements in solar energy systems.

4. How do I install the MDIS-40MD DC Isolator?

The MDIS-40MD is designed for easy installation via rail mounting inside a distribution box. The compact design allows for efficient use of space and straightforward setup. Detailed installation instructions are included with the product and can also be found on our website.

5. Are there any specific maintenance routines recommended for the MDIS-40MD?

The MDIS-40MD requires minimal maintenance due to its durable construction. However, regular visual inspections to check for any signs of wear or damage and ensuring that the isolator is free from dust and debris are recommended. Always ensure the system is powered down before performing any maintenance checks.

6. What certifications does the MDIS-40MD hold?

The MDIS-40MD is certified under multiple international standards, including CQC, CE, CB, TUV, and ROHS. These certifications attest to its safety, quality, and environmental compliance, making it a reliable choice for global applications.

7. How does the MDIS-40MD improve safety in solar installations?

By providing a reliable means to completely disconnect DC power, the MDIS-40MD prevents accidental electrical shocks and reduces the risk of fire by isolating electrical components during faults or when maintenance is being performed.

8. What should I do if the MDIS-40MD is not functioning properly?

If the MDIS-40MD shows signs of malfunctioning, immediately disconnect it from the system and contact Moreday technical support. Do not attempt to repair the unit yourself as this may void the warranty. Our support team is available to provide assistance and facilitate repairs or replacements as needed.

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