Protective Device Product List and Ranking from 11 Manufacturers, Suppliers and Companies

Last Updated： Aggregation Period:Sep 17, 2025～Oct 14, 2025
This ranking is based on the number of page views on our site.

Protective Device Manufacturer, Suppliers and Company Rankings

Last Updated： Aggregation Period:Sep 17, 2025～Oct 14, 2025
This ranking is based on the number of page views on our site.

  1. 昭電 Tokyo//others
  2. サンコーシヤ Tokyo//others
  3. 音羽電機工業 Hyogo//Building materials, supplies and fixtures manufacturers
  4. 4 富士電機 電源ソリューション Tokyo//Electrical equipment construction business
  5. 5 永楽電気 Tokyo//Electrical equipment construction business
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Protective Device Product ranking

Last Updated： Aggregation Period:Sep 17, 2025～Oct 14, 2025
This ranking is based on the number of page views on our site.

  1. Power Supply SPD "GN Series" 昭電
  2. Built-in SPD for equipment MT-ZGB254C 音羽電機工業
  3. Solar power generation model 'MZSR-600PV/MZSR-1000PV' サンコーシヤ
  4. Class I and Class II compatible power supply SPD 'MZS/MZCR' サンコーシヤ
  5. 4 Product Catalog - Power 永楽電気

Protective Device Product List

1～15 item / All 19 items

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D-UFB Series

D-UFB Series

Protect computers and control systems from surges up to 5kA of large surge current!

The "D-UFB Series" can protect computers and control systems from surges of up to 5kA simply by connecting to the data line with a D-SUB connector. Input/output is connected via a D-SUB connector, and grounding is achieved by connecting to the grounding screw on the housing. The housing is made of metal and has excellent shielding properties. 【Specifications】 ■ Model: D-UFB-V24 (RS232), D-UFB-V11 (RS422), D-UFB-485 (RS485) ■ Rated Voltage: DC15V / DC12V ■ Surge Current Capacity: 5kA (8/20us) ■ Dimensions: Width 85 × Depth 54.5 × Height 23mm *For more details, please feel free to contact us.

  • others

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Solar power generation model 'MZSR-600PV/MZSR-1000PV'

Solar power generation model 'MZSR-600PV/MZSR-1000PV'

Power supply SPD compatible with solar power generation systems up to DC1000V.

The "MZSR-600PV type / MZSR-1000PV type" is a surge protective device (SPD) for solar power generation systems that can handle a maximum discharge current of 40kA (for lightning surge 8/20μs). It is designed to protect PV systems with DC600V/DC1000V, and is available in two models, PVI type and PVY type, depending on the presence of a grounding phase. With the built-in deterioration indicator type DC fuse, it safely disconnects even in the event of a PV system accident. 【Features】 ■ Supports a maximum discharge current of 40kA (for lightning surge 8/20μs) ■ Compatible with DC600V/DC1000V PV system protection ■ Plug-in type ■ Deterioration failure indication function *For more details, please refer to the catalog. Feel free to contact us with any inquiries.

  • Disaster prevention supplies
  • others

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Class I and Class II compatible power supply SPD 'MZS/MZCR'

Class I and Class II compatible power supply SPD 'MZS/MZCR'

Class I and II compatible! SPD that protects electrical equipment power supplies from direct lightning and induced lightning surges.

The "MZS/MZCR" is an SPD (surge protective device) that protects the power supply section of electrical equipment from direct lightning strikes and induced lightning surges. It is compatible with Class I (10/350μs) and can handle direct lightning strikes up to 75kA, as well as overvoltage occurring between N-PE due to ground fault accidents (MZS-NPE400). It is ideal for protecting low-voltage power circuits such as distribution boards and sub-distribution boards, as well as power circuits for communication, broadcasting, electricity, and railways, and various control equipment power circuits. 【Features】 ■ Equipped with a deterioration display function ■ Built-in disconnection mechanism during deterioration ■ Alarm contact output ■ Continuing current interruption rated current of 50kA ■ Excellent response characteristics (under 3ns) For more details, please refer to the catalog or feel free to contact us.

  • Lightning protection

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Clean Energy Equipment Lightning Protection Products

Clean Energy Equipment Lightning Protection Products

Ideal for solar and wind power generation equipment! Introduction of lightning protection products for clean energy facilities.

Clean energy sources such as solar power and wind power, which will continue to increase in the future, require a stable power supply system, including the introduction of smart grids. However, these systems, which are installed outdoors, are susceptible to lightning damage, and comprehensive lightning protection measures are essential for efficient operation. Sankosha offers comprehensive lightning protection solutions to safeguard systems from various lightning damage risks with industry-leading technology. [Examples of Lightning Protection] [For Solar Power Equipment] ■ SPD for solar power systems, SPD for AC power sources, SPD for communication, SPD for LAN ■ Ground resistance reduction material (Sun Earth) [For Wind Power Equipment] ■ SPD for AC power sources, SPD for communication, lightning-resistant transformers, ground resistance reduction material (Sun Earth) ■ Aviation obstruction lights, charge quantity calculation type lightning surge counters For more details, please refer to the catalog or feel free to contact us.

  • Lightning protection
  • Solar power generation equipment
  • Photovoltaic power generation system (solar system, energy-saving housing, electricity sales business)

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Built-in SPD for equipment MT-ZGB254C

Built-in SPD for equipment MT-ZGB254C

European Integration Standards (EN) UL Standard Certification Class 2 (JIS C 5381-11) Compliance

Compact and space-saving design. Compatible with induced lightning. Protects equipment from lightning surges that enter through power supply and grounding. JIS compliant. A standard SPD that can be installed in distribution boards and sub-distribution boards. Manufactured by Otowa Electric Industry, a specialist in lightning protection products, including SPDs, lightning arresters (such as arresters and surge protectors), and measures against lightning surges.

  • Lightning protection
  • Power distribution and control panels

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[Production Ended] Instant Voltage Drop Protection Device PS Series (3, 5 kVA)

[Production Ended] Instant Voltage Drop Protection Device PS Series (3, 5 kVA)

We protect computers, systems, equipment, and devices from momentary voltage drops and interruptions caused by lightning strikes and other issues!

"Instantaneous voltage drop" is often caused by lightning, and the majority of occurrences happen within 0.3 seconds. Even a slight drop in voltage can lead to malfunctions or shutdowns of computers and control devices on the line, power equipment like motors ceasing operation, losses in startup time for vacuum devices, and the production of defective products due to production line stoppages, all of which can significantly damage delicate FA systems and ultimately result in enormous economic losses. The "instantaneous voltage drop protection device" responds to instantaneous voltage drops and interruptions with power supply lasting more than 0.35 seconds. It is fanless and battery-less, eliminating the need for maintenance or replacement parts, and is maintenance-free with a long lifespan (capacitor life) of 15 years.

  • Power generation equipment
  • Other security systems

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Protection device for detecting abnormalities in railway vehicle transformers.

Protection device for detecting abnormalities in railway vehicle transformers.

Abnormalities in the vehicle transformer detected! A wide range of protective devices to prevent accidents before they occur.

Our company offers a variety of protective devices that detect abnormalities in vehicle transformers and prevent accidents before they occur. These devices have vibration and shock resistance to withstand forced vibrations and impacts from vehicle operation, and they are built to endure flying debris such as stones during travel. 【Features】 ■ Temperature relay: Monitors the oil temperature inside the transformer tank ■ Oil flow relay: Detects oil flow and monitors the operating status of the oil pump ■ Oil level detector: Detects a drop in internal oil level ■ Pressure relief valve: Captures pressure increases inside the transformer and releases pressure instantly *For more details, please refer to the PDF document or feel free to contact us.

  • Other measuring instruments
  • others

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Overload protection device "TORQUE LIMITERS"

Overload protection device "TORQUE LIMITERS"

Outstanding performance and high reliability! Choose from a wide range of products across all 8 series.

"TORQUE LIMITERS" are overload protection devices that can accurately transmit torque. They have no backlash and high rigidity, with precise return positions after overload disconnection, and can detect overloads. They employ a unique mechanical torque disconnect mechanism using ball & ball pockets and roller & roller pockets. 【Features of the TF Series】 ■ Can be directly mounted on tables, sprockets, pulleys, arms, etc. ■ Standardized small series ■ Minimum disconnect torque of 0.3 N·m ■ Have a long history, abundant track record, and high reliability ■ Suitable for Sundex D, DU, DR, and P series *For more details, please refer to the PDF document or feel free to contact us.

  • others

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[Disaster Prevention] Easily prevent leakage risks from old pipes left unattended for over 20 years!

[Disaster Prevention] Easily prevent leakage risks from old pipes left unattended for over 20 years!

Old pipes are likely to suddenly cause multiple leaks even with a small earthquake. Large-scale replacement work for the pipes can result in significant damage... What measures can be taken now?

Are you aware? The lifespan of piping is said to be about 20 years. At first glance, piping is often overlooked because it is not visible from the outside, but like buildings, it continues to deteriorate over time. Furthermore, in recent years, the majority of equipment damage caused by earthquakes has been due to "piping within buildings," such as air conditioning systems. Sudden leaks caused by earthquakes can occur in multiple locations and result in significant damage... Once a leak happens, it requires a large-scale construction cost for "replacing the piping (piping renewal)." To prevent accidents before they happen, we recommend the NMR Pipe Protector! ★ By simply installing it on the outside of the piping, it extends the lifespan of the piping and strengthens the interior! ★ = Maximum Benefits = - The introduction cost is less than one-tenth of piping renewal. - Running costs and maintenance are "zero." - High safety that is also implemented in food factories and hospitals. Please feel free to contact us first.

  • Water Treatment

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[NMR Pipe Protector Verification Results] Fukuoka Prefecture Condominium

[NMR Pipe Protector Verification Results] Fukuoka Prefecture Condominium

After 16 years of installation, the effectiveness verification shows a reduction in red rust blockage rate from 50.7% to 41.2%, an improvement of 18.7%! Demonstrating the effectiveness of red rust prevention and extending the lifespan of piping.

A follow-up survey was conducted in a condominium in Fukuoka Prefecture, 16 years after the installation of the NMR pipe protector. Before installation, the joints of the water supply pipes in Rooms A and B were inspected with a fiberscope, revealing red rust blockage rates of 50.7% and 78.2%, respectively, indicating significant progression of red rust blockage and the need for early intervention. Consequently, the NMR pipe protector was installed in the water supply piping. One year after installation, a follow-up survey was conducted under the same conditions as before installation, and the red rust blockage rates for Rooms A and B were as follows: [One Year After Installation] Room A: 50.7% → 48% [5.3%] reduction improvement Room B: 78.2% → 74.1% [5.2%] reduction improvement [Sixteen Years After Installation] Room A: 50.7% → 41.2% [18.7%] reduction improvement Room B: 78.2% → 68.4% [12.5%] reduction improvement From the above reduction improvement rates of red rust blockage, it was demonstrated that the NMR pipe protector completely prevented the occurrence of new red rust and that the red rust blockage transformed into black rust with a volume reduction of 1/10. Furthermore, it was proven that as long as this condominium remains standing for another 20 or 30 years, pipe replacement will not be necessary.

  • Rust Inhibitor

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Power Supply SPD "GN Series"

Power Supply SPD "GN Series"

Protects important equipment from lightning damage! High cost-performance Class II SPD model.

The "GN Series" is an SPD for power supplies that complies with JIS C 5381-11. It balances cost performance with the necessary surge capacity, making it suitable for systems that require reliability. There are two models in the lineup: the mid-range model "GN-2 Series" with Imax 20kA and the standard model "GN-1 Series" with Imax 10kA. 【Features】 ■ Electric fault indication and electric alarm contacts (GN-2 Series) ■ Complies with Class II SPD for low voltage in the Standard Specifications for Public Building Construction (2016 edition) ■ Can be connected to the primary side of a leakage breaker ■ Additional model names that include specified SPD separators *For more details, please refer to the catalog or feel free to contact us.

  • Power distribution and control panels

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JIS Class II compliant power supply SPD 'Smart SPD System'

JIS Class II compliant power supply SPD 'Smart SPD System'

JIS Class II compliant! SPD that can be remotely monitored for recommended replacement timing via LAN communication.

The "Smart SPD System" is a power SPD (surge protective device) that allows remote monitoring of recommended replacement timing based on lightning surge measurement values via LAN communication. In combination with a monitoring unit, it is possible to check lightning surge information and the status of the SPD. This enables replacement of the SPD before it completely loses functionality, eliminating unprotected time due to failure and allowing for efficient maintenance. 【Features】 ■ Visualization of degradation status with replacement recommendation display ■ Equipped with a color LCD screen for easy management on-site ■ Compliant with JIS C 5381-1 Class II ■ Conforms to the Ministry of Land, Infrastructure, Transport and Tourism's Building Equipment Design Standards and the Ministry's Standard Specifications for Public Building Construction ■ Compliant with RoHS Directive For more details, please refer to the catalog or feel free to contact us.

  • Lightning protection

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