ABB NVAR-55 Varistor Board

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 1. Product Overview

The ABB NVAR-55 Varistor Board is a protective component used in low and medium voltage industrial electrical systems. It absorbs voltage spikes and surges to protect electrical equipment from overvoltage damage. The board uses high-quality metal oxide varistors (MOVs), providing fast response and high surge tolerance, making it suitable for industrial automation, power distribution equipment, and drive systems to enhance operational reliability.

2. Main Technical Parameters

Electrical Data

• Model: NVAR-55

• Rated Voltage: 55 V AC/DC (typical)

• Maximum Surge Current: Designed to withstand transient surges

• Response Time: Nanosecond-level fast response

• Power Rating: Depends on circuit design

• Insulation Resistance: ≥ 100 MΩ

• Protection Function: Overvoltage and surge voltage suppression

Mechanical & Installation

• Board Dimensions: Standard modular PCB design

• Mounting: Control cabinet or drive internal slot

• Weight: approx. 0.2–0.5 kg

• Cooling: Natural convection

Environmental & Operating Conditions

• Operating Temperature: -10°C to +70°C

• Storage Temperature: -20°C to +85°C

• Relative Humidity: 5%–95% (non-condensing)

• Protection Level: Suitable for internal installation in cabinets or devices

Standards & Certifications

• IEC/EN 61643 series

• CE, RoHS certified

3. Advantages and Features

• Overvoltage Protection: Effectively absorbs transient surges to protect equipment

• Fast Response: Nanosecond-level response to suppress voltage spikes promptly

• High Reliability: Durable metal oxide varistor material

• Modular Design: Easy to install, maintain, and replace

• Industrial Compatibility: Suitable for low/medium voltage cabinets and drive systems

• Space-Saving: Compact PCB design for internal integration

4. Typical Applications

• Industrial automation systems

• Motor drive protection

• Power distribution and control cabinets

• UPS and voltage stabilizer protection

• Industrial robot control systems

• Industrial electronic devices and measurement/control systems

5. Application Notes

• Ensure rated voltage matches system voltage

• Install in a ventilated location, avoiding high-temperature environments

• Avoid continuous operation above rated surge current

• Regularly inspect the board and connection terminals

• Disconnect power before installation or maintenance for safety

• Avoid direct exposure to corrosive gases or liquids

The structure and details of the product：

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