1. Product Overview: 40D Series Varistors

️· Type: High-Energy Varistors (also known as Metal Oxide Varistors, or MOVs)
️· Application: Designed for surge protection in electrical circuits.
️· Manufacturer: YINT (as indicated by the website URL at the bottom of each page).
️· Revision: Rev: 19.3 (indicates a version/update of the document).
️· Disclaimer: Specifications are subject to change. Performance can vary depending on application and over time. Users should verify suitability for their specific use.

2. Key Electrical Parameters & Specifications (Table Summary)

The core of the document is the table detailing specific electrical characteristics for various 40D series models. Here's a summary of the columns & what they mean:

️· Part No: Model identifier (e.g., 40D201K, 40D182K).
️· Varistor Voltage (V): Nominal voltage at which the varistor is designed to operate.
️· AC Voltage Range (V): The range of AC voltage the varistor is designed to handle. (e.g., 185-225 for 40D201K)
️· DC Voltage Range (V): The range of DC voltage the varistor is designed to handle. (e.g., 130-170 for 40D201K)
️· Max. Limited Voltage (V): The maximum voltage that the MOV can sustain before significant degradation.
️· Withstanding Surge Current (Ipp) – 200A: The maximum surge current the varistor can handle for a specified duration (8/20 µs). Indicates surge protection capability.
️· 1t: (Likely a typo. Most likely refers to the "Energy" column –see below)
️· 2t: (Likely a typo. Most likely refers to the "Energy" column –see below)
️· Rated Wattage (W): The continuous power dissipation the varistor can handle without overheating.
️· Energy (μS/J): Represents the energy handling capability of the varistor for a surge. (Likely refers to Energy (µs), and Energy (J)
️· 8/20 µs: This refers to the surge characteristic. 8µs is the duration of the surge, and 20µs is a reference voltage.

Table Highlights (few examples):

️· 40D201K: Varistor Voltage: 200V. Surge Current: 340A, Energy: 260μs
️· 40D182K: Varistor Voltage: 1800V. Surge Current: 2475A, Energy: 1080μs

3. Environmental Conditions & Temperature

️· Operating Temperature Range: -45°C to +85°C (standard).
️· High-Temperature Option: -45°C to +125°C (for enhanced thermal performance).
️· Voltage Temperature Coefficient: Varistor voltage changes with temperature (specified as <0.05%/°C).

4. Surge Characteristic (8/20 µs)

️· This refers to a specific waveform used to test the surge protection capability of the varistor. The 8/20 µs waveform is a common standard. It means that the current rises to a peak value in 8 microseconds, and the voltage drops to 20% of that peak value in 20 microseconds.

5. Other Notes:

️· The table is only applicable to varistors with a varistor voltage of 82V or higher.
️· The 15 times/40 times surge rating only applies to varistors with a varistor voltage of 430V or higher.
️· "1t" and "2t" columns in the table are likely typos that refer to the Energy columns.