Industrial Thyristor / SCR Products Purchasing Guide

Before You Buy: Define Your Requirements

Providing clear information at the inquiry stage helps us recommend the right product faster and avoid mismatches.

Basic product information

Please specify:

• Product model

• Mechanical structure

• Bolt type / Recessed type / Protruding type (or other required structure)

• Heatsink model (if already selected)

Why this matters:

• The model determines core performance and application range.

• The structure affects mounting method, installation space and mechanical compatibility.

• The heatsink is critical for SCR/thyristor devices. Proper thermal design directly affects temperature rise, stability and service life.

Electrical and performance parameters

Please indicate the key parameters for your application, such as:

• Operating current and voltage

• Control / response speed requirements

• Operating mode or control signal type (if any)

• Any special conditions (frequent start/stop, high inrush current, etc.)

Clear parameter requirements help to:

• Ensure the product can meet the real load and process conditions

• Avoid under‑ or over‑specification

• Reduce trial‑and‑error and hidden costs in procurement and commissioning

 Customization and technical support

If standard models cannot fully meet your needs, PowerPassion can:

• Quickly develop similar or derivative products based on existing platforms

• Provide detailed datasheets, drawings and application notes

• Arrange technical discussions with your engineering team (online or on‑site, where feasible)

This is particularly useful for:

• New equipment design

• System upgrades and energy‑saving retrofits

• Special environments or non‑standard installation conditions

Operating Conditions: Environment and Cooling

To ensure long‑term stable operation, please confirm that your site conditions meet the following guidelines.

Environmental conditions

• Ambient temperature

• Natural cooling / forced air cooling: approx. -40 ℃ to +40 ℃

• Water cooling: typically +5 ℃ to +40 ℃

• Humidity and air quality

• Relative humidity ≤ 85% (non‑condensing)

• No corrosive gases; avoid conductive or insulation‑damaging dust

• Atmospheric pressure & vibration

• Atmospheric pressure roughly 86–106 kPa (close to standard air pressure)

• No severe vibration or mechanical shock around the device

For special environments (high altitude, heavy dust, strong corrosion, etc.), reliability tests or additional protective measures are strongly recommended before large‑scale deployment.

Cooling requirements

SCR / thyristor devices generate heat during operation; proper cooling is essential.

• Forced air cooling

• Air speed: ≥ 6 m/s

• Air temperature: ≤ 40 ℃

• Water cooling (if applicable)

• Flow rate: typically ≥ 4 L/min (check actual product datasheet)

• Water pressure: around 0.2 ± 0.03 MPa

• Water temperature: ≤ 35 ℃

• Water quality: resistivity ≥ 20 kΩ·cm, pH between 6 and 8

• Other cooling methods (oil cooling, cold plate, etc.)

• Should be validated by temperature‑rise and reliability tests to confirm safe operation under real conditions.

Key Usage Notes: Selection Margin, Protection, Self‑Check

Leave appropriate selection margin

When choosing current and voltage ratings:

• Do not select only at the exact theoretical value

• Reserve proper safety margin for:

• Short‑term overload

• Grid fluctuations

• Start‑up inrush current

Reasonable derating helps extend device life and improve system reliability.

Circuit protection and current sharing

• Protection circuits

• Over‑voltage protection to handle surges and spikes from the mains

• Over‑current protection to react quickly under faults such as short circuits or locked loads

• Series / parallel operation

• For multiple devices in series: provide voltage‑sharing (equalizing) networks

• For parallel devices: provide current‑sharing measures and proper wiring layout

These measures help avoid unbalanced stress, where one device is overloaded while others are lightly loaded.

Simple on‑site self‑check

Using a multimeter, maintenance personnel can perform a basic check:

• Gate to cathode: resistance typically in the range of tens of ohms (exact values refer to datasheet)

• Anode to cathode: reverse resistance usually > 1 MΩ (except in intended forward‑conducting directions, such as diodes)

Common abnormal findings:

• Resistance close to 0 Ω: possible short‑circuit or breakdown

• Resistance significantly below normal high‑resistance level: possible insulation deterioration or leakage

This quick check helps narrow down suspected faulty devices and shortens troubleshooting time. For safety, all tests must be carried out by qualified personnel after confirming the system is powered off and properly isolated.