Medium Voltage Thyristors OLD Part Number Westcode

Medium Voltage Thyristors are optimised for medium voltage applications and series operation. As voltages increase, so do switching losses and turn-off time to a point where they become significant in line frequency applications. Distributed gate architecture ensures excellent switching performance over a wide range of voltage, current and di/dt.

Thyristors ATDK AS ENERGITM are a replacement, analog, alternative for Medium Voltage Thyristors UK Westcode, Littelfuse Technology, formerly Westcode Semiconductors.

"Air-cooled heatsinks O series for disc devices", "Air heatsink SF series", "Water heatsink SS series" for thyristor cooling are also available to order.

Part numbering guide for medium voltage thyristors

youtubeVideo: Reviews of high power disc thyristors

icon AS ENERGITM Semiconductors Manufacturing Reference

OLD Part Number is a product line of thyristors that have been discontinued and are no longer produced, AS ENERGITM offers analogues for OLD Part Number Medium Voltage Thyristors WESTCODE.

Thyristor lifetime is also engineered to achieve an optimum balance between conduction losses, commutation losses and turn-off time to give maximum power handling from line frequency to 400Hz. This also gives significant benefits when series or parallel connection of devices is required.

Medium voltage thyristors are available from 3200V up to 6500V and current from 349A up to 2623A making them particularly suitable for high power converters such as medium voltage DC drives, medium voltage soft starts and utility applications such as HVDC, static VAR compensators, excitation and transfer switches.

The thyristor has an industry standard ceramic housing making it easy to integrate the device into existing equipment. This thyristor has a disc housing with pressure contacts. The polarity of the thyristor is determined by the icon on the case. The technical specifications, part numbering guide, datasheets PDF, outline drawings for thyristors are listed below.

Thyristors AS ENERGITM have the following features: low static and dynamic losses, high values of VDRM/VRRM, extensive experience of using the devices in various industries, range of voltages from 100 to 9000 V and amperages from 10 to 15000 A, high resistance to thermal and electric cycling, natural or forced air cooling.

Our company provides a quality guarantee for thyristors of 2 years from the date of purchase. When supplying thyristors, if necessary, we provide technical passport and certificate of conformity.

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The final price of medium voltage thyristors depends on the voltage class, quantity, delivery terms, manufacturer, country of origin and form of payment.

General specifications of Medium Voltage Thyristors WESTCODE and Replacements

Type V DRM
ITSM I2t VT0 rT Tvj max Package
Data sheet
Part No. Old Part No. V A A A2·s V mΩ ºC mm PDF
K0349LC600 P201CH60 6000 349 4800 115x103 1.568 2.428 115 W10
K0349LC650 P201CH65 6500 349 4800 115x103 1.568 2.428 115 W10
K0769NC600 P410CH60 6000 769 8600 370x103 1.566 1.172 115 W11
K0769NC650 P410CH65 6500 769 8600 370x103 1.566 1.172 115 W11
K0890NC360 R295CH36 3600 890 10900 594x103 1.516 0.800 125 W11
K0890NC420 R295CH42 4200 890 10900 594x103 1.516 0.800 125 W11
K1121NC320 P440CH32 3200 1121 15000 1.13x106 1.098 0.542 125 W11
K1121NC360 P440CH36 3600 1121 15000 1.13x106 1.098 0.542 115 W11
K1197NC300 P480CH30 3000 1197 10646 567x103 1.210 0.430 125 W11
K1197NC320 P480CH32 3200 1197 10646 567x103 1.210 0.430 125 W11
K1947ZC400 P855CH40 4000 1947 25000 3.13x106 1.221 0.425 125 W13
K1947ZC450 P855CH45 4500 1947 25000 3.13x106 1.221 0.425 125 W13
K1947ZD400 P855CH40 4000 1947 25000 3.13x106 1.221 0.425 125 W46
K1947ZD450 P855CH45 4500 1947 25000 3.13x106 1.221 0.425 125 W46
K2095ZC360 P880CH36 3600 2095 18200 1.66x106 1.502 0.296 125 W13
K2095ZC420 P880CH42 4200 2095 18200 1.66x106 1.502 0.296 125 W13
K2095ZD360 P880DH36 3600 2095 18200 1.66x106 1.502 0.296 125 W46
K2095ZD420 P880DH42 4200 2095 18200 1.66x106 1.502 0.296 125 W46
K2359TC600 P1063CH60 6000 2359 27000 3.65x106 1391 0.360 115 W14
K2359TC650 P1063CH65 6500 2359 27000 3.65x106 1391 0.360 115 W14
K2623TC450 R1263CH45 4500 2623 27000 3.65x106 1.421 0.295 125 W14
K2623TC520 R1263CH52 5200 2623 27000 3.65x106 1.421 0.295 125 W14

Part Numbering Guide for Medium Voltage Thyristors:

A TDK 1197 NC 32 0
TDK Product group: Medium Voltage Thyristor (Disc type).
1197 Average on-state current IT(AV), Amp.
NC Housing (package) type.
32 Voltage code VRRM / 100.
0 Fixed turn-off time code.

High Power Semiconductors AS ENERGITM

Our company is engaged in the manufacturer and sale of wide range of power semiconductors (power thyristors, modules, rectifier diodes, avalanche, rotor and welding diodes, triacs etc.) currents up to 15000A and voltages to 9000V, and air and water heatsinks to them.
You can buy semiconductor devices in any volumes, and when ordering large lots, the price will be lower. We have earned the trust of customers and supply products all over the world.

For questions regarding the acquisition of Power Thyristors, Diodes, Modules send an email request to:

[email protected]

And we will provide you a commercial offer for delivery.
For a large number, we will provide an individual price!!!

We are open to manufacture products at our production facilities
according to your requests and technical task.

Photo Gallery

The photo gallery shows many different semiconductor devices, semiconductor chips and SCRs produced by AS ENERGITM, examples of test reports.

Photo of High Power Disc Thyristors:

Installation recommendations for power thyristors:

Assembling disc thyristor with a heatsink

The reliability of heat transfer and electrical contact between the mating surfaces of the thyristor and the cooler over the entire temperature range is ensured by appropriate torque (clamping force).

Before assembly you should perform visual inspection (1) contact surfaces for mechanical damages and wipe (2), soaked with alcohol (toluene, gasoline, acetone).

After inspection, fix the current contacts (leads), install a pin to fix the alignment of the structure.

To improve the parameters of heat transfer it is recommended to lubricate (3) a thin layer of silicone thermal conductive paste before the assembly, which is not a mandatory condition for installation.

Install the thyristor (3), the second part of the cooler, the fiberglass insulator and the thrust washer.

To thread the traverse (4) and evenly tighten the nuts. Make sure no misalignment and evenness of the contact surfaces.

When the parts are sufficiently clamped but moveable, we recommend placing the cooler on a flat surface and checking the tolerance for parallelism of the overall adjacent plane of the surfaces (5).

Clamp each nut in turn (about a quarter turn) to the stop (6). The amount of deflection of the traverse determines whether the achieved clamping force corresponds to the required one.

After installation, the fasteners (nuts and washers) must be additionally secured against corrosion.

Tips and recommendations for power thyristors:

The power thyristors should not be operated for long periods of time at their limit load for all parameters. In this case, the safety factor is determined by the required degree of reliability of the device.

Replace a failed power thyristor with a thyristor that matches the parameters of the one being replaced.

Supercooling must be provided when operating in an environment with an elevated ambient temperature.

Periodic cleaning of power thyristors and coolers to remove dust and contaminants is recommended to ensure proper heat dissipation.

Inductive current dividers (often twisted toroidal wire) should be used to equalize currents between power thyristors connected in parallel. The most popular connection methods are closed circuit, common coil circuit, or power thyristor. The efficiency of current dividers in this case is determined by the cross section of the magnetic wire.

Prevention of voltage unbalance when power thyristors are connected in series is achieved by using shunt resistors connected in parallel with each thyristor. Voltage equalization in transient conditions is provided by connecting capacitors in parallel to each thyristor.

It is strictly forbidden to touch power thyristors under high voltage during operation.

icon Why choose AS ENERGITM

  • Own production facilities, including semiconductor silicon chips production
  • European brand - 100% quality, favorable price, short production terms
  • Over 20 years of experience in the semiconductor industry
  • Clients from more than 50 countries trust us
  • 20000 items in the product line for currents from 10A to 15000A, voltages from 100V to 9000V
  • We produce analogues of other manufacturers' products
  • Guaranteed certified quality, warranty period of operation - 2 years


Quality Warranty

Our products are certified and correspond to international standards.
Our company provides a quality guarantee for products of 2 years.
We provide certificates of conformity, reliability reports, data sheets and technical passports at the request of the customer.


Each product is tested for the main parameters, and Test reports of the parameters for each product are provided.

Test Report

Geography of partnership

AS ENERGITM company manufactures and supplies power semiconductors to more than 50 countries around the world.


Logistics and Delivery

We deliver our products all over the world with the services of logistics companies: DHL, TNT, UPS, EMS, Fedex, Aramex.
Products can be delivered by any means of transport: air, sea, rail and road.


AS ENERGITM Semiconductors Manufacturing

Our products range includes rectifier diodes, phase control thyristors in disc and stud design, avalanche diodes and thyristors, fast switching, high frequency thyristors, fast recovery, welding and rotor diodes, triacs, bridge rectifiers, power modules (thyristor, diode, thyristor-diode, IGBT), and air and water heatsinks to them.

Power diodes and thyristors are produced for currents from 10A to 15000A, voltage range from 100V to 9000V.
Power diode and thyristor modules are produced from 25A and up to 1250A, voltage range 400V - 4400V.
The range of power semiconductors also includes equivalent, replacement, analogue and alternative semiconductor devices of global manufacturers.

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