Phase Control Thyristor T243-400 (3400 – 4200V)

Average forward current, ITAV 400A
Voltage, VDRM/VRRM 3400–4200V
Voltage code, VRRM / 100 34 – 42
T243-400 on request
Dimensions ØD×Ød×H
60x38x20 mm
Weight 240 g
Datasheet Datasheet

Phase Control Thyristor T243-400 AS ENERGITM is general purpose disc thyristor, also known as Silicon Controlled Rectifier (SCR). This is a power thyristor designed for converting and control DC and AC currents up to 400A with frequency up to 500Hz in circuits with voltages up to 3400V – 4200V (voltage class from 34 to 42). Thyristor dimensions ØDxØdxH – 60x38x20 mm (outer case diameter X contact surface diameter X case height), weight – 240 g.

Thyristor ratings: T243-400-34 (400A 3400V), T243-400-36 (400A 3600V), T243-400-38 (400A 3800V), T243-400-40 (400A 4000V), T243-400-42 (400A 4200V).

The anode and cathode of the thyristor (polarity) are determined by the symbol on the case. Thyristors are in a press pack disc (capsule, tablet) housing. This SCR thyristor can be an alternative product, replacement, analog, equivalent for other types thyristors 350A, 370A, 390A, 400 amp in a disk package.

For cooling during the operation of power thyristors they are mounted with coolers (heat sinks). Depending on the amount of heat generated and the working conditions of the semiconductors, either natural air flow cooling or forced cooling can be used.

When assembling, the necessary clamping force Fm specific for each type of thyristor case (indicated in the parameter table) must be provided.

Thyristors SCR disc type are used in power equipment – power and control units, power regulators, converters (e.g. melting furnaces), controllers where fast switching and control of currents is necessary.

Specifications and parameters, datasheets PDF, sample technical passport, dimensions, outline drawings, case diagrams thyristors, recommended coolers are listed below.

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

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

General specifications of phase control thyristors T243-400:

Thyristor specifications T243-400
Maximum allowable average forward current (Case temperature) IT(AV) (Tcase) 456 A (85ºC)
558 A (70ºC)
Repetitive peak off-state voltage; Repetitive peak reverse voltage VDRM/VRRM 3400-4200 V
RMS on-state current ITRMS 876 A
Surge on-state current ITSM 6.0 kA
Safety factor I2t 180 kA2·s
Peak on-state voltage, max VTM 2.30 V
Peak on-state current ITM 1257 A
On-state threshold voltage, max VT(TO) 1.150 V
On-state slope resistance, max rT 1.270 mΩ
Turn-off time, max tq 400 µs
Repetitive peak off-state and Repetitive peak reverse currents, max IDRM/IRRM 70 mA
Critical rate of rise of off-state voltage, min (dVD/dt)cr 500-2000 V/µs
Gate trigger direct voltage, max VGT 2.5 V
Gate trigger direct current, max IGT 250 mA
Critical rate of rise of on-state current (diT/dt)cr 200 A/µs
Temperature of p-n junction, max Tvj max 125 ºC
Thermal resistance, junction to case, max Rth(j-c) 0.034 ºC/W
Clamping force Fm ±10% 15 kN
Weight, approx. W 240 g
Package type, Dimensions ØDxØdxH PT42
60x38x20 mm
Recommended heatsinks Heatsinks O143, O243, O343, OM103, OM104
Datasheet PDF PDF

Part Numbering Guide for SCR Thyristors T243-400:

T 243 400 42 5 2
T Thyristor, brand AS ENERGITM
243 Thyristor type (disc type).
400 Average current in open state IT(AV), Amp.
42 Voltage class VRRM / 100  (Nominal voltage – 4200 V).
5 Parameter of the critical rate of rise of off-state voltage (dVD/dt)cr:
Alpha-numeric coding P2 K2 Е2 A2 T1 P1 M1
Digital coding 4 5 6 7 8 9
(dVD/dt)cr, V/µs 200 320 500 1000 1600 2000 2500
2 Parameter of turn-off time tq:
Alpha-numeric coding 0 B2 C2 E2 H2 K2 М2 P2 T2 X2 A3
Digital coding 0 1 2 3 4
tq, V/µs not standardized 800 630 500 400 320 250 200 160 125 100

Polarity (anode, cathode, gate) and dimensions of disc thyristor T243-400:

Thyristor polarity Dimensions

Thyristor T243-400 datasheet:

PDFDownload pdf datasheet for thyristors T243-400

Technical Passport for Phase Control Thyristors (sample):

When supplying thyristors, if necessary, we provide technical passport and certificate of conformity.

  • Technical Passport
  • Technical Passport
  • Technical Passport

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, rotor and welding diodes, triacs etc.) currents up to 15000A and voltages to 9000V, and air and water heatsinks to them. You can buy semiconductors in any volumes, and when ordering large lots, the price will be lower.
We have earned the trust of customers and cooperate with companies from neighboring countries.

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

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.

Heat sinks for power disc thyristors:

Heat sinks (radiators) are used for single- and double-sided cooling of power semiconductor devices in disc design.

Heat sinks of coolers are made of aluminum radiator profiles and do not require additional protective coating when used in various climatic conditions.

See for more information about coolers "Air-heatsink" and "Water-heatsink".

Photo of Phase Control Thyristor SCR:

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