Kt 728 800

Updated October 6, 2026

Overview

Product sourcing insights & recommendations

23 来源

The phrase "KT 728 800" refers to a legacy electronic component: a Tesla KT 728/800 Triac, a bidirectional thyristor used for high-voltage power switching and control. Originally manufactured by the Czech company Tesla, this component is now considered a "vintage" or obsolete part, largely replaced by modern semiconductors in commercial production.

Core Product Specifications

The KT 728/800 is characterized by its high voltage tolerance and metal casing, which was standard for power electronics in the late 20th century Radiokus Racvonka.

Peak Voltage: 800V
RMS Current: 15A
Gate Current ($I_{GT}$): 100 mA
Package Type: TO-65 (Metal screw-mount)

Market Trends & Availability

The market for the KT 728/800 has shifted from mainstream industrial use to two specific niches:

1Maintenance & Repair: High demand persists in Eastern Europe (Czech Republic, Hungary) for repairing legacy machinery where the metal TO-65 casing is critical for mounting and heat dissipation Aukro Aukro.
2Modern Equivalents: Modern B2B markets have fully transitioned to plastic-packaged triacs, which are significantly cheaper and more efficient. The most direct replacements found on platforms like Alibaba include the TIC 263 N and BT139-800E Alibaba Alibaba.

Sourcing Strategy & Recommendations

For Vintage Repair: Limited stock is still available through specialty electronics retailers in the EU, typically priced between $1.80 – $6.50 per unit Radiokus Racvonka.
For New Designs/Volume Sourcing: It is recommended to switch to modern equivalents. The BT139-800E (16A, 800V) is the most widely available wholesale option, with prices as low as $0.10 - $0.42 in bulk Alibaba Alibaba.
Technical Note: When replacing the original metal-case KT 728/800 with a modern plastic TO-220 or TO-218 component, you must account for the different mounting styles and potential need for electrical insulation from the heatsink.

Based on the data found, here are your next steps:

Sources & References

23 sources cited · Verified industry data & reports

KT 728/800 triak , 800V / 15A

Radiokus.cz

Triak 15A , 800V , TO65 · Parametry · Hodnocení 0 · KT 728/800 triak , 800V / 15A. Není skladem. 75 Kč. / ks. 61,98 Kč bez DPH.

TESLA TRIAK KT 728 / 800 - 1 DB

Aukro.hu

TESLA TRIAK KT 728 / 800 - 1 DB 620 Ft-ért. Vedd meg most az Aukrón kedvező áron. Ellenőrzött eladók és biztonságos Aukro-fizetés.

650 5 vicevrstvé spínací součástky - kt 728/400, ...

MekWeb

KT 728/800. A ŘÍZENÍ. ТРИАКИ ДЛЯ БЕСКОНТАКТНОГО ПЕРЕКЛЮЧЕНИЯ И УПРАВЛЕНИЯ • TRIACS FOR CONTACTLESS SWITCHING AND CONTROL. ⚫ TRIACS FÖR KONTAKTLOSE SCHALTUNG ...

Informace o položce:TIC 263 N [nahr za KT 728/800]

Buček - elektronické součástky

Položka : TIC 263 N [nahr za KT 728/800] ; Popis : Triak 800V 25A Igt<50/<40mA TO218 ; Oddělení : Triaky, Cena : 90.00 Kč.

Tyristory, triaky - RaC Vonka

racvonka.cz

KT 728 / 800, 800 V, 15 A, 100 mA, kovové, 150,00 Kč. KT 729 / 700, 700 V, 10 A, 80 mA, kovové, 38,00 Kč. KT 729 / 800, 800 V, 10 A, 80 mA, kovové, 53,00 Kč. KT ...

TESLA TRIAK KT 728 / 800 - 1 KS

Aukro

TESLA TRIAK KT 728 / 800 - 1 KS za 40 Kč. Kup teď na Aukru za výhodnou cenu. Prověření prodejci a bezpečná Aukro platba.