Hi PAUL IZZO,
They are not TVS diodes
There are Asymmetric Rectifier, Asymmetric Rectifier or Short Protector, as it is sometimes called, is included in the circuit to prevent damage to the high voltage transformer and high voltage capacitor, in case of a short circuit occurring on the magnetron or high voltage diode usually used in Micro ovens The short protector will cause the line fuse to blow in the above fault conditions. As seen in the diagram the device will not conduct in any direction, therefore has no effect on the circuit under normal operating conditions. The peak inverse breakdown voltage of the bigger diode is around 6 kV and the smaller diode is around 1.5kV. Under fault conditions when a short circuit occurs the peak inverse voltage of the smaller diode will be exceeded, this will cause the diode to go short circuit. This in turn will cause a very high forward current through the bigger diode , causing it to go short circuit also. This will cause a dead short to appear across the high voltage transformer secondary, which will blow the line fuse, removing power to the high voltage transformer.
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