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ATT-20 Audio Track Transceiver
Zener diodes for suppression of low voltage transients. The STS USA part no. is
N451552-0525.
The surge ripple filter consists of a series line inductor and a four-terminal capacitor with
a selenium suppressor diode across its terminals. The four-terminal capacitor
guarantees loss of power to the load should one of the capacitor leads or plates open.
The line-to-line arresters used across terminals 1 and 2 of the USSP-21 and terminals B
and N of the Surge Ripple Filter are USG-A N451552-0101.
The line-to-ground arresters used across terminals 1 and 5, 2 and 6 of the USSP-21are
USG-A N451552-0201.
Copyright 2019
SM 6299 Rev. 3, March 2019
2-8
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