POSISTOR BLOCKS OF PROTECTION
OF AUTOMATIC TELEPHONE EXCHANGES

V. N. Shut,a D. A. Il'yushchenko,b 
S. R. Syrtsov,a and A. V. Gavrilova 

UDC 621.316

The thermal and electrical parameters of posistor blocks 
or protection of automatic telephone exchanges have been investigated. 
A mathematical model making it possible to optimize the posistor parameters 
for designing protective blocks with required characteristics has 
been proposed.

aInstitute of Engineering Acoustics, National Academy 
of Sciences of Belarus, 13 Lyudnikov Ave., Vitebsk,210023, Belarus; 
b"MONOLIT" Production Association,145 Gorkii Str., Vitebsk, 
210064, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 79, 
No. 5, pp. 88-93, September-October, 2006. Original article submitted 
October 26, 2004; revision submitted December 31, 2004.