3PM

The 3PM is a single-phase, 3.2 A silicon rectifier bridge of monolithic construction, one of the bridges (1PM, 3PM, 20PM, 45PT2) IPRS Băneasa was making in December 1978 and meant to keep in production in 1981–1985 [1]. IPRS made rectifier bridges of its own design from 1977, to reduce assembly work and cost and raise the reliability of power supplies [1].