Union Switch & Signal originally developed the PN-150EVT electronic vital timer relay to serve as a solid-state replacement for thermal and mechanical timer relays. The PN-150EVT's electronic module and contacts, which are in a three-front/one-back arrangement, are fitted into a standard US&S PN- 150-style relay frame. In order to offer a solid-state timer that can drive an external relay with more contacts, so that it can be suitable for a wider variety of applications, US&S has developed the PN- 150SST Solid-State Timer.
The US&S PN-150SST Solid-State Timer consists of an electronic module mounted in a standard US&S PN-150 relay frame. The timer's electronic module is the same as the one used in the PN-150EVT unit and includes a digital display. Because it's designed to drive an external vital relay, the PN-150SST contains no relay contacts. As such, it's a direct replacement for the US&S Flexikron® line electronic timers. line electronic timers.
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