PN-250F Datasheet | Hitachi Semiconductor

SM 9080 1000 Technology Drive, Pittsburgh, PA 15219 645 Russell Street, Batesburg, SC 29006 , PN-250F Relay Plug-In Replacement for the PF256 Flasher Relay STS USA Part No. N40116101 - Installation - Operation - Maintenance PN-250F Relay Plug-In Replacement for the PF256 Flasher Relay 1. GENERAL INFORMATION 1.1. Introduction This manual provides installation and operation information for the PN-250F plug-in DC Flasher Relay which is used as a flasher in signal systems. The PN-250F relay (N40116101) (Figure 1-1) was developed as a plug-in replacement for STS USA's PF-256 relay (N322561-XXX). The new PF-250F relay bines a solid state flasher with electromechanical relay contacts to provide a flexible, reliable relay to control the flashing of signals. As a plug-in replacement for the PF-256 relay, except for the flasher frequency selection described in Section 2.3, no wiring or system changes are required to exchange the relays. Figure 1-1. PN-250F Relay Copyright 2019 SM 9080 Rev. 12, March 2019 1-1 PN-250F Relay Plug-In Replacement for the PF256 Flasher Relay 1.2. Description The PN-250F relay is an electronically driven, biased DC relay intended for use in signal flasher service. It uses an electronic flasher module to operate the relay at a selectable flash rate of 45 or 60 flashes per minute. Because the flash rate is electronically controlled, the rate is constant and is no longer dependent on mechanical adjustments. The electronic flasher package is mounted internally and is externally adjustable to provide 45 or 60 flashes per minute. The contact bination is 4NR silver alloy. The armature assembly in the PN-250F is hinged, eliminating the pivot screws and the wear associated with the pivots used in the PF-256. This results in a more reliable unit with longer service life. 1.2.1. Coils The PN-250F relay has a coil resistance of 87.5 ohms. 1.2.2. Contacts The four normal and four reverse contacts are silver alloy to silver alloy rated at 5...