Industrial 251-F7Z-06K NSNBC01 Safety Relay Module

251-F7Z-06K NSNBC01 Fail-Safe Safety Interlock Switch (GuardSwitch) from Sentrol/GE Security is a non-contact safety interlock designed to secure machine guards and doors, featuring a watchdog fuse circuit that guarantees an open condition if the guarded path is breached. The watchdog circuit can draw up to 4 A to blow the fuse within about 200 ms, delivering a rapid, verifiable safety response in fault conditions. Electrical specs include a 100 VA load rating at 100–120 V AC, with a maximum switch current of 0.83 A and a contact resistance of approximately 0.5 Ω; the device uses a normally open contact configuration. The sensing geometry provides a nominal sensing range of 1.0 inches (2.5 cm) and a nominal break range of roughly 2.2 inches (6.8 cm), with a nominal lead length of 6 feet (1.8 m) for the standard configuration. Intended for industrial safety interlock applications on guard doors and similar safety boundaries, this GuardSwitch is commonly used to interface with safety relays or monitoring systems in packaging lines, presses, and automation equipment to enforce safe access control and immediate shutdown on guard entry. The 251-F7Z-06K variant specifies the 6-foot lead length, and the NSNBC01 suffix identifies a specific catalog entry for this part number.