These Simplex part number 741-940 Comes In A Set Of 2 With Cable Ties Included and refers to a ferrite bead (also known as a ferrite choke, core, or suppressor) used in fire alarm control panels and related systems. The primary function of a ferrite bead in this application is to suppress high-frequency electromagnetic interference (EMI) noise on communication or power lines, acting as a low-pass filter.

Specific details:

Function: It filters out unwanted high-frequency noise from data or power lines to ensure signal integrity and proper system operation.

Application: These are typically installed on twisted-pair wiring for network or media cards within Simplex fire alarm control panels (such as the 4020, 4100+, 4120, 4100ES).

Usage: The instructions for use often involve looping the twisted-pair wires through the bead to create an effective choke for EMI suppression.  If you have any questions please feel free to message me . Thank you