Description
The Simplex 4081-9004 End-of-Line (EOL) Resistor Harness is a wiring accessory designed for supervision of Class B fire alarm circuits. The harness connects at the end of a circuit to allow the fire alarm control panel to monitor wiring continuity and detect open or fault conditions in the field wiring.
End-of-line resistors are required in many fire alarm system circuits to ensure the panel can distinguish between normal conditions, open circuits, and short circuits. The 4081-9004 resistor harness is installed at the remote end of the circuit, where it completes the supervision path used by the control panel to verify circuit integrity.
The assembly consists of a 6.8 kΩ, ½-watt resistor pre-wired with insulated leads and protected by heat-shrink tubing. The resistor leads are crimped to the wiring harness and designed for field installation in system junction boxes or device housings.
The harness includes 18 AWG insulated wires with stripped and tinned ends, making it suitable for integration into fire alarm circuits requiring remote end-of-line supervision. This accessory is part of the Simplex 4081 Series resistor harness family, which provides several resistor values for different circuit supervision requirements.

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