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Simplex 2081-9010 End-of-Line (EOL) Resistor

Name: Simplex 2081-9010 End-of-Line (EOL) Resistor
SKU: 2081-9010
Availability: InStock

$50.00

The Simplex 2081-9010 is a 3.3K-ohm end-of-line (EOL) resistor for compatible Simplex fire alarm circuits. Installed at the end of a supervised circuit, it provides the resistance required for the fire alarm control equipment to monitor field wiring integrity and detect open or abnormal circuit conditions.

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SKU: 2081-9010 Category: Accessories Brand: Simplex

Miami

The Simplex 2081-9010 is a 3.3K-ohm End-of-Line (EOL) resistor used with compatible Simplex fire alarm systems. Current Johnson Controls price documentation specifically identifies part number 2081-9010 as “EOL RESISTOR/3.3K.”

This corrects the identification in my previous response: 2081-9010 is an EOL resistor, not a firefighter telephone phone jack. The similar-looking 2084-9001 is identified in Johnson Controls documentation as a remote phone jack.

Product Functions

Provides end-of-line resistance for compatible fire alarm circuits
Resistance value of 3.3K ohms / 3,300 ohms
Supports supervision of fire alarm field wiring
Allows compatible control equipment to monitor circuit continuity
Helps identify open-circuit wiring conditions
Provides the expected normal supervisory resistance at the end of the circuit
Used with compatible Simplex fire alarm equipment
Installed at the electrically supervised end of the applicable circuit
Passive electrical component requiring no separate power supply
Intended to maintain the circuit termination value specified by Simplex

Government and Johnson Controls product schedules consistently identify the 2081-9010 specifically as a 3.3K EOL resistor.

End-of-Line Circuit Supervision

The primary purpose of the 2081-9010 is to provide a known electrical resistance at the end of a supervised fire alarm circuit.

A compatible fire alarm control circuit monitors this resistance to determine the condition of its field wiring. Under normal conditions, the control equipment sees the expected EOL resistance.

If field wiring becomes disconnected or broken, the resistance observed by the control equipment changes substantially, allowing the system to identify an abnormal condition.

The EOL resistor therefore contributes to electrical supervision rather than performing smoke, heat, manual alarm, or notification functions itself.

Resistance Value

Nominal Resistance: 3.3 kΩ

Equivalent values:

3.3 kΩ = 3,300 Ω

Multiple Johnson Controls and government procurement documents explicitly identify:

2081-9010 — EOL RESISTOR/3.3K.

This resistance value is important. An EOL resistor with a different value should not be substituted unless the documentation for the specific fire alarm circuit explicitly permits it.

Fire Alarm Circuit Application

The 2081-9010 is intended for circuits specifically designed to use a 3.3K-ohm end-of-line resistance.

Depending on the Simplex equipment generation and system configuration, EOL resistors may be associated with supervised fire alarm circuits such as initiating, monitoring, notification, control, or other field circuits.

However, 2081-9010 should not automatically be assumed compatible with every Simplex circuit simply because it is a Simplex EOL resistor.

The required EOL resistance must match the documentation for the specific control panel, module, or circuit.

End-of-Line Placement

An EOL resistor normally needs to be installed at the electrical end of the supervised field circuit, rather than directly at the control panel.

This arrangement allows the control equipment to supervise not only the resistor but also the field wiring leading to it.

Installing an EOL resistor at an incorrect location can prevent the system from properly supervising portions of the field wiring.

Installation should therefore follow the wiring diagram for the particular Simplex control panel or module.

Passive Operation

The Simplex 2081-9010 is a passive electrical component.

It does not independently contain:

Addressable electronics
Smoke detection circuitry
Heat detection circuitry
Relay contacts
Audible notification circuitry
Visual notification circuitry
Network communication
MAPNET/IDNet addressing
User controls

Its function is to provide the required electrical resistance for circuit termination and supervision.

Electrical Specifications

Component Type: End-of-Line Resistor
Nominal Resistance: 3.3 kΩ
Nominal Resistance in Ohms: 3,300 Ω
Function: Supervised circuit termination
Separate Power Supply: Not required
Addressable: No
Polarity: A conventional resistor itself is non-polarized

A wattage/tolerance specification specifically tied to the legacy 2081-9010 was not established in the authoritative product schedules located, so it should not be inferred.

For comparison only, Simplex’s later 4100ES service-parts documentation identifies 4081-9002 as a 3.3K-ohm, 1 W, 5% EOL harness. That specification belongs to 4081-9002 and should not automatically be assigned to 2081-9010.

2081-9010 vs. 2081-9010C

Simplex/Johnson Controls documentation also identifies a related:

2081-9010C — EOL Resistor 3.3K, Plastic.

Independent industrial-parts documentation describes the 2081-9010C as an end-of-line resistor rated for 0.02 A at 24 VDC.

The 2081-9010 and 2081-9010C should therefore be cataloged as distinct part numbers, even though both are associated with 3.3K EOL applications.

Related Simplex EOL Resistors

Simplex has produced numerous EOL resistor values for different fire alarm circuits.

For example, Johnson Controls documentation identifies:

2081-9008: 22K EOL resistor
2081-9010: 3.3K EOL resistor
2081-9016: 22K EOL resistor, Canada
2081-9010C: 3.3K EOL resistor, plastic
2081-9053: four 6.8K, 1/2W resistors
2081-9060: four 10K, 1/2W resistors.

The resistor value specified for the actual fire alarm circuit should always control product selection.

Installation Information

Typical installation involves:

Identifying the circuit requiring EOL supervision
Confirming that the specified resistance is 3.3K ohms
De-energizing or placing the fire alarm system in the appropriate service condition
Locating the electrical end of the supervised circuit
Connecting the 2081-9010 across the appropriate field terminals/conductors
Securing and insulating connections as required
Restoring the system
Confirming normal circuit status
Testing for proper trouble supervision
Verifying the system recognizes an intentional open-circuit condition
Restoring the circuit and confirming return to normal

The exact connection method should follow the documentation for the associated Simplex control panel or interface module.

Testing & Maintenance

Inspection should verify:

Correct 3.3K resistance value
EOL resistor remains installed
Connections are secure
Leads are not damaged
No corrosion is present
No conductor is shorted across the resistor
Resistor remains at the actual end of the supervised circuit
Fire alarm panel reports normal circuit condition
Open-circuit supervision operates correctly
Circuit returns to normal after testing

When troubleshooting, resistance measurements should be interpreted according to the circuit documentation and with appropriate consideration for other connected field devices.