ADEMCO 4939SN Addressable Contact

( Brand: Ademco ), ( Manufacturer Part Number: 4939SN ), ( Type: Control Panels Keypads )

Review ADEMCO Addressable Contact

The ADemco 4939SN Addressable Contact is a versatile and reliable security device designed for use with addressable fire alarm systems. This contact features a robust design, ensuring it can withstand the rigors of commercial and industrial applications.

The 4939SN is a normally closed (NC) contact, which means it completes the circuit when it is closed, usually when a door or window is shut. It is addressable, which means it can be assigned a unique identification number within the fire alarm system. This feature allows the system to distinguish between individual devices and enhances the overall system performance.

This contact is designed for use with a wide range of applications, including doors, windows, and other types of opening protective devices. It can be used in both single- and multi-zone applications, making it a flexible choice for various fire alarm system configurations.

The ADemco 4939SN Addressable Contact is equipped with a supervised end-of-line resistor, which helps ensure the integrity of the circuit. This resistor sends a continuous resistance signal back to the fire alarm control panel, indicating that the wiring between the contact and the control panel is intact.

The contact is also designed for easy installation. It features a push-in terminal block, which allows for quick and secure connection of wires. The terminal block is labeled, making it easy to identify the proper connection points.

The 4939SN is constructed of high-quality materials and is built to last. It is designed to meet the requirements of UL 268 and UL 1699 standards for fire alarm devices. The contact is also RoHS compliant, making it an environmentally friendly choice.

In summary, the ADemco 4939SN Addressable Contact is a reliable and versatile security device designed for use with addressable fire alarm systems. Its robust design, addressable functionality, and easy installation make it a popular choice for a wide range of applications. Additionally, its compliance with UL 268 and UL 1699 standards and RoHS compliance ensure it meets the highest industry standards for quality and sustainability.

The Ademco 4939SN Addressable Contact is a security device commonly used in addressable fire alarm systems. It is designed to detect the presence of smoke or heat and alert the fire alarm control panel when such conditions are detected. In this response, we will discuss the pros and cons of buying a Ademco 4939SN Addressable Contact.

1. Addressability: The Ademco 4939SN Contact is an addressable device, meaning each device has a unique address assigned to it. This feature allows the fire alarm control panel to identify the exact location of the device that has triggered an alarm, making it easier to respond to emergencies.

2. Superior Sensitivity: The Ademco 4939SN Contact is known for its superior sensitivity, which makes it an ideal choice for areas with high risk for fire or smoke. This device can detect even the smallest amount of smoke or heat, providing an early warning and preventing potential fires from spreading.

3. Tamper Resistant: The Ademco 4939SN Contact is designed with tamper-resistant features, which makes it difficult for unauthorized individuals to disable the device. This feature ensures that the fire alarm system remains functional and effective in preventing fires.

1. Cost: The Ademco 4939SN Contact is a more expensive option compared to conventional non-addressable smoke detectors. This cost may be a significant consideration for those on a tight budget.

2. Installation Complexity: Addressable fire alarm systems require more complex installation compared to non-addressable systems. Installing the Ademco 4939SN Contact may require the services of a professional installer, adding to the overall cost.

3. Maintenance: Addressable devices require regular maintenance to ensure their proper functioning. The Ademco 4939SN Contact is no exception. Regular testing and calibration are necessary to maintain the device's sensitivity and accuracy.

The Ademco 4939SN Addressable Contact is an excellent investment for those who prioritize early fire detection and the ability to pinpoint the exact location of an emergency. Its superior sensitivity, addressability, and tamper-resistant features make it a worthwhile investment for commercial and industrial applications. However, the higher cost, installation complexity, and maintenance requirements may make it less suitable for residential applications or those with limited budgets.

If you are in the market for a high-performance fire alarm device and have the budget and resources to support its installation and maintenance, the Ademco 4939SN Addressable Contact is an excellent choice. Its superior sensitivity, addressability, and tamper resistance make it a reliable and effective tool for preventing fires and ensuring the safety of your property and occupants. However, if cost is a significant consideration or if you require a simpler fire alarm solution, you may want to consider alternative options, such as conventional non-addressable smoke detectors.

Details:

New old stock.

part #: 4939sn prices

• $16.99-$60.00

specifications contrpake:

• brand: Ademco
• mpn: 4939sn
• type: Control Panels Keypads

returns contrpake:

• policy: No Returns

payments contrpake:

• credit card: Diners-club
• other
• wallet: Apple-pay

offer contrpake:

• best offers: True
• options: Ship-to-home
• quantity: 1
• availability: In Stock
• started: February 28, 2026
• sold: 0

general contrpake:

• Surveillance Alarm Equipment > Alarm Systems Accessories > Alarm Control Panels Keypads
• condition: New

seller contrpake:

• rating: 100.0%
• city: Lexington, South Carolina
• # reviews: 152

shipping contrpake:

• carrier: USPS
• class: Standard
• type: Calculated
• transit: 6-10 Days
• service: USPS Ground Advantage
• cost: $5.62

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