43543 FUNCTIONAL DEVICES Esrn Emergency Lighting Bypass Shunt

Review FUNCTIONAL DEVICES Esrn Emergency Lighting Bypass Shunt Relay 120/277v

The 43543 ESERN Emergency Lighting Bypass Shunt Relay is a functional device designed to ensure uninterrupted operation of emergency lighting systems during power outages or maintenance work. This essential component is UL listed for 120/277 Volt applications, making it a reliable choice for commercial and industrial settings.

The bypass shunt relay functions by allowing normal power to bypass the emergency battery during regular operation, while automatically switching to battery power when the primary power source fails. This seamless transition ensures that emergency lights remain operational during power disruptions, providing safety and compliance with relevant codes and regulations.

The 43543 ESERN Emergency Lighting Bypass Shunt Relay comes with a robust, durable design, featuring corrosion-resistant contacts and a solid-state trip mechanism. Its compact size and sleek form factor make it easy to install and integrate into existing electrical systems.

The relay operates on a simple principle: it monitors the primary power source and automatically switches to battery power when a power loss is detected. It does this by utilizing a sensitive voltage sensing circuit that can detect even the slightest voltage fluctuations, indicating a power failure. Once the power failure is detected, the contacts inside the relay switch, allowing the emergency backup power to flow through the system and keep the emergency lights operational.

This bypass shunt relay is a critical component for ensuring the safety and compliance of emergency lighting systems in a wide range of applications, from small retail spaces to large commercial buildings and industrial facilities. By providing uninterrupted power to emergency lights during power outages, it helps maintain a safe environment and protects against potential liability issues.

In summary, the 43543 ESERN Emergency Lighting Bypass Shunt Relay is an essential functional device designed to keep emergency lighting systems operational during power disruptions. Its UL listing for 120/277 Volt applications, robust design, and automatic power failure detection make it a reliable and effective solution for ensuring safety and compliance in commercial and industrial settings.

Functional Devices 43543 ESERN Emergency Lighting Bypass Shunt Relay (120/277V) is a component used in emergency lighting systems to bypass the normal power supply and switch to battery power during an outage. Here are some pros and cons of buying this relay:

1. Compliance with UL924 Standard: This bypass shunt relay is UL924 listed which means it meets the safety and performance standards required for emergency lighting systems in the US.

2. Reliable Operation: The relay is designed to provide reliable operation during power outages, ensuring that emergency lighting systems function as intended.

3. Easy Installation: The relay is relatively easy to install, making it a cost-effective solution for upgrading or maintaining emergency lighting systems.

4. Versatile Application: The 120/277V voltage range of this relay makes it suitable for use in a wide range of emergency lighting systems.

1. Limited Functionality: This bypass shunt relay is specifically designed for emergency lighting systems, and it may not be suitable for other applications.

2. Additional Cost: While the relay itself may be relatively inexpensive, the cost of purchasing and installing it can add up, especially when considering the cost of labor and other related expenses.

3. Requires Regular Maintenance: Like all electrical components, the bypass shunt relay requires regular maintenance to ensure proper functioning. This can include periodic testing, cleaning, and replacement of worn parts.

The Functional Devices 43543 ESERN Emergency Lighting Bypass Shunt Relay (120/277V) is an essential component for maintaining reliable emergency lighting systems. While it may require additional cost and maintenance, the peace of mind that comes with knowing that emergency lighting will function during power outages makes it a worthwhile investment.

If you are in the market for an emergency lighting bypass shunt relay, the Functional Devices 43543 ESERN model is a reliable and cost-effective option. However, it is important to ensure that you have the necessary expertise and resources to install and maintain the relay properly. If you are unsure about the installation process or have any questions about the suitability of this relay for your specific application, it is recommended that you consult with a qualified electrician or emergency lighting specialist.

Details:

Item mpn: 43543. This listing is for Functional Devices esrn emergency lighting bypass shunt relay UL924 120/277vbrand new condition in original box please refer to photo more details as they are the best part of. Item brand: Functional Devices.

specifications genpurrelays:

• brand: Functional Devices
• mpn: 43543
• part type: Emergency
• item length: 10.000
• item height: 4.000
• item width: 7.000

general genpurrelays:

• category: Business & Industrial > Electrical Equipment Supplies > General Purpose Relays

seller genpurrelays:

• rating: 99.8%
• city: cass city, michigan
• # reviews: 326181

shipping genpurrelays:

• transit: 3-7 days
• type: fixed
• service: fedex ground economy, ups 2nd day air
• class: economy, expedited
• carrier: fedex, ups

payments genpurrelays:

• wallet: apple-pay
• credit card: mastercard
• other

returns genpurrelays:

• policy: returns accepted
• paid by: buyer
• time: 30 days
• method: money back

offer genpurrelays:

• availability: in stock
• sold #: 6
• started: march 9, 2026
• quantity: 14
• options: ship-to-home