---
description: Complete range of RSD and fire safety switch products that meets NEC standards. ISO9001-certified facility. Smart over-voltage protection for fire safety. Talk to us.
title: Premium Rapid Shutdown Device Firefighter Safety Switch Supplier | BENY New Energy
image: https://www.beny.com/wp-content/uploads/2025/01/Beny-Firefighter-Switch-Installation.jpg
---

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- **String Level Rapid Shutdown Device**

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- **String Level Rapid Shutdown Device**

# String Level Rapid Shutdown Device

## RAPID Shutdown, Steadfast Security

[![未标题 2 0005 01]()](https://www.beny.com/product-item/firefighter-safety-switch-bfs-s/)

### [Firefighter Safety Switch String Level Rapid Shutdown Device BFS-S](https://www.beny.com/product-item/firefighter-safety-switch-bfs-s/)

The BFS-S Series String-Level Firefighter Safety Switch stands as a paramount DC disconnect solution specifically designed for safeguarding rooftop solar systems. This innovative device ensures complete isolation of DC power when faults occur. It features proactive responses to system faults like grid AC power loss and over-temperature (≥85℃). Additionally, it can stably operate in harsh environments with an IP66 enclosure and boasts a plug-and-play design.

## Ensuring System’s Secure Operation

Connect 1 to 4 input and output solar panel strings, with independent positive and negative poles, to the string-level firefighter safety switches. Simultaneously, connect the switches to the inverter, thereby achieving DC current isolation between the panels and the inverter.

 

If a fault occurs like over temperature, it will swiftly disconnect the current. Also, when the switch detects AC power loss, it promptly responds by disconnecting the DC side current to safeguard the equipment and the system.

![图片3]()

## Why Choose Beny Firefighter Safety Switch

- Rapid shutdown

Realizing string-level rapid shutdown of 1-4 strings; up to 1500VDC, 50A per string

- Proactive Actions

Achieving automatic shutdown when detecting an AC power loss and over temperature ≥85℃

- IP66 Protection Rating

Aluminum enclosures with breathing valves for stable operation in harsh environments

- Long Service

Fire retardant and anti-UV materials that ensure the stability and longevity

- Authorized Recognition

Firefighter safety switches are TUV Rheinland and CE-certified; internal isolator switches are RoHS and UL-certified

- Plug and Play

Adopting MC4 cables makes installation much easier

![加水印 画板 1]()

## CE and TUV Rheinland Certified<br>

Beny takes pride in its commitment to delivering cutting-edge firefighter safety switches that have received certifications from globally recognized organizations such as TUV Rheinland and CE. Their internal isolator switches are UL and RoHS-certified, ensuring quality, safety, and performance.

## Crucial Importance of Safety Switches

Firefighter safety switches are critical components in photovoltaic (PV) systems for enhancing safety and mitigating potential hazards. In the event of an over temperature or other emergency, they ensure that the electrical currents within the solar cell string are rapidly interrupted, reducing the risk of electrical shock and providing first responders with a safer environment. With the integration of button switches, manual shutdown in situations such as system maintenance can be realized.

![图片2]()

## Quick Installation Guide

![Beny Firefighter Switch Installation]()

Select and install the firefighter safety switch in place

Press the Emergency Button to keep AC circuit pre-disconnected

Connect the switch to the AC Main Power

Test before use  
After AC Power is connected, the Red Light is still OFF.  
Release the Emergency Button and the Red light is ON. The Switch Indicator turns GREEN to RED within 60 seconds.  
Press the Emergency Button after 60 seconds, and the Red light is OFF with the Switch Indicator turning RED to GREEN

Connect the firefighter safety switch to PV arrays  
Before connecting to PV arrays, make sure BFS-S is at “OFF” status. (Red Indicator is OFF and the Switch Indicator is GREEN.)

All EVO2 connectors must be installed and sealed properly with isolator to maintain IP66NW rating.

## Empower Efficiency: Unleash Quality Solar PV Protection and Electric Car Charging.

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- [Rapid Shutdown](https://www.beny.com/module-level-rapid-shutdown/)

#### Service

- [Consulting](https://www.beny.com/consulting/)
- [Product Design](https://www.beny.com/product-design-development/)
- [Manufacturing](https://www.beny.com/manufacturing/)
- [Technical Support](https://www.beny.com/technical-support/)

- [Consulting](https://www.beny.com/contact-us/)
- [Product Design](https://www.beny.com/product-design-development/)
- [Manufacturing](https://www.beny.com/manufacturing/)
- [Technical Support](https://www.beny.com/technical-support/)

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#### Contact Info

- Changjiang Rd, Wenzhou Daqiao Industry Park, Beibaixiang Town, Yueqing, Wenzhou City, Zhejiang Province, China, 325600

- info@beny.com
- +86-577-57177008

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