PROJOY PEFS-PL PEFS Fire Switch Instructions

: June 4, 2024
: PROJOY

Table of Contents

PEFS-PL PEFS Fire Switch
Documents / Resources

PEFS-PL PEFS Fire Switch
Instructions Manual

PEFS-PL PEFS Fire Switch

Why Choose Projoy’s PEFS Photovoltaic Rapid Shutdown?
In a photovoltaic power station, as long as there is a light illuminating the solar panel, a voltage of 600~1500V will be generated on the DC side. Although the built-in DC isolator switch in the inverter can cut off the DC power of the inverter, it cannot do anything about the DC power between the solar panel and the inverter.
In the long-term operation of a photovoltaic power station, problems such as poor contact caused by unfastened joints, quality problems of contacts, and aging of insulation parts will directly lead to DC arc phenomena. Unlike the AC arc, the DC arc does not have a zero-crossing point, which means that if a DC arc occurs, the trigger part will maintain stable combustion for a long time without extinguishing. The high temperature generated by the DC arc can be as high as 3000 ℃, which can directly cause a fire. Even if the probability of a DC arc is only 1/1000, a 10MW power station will have 80 times DC arc events during its 25-year power station operation time.
Therefore, with the global popularity of photovoltaic power plants, how to prevent the fire risk of photovoltaic facilities and how to ensure that non- professionals identify and cut off the risk in the first time have become a matter of widespread concern in the photovoltaic industry.
Countries respond to the safety standards of photovoltaic DC high voltage
At present, in developed countries such as the United States, Europe countries, Japan, Australia, etc., compulsory measures have been introduced against the DC high voltage problem in photovoltaic systems.

United States| NEC 690.12 standard requires: 1 foot (304.8mm) from the photovoltaic array as the limit, the voltage within the boundary must be reduced to below 80V within 30 seconds, and the voltage outside the limit must be reduced to below 30V within 30 seconds. This means that if the photovoltaic system needs to enter the building, a quick shutdown device needs to be installed within 1 foot (304.8mm) of the entry point. On the inverter side, if the inverter cannot drop the circuit voltage to 30V internally or isolate the capacitor within 10 seconds, another quick shutdown device needs to be installed within 5 inches (127mm) of the inverter interface.
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Germany| The VDE fire safety standard clearly stipulates that a DC cut- off device should be added between the inverter and the solar panel in the photovoltaic system.
Australia| OVE R11-1: The 2013 regulations requires that there must be a circuit breaker device near the solar panel.
Poland| Photovoltaic systems larger than 6.5kW need to install a DC rapid shutdown device.
China| China Building Material Test & Certification Group Co., Ltd. issued and implemented the requirements of CTS 13001-2018 “Inspection and Evaluation of residential off-grid Photovoltaic Systems”. For residential off- grid photovoltaic systems installed on the roof, when the DC voltage is greater than 120V, a single solar panel or string should be shut off quickly to control the dangerous DC voltage.

Based on market demand, Projoy has successively launched the PEFS-EL series string-level rapid shutdown solution and PEFS-PL series panel-level rapid shutdown solution.

PROJOY PEFS PL PEFS Fire Switch - FIG 1

Projoy’s PEFS-EL string-level rapid shutdown solution
Projoy’s PEFS-EL series rapid shutdown, 1-2 strings, 3-6 strings, and 7-12 strings products can be respectively applied to residential, industrial, and commercial or large-scale photovoltaic systems. The maximum loop voltage can reach 1500V. The built-in advanced temperature sensor can detect the temperature in the shell in real-time. When the internal temperature exceeds 70°C, the switch is automatically cut off. In the event of a fire, firefighters can first turn off the AC power. At this time, Projoy’s PEFS-EL series can quickly shut down the signal collected from the power grid. The disconnection switch will be automatically turned off if the power failure time exceeds 5s, and then the DC power will be cut off.

PROJOY PEFS PL PEFS Fire Switch - FIG 2

The max. loop voltage is 1500Vdc, the max. loop current is 55A, and a 2-12 strings loop can be shut down
Casting plastic shell is optional, IP65 protection level
Active control, safe and reliable
Fire and flame retardant grade UL94-V0 / anti-UV material
High-quality materials, improve the high-temperature resistance, corrosion resistance, and impact resistance of the product
External slide block mounting hole design is easy, convenient, efficient, and stable to install
DC interface has knock-out holes, glands, MC4 optional
Built-in ventilate valve to avoid condensation in the cavity
Built-in isolator switch with TUV, CE, CB, SAA, and UL certification

Porjoy PEFS-PL panel level rapid shutdown solution
Projoy’s PEFS-PL series rapid shutdown is a device that can realize panel- level quick shutdown, and each device can serve 1 or 2 panels. When Projoy’s PEFS-PL is installed in the photovoltaic systems, each panel can be left open. In an emergency, the AC switch or quick-off button can be used to quickly shut down the panels, to ensure the personnel safety of the system or firefighters.

PROJOY PEFS PL PEFS Fire Switch - FIG 3

Lightweight design, buckle installation, simple and convenient, perfect matching panel installation;
Meet UL, NEC NEC 2017/2020 (690.12), SUN SPEC agreement Match LVRT feature of the inverter.
PLC control / DC24V power control optional
One for one, one for two optional
White / orange / black colors are available
Built-in temperature sensor, automatically shut down when over 85℃;
Fire and flame retardant grade UL94-V0 / anti-UV material / IP67 protection grade
High-quality materials, improve the high-temperature resistance, corrosion resistance, and impact resistance of the product
Automatic reset function, it can automatically close after power is restored, no need for manual reset.

Comparison of string-level solution

ProJoy Electric Co., Ltd.
2nd Floor, Building 3, No. 2266, Taiyang Road,
Xiangcheng District, Suzhou, China
Tel: +86 512 6878 6489
Fax: +86 512 6878 6489
Email: sales@projoy-electric.com
www.projoy-electric.com