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PEBS-H-175
PEBS-H-125
PEBS-H-63
PEBS-H-50
PEBS-S-80 (UL)
PEBS-L-175
PEBS-L-125
PEBS-L-125 (UL1077)
PEBS-L-63
MCB Weatherproof Enclosure (PEBS Series)
DC MCCB (PEMC Series)
PEDS (1500V,16~55A) Series
PEDS-H-R/F (1500V,16~55A) Series
PEDS-H (1500V;40A,50A) Series
PEDS-EL (16~55A) / PEDSC-EL (32A)
PEDSC (1000V&1200V;32A) Series
Remote Tripping Isolator (PERD-100/100T series)
DC Combiner Box (PEJB Series)
AC Combiner Box (PEDB Series)
DC&AC Combiner Box (PEJDB Series)
Intelligent PV Combiner Box (PEJB Series)
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Module Level Rapid Shutdown: PROJOY Metal-Enclosed RSD for Safer High-Current PV Systems
Rapid shutdown is mandatory for many rooftop PV installations in markets that have adopted NEC 690.12. Meeting that requirement, however, takes more than installing a rapid shutdown device. A poor-quality RSD may overheat, cause unexpected system downtime or fail to shut down when needed. High-current PV modules, harsh conditions and different system configurations make equipment selection more challenging.
Challenges in Module Level Rapid Shutdown Applications
Module-level rapid shutdown devices face demanding rooftop conditions and varying system requirements. Differences in thermal performance, enclosure durability and shutdown control can affect both everyday reliability and emergency response.
Heat Buildup Beneath Rooftop Panels
Module-level RSDs operate beneath PV panels, where temperatures can be high and airflow is often limited. Higher module currents can add to the thermal load, making heat management more demanding. Inadequate heat dissipation can cause overheating, trigger unexpected shutdowns and place additional stress on internal components, affecting long-term reliability.
Long-Term Exposure to Harsh Rooftop Conditions
RSDs must withstand moisture, dust and repeated temperature changes over years of outdoor operation. Enclosure deterioration, damaged seals and degraded cables or connections can compromise protection against water and dust. These problems can lead to device failures and costly rooftop maintenance.
Ensuring Reliable Emergency Shutdown
Under the voltage-limiting approach in NEC 690.12, controlled conductors must reach 80 V or less inside the array boundary and 30 V or less outside it within 30 seconds of shutdown initiation. Reliable activation under different emergency and fault conditions remains a key challenge. Manual activation and supported automatic shutdown triggers provide different ways to initiate shutdown when needed.
Compatibility Across Different PV System Designs
Module-level RSDs need to match module voltage and current ratings, system configurations and inverter requirements. Differences in control methods, power supply requirements and applicable regulations and certifications can complicate integration. A mismatch can lead to design changes, commissioning delays or shutdown control issues.
PROJOY PEFS-PL Series Metal-Enclosed Module Level RSD
For over a decade, PROJOY has specialized in safety and protection components for PV, energy storage and EV charging systems. It offers module-level and string-level rapid shutdown solutions for different PV system designs. The newly introduced PEFS-PL Series module level RSD supports input currents up to 25 A for high-current PV modules. Its robust metal enclosure helps dissipate heat, while multiple shutdown triggers help reduce electrical hazards for firefighters and maintenance personnel.
Metal Enclosure for Better Heat Dissipation
The metal enclosure helps dissipate heat from internal components, especially beneath PV panels where airflow may be limited. By helping manage heat buildup, it supports safer and more reliable operation.
20 A / 25 A Options for High-Power PV Modules
The PEFS-PL Series RSD offers 20 A and 25 A input current options to suit different PV modules. The 25 A version accommodates higher module currents, giving project teams more flexibility when using high-power solar panels.
Multiple Triggers for Rapid Shutdown
Supports manual shutdown, automatic over-temperature shutdown at 85°C and shutdown following AC power loss through the control system. The RSD completes rapid shutdown within 10 seconds to help reduce electrical hazards.
Flexible Configurations and System Compatibility
Available in 1-to-1, 1-to-2 and 1-to-4 configurations, allowing each device to connect to one, two or four PV modules. Supports mainstream PV modules and compatible inverter systems.
IP68 Protection for Outdoor Conditions
The robust metal enclosure and IP68 protection help withstand demanding outdoor conditions, protecting internal components against dust and water ingress. This supports long-term reliability and helps maintain the shutdown function.
| Specification | PEFS-PL120S-11-M20 | PEFS-PL120S-21-M20 | PEFS-PL120S-11-M25 | PEFS-PL120S-21-M25 |
|---|---|---|---|---|
| PV Inputs | 1 | 2 | 1 | 2 |
| Recommended PV Modules | 2 | 4 | 2 | 4 |
| Maximum Input Current | 20 A | 20 A | 25 A | 25 A |
| Maximum Input Voltage | 120 V | 120 V | 120 V | 120 V |
| Maximum Output Voltage | 80V | 160 V | 120 V | 240 V |
| System Voltage | 1,500 V | |||
| Shutdown Output Voltage | 0V < Volt < 1V | |||
| Control Voltage | 24 V DC | |||
| Operating Temperature | −30°C to +80°C | |||
| Over-Temperature Shutdown | 85°C | |||
| Enclosure Protection | >IP68, NEMA 4X | |||
How to Choose Rapid Shutdown Device for Your PV Project
01
Confirm Regulations and Certifications
Check local rapid shutdown requirements and the certifications needed for the complete system, including the RSD, inverter and control equipment.
02
Match Voltage and Current Ratings
Verify input voltage, current limits and maximum system voltage. Account for cold-weather module voltage and maximum expected current—not just panel wattage.
03
Choose the Shutdown Level and Configuration
Select module-level or string-level shutdown based on the required shutdown scope. Confirm the number of modules supported per device and the permitted wiring configuration.
04
Check Inverter and Control Compatibility
Confirm compatibility with the selected inverter, control equipment and power supply. Different control methods can require different system components and wiring.
05
Verify Shutdown Triggers and Response Time
Review supported manual and automatic triggers. Confirm how quickly the complete system reduces voltage to the required limits after shutdown is initiated.
06
Assess Suitability for Rooftop Conditions
Check operating temperature limits, heat dissipation, enclosure durability and ingress protection. These should suit the site’s heat, moisture and dust exposure.
Why Choose PROJOY for Your Rapid Shutdown Project?
15 Years of PV Safety Expertise
Founded in 2011, PROJOY specializes in safety protection solutions for PV, energy storage and EV charging systems. Guided by “Switch to Safety”, we offer RSD, solar optimizers, ESS, isolators, electrical boxes and a range of electrical protection components.
In-House Technology Development
We develop our own module-level power electronics (MLPE) technology. The new metal-enclosed PEFS-PL Series builds on this expertise with higher-current options, improved heat dissipation and a durable outdoor design.
International Project Experience
PROJOY rapid shutdown solutions have been deployed in PV projects around the world. Beyond rapid shutdown, we also supply protection components to leading brands, including BYD, SolarEdge and LG.
Certified Rapid Shutdown Options
PROJOY rapid shutdown models are ETL-certified to UL 1741 and applicable Canadian standards. Our portfolio also includes models with LVD and EMC compliance verification supporting CE marking.
Frequently Asked Questions About RSD
Why is rapid shutdown important for PV systems?
PV modules can continue producing DC voltage in sunlight even after AC power is disconnected. Rapid shutdown reduces voltage on controlled wiring, helping reduce electric shock hazards for firefighters and maintenance personnel.
What is the difference between module-level and string-level rapid shutdown?
Module-level rapid shutdown interrupts the circuit at individual modules or small groups of modules. String-level rapid shutdown isolates PV strings at selected points, but module-side wiring can remain at high DC voltage.
What upgrades does the PROJOY PEFS-PL Series metal-enclosed RSD offer?
The metal enclosure helps dissipate heat, supporting safer operation and greater durability. Combined with IP68 protection, it suits demanding outdoor conditions. A 25 A input current option also accommodates higher-current PV modules.
What triggers the PROJOY PEFS-PL RSD to shut down?
The RSD supports manual shutdown through a DC 24 V control box, automatic over-temperature shutdown at 85°C and shutdown following AC power loss through the control system. These options allow shutdown to be initiated under different emergency and fault conditions.
How many solar panels can connect to one RSD?
The number depends on the model and permitted wiring arrangement. PROJOY offers 1-to-1, 1-to-2 and 1-to-4 configurations for one, two or four modules per device.
How do I choose the right rapid shutdown device for my PV project?
Check local rapid shutdown requirements, module voltage and current ratings, the number of modules per device, and inverter and control system compatibility. Also confirm shutdown triggers, response time, outdoor ratings and certifications for the intended system configuration.
For product specifications and help choosing the right model, please leave a message using the form below or email us at sales@projoy-electric.com.
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