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Solar Product CapabilitiesTraining December 2020

Product Catalog

Document Information

Document Title Solar Product CapabilitiesTraining December 2020
Document Type Product Catalog
File size 1.4Mb
Company Mouser Electronics (Documents List)

Document Contents

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Solar Product Capabilities Training December 2020 1
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With over 25 million devices installed in photovoltaic power systems, Littelfuse understands the challenges facing the solar market. Our solar-rated solutions protect equipment and systems subjected to harsh, photovoltaic installations. Confidential and Proprietary | Littelfuse, Inc. © 2020 2
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Photovoltaic Applications
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Photovoltaic (PV) System Applications Overview Confidential and Proprietary | Littelfuse, Inc. © 2020 4
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Fuse Selection Table (Grounded System) String Protection Array Protection String Combiner/HC Voltage Wire Harness/HC Homeruns Array Combiner/Central Inverter Combiners/String Inverter SPXI (25 A – 32 A) SPXV (25 A – 32 A) SPXI (35 A to 60 A) SPXV (35 A to 60 A) Fuse: SPNH (70 A – 400 A) 1500 V SPXI (2.5 A – 20 A) SPXV (6 A – 20 A) Holder: LFNH15200FBC Holder: N/A Holder: LPXV/LFXV SPFI (2 A – 30 A) SPF (1 A – 30 A) SPFJ (70 A – 450 A) 1000 V Holder: N/A Holder: LPHV Holder: LFJ1000 Series Confidential and Proprietary | Littelfuse, Inc. © 2020 5
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Fuse Selection Table (Ungrounded System) PV Panels in an String Array Combiners SE-601 String Protection Array Protection String Combiner/HC Voltage Wire Harness/HC Homeruns Array Combiner/Central Inverter Combiners/String Inverter SPXI (25 A – 32 A) SPXV (25 A – 32 A) SPXI (35 A to 60 A) SPXV (35 A to 60 A) Fuse: SPNH (70 A – 400 A) 1500 V SPXI (2.5 A – 20 A) SPXV (6 A – 20 A) Holder: LFNH15200FBC Holder: N/A Holder: LPXV SPFI (2 A – 30 A) SPF (1 A – 30 A) SPFJ (70 A – 450 A) 1000 V Holder: N/A Holder: LPHV Holder: LFJ1000 Series Confidential and Proprietary | Littelfuse, Inc. © 2020 6
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Why Solar Fuses?
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Why Solar Fuses are Unique ▪ Higher dc voltages – typically 450 - 1500 V dc for better efficiency ▪ Improved thermal cycling – to withstand repeated daytime/nighttime temperature variations ▪ Harsher ambient temperatures – may range from -40 ˚C to 90 ˚C ▪ Better protection for low-overload currents – lower currents are not always protected by high-voltage or semiconductor fuses ▪ Better longevity and reliability – when compared to general-purpose fuses 8 Confidential and Proprietary | Littelfuse, Inc. © 2020 8
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Solar Standards Require Additional Testing ▪ UL 2579 (UL 248-19) and IEC 60269-6 Standards require testing beyond those for general-purpose fuses to simulate service environment conditions of a photovoltaic (PV) installation ▪ Additional testing verifies… • Fuse interrupting capabilities • Functionality at temperature extremes • Current cycling to assure reliability and longevity when subject to constant temperature changes and current loads Confidential and Proprietary | Littelfuse, Inc. © 2020 9 9
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Failure Mode – Reverse Overcurrent Reverse Overcurrent Negative Positive Normal Current Flow The purpose of this demonstration is to show the dangers of reverse overcurrents on a solar panel without the proper fuse protection. Confidential and Proprietary | Littelfuse, Inc. © 2020 10
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String Protection Reverse Overcurrent Combiner Box Grid-tied inverter with no utility backfeed 1. Normal flow of current 2. Fault occurs 3. Backfeed current 4. Uncontrolled backfeed current heats panels and ignites 11
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String Protection Protected Reverse Overcurrent Combiner Box Grid-tied inverter with no utility backfeed 1. Normal flow of current 2. Fault occurs 3. Backfeed current 4. String 1 fuse prevent reverse-current damage to panels in string 1 Note: GFDI fuse in Inverter may also open depending on fault location and path 12
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Array Protection System Configuration String Panels Combiner s Array Combiner ▪Multiple arrays are combined to form a complete PV system ▪Power runs through a DC to AC inverter and out to the grid ▪Properly protected systems employ fuses on the string and array combiners 13
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Array Protection Reverse Overcurrent on Unprotected Array String Panels Combiners Array Combiner Fus Fuse 1e – Monitor 5A 1. Normal flow of current 4. Second fault occurs 2. Ground fault occurs 5. Reverse overcurrent 3. System functions normally 6. Uncontrolled reverse overcurrent (ground-fault remains undetected) ignites cable 14
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Array Protection Reverse Overcurrent on Fuse Protected Array String Panels Combiner s Array Combiner Fus Fuse 1e – Monitor 5A 1. Normal flow of current 4. Second fault occurs 2. Ground fault occurs 5. Reverse overcurrent 3. System functions normally 6. Combiner fuse opens and system (ground-fault remains undetected) returns to normal functioning state 15
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Solar Fuses Overview
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Solar Fuse Line Product SPXV SPXI SPNH SPF SPFI SPFJ Series String Style In-Line Style NH Style Midget Style In-Line Style Array Series Voltage 1500 V dc 1500 V dc 1500 V dc 1000 V dc 1000 V dc 1000 V dc Ratings Amperage 70 to 450 A 1 to 60 A 1 to 60 A 70 to 400 A 1 to 30 A 2 to 30 A Ratings Interrupting 30 kA 50 kA 15 kA 20 kA 20 kA 10 kA & 20 kA Ratings LFPXV Fuse Holder NA LFNH LPHV NA LFJ1000 LFXV15 (35–60 A) Approvals UL Recognized, CSA, CE, RoHS Confidential and Proprietary | Littelfuse, Inc. © 2020 17
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Relays, Surge Protective Devices & Dc Disconnect Switches Overview
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EL731 Series: Earth Leakage Relays ▪ Ground-fault detection ▪ Adjustable ground-fault pickup (30 mA - 5A) and time delay (for coordination) ▪ Panel mountable (surface and DIN-rail mountable with optional kit) ▪ Three Form C output contacts ▪ Analog or digital outputs ▪ CT-Loop monitoring ▪ Harmonic filtering ▪ 0 - 6,000 Hz frequency range Confidential and Proprietary | Littelfuse, Inc. © 2020 19
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SE-601 Series: Ground-Fault Relays ▪ Adjustable ground-fault pickup (1 - 20mA) and delay ▪ Available in 24, 48, 120/240 V dc models ▪ Microprocessor based; no need for calibration ▪ Features output contacts for trip circuits ▪ Non-volatile trip memory ▪ Limit ground fault currents to 25 mA ▪ Panel, surface and DIN-rail mountable Confidential and Proprietary | Littelfuse, Inc. © 2020 20