Battery Protection Fuses • 1500 V Dc • Class aBat • 125 - 630 A <*NLus C€ lBnHSl REACH HF The Littelfuse Energy Storage Rack (ESR) series of fuses is designed specifically to protect battery racks in energy storage systems, inverters, and many other dc applications. The 1500 V dc high-speed square body fuse is extremely fast-acting to respond quickly to a range of fault currents to safeguard the battery module or other devices. This Class aBat partial range fuse has superior short circuit protection and a low minimum breaking capacity (MBC)—from 300 % or 3 times the fuse's rated current to 250 kA—to cover a range of over currents that traditional high-speed partial range fuses do not protect against. The ESR fuse safely interrupts most faults in a battery storage system to avoid catastrophic failures and costly shutdowns. The ESR fuse also offers a visual blown-fuse internal indicator version. This product has an optional microswitch accessory to provide external indication. FEATURES BENEFITS Provides superior short-circuit protection and the ability to scale-up High dc interrupting rating systems without the need to redesign the existing circuit protection, saving time and costs Low minimum breaking current Extremely fast acting Conforms to the IEC 60269-7 battery standard Offers easy coordination with battery modules and reduces size and rating of dc contactors to save space and costs Delivers high-speed performance Maximizes efficiency by preventing energy loss and minimizing the wasted power of components Specifically design to safeguard evolving battery technologies with fuse circuit protection Compact NH 1XL and 3XL size Saves space and offers design flexibility Optional blown-fuse indicator and external microswitch Indication features reduce downtime and increase safety Applications • Battery energy storage systems (BESSs) - Battery Protection Unit (BPU) and battery racks • Power conversion systems • Hybrid PV-BESS inverters Expertise Applied | Answers Delivered 1 of 9 Specifications are subject to change without notice.

Voltage Rating Amperage Rating Interrupting Rating Time Constant Mounting Material Applicable Standards Environmental Operating Temperature Storage Temperature Country of Origin Bolted-blade style, DIN-blade style Body: ceramic Contacts: plated copper (bladed) RoHS Compliant, REACH, Halogen Free (for non-indicator versions only) -55 °C to +125 °C (-67 °F to +257 °F) Up to +35 °C (+95 °F) with relative humidity <65 % Expertise Applied | Answers Delivered 2 of 9 Specifications are subject to change without notice.

Expertise Applied | Answers Delivered 3 of 9 Specifications are subject to change without notice.

ESR Series High-Speed CSquare Body CE E REVISION REVISION DESCRIPTION DESCRIPTION DRAWING DRAWING CREATED CREATED FORFOR DATASHEET DATASHEET GRAPHICS GRAPHICS -R INTERNAL INTERNAL INDICATOR INDICATOR (indicator (indicator version version only) only) CRITICAL CRITICAL CHARACTERISTIC CHARACTERISTIC FORFOR PART PART SAFETY/COMPLIAN SAFETY/COMPLI DENOTES DENOTES CRITICAL CRITICAL CHARACTERISTICS. CHARACTERISTICS. DENOTES DENOTES CPKCPK DIMENSIONS, DIMENSIONS, -MINIMUM -MINIMUM CPKCPK VALUE VALUE DENOTES DENOTES A CHARACTERISTIC A CHARACTERISTIC THAT THAT PROVIDES PROVIDES AN INDICA AN IND OF PROCESS...

ESR Series High-Speed Square Body Time Current Curve (1XL Case Size) VIRTUAL MELTING (PRE-ARCING) TIME IN SECONDS DC R.M.S CURRENT IN AMPERE TEST VOLTAGE: TIME CONSTANT/POWER FACTOR: FUSE CATALOG NUMBER: TIME CURRENT CHARACTERISTIC CURVES - THIS DATA IS GENERATED IN EXCEL - DRAWN BY: LLL DATE: 02/26/2024 REVISION: A DRAWING NO.: Littelfuse.com/ESR ©2024 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/20/2024

ESR Series High-Speed Square Body Time Current Curve (1XL Case Size) VIRTUAL MELTING (PRE-ARCING) TIME IN SECONDS DC R.M.S CURRENT IN AMPERE TEST VOLTAGE: TIME CONSTANT/POWER FACTOR: FUSE CATALOG NUMBER: TIME CURRENT CHARACTERISTIC CURVES - THIS DATA IS GENERATED IN EXCEL - DRAWN BY: LLL 02/26/2024 DATE: REVISION: A DRAWING NO.: Littelfuse.com/ESR ©2024 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/20/2024

ESR Series High-Speed Square Body Time Current Curve (3XL Case Size) VIRTUAL MELTING (PRE-ARCING) TIME IN SECONDS DC R.M.S CURRENT IN AMPERE TEST VOLTAGE: TIME CONSTANT/POWER FACTOR: FUSE CATALOG NUMBER: TIME CURRENT CHARACTERISTIC CURVES 7 of 9 - THIS DATA IS GENERATED IN EXCEL - DRAWN BY: LLL DATE: 02/26/2024 REVISION: A DRAWING NO.: Specifications are subject to change without notice. FCC01-ESR3XL

ESR Series High-Speed Square Body Total Clearing l2T Correction Factor Curve (1XL and 3XL) 1500 TOTAL CLEARING I2t CORRECTION FACTOR OPERATING VOLTAGE IN VOLTS TEST VOLTAGE: 500V - 1500V TIME CONSTANT/POWER FACTOR: FUSE CATALOG NUMBER: LITTELFUSE, INC. Curve Temperature Derating CHICAGO, IL. USA DRAWN BY: LLL 03/31/2020 DATE: REVISION: A I2T VARIATION CURVES Ambient temperature: temperature of airFCC07-PSX immediately surrounding fuse DRAWING NO.: - THIS DATA IS GENERATED IN EXCEL - AMBIENT TEMPERATURE TEST VOLTAGE: TIME CONSTANT/POWER FACTOR: FUSE CATALOG NUMBER: TEMPERATURE RE-RATING CURVE...

ESR Series High-Speed Square Body Watts Loss Correction Factor Curve 100 WATTS LOSS CORRECTION FACTOR PERCENT OF RATED CURRENT(%) TEST VOLTAGE: TIME CONSTANT/POWER FACTOR: FUSE CATALOG NUMBER: DRAWN BY: LLL 01/26/2015 03/20/2017 DATE: A REVISION: DERATINGI2T CURVE CORRECTION - WATTS LOSS FACTOR CORRECTION - THIS DATA IS GENERATED IN EXCEL - Disclaimer Notice – Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and may...