Schurter Three-Terminal Fuses (STTP) for Battery Systems
Intelligent Fuse Solutions for Battery Systems
The Schurter three-terminal fuses STTP 9550 combine conventional overcurrent protection with an actively triggered overcharge protection function, providing an additional layer of safety for lithium-ion battery systems.
In addition to current-dependent interruption, the integrated trigger terminal enables controlled activation in critical operating conditions. This allows reliable disconnection of charge and discharge paths even in the event of protection IC or FET failure.
Gold-plated terminals ensure low and stable contact resistance, high signal integrity, and
excellent corrosion resistance. The compact package supports high-power-density battery pack
designs ranging from 1 to 24 cells.
Applications:
Typical applications include energy storage systems, power tools, UPS equipment, e-bikes, e
scooters, and automated guided vehicles (AGVs). Supported by UL approvals and designed for
redundant protection architectures required by modern battery safety standards, three-terminal
fuses provide a robust and intelligent protection solution for advanced energy systems.
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PPTC: Compact Protection for Maximum Reliability
The new PPTC series PFTA, PFTB, PFTC and PFTL provide reliable resettable overcurrent
protection for modern electronic applications. In the event of a fault, the polymer PTC device
automatically increases resistance to effectively protect systems against overloads and short
circuits — without replacing fuses.
The portfolio includes radial leaded and SMD versions with current ratings from 0.05 to 5 A and
voltage ratings up to 72 V. UL-compliant flame-retardant materials and compatibility with
automated assembly processes make these series ideal for industrial high-volume applications.
Applications:
Typical applications include energy storage systems, power supplies, industrial electronics,
consumer electronics, automotive systems, wearables, SSDs and Li-ion batteries. The compact
PFTL SMD series additionally enables space-saving designs with high integration density.
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UHS Fuse 50-100A, 32/50VDC, 8.4 x 9.4mm
The Schurter UHS is a compact, fast-acting SMT/PCB fuse designed for Separated Extra Low Voltage (SELV) applications where high breaking capacity and fast tripping are required.
Description:
This fuse was specially developed for SELV applications with
high rated currents for highest breaking capacity demands.
Thanks to its design, the fuses tripping time minimizes excessive
temperature dissipation at 2x rated current.
Features:
Applications:
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Bulgin’s extensive range of fuse holders are designed to give the high degree of protection demanded in today’s sophisticated electronic equipment. Carrying world-wide safety approvals from UL, VDE, CSA and IMQ, all types are manufactured from high grade flame retardant nylon and polyester materials.
Available in a variety of mounting options including panel mount, PCB & base mount, these compact and shock safe fuse holders are ideal solutions for 5 x 20mm, 6.3 x 25mm and 6.3 x 32mm fuses.
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EKO: High-Performance HV Fuses for Industrial and Energy Applications
The EKO series is engineered for demanding high-voltage environments, offering protection up to 1000 VDC (and 1250 VAC for selected models) and current ratings from 50 to 1100 A. With a breaking capacity of up to 50 kA DC, these square-body fuses deliver safety and reliability.
Designed for robust performance, the EKO series withstands mechanical vibration, shock, chemical exposure, and extreme temperatures from -40 °C to +125 °C. Its ceramic housing and tin-plated copper alloy terminals ensure durability and stable electrical characteristics even under harsh conditions.
Choose from Flush End, DIN-Rail, US Style Bolted Tag or Bolt-on to simplify integration into diverse systems. Optional indicators and microswitches enable easy status monitoring.
The EKO series meets IEC, UL, and GB/T standards and complies with CE, RoHS, and REACH directives, ensuring global acceptance and peace of mind.
Schurter EKO fuses combine high performance with proven safety—your trusted choice for modern high-voltage protection.
Variations
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Discover the Innovative Surface-Mount Fuse USE 2410 from Schurter
Small Footprint Wire-In-Air Fuse
Discover the innovative Surface-Mount Fuse USE 2410 from Schurter – a reliable solution for modern electronics. This Quick-Acting F fuse in the 2410 footprint is designed for 125-250 VAC and 86-125 VDC. Lead-free, without internal solder joints and AEC-Q200 tested, it is sealed against potting compounds. With a temperature range from -55°C to 125°C, it is suitable for demanding conditions.
The USE 2410 offers precision and robustness through innovative melting wire technology. It has a breaking capacity up to 200 A and precise tripping. The compact form factor saves space, while UL 94V-0 materials – fiber-reinforced plastic and gold-plated copper terminals – ensure longevity. Certified to UL, VDE, RoHS and REACH, it meets the highest standards.
Ideal for battery-operated systems, LED drivers, ballasts, medical and industrial equipment, power supplies, and white goods. In automotive (IATF 16949) or aerospace, it protects against overload and short circuit. Rated currents from 0.6 to 10 A with low voltage drops ensure efficiency.
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Schurter ARO - Compact. Robust. Reliable.
ARO: Inline Fuse for High-Voltage Applications
Safety and reliability are the key for high voltage applications. The new ARO fuses from Schurter provide robust protection for HV applications. Designed as an inline fuse, ARO integrates seamlessly into charging cables and connectors. It also meeting the latest international safety standards.
Ideal for EV charging cables and plugs, vehicle accessory lighting, general wiring protection, power generation and transmission, and telecommunications.
Economic design and flexible customization make ARO the perfect choice for high-performance applications like EV charging systems. Available in standard versions or tailored to customer specifications.
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APO: Active Safety for High Voltage Systems
Electrification is advancing across all industries – from electric vehicles and charging infrastructure to energy storage, aerospace, and fuel cells. As a result, the demand for reliable protection mechanisms in high-voltage systems is increasing. With the new Pyrofuse-APO Series, Schurter launches a fuse technology that sets a new benchmark for safety.
Unlike conventional fuses, the APO Fuse operates actively. In the event of a short circuit or accident, the control unit sends a trigger signal to an integrated micro gas generator. Within milliseconds, the generator produces high pressure that drives a piston to mechanically sever the solid copper busbar. The resulting arc is safely suppressed in a dedicated extinguishing chamber. The outcome is a complete galvanic isolation in less than two milliseconds – with measured values as fast as 0.9 ms.
The APO Series is rated for operating voltages up to 1000 volts and continuous currents up to 400 amperes. With an ultra-low internal resistance in the range of only a few dozen micro-ohms, power losses and temperature rise remain minimal. Its high breaking capacity ensures safe interruption even under extreme short-circuit conditions, while the fully encapsulated design prevents the release of gases or particles.
This unique combination of speed, robustness, and efficiency guarantees maximum system safety. At the same time, the compact design allows for seamless integration into existing architectures and relieves downstream components such as contactors.
With the Pyrofuse-APO Series, Schurter strengthens its position as a technology partner for emobility and the energy transition. Whether in electric vehicles, aerospace applications, or stationary storage systems, the APO Fuse ensures that high-voltage systems remain reliably protected – even under the most demanding conditions.
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ALO – High Performance Fuse for EV Applications
The new Schurter ALO series has been specially developed for high-voltage electric vehicle applications and covers voltages up to 1000 VDC and currents up to 900 amps. With a high breaking capacity of up to 50 kA and the option of axial or bottom bolt-on mounting – available in either ceramic or resin housings – it offers maximum design flexibility.
The product line is available in a variety of voltage ratings from 250 to 1000 VDC and covers current ranges from 100 to 900 A. It is designed for an operating temperature range of -40 to +125 °C. The housing materials are ceramic or resin, and the end caps are made of a tin-coated copper alloy.
Wide Range
A key advantage of the series is its wide range of products, which covers different designs, voltages, currents, and mounting methods, significantly reducing design effort for customers. Its robust construction ensures reliability in harsh environments and minimizes the risk of housing cracks, terminal detachment, or resistance fluctuations. Safety is enhanced by proprietary filling and curing technology that prevents explosions, reduces fire hazards, and protects adjacent components from splinters.
Application Areas
Typical applications for the ALO series include PDUs, battery disconnect units, manual service disconnectors, all-in-one controllers, 2-in-1 electric drives, and battery management systems. The ALO series complies with the JASO D622, ISO 8820-8, GB/T 31465.6, and UL 248-20 standards, with the ALO11, ALO12, and ALO14 models already UL-certified.
This makes it a reliable choice for high-voltage protection in modern electric vehicle systems:
powerful, safe, and customizable.
Applications
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FPR – High-Performance 5x20 Fuse Holder for Vertical PCB Mounting
Modern electronic designs require ever higher power density with reduced space requirements – without compromising on safety and reliability. The FPR fuse holder was developed precisely to meet these requirements. It offers an impressive 30% higher power consumption with the same footprint as the well-established FPG4 series. This means more thermal load capacity without taking up additional space on the PCB.
With a power consumption of 3.2 watts at 10 amps at 23 °C ambient temperature, the FPR significantly outperforms the previous generation. The housing dimensions remain compact at 12.5 mm, which enables simple 1:1 integration into existing designs. At the same time, the component meets all relevant standards with regard to vibration resistance in accordance with IEC 60068-2-6 and operates reliably in a temperature range of -40 °C to +85 °C. The IP40 degree of protection rounds off the technical profile.
Compatible with FPG4 Series
The FPR provides developers with a powerful, space-saving and easy-to-install solution that impresses with its high thermal load capacity – all without changing the existing layout. The new fuse holder is 100% compatible with the existing FPG4.
Application Areas
The FPR is particularly suitable for applications with high current loads and limited space – for example in industrial automation, mechanical engineering or building automation.
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© E. Preston (Electrical) Ltd 2026.
UK distributor of electrical and electronic components.
