Littelfuse LST Series SPD Thermally Protected Varistor

The LST Varistor Series is constructed with Littelfuse’s renowned thermally protected varistor technology (TMOV). The built-in thermal disconnecting function and electric arc shield provides additional protection to prevent catastrophic failure and fire hazard even under the extreme circumstances of varistor end-of-life or abnormal overvoltage conditions. It is specifically designed for Type 1 and Type 2 Surge Protective Devices (SPDs).

FEATURES

• 200kA SCCR, 20kA In, UL1449 Type 4 recognized component assembly.
• Same footprint and PCB layout for Imax 50kA and 75kA options. 
• Mechanically triggered AC and DC rated micro-switch with Normally Open or Normally Closed options for remote indication/monitoring circuit.
• Visual tab option to display LST working status. 
• RoHS compliant, Lead-free, and Halogen-free.

BENEFITS

• Facilitate meeting UL1449 listed Type 1 or Type 2 standards.
• Same PCB layout/design for 50kA and 75kA Imax rated SPDs.
• More flexibilities/options for designing an isolated remote indication/monitoring circuit. 
• Clear indication for technician/engineer to replace EOL product to continue surge protection for the end product. 
• Environment-friendly.

Littelfuse LST Series SPD Thermally Protected Varistor

Littelfuse Technical Datasheets

Littelfuse PSX Series High-Speed Fuses

The new Littelfuse PSX series fuses are extremely fast-acting, offering high-speed performance up to 1500VDC, and ranging from 80-1400A.

FEATURES 

• Available with multiple mounting terminations including flush-end style, DIN-style and bolted-blade style.
• Low watts loss minimizes wasted power from components.
• High interrupting rating provides improved protection levels.
• Visual blown fuse indication is detectable in the event of a fault.

Littelfuse PSX Series High-Speed Fuses

Littelfuse Technical Datasheets

Littlefuse Bluetooth Relays

Unlike anything on the market today, the MP8000 Bluetooth® Overload Relay features advanced monitoring and control capabilities. Our team of experts have put together a handy FAQ for this revolutionary relay to help address specific questions you might have.

Littelfuse Bluetooth Relays FAQ Press Release

Littlefuse Technical Datasheets

Littelfuse HMOV Varistors

The HMOV™ Varistor Series from Littelfuse can operate at ambient temperatures up to 125°C with 2500V isolation voltage, an advance made possible through the use of a new silicone coating technology. Competitive epoxy-coated varistor designs are typically limited to maximum temperatures of just 85°C while similar phenolic coating designs have limited isolation voltages. This high operating temperature makes it possible to reduce end-product production costs by eliminating the need for an additional heat sink or potting process. The combination of high operating temperature, high surge current absorption of up to 10kA (8/20µs), reliability confirmed by a 1000-cycle thermal shock test, and high (2500V) isolation voltage make it the highest performance radial-leaded varistor currently on the market.

Applications include industrial automation controls, solar power inverters, security systems, fire alarm and smoke detectors, smart meters, LED lighting base transceiver station (BTS) power supplies, and harsh environment/outdoor power supplies.

FEATURES

• High operating temperature of 125°C
• High isolation voltage of 2500V
• Thermal shock tested from -55°C to +125°C, 1000 cycles
• Meets UL 1449 and IEC 60950-1
• Eliminates the need for an additional heat sink or potting process used to dissipate heat
• Ideally suited for use in higher ambient temperature applications
• Eliminates the need for the additional insulation material
• Minimize PCB size by reducing space required between the varistor and other components
• Offers enhanced reliability that can extend the lifetime of the end product
• Enables end product worldwide compliance

Littelfuse HMOV Varistors

Littelfuse Technical Datasheets

Littelfuse Series 507 Compact 650VDC Cartridge Fuses

The new 507 Series Cartridge Fuse from Littelfuse is ideal for over-current protection in high-voltage DC power circuits. Its small footprint simplifies creating compact designs for power conversion equipment that demands higher operating efficiencies. It is available in both standard cartridge and axial-leaded designs, is RoHS compliant and 100% lead free.

Typical applications for the 507 Series include over-current protection for variable frequency drives (VFDs), photovoltaic (PV) inverters, DC-DC converters, high-voltage power supplies, etc.

FEATURES

• High DC voltage rating of 650V with interrupting rating of 150A@650VDC in a compact 6x32mm footprint
• 1A – 8A current rating
• Operating temperature from −55°C to +125°C
• Provides robust over-current protection for high-voltage DC power circuits; enables compact design for power conversion equipment demanding higher operating efficiencies
• Well suited for most commercially available 200V Class and 400V Class VFDs
• Provides reliable protection in extreme temperature environments

Littelfuse Series 507 Compact 650VDC Cartridge Fuses

Littelfuse Technical Datasheets

Littelfuse Shock-Block Ground-Fault Circuit Interrupter

The Littelfuse Industrial Shock-Block™ SB6100 is vital where people, equipment, and water are present. This product is the first and only ground-fault circuit interrupter (GFCI) to be listed UL943C Standard for People Protection. Additionally, it is the only GCFI device on the market that monitors the continuity of the ground circuit.

FEATURES

• Protects personnel from electrical shock where standard GFCI breakers and receptacles have never been available.
• Offers an all-in-one solution to detect leakage current and interrupt the power for loads up to 100A.
• Includes overcurrent protection provided by Littelfuse Class T fuses, eliminating the need to install separate contactor protection, saving cost and space while also allowing for a short-circuit current rating (SCCR) of 50kA.
• Is the only SPGFCI device currently on the market that monitors the continuity of the ground circuit.
• Prolongs the life of the internal contactor by offering undervoltage, brownout and chatter detection.
• Is available as a SPGFCI and equipment ground-fault protective device (EGFPD). The SPGFCI models have a 20-mA trip level and the EGFPD models can be set to trip at 6, 10-100 mA in increments of 10 mA. 
• All models include CSA C22.2 No. 144-M91 certification.

Littelfuse Shock-Block GFCI

Littelfuse Technical Datasheets

Littelfuse SMF3.3 TVS Diodes for Sensitive Electronics

Littelfuse, Inc., the global leader in circuit protection, has introduced a series of TVS Diodes designed specifically to protect sensitive portable and compact electronics from voltage transient events. The SMF3.3 Series TVS Diode combines 200W surge capability, low reverse standoff voltage (3.3V), and low clamping voltage (6.8V) with a small-footprint, low-profile SOD-123FL plastic package for a variety of portable and compact electronic products.

The SMF3.3 Series is ideal for low voltage applications such as the protection of V_CC busses and other vulnerable circuits used in portable devices, portable hard drives, notebooks, POS terminals, solid-state drives (SSDs), power supplies, and monitors.

“The SMF3.3 Series expands the range of circuit protection options available to circuit designers for low voltage applications by bringing together superior surge capability with low reverse standoff voltage and clamping voltage specifications,” said Jeff Chin, global product marketing director for semiconductor products at Littelfuse. “The compact, low-profile SOD-123FL package is ideally suited for portable devices and consumer applications.”


FEATURES

• Ideal for protecting sensitive devices against transient over-voltages due to the combination of low clamping voltage of 6.8V, low reverse standoff voltage of 3.3V, and 200W surge capability.
• The small and flat lead low-profile (1.08mm) SOD-123FL plastic package optimizes the use of circuit board space, making it a good choice for portable devices and consumer applications.
• Promotes high ESD immunity and superior circuit protection, permitting manufacturers to achieve ESD protection beyond the maximum level stated in the IEC standard and to protect against a multitude of other threats to ensure product reliability in the field.

Littelfuse SMF3.3 TVS Diodes

Littelfuse Technical Datasheets

Littelfuse IGBT Power Module

Littelfuse introduces the MG12600WB-BR2MM Series, the latest addition to their IGBT Module Power Semiconductor portfolio. The new 1200V, 600A Half-Bridge IGBT Module Series offers designers a substantially higher current rating than the portfolio’s previous maximum current rating (450A), offering the high efficiency and fast switching speeds of modern IGBT technology in a robust and flexible format. The module’s compact (152 x 62 x 17 mm) package simplifies thermal management and allows for less complex, more elegant system designs. This multi-chip module reduces solder joint and PC board space requirements. The WB configuration package is available in various current ratings for the release of products across a wide power range.

Applications for the MG12600WB-BR2MM Series include power control applications, such as flexible and efficient industrial and servo drives, solar inverters, high power converters, UPSs, and welding equipment.

“This 1200V, 600A module extends the current range in our industry-standard module package so customers may use the same thermal and PC board design to release multiple power ratings within their platforms,” said Dr. Kevin Speer, global manager of technology strategy, Power Semiconductors, at Littelfuse. “The semiconductor technology allows high conversion efficiencies, while the multi-chip module enables elegant system design with fewer failure points for greater reliability.”


FEATURES

• Trench-gate field stop IGBT technology ensures state-of-the-art IGBTs with optimal conduction and switching performance
• Low saturation voltage and positive temperature coefficient means that MG12600WB-BR2MM modules can be easily paralleled to increase system current
• Fast switching and short tail current allows for higher system efficiency through reduced switching losses

Littelfuse IGBT Power Module

Littelfuse Technical Datasheets

Littelfuse SIDACtor Protection Thyristors

A new series of SIDACtor® Protection Thyristors in surface-mount DO-214AB packages from Littelfuse are designed to protect low-data-rate interfaces and outdoor data interfaces in general industrial applications.

The Pxxx0S3NLRP Series provides robust surge protection performance at up to 2.5kA, while maintaining much lower switching threshold (V_S) and on-state voltage (V_T) than traditional protection solutions like Gas Discharge Tube (GDT) technology. They also offer crowbarring power fault protection superior to the typical clamping device. Applications include protection for general industrial outdoor data interfaces, such as short loop interfaces (<10m) located at base station sites, and low-data-rate interfaces such as RS-232 or RS-423.

FEATURES

• Robust surge protection performance at up to 2.5kA while maintaining low switching threshold (V_S) and on-state voltage (V_T)
• Component properties do not degrade after multiple surge events within its rated limits
• Certified, environmentally friendly and suitable for worldwide usage
• Offers crowbarring power fault protection superior to that of the typical clamping device
• High surge protection and high-performance design extend equipment lifetime
• Helps line drivers comply with global standards

Littelfuse SIDACtor Protection Thyristors

Littelfuse Technical Datasheets

Littelfuse 470 / 476 Series Subminiature SMT Fuses

New 470 and 476 Series NANO2® Subminiature Fuses from Littelfuse withstand surge and provide circuit protection against overload conditions for downstream components. Both feature highly compact surface mountable packages for high design flexibility in space-constrained applications; the SMT design supports higher placement speed and higher yields during product manufacturing. With a 1206 footprint, the 470 Series Fuse is the smallest 125VAC-rated surface-mountable fuse available in the Littelfuse portfolio; The 476 Series is a family of 250VAC-rated surface mountable fuses in a compact 2410 footprint. It is the smallest SMT fuse with this high voltage rating and, like the 470 Series, is designed for primary side circuit protection in compact devices with high voltage requirements.

Typical applications include LED lighting, LCD/LED TVs, white goods (major household appliances), notebooks/PCs, and power supply units.


FEATURES

• Surface Mount Type AC Fuse
• Smallest footprint: 470 Series – 1206 package, 476 Series – 2410 package
• High operating temperature at 125°C
• Surge Immunity Capability: 470 Series – US: ENERGY STAR® (1.5A and above ampere rating only), 476 Series – Global: IEC 61000-4-5 2 ed. (3A and above ampere rating only)
• SMT is the trend in compact applications with space constraints; it also enables higher speed and yield in manufacturing processes
• Occupies less board space
• Suitable for high temperature applications such as LED lighting
• 470 and 476 Series Fuses withstand surge from AC power line and keep light bulb/tube working continuously

Littelfuse 470 / 476 Series Subminiature SMT Fuses

Littelfuse Technical Datasheets

Littelfuse 777 Series Axial Lead Fuses

Littelfuse, Inc., the global leader in circuit protection, has introduced the compact 777 Series Fuse to provide protection for higher-wattage wall-mount chargers for battery-powered electronic equipment. Although chargers for earlier generations of mobile phones had relatively low wattage (typically about 5W), today’s highly compact chargers must often be able to handle 10-15W of power, which requires withstanding higher levels of current. The axial lead, 3.6mm x 9mm 777 Series Fuse incorporates an innovative type of filler material that provides a finely tuned balance between the surge tolerance necessary to prevent nuisance fuse tripping with the fuse’s ability to open safely when a short-circuit occurs. The 777 Series’ robust design lets it withstand up to 24 hits of 7.5kV ringwave surge; it will open safely on a direct short condition without producing soot, sparks, and sounds. Typical applications include wall-mount smartphone and tablet chargers and 10‑20W power supply modules for other battery-powered consumer electronics.

“From the consumer perspective, everybody wants their mobile electronic devices to recharge quickly, so they can get back to using them in the way they were intended. The 777 Series Fuse allows circuit designers to engineer fast, compact, and economical chargers that don’t compromise user safety,” said Daniel Wang, product manager for the 777 Series Fuse line. “Circuit designers can count on Littelfuse for robust fuse design and superior manufacturing quality.”

FEATURES

• Its high interrupting rating design ensures the fuse will open safely under short-circuit conditions without producing soot, sparks, or popping noises.
• The high surge withstand capability prevents nuisance tripping of the fuse caused by transient surges.
• The fuse’s 3.6mm x 9mm footprint conserves board space, which makes it suitable for use in compact wall-mount charger designs.
• Its epoxy coating provides insulation on the vertically mounted fuse body.

Littelfuse 777 Series Axial Lead Fuses

Littelfuse Technical Datasheets

Littelfuse SB6100 Industrial Shock-Block GFCI

The Industrial Shock-Block (ISB) from Littelfuse is a personnel protection device designed to meet the new requirements for special-purpose ground-fault circuit interrupters (GFCIs) defined by UL 943C.  ISB is the first and only permanently connected Class C and Class D GFCI on the market.  Class C GFCIs are introduced to be used on systems where the line-to-line voltage is 480V or less with a trip level of 20mA, while Class D GFCI is intended to be used on 600V systems.  These improvements to the standard Class A GFCI (6mA trip level used on 240V or less systems) were made to allow the use of GFCIs in industrial facilities.

ISB is also available with adjustable protection settings as an equipment ground-fault protective device (EGFPD).  The EGFPD models can be set to trip at 6, 10, 20 or 30mA.  This offers more flexibility, since GFCI devices are not allowed to have an adjustable trip level.

ISB (GFCI & EGFPD) is available for voltages from 208 to 600V, with a maximum full load current of 100A, and a built-in over current protection supplied by Littelfuse Class T fuses.  The load can be single-phase (line-to-line) or 3-phase, however, it cannot have a neutral.  The power system can either be solidly-grounded or high-resistance grounded.

Two options for enclosures are available: UL-recognized open-chassis models are available for installation in existing electrical enclosures and UL-listed enclosed models include a NEMA 4X enclosure for stand-alone installations.

The ISB also monitors the ground wire (load-ground) connection between the ISB and load.  This is a required feature for GFCI devices and is optional for EGFPD devices.  If the connection is broken, the ISB will provide an alarm by changing the state of the alarm contacts.  This monitoring circuit includes an extra wire (pilot wire) between the ISB and load (since the monitoring current is low, only a small wire is required).  At the load, the pilot wire is connected to a termination device.  The other end of the termination devices is connected to the load ground (typically the enclosure).


Littelfuse SB6100 Industrial Shock-Block GFCI

Littelfuse Technical Datasheets

Littelfuse Up-LINK Remote Indicating Fuseholder

The Littelfuse Up-LINK® solid state, dead-front fuseholder provides remote fuse status indication without the need to incorporate proprietary network protocols. It features two separate indication modes: 

• Remote indication for immediate notification to maintenance personnel
• Local LED indication simplifies locating the open fuse once the panel door is open 

Advanced notification is beneficial in limiting expensive downtime, reducing production scrap or minimizing unsafe conditions to personnel. Up-LINK provides remote fuse status communication that can easily integrate with an existing PLC or system. If used in conjunction with a user-programmed PLC, additional information can be communicated such as fuse type, fuse part number, necessary Personnel Protective Equipment (PPE) and where replacement fuses are located. In this way, remote monitoring throughout the manufacturing environment improves uptime of critical loads via immediate detection and notification of problems. 

Because there is no need to connect an external power supply or replace batteries throughout the life of the holder, the output signal is reliable and instills end-user confidence in its accuracy. 

It has also been designed to the same footprint dimensions as Littelfuse’s Class CC and Midget fuse dead-front holders, making design upgrades easy in existing applications and layouts. 

What does Up-LINK Offer? 

• Increased Productivity 
• Enhanced Reliability 
• Improved Safety 

Product Features 

• Cost-effective solution for remote fuse status indication and local LED indication 
• Easy integration into existing PLC or system 
• Non-proprietary 
• Current-limiting Class CC fuses provide superior protection with high interrupting rating 
• Meets stringent IEC and UL Touch Safe Standards to improve worker safety 
• Time-saving DIN Rail mounting 

Littelfuse Up-LINK Fuseholder

Littelfuse Technical Datasheets