HVAC/R CAPABILITIES BROCHURE

Fuses & Fuse Holders • Protection Relays • Electronic Controls

Littelfuse.com/HVAC

Preferred Choice for Protection and Control by the Leading HVAC/R BrandsLeading HVAC/R manufacturers rely on Littelfuse to protect and control the critical components of their systems assuring product reliability and cost optimization. The Littelfuse line of HVAC/R protection and control products go beyond safeguarding system components to covering the equipment as a whole from overload and overcurrent.

For decades, we have helped

OEMs, electrical installers, design

engineers, and end-users select the

right product for their applications

ApplicationsHighSpeed Fuses

UL Class Fuses

Midget & Class CC Fuses

Fuse Blocks & Holders

Power Distribution Blocks

Enhanced Overload Relays

Voltage Monitors

Time Delay Relays

Load/Current Sensors

Air Handling Units • • • • • • • •

Rooftop Systems • • • • • • • •

Screw/Scroll Compressors • • • • • • • • •

Chillers • • • • • • • • •

Furnace Manufacturers • • • • • • •

Heat Pumps • • • • • • •

Walk-In Fridge/Freezers • • • • • • • •

Refrigeration Racks • • • • • • •

Fixed Speed Compressors • • • • • • • •

AC Condensing Units • • • • • •

Split Systems • • • • • •

Boilers • • • • •

A Strong Product Portfolio for Your New Design

Littelfuse Unique HVAC/R Product Mix

UL Class FusesYour equipment is in good hands with the #1 brand in circuit protection. Littelfuse UL Class fuses offer quality overcurrent protection for all kinds of HVAC load conditions. Littelfuse fuses are chosen over breakers due to their higher amperage in a smaller package, quicker response time, easy coordination, and no calibration required.

Available in both indicating and non-indicating versions Best in class current-limiting performance available in Class RK5 High Interrupting Rating (up-to 300kA) POWR-PRO® Performance, Dual-element design

High-Speed FusesThe QS Series is designed with high-performance silver fuse elements that combine with a hardened silica filler to provide enhanced system protection.

Reduced peak let-through current Low watt loss saves energy wasted during operation Laser-etched resistance values to eliminate labels that erode over time Universal mounting adapts to wide variety of configurations

Class CC & Midget FusesHVAC Control circuits are generally protected using Class CC & Midget fuses.Littelfuse UL Listed Class CC offers extreme current-limitation in space saving design and are available up-to 60A. Midget Style (10X38 Size) fuses offers supplementary protection in a wide range of ampere ratings to match specific requirements in a variety of applications.

Saves space 45-75% Fast acting & time delay performance High-interrupting rating Extreme current-limiting

Fuse Blocks & HoldersEnable easy fuse installation and replacement with fuse blocks, fuse holders and fuse accessories.

Compact design provides space savings Universal and DIN-rail mounting with optional DIN-Clip covers Indication available Snap to release, no tools required

Power Distribution BlocksSpecially designed covers provide protection against accidental shorting between poles caused by loose wires, tools, or other conductive material. They also protect personnel from accidentally contacting energized connectors.

Meets UL standards Space saving designs Integrated touch-safe cover to increase safety Mounts to DIN rail or panels

Littelfuse.com/HVAC

Littelfuse Unique HVAC/R Product Mix

Enhanced Overload RelaysThis Enhanced Overload relay combines voltage/phase protection in addition to under/overload protection for motors. Protects motors from conditions resulting in motor windings overheating and burning insulation causing motor failure. Optional communications allow connection to remote monitoring.

Protects against phase loss and reverse phase Monitors over/under voltage and unbalanced voltage Underload protection keeps motors from running unloaded Real-time voltage/current readings and fault codes

Voltage/Phase MonitorsPrevent motors from running with no load applied and provide protection due to blown fuses, broken wires or worn contacts. The monitors help to prevent damaged machinery and injury of personnel.

Protects against phase loss and reverse phase Rapid cycling protection Unbalanced voltage protection Low & high voltage trip

Time Delay RelaysProtect HVAC/R equipment from damage caused by rapid cycling of compressors. The Littelfuse SSAC line of timers include delay-on-make, delay-on-break, dual function, multifunction, and lockout functions.

Prevents rapid recycling of compressor Provides brownout protection and prevents low voltage start ups Encapsulated to protect against shock, vibration and humidity Replaces thousands of competitive models

Load/Current SensorsLittelfuse load and current sensors are commonly used on both indoor and outdoor air handling units, rooftop systems, screw compressors, scroll compressors, self-contained A/C systems, heat pumps, and chillers.

Self-powered for use as AC current proof relay Available with fast-on terminals for quick installation Monitors up to 200A loads Over or under current sensing with adjustable trip delays

Ready-to-Install Fuse holderSaves Installation Time by Attaching the Leads to the Fuse holder A rooftop unit manufacturer utilized a pre-assembled 571 (standard) and 572 (snap-mount) panel-mount fuse holders, with a KLK 5A 600VAC fuse, 150°C #12-#18 wire and 150°C heat-shrink tubing.

GOING BEYOND SUPPLIER TO YOUR SOLUTION PARTNERWith a wide range of products, high volume manufacturing capabilities and service systems that work for volume solutions, Littelfuse can be your total product solution partner.

Custom ServicesSpecial projects welcome. In addition to the wealth of standard Littelfuse HVAC/R products offered, custom product enhancements and services are our expertise. Think of Littelfuse as your design partner – an extension of your team – to integrate a total product solution to meet your design goals.

Examples of Custom Solutions Driven By Customer Needs

Pre-Assembled Fuse holder with TerminalsSaves Installation Time by Pre-assembling the Fuse with Lead Terminals Attached A pre-assembled solution, incorporating a LHR 2-wire fuse holder and a LMF 3.2A 300VAC fuse with customer specified 1/4” female quick connectors improved installation time and quality for this manufacturer.

Customized LabelingSaves Labor and Optimizes Manufacturing with Custom Labeling A large OEM saves time with a customized label solution, incorporating unique codes and identifiers specific to the manufacturer.

Customized TimingSaves Cost of Potential Lost Inventory Due to Accidental Manual OverrideMultiple large OEM companies requested a customized 3-phase voltage monitor without a manual reset option for the manufacturer to protect what’s inside their refrigeration racks. This forced a time delayed restart by eliminating the possibility of the rack accidentally waiting on a manual reset.

Adaptive Fan ControlHelping to Maximize Energy EfficienciesLittelfuse provides a unique Delay-on-Break timer where the timing is based on how long the heating or A/C compressor runs. The timer monitors the system run time and determines how long the Delay on Break time delay should be. The longer the system runs, the longer the timing, the longer the fan runs. This custom solution maximizes the systems heating and cooling by pulling as much conditioned air out of the duct work as possible making the system more efficient and reducing energy costs.

Kaunas

Amsterdam

Muzquiz

Bellingham

Matamoros

Boston

EssenSaskatoon

Piedras Negras

SeoulTokyoTsukuba

SuzhouWuxi

Beijing

ShanghaiKunshan

TaipeiChu-pei

DongguanShenzhen

Hong Kong

Lipa City

Singapore

São Paulo

Legnago

BremenDeventer

LaufOzegna

Troy

Eagle Pass

Manaus

Lake MillsRapid CityChicago

ChampaignFreemont

Local Resources for a GLOBAL Market

Littelfuse World Headquarters8755 West Higgins Road, Suite 500Chicago, IL 60631, USATechnical Support:Tel: +1-800-TEC-FUSEE-mail: techline@littelfuse.comCustomer Service:Tel: +1-800-227-0029E-mail: PG_CSG@littelfuse.comFax: +1-847-787-5190

Littelfuse Startco3714 Kinnear PlaceSaskatoon, SK S7P 0A6CanadaTel: +1-306-373-5505Fax: +1-306-374-2245E-mail: techline@littelfuse.com

Littelfuse SymCom222 Disk DriveRapid City, SD 57701, USATechnical Support:Tel: +1-800-832-3873E-mail: techline@littelfuse.comCustomer Service:Tel: +1-800-227-0029E-mail: PG_CSG@littelfuse.comFax: + 1-605-348-5685

Littelfuse products are certified to many standards around the world. To check certifications on specific product please refer to the product datasheet on Littelfuse.com.

© 2018 Littelfuse, Inc. FORM PF157Rev: 1-B-022018

To view all Littelfuse product catalogs, visit our website at Littelfuse.com/Catalogs.

Go to Littelfuse.com/TechnicalResouces

Protection Relays & Controls Catalog The comprehensive line of electronic and microprocessor-based protection relays safeguard equipment and personnel to prevent expensive damage, downtime or injury due to electrical faults.

Visit Technical Resources at Littelfuse.com Technical information is only a click away. The Littelfuse Technical Resources contains datasheets, product manuals, white papers, application guides, demos, on-line design tools, and more.

Fuses and Fuse Holders Catalog Littelfuse offers a complete circuit protection portfolio of industrial power fuses, including time-saving indication products for an instant visual blown-fuse identification.

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 not be used in, all applications. Read complete Disclaimer Notice at www.littelfuse.com/product-disclaimer.