HWA20 Series - 32V Hard-Wired Waterproof ATO® Fuse Box

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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

Thanks to electronically isolated input and output connections, the HWA20 Series 32V Hard-Wired Waterproof ATO® Fuse Box allows you to achieve customized circuit protection with up to 10 ATO® blade fuses (sold separately).

This compact, IP67-rated waterproof fuse holder is dust-tight and protected against temporary immersion in water, which means it can be installed nearly anywhere on a vehicle.

Plus, if you ever need to expand a vehicle's circuit protection capacity, the HWA20 Series modular fuse block can be connected to additional units or compatible power distribution modules and fuse holders, including FLEC, HWB60, HWB18, MEGA® Flex, and MIDI® Flex models.

Features and Benefits

  • Compact, 20-cavity hard-wired fuse box fits 10 ATO® blade fuses (sold separately)
  • Handles 40A continuous current per circuit and 210 maximum continuous current overall
  • Sealed, IP67-rated, waterproof fuse holder can be installed virtually anywhere on a vehicle and stands up to road splash and salt spray
  • Dovetail slots on the sides make it a modular fuse box that can be connected to other fuse holders to easily expand circuit protection capacity
  • Wires plug into the back of the unit using industry-standard Tyco sealed power terminals, making the fuse box easy to connect
  • Terminal position assurance (TPA) locks help prevent disconnection of wires due to vibration and accidental snagging


  • Overflow Circuits from a Main Power Distribution Module
  • Main Power Distribution Module on Small Vehicles
  • Accessory Circuits

Access specifications, certifications, check availability and order parts below

Catalog #Fuse TypeCurrent Rating (Continuous per Circuit) in AmpsCurrent Rating (Continuous) in AmpsIngress ProtectionNumber of CavitiesDimensionsTemperature Maximum CelsiusTemperature Minimum CelsiusMounting MethodHousingSamplesCompare
PDM61001ZXMATO40A210IP6720161 mm85-40Bolt DownUL94-V0Order
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
PDM61001ZXM HWA20 ATO sealed fuseholder RoHS No 02/22/2018 PbFree No 02/22/2018 CoC_RoHS10_PDM61001ZXM REACH209_Declaration_PDM61001ZXM Yes
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