HE3321C12 - HE3300 Series

Series: HE3300
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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.

Miniature reed relay in a single-in-line (SIL) package with a choice of normally open, normally open high-voltage or changeover contacts capable of switching up to 300Vdc at 10W. Available with 5V, 12V and 24V coils and has external magnetic shield options. Ideally suited for security, telecom, instrumentation, process control, industrial and automatic test equipment (ATE) applications.


  • Miniature single-in-line (SIL) package
  • Available with standard 5V, 12V or 24V coil options
  • High-voltage switching version available
  • Normally open and change-over contact configurations available
  • External magnetic shield option available


  • Single-in-line configuration allows high packing densities, minimizing space and cost
  • Lower coil power consumption than electromechanical devices
  • Hermetically sealed switching contacts are immune to their environment
  • Transfer molded package gives maximum component protection


  • Security systems
  • Telecom equipment
  • Process control systems
  • Automatic test equipment
  • Instrumentation

HE3321C12 ECAD Models

curus cUR_NRNT8_E47258_100213137

UR UR_NRNT2_E47258_100213137

pdf icon PIR motion detector

pdf icon Sensing Products Selection Guide

This guide provides an introduction to magnetic sensing and options for value-added custom design packages.

pdf icon Handling of Reed Sensors Relays And Switches Application Note

When used within their capabilities Littelfuse reed sensors reed relays and reed switches provide many years of robust performance

pdf icon Measuring Reed Switch Sensitivity and Contact Resistance Application Note

The purpose of this application note is to document the preferred method of reading the sensitivity and contact resistance of Littelfuse reed switches.

pdf icon Capacitive Loads Application Note

When there is significant capacitance in a reed sensor reed relay or reed switch circuit the peak current and energy switched by the reed contacts should be considered.

pdf icon Inductive Load Arc Suppression Application Note

When a reed switch or reed sensor is used to control an inductive device (relay coil solenoid transformer small motor etc.)

pdf icon Reed Switch Extended Shock Capabilities Application Note

The maximum shock specifications in the Littelfuse catalog are very conservative for most switches smaller than the DRxxxx type. T

pdf icon Vibration Testing and Precautions Application Note

Littelfuse tests sinusoidal vibration according to Mil. Std. 202G Method 204D Test Condition G (10 � 2000 Hz frequency sweep at 30 G or 0.06 inch double amplitude whichever is less).

pdf icon Catalog Glossary Reed Switch Terms Application Note

Reed Switch Terms Glossary

Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s)
HE3321C1200 HE3321C1200 RELAY RoHS No 09/23/2021 PbFree No 09/23/2021 CoC_RoHS10_HE3321C1200_09-24-2021 REACH219_Declaration_HE3321C1200_09-24-2021 No
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