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TD & Chip Resettable

TD and chip resettable PPTC fuses
TD and chip resettable PPTC fuses provide short circuit and overcurrent protection in small automotive motors such as those for power windows and seat adjusters. "TD" stands for "terminal device." This indicates the polymer positive temperature coefficient devices install as close to motor windings as possible. That placement ensures the resettable automotive fuses trip quickly when overcurrent events or short circuits threaten to cause thermal damage. Since electric motors inside vehicles take all shapes and sizes, Littelfuse works with manufacturers to custom design TD and chip resettable fuses for each application.
  • Fast-acting
  • Available with voltage ratings from 16 V dc to 60 V dc
  • Available with resistance ratings of 10 mΩ to 100 mΩ
  • Sized and configured to fit inside motor housings
  • Custom designed for each application
  • Designed to produce minimal electromagnetic interference
  • Shock- and vibration-resistant
  • Lack of moving parts eliminates risk for arcing

TD & Chip Resettable Information Center

The TD (Terminal Devices) and Chip PolySwitch® devices are designed for use in small and medium automotive motor applications, like power windows, door lock motors, and lumbar pump motors. These devices help eliminate problems caused by abnormal function or misuse, such as a motor stall or short circuit. The TD and Chip devices are normally custom made to fit into the motor housing. By mounting them close to the motor windings, they will trip more quickly when the motor windings are hot and therefore closer to being damaged, and more slowly when the motor windings are cold.

Features

  • Solid state, no moving parts, no on-off cycling under fault conditions
  • Shock and vibration resistant
  • Custom designs enable flexibility in form factor and performance
  • Available in voltage ratings from 16 V dc to 30 V dc (high voltage capability up to 60 VDC in some form factors)
  • Available in a resistance range of 10 to 100 mΩ

Benefits

  • Resettability helps reduce warranty costs
  • Scalable technology allows for greater design flexibility
  • Smaller motor temperature increase compared to circuit breakers in stall condition
  • Reduced electromagnetic interference
  • Eliminate arcing due to moving contacts

Applications

  • Window lift motors
  • Door lock actuators
  • Trunk actuators
  • Fuel door actuators
  • Lumbar support motors
  • Seat motors
  • Sunroof motors
  • Convertible top actuators
  • Wire protection