Name: HRDR Series - Recycling Timer
Brand: Littelfuse Inc.

HRDR Series - Recycling Timer

Series: HRDR

Questions? Contact Littelfuse Support

Disclaimer Notice

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.

The HRDR Series combines an electromechanical relay and microcontroller timing circuitry. It offers 12 to 230V operation in five ranges and factory fixed, onboard or externally adjustable time delays with a repeat accuracy of ±0.5%. The high switching capacity of the output contacts allow for direct control of heavy loads like compressors, pumps, motors, heaters and lighting. A bypass/reset switch option allows operator to interrupt normal recycling sequence and energize output relay. An excellent choice for OEM applications.

Operation (Recycling with Reset Switch)
Upon application of input voltage, the ON time T1 begins and output relay energizes. At the end of the ON time, the output relay de-energizes and the OFF time T2 begins. At the end of the OFF time, the output relay energizes and the cycle repeats as long as input voltage is applied. Some recycling timers have the OFF time as the first delay.
Reset: Removing input voltage resets output and time delays, and returns sequence to the first delay.

Access specifications, certifications, check availability and order parts below

Catalog #	Input Voltage (V)	Output Form	Storage Temperature (F/C)	Time Delay Range	Dimensions	Stock	Samples

HRDR121A4R	12 V dc	Non-isolated SPDT	-40° to 85°C (-40° to 185°F)	ON time first: 10 - 1000 s onboard adjustable; OFF: 1 - 100 m onboard adjustable	3 H x 2 W in. (76.7 x 51.3 mm)	Check	Order
HRDR321A4R	24 V dc	Non-isolated SPDT	-40° to 85°C (-40° to 185°F)	ON time first: 1 - 100 s onboard adjustable; OFF: 1 - 100 m onboard adjustable	3 H x 2 W in. (76.7 x 51.3 mm)	Check	Order
HRDR322B2R	24 V dc	Non-isolated SPDT	-40° to 85°C (-40° to 185°F)	ON: 10 - 1000 s onboard adjustable; OFF time first: 10 - 1000 s onboard adjustable	3 H x 2 W in. (76.7 x 51.3 mm)	Check	Order
HRDR330A0R	24 V dc	Non-isolated SPDT	-40° to 85°C (-40° to 185°F)	ON time first: 0.1 - 10 s externally adjustable; OFF: 0.1 - 10 s externally adjustable	3 H x 2 W in. (76.7 x 51.3 mm)	Check	Order
HRDR331A1	24 V dc	Non-isolated SPDT	-40° to 85°C (-40° to 185°F)	ON time first: 0.1 - 10 s externally adjustable; OFF: 1 - 100 s externally adjustable	3 H x 2 W in. (76.7 x 51.3 mm)	Check	Order
HRDR411SB30MR	120 V ac	Non-isolated SPDT	-40° to 85°C (-40° to 185°F)	ON: 1 s fixed; OFF time first: 30 m fixed	3 H x 2 W in. (76.7 x 51.3 mm)	Check	Order
HRDR431A1R	120 V ac	Non-isolated SPDT	-40° to 85°C (-40° to 185°F)	ON time first: 1 - 100 s externally adjustable; OFF: 1 - 100 s externally adjustable	3 H x 2 W in. (76.7 x 51.3 mm)	Check	Order