Name: KRDS Series - Single Shot Timer
Brand: Littelfuse Inc.

KRDS Series - Single Shot Timer

Series: KRDS

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 KRDS Series is a compact time delay relay measuring only 2 in. (50.8 mm) square. Its microcontroller timing circuit provides excellent repeat accuracy and stability. Encapsulation protects against shock, vibration, and humidity. The KRDS Series is a cost effective approach for OEM applications that require small size, isolation, reliability, and long life.

Operation (Single Shot)
Input voltage must be applied before and during timing. Upon momentary or maintained closure of the initiate switch, the output relay energizes for a measured interval of time. At the end of the delay, the output de-energizes. Opening or reclosing the initiate switch during timing has no affect on the time delay. The output will energize if the initiate switch is closed when input voltage is applied.
Reset: Reset occurs when the time delay is complete and the initiate switch is opened. Loss of input voltage resets the time delay and output.

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

KRDS120	12 V dc	SPDT	-40° to 85°C (-40° to 185°F)	0.1 - 10 s onboard adjustable	2 H x 2 W in. (50.8 x 50.8 mm)	Check	Order
KRDS221	24 V ac/dc	SPDT	-40° to 85°C (-40° to 185°F)	1 - 100 s onboard adjustable	2 H x 2 W in. (50.8 x 50.8 mm)	Check	Order
KRDS420	120 V ac	SPDT	-40° to 85°C (-40° to 185°F)	0.1 - 10 s onboard adjustable	2 H x 2 W in. (50.8 x 50.8 mm)	Check	Order
KRDS421	120 V ac	SPDT	-40° to 85°C (-40° to 185°F)	1 - 100 s onboard adjustable	2 H x 2 W in. (50.8 x 50.8 mm)	Check	Order
KRDS424	120 V ac	SPDT	-40° to 85°C (-40° to 185°F)	1 - 100 m onboard adjustable	2 H x 2 W in. (50.8 x 50.8 mm)	Check	Order
KRDS430	120VAC	SPDT	-40° to 85°C (-40°F to 185°F)	0.1 - 10s externally adjustable	2.00 x 2.00 x 1.21 in. (50.8 x 50.8 x 30.7mm)