KRDB Series - Delay On Break Timer

Littelfuse Delay on Break timers
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The KRDB 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 KRDB Series is a cost effective approach for OEM applications that require small size, isolation, reliability, and long life.

Operation (Delay-on-Break)
Input voltage must be applied before and during timing. Upon closure of the initiate switch, the output relay energizes. The time delay begins when the initiate switch is opened. The output remains energized during timing. At the end of the time delay, the output de-energizes. The output will energize if the initiate switch is closed when input voltage is applied.
Reset: Reclosing the initiate switch during timing resets the time delay. Loss of input voltage resets the time delay and output.

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)
Storage Temperature (F/C)Time Delay RangeSample CapableCompare
KRDB110.1S12VDCSPDT-40° to 85°C (-40°F to 185°F)0.1s fixedNo
KRDB112.5S12VDCSPDT-40° to 85°C (-40°F to 185°F)2.5s fixedNo
KRDB1120M12VDCSPDT-40° to 85°C (-40°F to 185°F)20m fixedNo
KRDB115M12VDCSPDT-40° to 85°C (-40°F to 185°F)5m fixedNo
KRDB12012VDCSPDT-40° to 85°C (-40°F to 185°F)0.1 - 10s onboard adjustableNo
KRDB12412VDCSPDT-40° to 85°C (-40°F to 185°F)1 - 100m onboard adjustableNo
KRDB217S24VAC/DCSPDT-40° to 85°C (-40°F to 185°F)7s fixedNo
KRDB31120S24VDCSPDT-40° to 85°C (-40°F to 185°F)20s fixedNo
KRDB415S120VACSPDT-40° to 85°C (-40°F to 185°F)5s fixedNo
KRDB420120VACSPDT-40° to 85°C (-40°F to 185°F)0.1 - 10s onboard adjustableNo
KRDB421120VACSPDT-40° to 85°C (-40°F to 185°F)1 - 100s onboard adjustableNo
KRDB422120VACSPDT-40° to 85°C (-40°F to 185°F)10 - 1 000s onboard adjustableNo
KRDB423120VACSPDT-40° to 85°C (-40°F to 185°F)0.1 - 10m onboard adjustableNo
KRDB424120VACSPDT-40° to 85°C (-40°F to 185°F)1 - 100m onboard adjustableNo