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ManualsBrandsLittelfuse ManualsControl & Automation10A,1s-10s, Relays 2X2D.O.B.W/Relay
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© 2016 Littelfuse Protection Relays & Controls
Time Delay Relays
Dedicated - Delay-on-Break
Rev: 1-A-062216
www.littelfuse.com/krdb
KRDB SERIES
Description
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.
Features & Benefits
FEATURES BENEFITS
Microcontroller based
Repeat accuracy + / - 0.5%,
Factory calibration + / - 5%
Isolated, 10A, SPDT
output contacts
Allows control of loads for AC or DC voltages
Encapsulated
No moving parts to arc and wear out over time and
encapsulated to protect against shock, vibration,
and humidity
Compact, low cost
design measuring 2 in.
(50.8mm) square
Allows flexiblility for OEM applications
Accessories
P1004-95, P1004-95-X Versa-Pot
Panel mountable, industrial potentiometer
recommended for remote time delay adjustment.
P1023-6 Mounting bracket
The 90° orientation of mounting slots makes
installation/removal of modules quick and easy.
P0700-7 Versa-Knob
Designed for 0.25 in (6.35 mm) shaft of
Versa-Pot. Semi-gloss industrial black finish.
Wiring Diagram
L1 N/L2
V = Voltage
S1 = Initiate Switch
C = Common, Transfer Contact
NO = Normally Open
NC = Normally Closed
UTL = Untimed Load (optional)
A knob is supplied for
adjustable units. The untimed
load is optional. Relay contacts
are isolated.
Ordering Information
MODEL INPUT VOLTAGE ADJUSTMENT TIME DELAY MODEL INPUT VOLTAGE ADJUSTMENT TIME DELAY
KRDB110.1S 12VDC Fixed 0.1s KRDB31120S 24VDC Fixed 20s
KRDB112.5S 12VDC Fixed 2.5s KRDB415S 120VAC Fixed 5s
KRDB1120M 12VDC Fixed 20m KRDB4160S 120VAC Fixed 60s
KRDB115M 12VDC Fixed 5m KRDB420 120VAC Onboard 0.1 - 10s
KRDB120 12VDC Onboard 0.1 - 10s KRDB421 120VAC Onboard 1 - 100s
KRDB124 12VDC Onboard 1 - 100m KRDB422 120VAC Onboard 10 - 1000s
KRDB21180S 24VAC/DC Fixed 180s KRDB423 120VAC Onboard 0.1 - 10m
KRDB217S 24VAC/DC Fixed 7s KRDB424 120VAC Onboard 1 - 100m
If you don’t find the part you need, call us for a custom product 800-843-8848

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