Time Delay Relays
Dedicated - Delay-on-Break
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
Wiring Diagram
L1
N/L2
FEATURES
Microcontroller based
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.
BENEFITS
Repeat accuracy + / - 0.5%,
Factory calibration + / - 5%
Allows control of loads for AC or DC voltages
No moving parts to arc and wear out over time and
encapsulated to protect against shock, vibration,
and humidity
Allows flexiblility for OEM applications
Isolated, 10A, SPDT
output contacts
Encapsulated
Compact, low cost
design measuring 2 in.
(50.8mm) square
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.
Ordering Information
MODEL
INPUT VOLTAGE
ADJUSTMENT
TIME DELAY
MODEL
INPUT VOLTAGE
ADJUSTMENT
TIME DELAY
KRDB110.1S
KRDB112.5S
KRDB1120M
KRDB115M
KRDB120
KRDB124
KRDB21180S
KRDB217S
12VDC
12VDC
12VDC
12VDC
12VDC
12VDC
24VAC/DC
24VAC/DC
Fixed
Fixed
Fixed
Fixed
Onboard
Onboard
Fixed
Fixed
0.1s
2.5s
20m
5m
0.1 - 10s
1 - 100m
180s
7s
KRDB31120S
KRDB415S
KRDB4160S
KRDB420
KRDB421
KRDB422
KRDB423
KRDB424
24VDC
120VAC
120VAC
120VAC
120VAC
120VAC
120VAC
120VAC
Fixed
Fixed
Fixed
Onboard
Onboard
Onboard
Onboard
Onboard
20s
5s
60s
0.1 - 10s
1 - 100s
10 - 1000s
0.1 - 10m
1 - 100m
If you don’t find the part you need, call us for a custom product 800-843-8848
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/krdb
Rev: 1-A-062216
Time Delay Relays
Dedicated - Delay-on-Break
KRDB SERIES
Accessories
P1015-64
(AWG 14/16)
Female Quick Connect
These 0.25 in. (6.35 mm) female terminals are
constructed with an insulator barrel to provide
strain relief.
P1015-18 Quick Connect to Screw Adapter
Screw adapter terminal designed for use with
all modules with 0.25 in. (6.35 mm) male quick
connect terminals.
C103PM (AL) DIN Rail
35 mm aluminum DIN rail available in a 36 in.
(91.4 cm) length.
P1023-20 DIN Rail Adapter
Allows module to be mounted on a 35 mm DIN
type rail with two #10 screws.
Specifications
Time Delay
Type
Range
Repeat Accuracy
Tolerance
(Factory Calibration)
Recycle Time
Initiate Time
Time Delay vs Temp.
& Voltage
Input
Voltage
Tolerance
12VDC & 24VDC/AC
110VDC, 120 or 230VAC
AC Line Frequency/DC Ripple
Power Consumption
Output
Type
Form
Rating (at 40°C)
Max. Switching Voltage
Life (Operations)
Protection
Circuitry
Isolation Voltage
Insulation Resistance
Polarity
Mechanical
Mounting
Dimensions
Termination
Environmental
Operating/Storage
Temperature
Humidity
Weight
Microcontroller with watchdog circuitry
0.1s - 1000m in 6 adjustable ranges or fixed
±0.5% or 20ms, whichever is greater
≤ ±5%
≤ 150ms
≤ 40ms
≤ ±5%
12, 24, 110VDC; 24, 120 or 230VAC
-15% - 20%
-20% - 10%
50/60 Hz / ≤ 10%
AC ≤ 2VA; DC ≤ 2W
Isolated relay contacts
SPDT
10A resistive @ 125VAC;
5A resistive @ 230VAC & 28VDC;
1/4 hp @ 125VAC
250VAC
Mechanical - 1 x 10
7
; Electrical - 1 x 10
5
Encapsulated
≥ 1500V RMS input to output
≥ 100 MΩ
DC units are reverse polarity protected
Surface mount with one #10 (M5 x 0.8) screw
H
50.8 mm (2.0”);
W
50.8 mm (2.0”);
D
30.7 mm (1.21”)
0.25 in. (6.35 mm) male quick connect terminals
External Resistance vs. Time Delay
This chart applies to externally adjustable part numbers.
The time delay is adjustable over the time delay range selected by varying
the resistance across the R
T
terminals; as the resistance increases the tie
delay increases.
When selecting an external R
T
, add the tolerances of the timer and the R
T
for the full time range adjustment.
Examples:
1 to 50 S adjustable time delay, select time delay range 1 and
a 50 K ohn R
T
. For 1 to 100 S use a 100 K ohm R
T
.
-40° to 60°C / -40° to 85°C
95% relative, non-condensing
≅
2.6 oz (74 g)
Output Current/Ambient Temperature
Function Diagram
DELAY-ON-BREAK (OFF-DELAY)
V = Voltage
S1 = Initiate Switch
NO = Normally
Open Contact
NC = Normally
Closed Contact
TD = Time Delay
t = Incomplete
Time Delay
R = Reset
= Undefined
Time
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/krdb
Rev: 1-A-062216
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Littelfuse
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KRDB415S KRDB124 KRDB1120M KRDB112.5S KRDB424 KRDB422 KRDB423 KRDB31120S KRDB4160S
KRDB120 KRDB110.1S KRDB420 KRDB217S KRDB21180S KRDB421 KRDB115M
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