Time Delay Relays
Dedicated - Recycle
KRDR SERIES
Description
The KRDR Series is a compact time-delay relay measuring only
2 in. (50.8 mm) square. Its solid-state timing circuit provides
excellent repeat accuracy and stability. Encapsulation protects
against shock, vibration, and humidity. The KRDR Series is a cost
effective recycling timer for OEM applications that require small
size, isolation, reliability, and long life.
Operation (Recycling - ON Time First)
Upon application of input voltage, the output relay energizes and
the T2 ON time begins. At the end of the ON time, the output
de-energizes and the T1 OFF time begins. At the end of the OFF
time, the output relay energizes and the cycle repeats as long as
input voltage is applied
Reset:
Removing input voltage resets the output and the time
delays, and returns the sequence to the ON time.
Wiring Diagram
L1
N/L2
Operation (Recycling - OFF Time First)
Upon application of input voltage, the T1 OFF time begins. At
the end of the OFF time, the T2 ON time begins and the load
energizes. At the end of the ON time the load de-energizes, and
the cycle repeats until input voltage is removed.
V = Voltage
C = Common
NO = Normally Open
NC = Normally Closed
T1 = OFF Time
T2 = ON Time
A knob is supplied for
adjustable units.
Reset:
Removing input voltage resets the output and the
sequence to the OFF time.
Features & Benefits
FEATURES
Compact design and
independent adjustment
of ON and OFF times
Microcontroller based
Isolated, 10A, SPDT
output contacts
Encapsulated
BENEFITS
Provides greater flexibility for OEM applications and
reduces component and labor costs
Repeat Accuracy + / - 0.5%,
Factory calibration + / - 5%
Allows control of loads for AC or DC voltages
Protects against shock, vibration, and humidity
Ordering Information
MODEL
INPUT
VOLT.
ADJUST.
T2 ON
TIME
FIRST
DELAY
T1 OFF
TIME
Accessories
5m
0.1 - 10s
1 - 100s
0.1 - 10s
1 - 100s
1 - 100s
0.1 - 10s
1 - 100s
1 - 100m
1 - 100m
0.5s
Off time
On time
On time
Off time
On time
Off time
On time
On time
On time
On time
On time
25m
0.1 - 10s
1 - 100s
0.1 - 10s
1 - 100m
1 - 100m
0.1 - 10m
1 - 100m
0.1 - 10s
1 - 100m
0.1 - 10s
P1023-6 Mounting bracket
The 90° orientation of mounting slots makes
installation/removal of modules quick and easy.
P1015-13
(AWG 10/12),
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.
Rev: 1-A-061016
KRDR115MB25M 12VDC
KRDR120A0
KRDR121A1
KRDR320B0
KRDR321A4
KRDR321B4
KRDR420A3
KRDR421A4
KRDR424A0
KRDR424A4
KRDR440.5SA0
12VDC
12VDC
24VDC
24VDC
24VDC
Fixed
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
120VAC Adjustable
120VAC Adjustable
120VAC Adjustable
120VAC Adjustable
120VAC
On time
fixed
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/krdr
Time Delay Relays
Dedicated - Recycle
KRDR SERIES
Output Current/Ambient Temperature
Specifications
Time Delay
Range
Repeat Accuracy
Tolerance
(Factory Calibration)
Reset 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
0.1s - 1000m in 6 adjustable ranges or fixed
±0.5 % or 20ms, whichever is greater
≤ ±5%
≤ 150ms
≤ ±5%
12, 24 or 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”);
W
50.8 mm (2”);
D
30.7 mm (1.21”)
0.25 in. (6.35 mm) male quick connect terminals
-20°
to 60°C / -40° to 85°C
95% relative, non-condensing
≅
2.6 oz (74 g)
Function Diagrams
RECYCLING (ON FIRST)
RECYCLE (OFF TIME FIRST)
V = Voltage
NO = Normally
Open Contact
NC = Normally
V = Voltage Contact
Closed
NO = OFF Time Open
= Normally
TD1
Contact
TD2 = ON Time
NC = Normally Closed
R = Reset
Contact
V = Voltage
T1 = OFF Time
NO = Normally
T2 = ON Time
Open Contact
R = Reset
NC = Normally
Closed Contact
TD1, TD2 = Time Delay
R = Reset
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/krdr
Rev: 1-A-061016
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