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 - ONTime First)
Upon application of input voltage, the output relay energizes and
theT2 ON time begins. At the end of the ON time, the output
de-energizes and theT1 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.
Operation (Recycling - OFFTime First)
Upon application of input voltage, theT1 OFF time begins. At
the end of the OFF time, theT2 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.
Wiring Diagram
L1
N/L2
Reset: Removing input voltage resets the output and the
V = Voltage
sequence to the OFF time.
C = Common
NO = Normally Open
NC = Normally Closed
T1 = OFF Time
T2 = ON Time
Features & Benefits
FEATURES
BENEFITS
Compact design and
independent adjustment
of ON and OFF times
Provides greater flexibility for OEM applications and
reduces component and labor costs
A knob is supplied for
adjustable units.
Repeat Accuracy + / - 0.5%,
Factory calibration + / - 5%
Microcontroller based
Isolated, 10A, SPDT
output contacts
Allows control of loads for AC or DC voltages
Protects against shock, vibration, and humidity
Encapsulated
Ordering Information
Accessories
INPUT
T2 ON
TIME
FIRST
DELAY
T1 OFF
TIME
P1023-6 Mounting bracket
MODEL
ADJUST.
VOLT.
The 90° orientation of mounting slots makes
installation/removal of modules quick and easy.
KRDR115MB25M 12VDC Fixed
5m
Off time 25m
KRDR120A0
KRDR121A1
KRDR320B0
KRDR321A4
KRDR321B4
KRDR420A3
KRDR421A4
KRDR424A0
KRDR424A4
12VDC Adjustable 0.1 - 10s On time 0.1 - 10s
12VDC Adjustable 1 - 100s On time 1 - 100s
24VDC Adjustable 0.1 - 10s Off time 0.1 - 10s
24VDC Adjustable 1 - 100s On time 1 - 100m
24VDC Adjustable 1 - 100s Off time 1 - 100m
120VAC Adjustable 0.1 - 10s On time 0.1 - 10m
120VAC Adjustable 1 - 100s On time 1 - 100m
120VAC Adjustable 1 - 100m On time 0.1 - 10s
120VAC Adjustable 1 - 100m On time 1 - 100m
On time
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.
KRDR440.5SA0
120VAC
0.5s
On time 0.1 - 10s
fixed
If you don’t find the part you need, call us for a custom product 800-843-8848
P1023-20 DIN Rail Adapter
Allows module to be mounted on a 35 mm DIN
type rail with two #10 screws.
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/krdr
Rev: 1-A-061016
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