Time Delay Relays
Dedicated - Delay-on-Make
KRDM SERIES
Description
The KRDM 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 KRDM Series is a
cost effective approach for OEM applications that require small
size, isolation, reliability, and long life.
Operation (Delay-on-Make)
Upon application of input voltage, the time delay begins. The
output is de-energized before and during the time delay. At the
end of the time delay, the output relay energizes and remains
energized until input voltage is removed.
Reset: Removing input voltage resets the time delay and output.
Features & Benefits
FEATURES
BENEFITS
Microcontroller based
Repeat Accuracy + / - 0.5%
Compact, low
cost design
Allows flexiblility for OEM applications
Wiring Diagram
Isolated, 10A, SPDT
output contacts
Allows control of loads for AC or DC voltages
Protects against shock, vibration, and humidity
L1 N/L2
V = Voltage
C = Common,Transfer Contact
NO = Normally Open
Encapsulated
NC = Normally Closed
Accessories
A knob is supplied for adjustable
units, or RT terminals 4 & 5 for
external adjust. See external
adjustment vs time delay chart.
Relay contacts are isolated.
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
10s
MODEL
INPUT VOLTAGE
120VAC
ADJUSTMENT
Fixed
TIME DELAY
10m
KRDM1110S
KRDM1130S
KRDM120
12VDC
Fixed
KRDM4110M
KRDM4110S
KRDM4145S
KRDM420
KRDM421
KRDM424
KRDM430
KRDM433
KRDM6115M
12VDC
Fixed
30s
120VAC
Fixed
10s
12VDC
Onboard knob
Onboard knob
Fixed
0.1 - 10s
1 - 100s
10m
120VAC
Fixed
45s
KRDM121
12VDC
120VAC
Onboard knob
Onboard knob
Onboard knob
External
0.1 - 10s
1 - 100s
1 - 100m
0.1 - 10s
0.1 - 10m
15m
KRDM2110M
KRDM215M
KRDM220
24VAC/DC
24VAC/DC
24VAC/DC
24VAC/DC
24VAC/DC
24VDC
120VAC
Fixed
5m
120VAC
Onboard knob
Onboard knob
Onboard knob
Fixed
0.1 - 10s
1 - 100s
0.1 - 10m
0.2s
120VAC
KRDM221
120VAC
External
KRDM223
230VAC
Fixed
KRDM310.2S
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/krdm
Rev: 1-A-062216