Cut Sheet

© 2016 Littelfuse Protection Relays & Controls
Time Delay Relays
Dedicated - Delay-on-Break
Rev: 1-A-062216
www.littelfuse.com/krdb
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.
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.
W
hen 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
.
Output Current/Ambient Temperature
KRDB SERIES
Specifications
Time Delay
Type Microcontroller with watchdog circuitry
Range 0.1s - 1000m in 6 adjustable ranges or fixed
Repeat Accuracy ±0.5% or 20ms, whichever is greater
Tolerance
(Factory Calibration) ≤ ±5%
Recycle Time ≤ 150ms
Initiate Time ≤ 40ms
Time Delay vs Temp.
& Voltage ≤ ±5%
Input
Voltage 12, 24, 110VDC; 24, 120 or 230VAC
Tolerance
12VDC & 24VDC/AC -15% - 20%
110VDC, 120 or 230VAC -20% - 10%
AC Line Frequency/DC Ripple 50/60 Hz / ≤ 10%
Power Consumption AC ≤ 2VA; DC ≤ 2W
Output
Type Isolated relay contacts
Form SPDT
Rating (at 40°C) 10A resistive @ 125VAC;
5A resistive @ 230VAC & 28VDC;
1/4 hp @ 125VAC
Max. Switching Voltage 250VAC
Life (Operations) Mechanical - 1 x 10
7
; Electrical - 1 x 10
5
Protection
Circuitry Encapsulated
Isolation Voltage ≥ 1500V RMS input to output
Insulation Resistance ≥ 100 MΩ
Polarity DC units are reverse polarity protected
Mechanical
Mounting Surface mount with one #10 (M5 x 0.8) screw
Dimensions H 50.8 mm (2.0”); W 50.8 mm (2.0”);
D 30.7 mm (1.21”)
Termination 0.25 in. (6.35 mm) male quick connect terminals
Environmental
Operating/Storage
Temperature -40° to 60°C / -40° to 85°C
Humidity 95% relative, non-condensing
Weight ≅ 2.6 oz (74 g)
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