krdb series - Littelfuse

krdb series - Littelfuse
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
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.
FEATURES
BENEFITS
Microcontroller based
Repeat accuracy + / - 0.5%,
Factory calibration + / - 5%
Isolated, 10A, SPDT
output contacts
Allows control of loads for AC or DC voltages
Encapsulated
No moving parts to arc and wear out over time and
encapsulated to protect against shock, vibration,
and humidity
Compact, low cost
design measuring 2 in.
(50.8mm) square
Allows flexiblility for OEM applications
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
12VDC
Fixed
0.1s
KRDB31120S
24VDC
Fixed
20s
KRDB112.5S
12VDC
Fixed
2.5s
KRDB415S
120VAC
Fixed
5s
KRDB1120M
12VDC
Fixed
20m
KRDB4160S
120VAC
Fixed
60s
KRDB115M
12VDC
Fixed
5m
KRDB420
120VAC
Onboard
0.1 - 10s
KRDB120
12VDC
Onboard
0.1 - 10s
KRDB421
120VAC
Onboard
1 - 100s
KRDB124
12VDC
Onboard
1 - 100m
KRDB422
120VAC
Onboard
10 - 1000s
KRDB21180S
24VAC/DC
Fixed
180s
KRDB423
120VAC
Onboard
0.1 - 10m
KRDB217S
24VAC/DC
Fixed
7s
KRDB424
120VAC
Onboard
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.
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 RT terminals; as the resistance increases the tie
delay increases.
When selecting an external RT, add the tolerances of the timer and the RT
for the full time range adjustment.
Examples: 1 to 50 S adjustable time delay, select time delay range 1 and
a 50 K ohn RT. For 1 to 100 S use a 100 K ohm RT.
Output Current/Ambient Temperature
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 107; Electrical - 1 x 105
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
DimensionsH 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)
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/krdb
V = Voltage
S1 = Initiate Switch
NO = Normally
Open Contact
NC = Normally
Closed Contact
TD = Time Delay
t = Incomplete
Time Delay
R = Reset
= Undefined
Time
Rev: 1-A-062216
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