Time Delay Relays
Multifunction
TRDU SERIES
Description
The TRDU Series is a versatile universal time delay relay with 21
selectable single and dual functions. The dual functions replace
up to three timers required to accomplish the same function.
Both the function and the timing range are selectable with
switches located on the face of the unit. Two LED’s indicate
input voltage and output status. This device offers full 10A
isolated relay output contacts in either SPDT or DPDT. The
TRDU replaces hundreds of part numbers, thereby, reducing
your stock inventory requirements.
21 Functions
Five switches are provided to set one of 10 single or 11 dual
modes of operation.
8-PIN
11-PIN
Wiring Diagram
L1
N/L2
L1
N/L2
Features & Benefits
FEATURES
Multifunction:
21 timing functions
Microcontroller based
User selectable
time delay
BENEFITS
Replace hundreds of parts and reduce stocking
requirements
Repeat Accuracy + / - 0.1%
Timing settings are switch selectable 0.1s - 1,705h
in eight ranges for added flexibility
Allows control of loads for AC or DC voltages
Provides visual indication of input voltage and
relay status
L1
N/L2
L1
N/L2
Isolated 10A, SPDT or
DPDT output contacts
LED indicators
8-PIN DPDT
L1
N/L2
8-PIN SPDT
Accessories
V = Voltage
S1 = Initiate Switch
L1
N/L2
L1
N/L2
BZ1 Front Panel Mount Kit
Provides an easy method of through-the-panel
mounting of 8- or 11-pin plug-in timers, flashers,
and other controls.
NDS-8 Octal 8-pin Socket
8-pin 35mm DIN rail or surface mount. Surface
mounted with two #6 screws or snaps onto a
35 mm DIN rail. Uses PSC8 hold-down clips.
NDS-11 11-pin Socket
11-pin 35mm DIN rail or surface mount. Surface
mounted with two #6 screws or snaps onto a
35 mm DIN rail. Uses PSC11 hold-down clips.
PSC8 or PSC11 Hold-down Clips
Securely mounts plug-in controls in any position.
Provides protection against vibration. Use PSC8
with NDS-8 Octal Socket or PSC11 with NDS-11
Socket. Sold in sets of two.
C103PM (AL) DIN Rail
35 mm aluminum DIN rail available in a 36 in.
(91.4 cm) length.
L1
N/L2
11-PIN DPDT
Ordering Information
MODEL
L1
N/L2
INPUT VOLTAGE
BASE CONNECTION
TRDU120A1
TRDU120A2
TRDU120A3
TRDU12D1
TRDU12D2
TRDU230A2
TRDU24A1
TRDU24A2
TRDU24A3
120VAC
120VAC
8-pin, DPDT*
8-pin, SPDT
11-pin, DPDT
8-pin, DPDT*
8-pin, SPDT
8-pin, SPDT
8-pin, DPDT*
8-pin, SPDT
11-pin, DPDT
120VAC
12VDC
12VDC
230VAC
24VAC/DC
24VAC/DC
24VAC/DC
If you don’t find the part you need, call us for a custom product 800-843-8848
*Limited to 9 operating functions in 8-pin DPDT units.
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/trdu
Rev: 1-A-062216
Time Delay Relays
Multifunction
TRDU SERIES
Specifications
Time Delay
Type
Microcontroller
Range: Switch Selectable**
Single Functions: 0.1s - 1,705h in 8 ranges
Dual Functions: 0.1s - 3,100m each in 8 ranges
Adjustments
Multiplier: 3 position DIP switches select
0.1, 1, 10, or 100 in s or m
Setting Accuracy
±1% or 50ms, whichever is greater
Repeat Accuracy
±0.1% or 20ms, whichever is greater
Timing Functions
Five switches are provided to set one of
twenty-one single or dual functions
Reset Time
≤ 50ms
Initiate Time
120VAC: 75ms
Time Delay vs Temp.
& Voltage
±1%
Indication
Two LEDs indicate
1)
Input voltage applied
2)
Output relay status
Input
Voltage
12VDC, 24VAC/DC, 120VAC, or 230VAC
Tolerance
12VDC & 24VAC/DC
-15% - 20%
120 & 230VAC
-20% - 10%
AC Line Frequency
50/60Hz
Power Consumption
24 to 230V ≤ 3W; 12VDC ≤ 2W
Output
Type
Electromechanical relay
Form
SPDT or DPDT
Rating
10A resistive @ 120/240VAC & 28 VDC;
1/3 hp @ 120/240VAC
Life
Mechanical – 1 x 10
7
; Electrical – 1 x 10
6
Protection
Isolation Voltage
Insulation Resistance
Polarity
Mechanical
Mounting
Dimensions
Termination
Environmental
Operating/Storage
Temperature
Weight
≥ 1500V RMS input to output
≥ 100 MΩ
DC units are reverse polarity protected
Plug-in socket
H
76.7 mm (3.1”);
W
60.7 mm (2.39”);
D
45.2 mm (1.78”)
Octal 8-pin plug-in or magnal 11-pin plug-in
-20° to 65°C / -40° to 85°C
≅
5.8 oz (164 g)
**For CE approved applications, power must be removed from the unit when a switch position
is changed.
Function Diagrams
Single Functions
DELAY-ON-MAKE (ON-DELAY)
Dual Functions
*
V = Voltage
NO = Normally
Open Contact
NC = Normally
Closed Contact
TD = Time Delay
R = Reset
= Undefined
Time
DELAY-ON-MAKE/DELAY-ON-BREAK
DELAY-ON-BREAK
DELAY-ON-MAKE / RECYCLE
(ON TIME FIRST)
*
RECYCLE (ON TIME
FIRST, EQUAL DELAYS)
*
DELAY-ON-MAKE/INTERVAL
*
SINGLE SHOT
DELAY-ON-MAKE / SINGLE SHOT
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/trdu
Rev: 1-A-062216
Time Delay Relays
Multifunction
TRDU SERIES
Single Functions
INTERVAL
*
Dual Functions
INTERVAL / RECYCLE
(ON TIME FIRST)
*
TRAILING EDGE SINGLE SHOT
(IMPULSE-OFF)
DELAY-ON-BREAK / RECYCLE
(ON TIME FIRST)
INVERTED SINGLE SHOT
SINGLE SHOT / RECYCLE
(ON TIME FIRST)
US
INVERTED DELAY-ON-BREAK
RECYCLE (ON TIME FIRST)
*
Both Times Adjustable
RETRIGGERABLE SINGLE SHOT
(MOTION DETECTOR) (PSD)
ACCUMULATIVE
DELAY-ON-MAKE
V = Voltage
S1 = Initiate Switch
NO = Normally
Open Contact
NC = Normally
Closed Contact
t = Incomplete
Time Delay
TD = Time Delay
R = Reset
RECYCLE (OFF TIME FIRST)
*
Both Times Adjustable
INTERVAL / DELAY-ON-MAKE
*
V = Voltage
NO = Normally
Open Contac
NC = Normally
Closed Cont
TD1, TD2 = Time D
R = Reset
KEY
LEGEND
ACCUMULATIVE
DELAY-ON-MAKE / INTERVAL
5 Switches for
Function Selection
3 Switches for Time
Delay Range
V = Voltage
R = Reset
S1 = Initiate Switch
NO = Normally Open Contact
NC = Normally Closed Contact
TD,TD1,TD2 = Complete Time Delay
t = Partial Time Delay
DOM = Delay-on-Make
DOB = Delay-on-Break
REC = Recycle
SS = Single Shot
INT = Interval
M = Minutes
S = Seconds
= Undefined time
*
9 Functions included in the 8 pin DPDT models
NOTE: The time delay range is the same for both functions when dual functions are selected.
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/trdu
Rev: 1-A-062216
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