© 2016 Littelfuse Protection Relays & Controls
Time Delay Relays
Multifunction
www.littelfuse.com/trdu
Rev: 1-A-062216
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.
Features & Benefits
FEATURES BENEFITS
Multifunction:
21 timing functions
Replace hundreds of parts and reduce stocking
requirements
Microcontroller based Repeat Accuracy + / - 0.1%
User selectable
time delay
Timing settings are switch selectable 0.1s - 1,705h
in eight ranges for added flexibility
Isolated 10A, SPDT or
DPDT output contacts
Allows control of loads for AC or DC voltages
LED indicators
Provides visual indication of input voltage and
relay status
Accessories
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
L1 N/L2
L1 N/L2
L1 N/L2
L1 N/L2
L1 N/L2
L1 N/L2
L1 N/L2
L1 N/L2
V = Voltage
S1 = Initiate Switch
8-PIN DPDT
8-PIN SPDT
11-PIN DPDT
Wiring Diagram
8-PIN
11-PIN
Ordering Information
MODEL INPUT VOLTAGE BASE CONNECTION
TRDU120A1
120VAC
8-pin, DPDT*
TRDU120A2
120VAC
8-pin, SPDT
TRDU120A3 120VAC 11-pin, DPDT
TRDU12D1 12VDC 8-pin, DPDT*
TRDU12D2 12VDC 8-pin, SPDT
TRDU230A2 230VAC 8-pin, SPDT
TRDU24A1 24VAC/DC 8-pin, DPDT*
TRDU24A2 24VAC/DC 8-pin, SPDT
TRDU24A3 24VAC/DC 11-pin, DPDT
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
Time Delay Relays
Multifunction
www.littelfuse.com/trdu
Rev: 1-A-062216
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 ≥ 1500V RMS input to output
Insulation Resistance ≥ 100 MΩ
Polarity DC units are reverse polarity protected
Mechanical
Mounting Plug-in socket
Dimensions H 76.7 mm (3.1”); W 60.7 mm (2.39”);
D 45.2 mm (1.78”)
Termination Octal 8-pin plug-in or magnal 11-pin plug-in
Environmental
Operating/Storage
Temperature -20° to 65°C / -40° to 85°C
Weight ≅ 5.8 oz (164 g)
**For CE approved applications, power must be removed from the unit when a switch position
is changed.
Function Diagrams
DELAY-ON-BREAK
RECYCLE (ON TIME
FIRST, EQUAL DELAYS)
DELAY-ON-MAKE/DELAY-ON-BREAK
DELAY-ON-MAKE/INTERVAL
DELAY-ON-MAKE / RECYCLE
(ON TIME FIRST)
Dual FunctionsSingle Functions
DELAY- ON-MAKE (ON-DELAY)
V = Voltage
NO = Normally
Open Contact
NC = Normally
Closed Contact
TD = Time Delay
R = Reset
= Undefined
Time
SINGLE SHOT
DELAY-ON-MAKE / SINGLE SHOT
*
*
*
*