Time Delay Relays
Multifunction
TRU SERIES
Knob Adjustable Universal Time Delay Relay
Description
8-PIN
The TRU Series is a multifunction, knob adjustable, Universal
Time Delay Relay. It includes six of the most popular timing
functions selected by a slide switch. The time delay is knob
adjustable and the time delay range is switch selectable.
The repeat accuracy is + 0.1%. Both function and time range
can be selected on the top face of the unit. In addition to
multifunctioning and multiple time ranges, the TRU Series
features universal input voltage; 19 to 264VAC and 19 to 30VDC
and full 10A output relay. The TRU Series can directly replace up
to 1000 competitive time delay relay models.
Operation
A six position slide switch selects delay-on-make, interval,
single shot, recycling (ON time first, equal recycle delays),
delay-on-break, and retriggerable single shot. 8-pin DPDT
base wiring is limited to delay-on-make, interval, and recycling
functions. All six functions are available in the 8-pin SPDT and
11-pin DPDT versions.
11-PIN
Wiring Diagram
8-PIN DPDT
Delay-on-Make
Interval
Recycling
L1
N/L2
8-PIN SPDT
Delay-on-Make
Interval
Single Shot
Recycling
(ON Time First, Equal
Recycle Delays)
Delay-on-Break
Retriggerable Single Shot
11-PIN DPDT
Delay-on-Make
Interval
Single Shot
Recycling
(ON Time First, Equal
Recycle Delays)
Delay-on-Break
Retriggerable Single Shot
V = Voltage
S1 = Initiate Switch
Relay contacts
are isolated
L1
N/L2
Features & Benefits
FEATURES
Microcontroller based
6 time ranges
(0.1s to 1,000m)
Knob adjustable
time delay
Universal input voltage
Multifunction
LED Indicators
BENEFITS
Repeat Accuracy + / - 0.1% or + / - 20ms, whichever
is greater
Broad range will satisfy most requirements
Allows user to fine tune time delay based on
application needs
Makes it versatile for use in most applications
Provides the most common standard
timing functions
Provide visual indication of input voltage and
relay status
Allows control of loads for AC or DC voltages
L1
N/L2
Ordering Information
MODEL
INPUT VOLTAGE
BASE WIRING
FUNCTIONS
10A isolated
output contacts
TRU1
TRU2
TRU3
19 to 264VAC; 19 to 30VDC
19 to 264VAC; 19 to 30VDC
19 to 264VAC; 19 to 30VDC
8-pin DPDT
8-pin SPDT
11-pin DPDT
3
6
6
If you don’t find the part you need, call us for a custom product 800-843-8848
© 2018 Littelfuse Protection Relays & Controls
www.littelfuse.com/tru
www.littelfuse.com/
Rev: 1-A-032318
Time Delay Relays
Multifunction
TRU SERIES
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. Rated
at 10A @ 300VAC. Surface mounted with two
#6 (M 3.5 x 0.6) 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. Rated
at 10A @ 300VAC. Surface mounted with two
#6 (M 3.5 x 0.6) 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 pairs.
Specifications
Time Delay
Type
Range
Switch Selectable
Digital integrated circuitry
0.1s - 1000m in 6 ranges:
1)
0.1 - 10s
2)
1 - 100s
3)
10 - 1000s
4)
0.1 - 10m
5)
1 - 100m
6)
10 - 1000m
4 position DIP switch selects
x0.1, x1, x10, and sec. or min.
Onboard knob adjustment with 1 - 100
reference dial
1)
Input voltage applied
2)
Output relay status
±0.1% or ±20ms, whichever is greater
≤ 300ms
±2%
Adjustments
Multiplier
Time Setting
Two LEDs indicate
Repeat Accuracy
Reset Time
Time Delay vs Temp.
& Voltage
Input
Voltage - Universal
Input Range
AC Line Frequency
Output
Type
Form
Rating
Life
Protection
Transient
Isolation Voltage
Polarity
Mechanical
Mounting
Dimensions
Termination
Environmental
Operating/Storage
Temperature
Weight
Function Diagram
RETRIGGERABLE SINGLE SHOT
(MOTION DETECTOR) (PSD)
V = Voltage
S1 = Initiate Switch
NO = Normally
Open Contact
NC = Normally
Closed Contact
t = Incomplete
Time Delay
TD = Time Delay
R = Reset
19 to 264VAC and 19 to 30VDC
50/60Hz
Electromechanical relay
SPDT or DPDT, isolated
10A resistive @ 120/240VAC & 28VDC;
1/3 hp @ 120/240VAC
Mechanical - 1 x 10
7
; Electrical - 1 x 10
6
38 joules
≥ 1500V RMS input to output
DC units are reversed polarity protected
Plug-in socket
H
87.3 mm (3.44”);
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 / -30° to 85°C
≅
6 oz (170 g)
Disclaimer Notice –
Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products
are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at
www.littelfuse.com/product-disclaimer.
© 2018 Littelfuse Protection Relays & Controls
www.littelfuse.com/tru
www.littelfuse.com/
Rev: 1-A-032318
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