Definition:
Time Delay is defined as the controlled period between the functioning of two events. A Time Delay relay is a combination
of an electromechanical output relay and a control circuit. The control circuit is comprised of solid state components and
timing circuits that control operation of the relay and timing range. Typical time delay functions include On-Delay, Repeat
cycle (starting off), Interval, Off-Delay, Retriggerable One Shot, Repeat cycle (starting on), Pulse Generator, One Shot,
On/Off Delay, and Memory Latch. Each function is explained in the table below. Time delay relays have a broad
choice of timing ranges from less than one second to many days. There are many choices of timing adjustments from
calibrated external knobs, DIP switches, thumbwheel switches, or recessed potentiometer. The output contacts on the
electromechanical output relay are direct wired to the output terminals. The contact load ratings are specified for each
specific type of time delay relay.
Understanding the differences between all the functions available in time delay relays can sometimes be a daunting task.
When designing circuits using time delay relays questions such as:
“What initiates a time delay relay?”
“Does the timing start with the application or release of voltage?”
“When does the output relay come on?”
must be asked.
Time delay relays are simply control relays with a time delay built in. Their purpose is to control an event based on time.
The difference between relays and time delay relays is when the output contacts open & close: on a control relay, it
happens when voltage is applied and removed from the coil; on time delay relays, the contacts will open or close before
or after a pre-selected, timed interval.
Typically, time delay relays are initiated or triggered by one of two methods:
• application of input voltage (On Delay, Interval On, Flasher, Repeat Cycle, Delayed Interval & Interval/Flasher).
• opening or closing of a trigger signal (Off Delay, Single Shot & Watchdog).
These trigger signals can be one of two designs:
• a control switch (dry contact), i.e., limit switch, push button, float switch, etc.
• voltage (commonly known as a power trigger).
To help understand, some definitions are important:
Input Voltage: Control voltage applied to the input terminals (see wiring diagrams below). Depending on the function,
input voltage will either initiate the unit or make it ready to initiate when a trigger signal is applied.
Trigger Signal: On certain timing functions, a trigger signal is used to initiate the unit after input voltage has been applied.
As noted above, this trigger signal can either be a control switch (dry contact switch) or a power trigger (voltage).
Output (Load): Every time delay relay has an internal relay (usually mechanical) with contacts that open & close to control
the load. They are represented by the dotted lines in the wiring diagrams. Note that the user must provide the voltage to
power the load being switched by the output contacts of the time delay relay.
The following tables contain both written and visual descriptions on how the common timing functions operate. A Timing
Chart shows the relationship between Input Voltage, Trigger Signal (if present) and Output Contacts.
SECTION 5
Magnecraft Solution Guide 105A
Magnecraft Solution Guide 105A
Time Delay Relays – Application Data
5/2
FUNCTION DEFINITION TABLE
Function Operation Timing Chart
When the input voltage U is applied, timing delay t begins. Relay contacts R
change state after time delay is complete. Contacts R return to their shelf state
when input voltage U is removed. Trigger switch is not used in this function.
When input voltage U is applied, time delay t begins. When time delay t is
complete, relay contacts R change state for time delay t. This cycle will repeat
until input voltage U is removed. Trigger switch is not used in this function.
t
ttt
ttt
When input voltage U is applied, relay contacts R change state immediately
and timing cycle begins. When time delay is complete, contacts return to shelf
state. When input voltage U is removed, contacts will also return to their shelf
state. Trigger switch is not used in this function.
t
Input voltage U must be applied continuously. When trigger switch S is closed,
relay contacts R change state. When trigger switch S is opened, delay t begins.
When delay t is complete, contacts R return to their shelf state. If trigger switch
S is closed before time delay t is complete, then time is reset. When trigger
switch S is opened, the delay begins again, and relay contacts R remain in
their energized state. If input voltage U is removed, relay contacts R return to
their shelf state.
tt
F.
REPEAT CYCLE
Starting On
When input voltage U is applied, relay contacts R change state immediately
and time delay t begins. When time delay t is complete, contacts return to
their shelf state for time delay t. This cycle will repeat until input voltage U is
removed. Trigger switch is not used in this function.
E.
RETRIGGERABLE
ONE SHOT
Upon application of input voltage U, the relay is ready to accept trigger signal S.
Upon application of the trigger signal S, the relay contacts R transfer and the
preset time t begins. At the end of the preset time t, the relay contacts R return to
their normal condition unless the trigger switch S is opened and closed prior to
time out t (before preset time elapses). Continuous cycling of the trigger switch S
at a rate faster than the preset time will cause the relay contacts R to remain
closed. If input voltage U is removed, relay contacts R return to their shelf state.
tt
G.
PULSE
GENERATOR
H.
ONE SHOT
Upon application of input voltage U, a single output pulse of 0.5 seconds is
delivered to relay after time delay t. Power must be removed and reapplied to
repeat pulse. Trigger switch is not used in this function.
Upon application of input voltage U, the relay is ready to accept trigger signal
S. Upon application of the trigger signal S, the relay contacts R transfer and
the preset time t begins. During time-out, the trigger signal S is ignored. The
relay resets by applying the trigger switch S when the relay is not energized.
I.
ON/OFF DELAY
S Make/Break
J.
MEMORY LATCH
S Make
Input voltage U must be applied continuously. When trigger switch S is closed,
time delay t begins. When time delay t is complete, relay contacts R change
state and remain transferred until trigger switch S is opened. If input voltage U
is removed, relay contacts R return to their shelf state.
Input voltage U must be applied continuously. Output changes state with every
trigger switch S closure. If input voltage U is removed, relay contacts R return to
their shelf state.
tt
tt
t t
U
R
U
R
U
R
U
S
R
U
R
U
S
R
U
S
R
U
S
R
R
U
S
U
RtPulse
t
on
off
t
on
off
close
open
on
off
on
off
on
off
close
open
on
off tPulse
on
off
close
open
on
off
close
open
on
off
close
open
tt
t t t
D.
OFF DELAY
S Break
A.
ON DELAY
Power On
C.
INTERVAL
Power On
B.
REPEAT CYCLE
Starting Off
U = Input Voltage S = Trigger Switch R = Relay Contacts t = Time Delay
Magnecraft Solution Guide 105A
SECTION 5
Magnecraft Solution Guide 105A
5/3
Input Indication
Status at a Glance.
Output Indication
Status at a Glance.
Socket Compatible
Mounts Directly On
a DIN Rail or Panel.
Time Adjustment Dial
Fine Tune the Time Setting.
Excellent Immunity to Interference
Conforms to IEC 61812-1/A11.
Mating Hold-Down Clip Available
Secures Relay to Socket.
5/14
SECTION 5
Magnecraft Solution Guide 105A
Magnecraft Solution Guide 105A
Advantages of the TDR782 Time Delay Relay
Time Setting
Select Between
7 Different Time
Scales.
Marked with Both IEC
and NEMA Markings
Universal Socket
Compatibility.
The Complete
System
Solution!
The miniature TDR782 series is a single-function, single-voltage
time delay relay with multiple time ranges for the ultimate in
packaging the most within the smallest space possible in a panel
or on the DIN rail. The TDR782 features a screw driver adjust-
able knob which allows the user to choose 1 of 7 timing ranges
and a large knob on top for fine tuning the timing setting. This
dual adjustment design allows for supreme flexibility and timing
accuracy. The dual LEDs allow the user to know when power is
present at the coil and when the output is energized. When mat-
ed with the Magnecraft sockets and accessories, these ROHS
compliant timers provide a complete modular system that will
meet all your control relay requirements in a package that is
both visually appealing and functionally outstanding.
• Offers a “one stop solution” for your power management system.
• Available as a DPDT and 4PDT to meet your individual needs.
• Switching capabilities of either 3 or 5 amps.
• The two LED status indicators; indicate status at a glance.
• Color and appearance designed to high visibility in all environments.
• Engineering availability allows for customized control system solutions.
www.magnecraft.com 847-441-2540 5/15
Magnecraft Solution Guide 105A
SECTION 5
Magnecraft Solution Guide 105A
WHITE
UL Recognized
File No. E191122
General Specifications (@ 25°C) (UL 508)
SECTION 5
Magnecraft Solution Guide 105A
Magnecraft Solution Guide 105AMagnecraft Solution Guide 105A
TDR782 Time Delay Relay/DPDT, 4PDT, 3 or 5 Amp Rating
Time Adjustment
Dial
Socket
Compatible
Output Indication
Input Indication
Units
A
A
mA
On = Energized
VAC
VDC
VAC
VDC
VA
VA
VA
W
W
sec
min
hr
%
%
% / °C
ms
(Resistive)
V
°C
°C
grams
TDR782XBX
DPDT
Silver Alloy
5
10
100
Amber
24, 120, 230
12, 24
85% to 115%
90% to 110%
1.7
2.6
3
1.5
1.2
Green
A (On Delay)
7
0.1….1
1….10
0.1….1
1….10
0.1….1
1….10
10….100
5
0.5
0.05
50
100,000
10,000,000
2000 AC
UR, CE, CSA
-40…+70
-20…+60
IP 50
43
Output Characteristics
Number and type of Contacts
Contact Material
Current rating
Maximum permissible current
Minimum Switching Requirement
Indication
Input Characteristics
Standard Voltage
Operating Range
Maximum consumption
Indication
Timing Characteristics
Functions Available
Time Scales
Time Ranges Available
Tolerance
Repeatability
Temperature Drift
Reset Time
Performance Characteristics
Electrical Life
Mechanical Life
Dielectric strength
Environment
Product certifications
Ambient air temperature
around the device
Degree of protection
Weight
< 0.01 s
LED
% of Nominal
% of Nominal
LED
(See page 5/3)
Mechanical Setting
Constant Voltage and
Temperature
Maximum
Operations @ Rated Current
Unpowered
Input to Contacts
Standard version
Storage
Operation
TDR782XDX
4PDT
Silver Alloy
3
10
100
Amber
24, 120, 230
12, 24
85% to 115%
90% to 110%
1.7
2.6
3
1.5
1.2
Green
A (On Delay)
7
0.1….1
1….10
0.1….1
1….10
0.1….1
1….10
10….100
5
0.5
0.05
50
100,000
10,000,000
2000 AC
UR, CE, CSA
-40…+70
-20…+60
IP 50
43
24 AC
120 AC
230 AC
12 DC
24 DC
5/16
Standard Part Numbers
Part Number Builder
129
13 14
1
58
4
1291011
13 14
1
5867
423
3
2
1
45
10
9
8
7
6
14 TERMINAL SQUARE
BASE 4PDT (ON DELAY)
8 TERMINAL SQUARE
BASE DPDT (ON DELAY)
Un R
0.8
(21)
1.0
(27)
Other mating sockets see Section 2: 70-782E14-1, 70-782D14-1,
70-461-1, 70-378-1, 70-379-1
(38)
1.5
(5.6)
0.2
1.1
(27)
3.1
(79)
(85)
3.3
(61)
2.4
0.74
(19)
(89.3)
3.5
A1
INPUT
A2
14 13
12
5
9
11
14
41
8
12
42
41
44
0.14
(3.5)
2.3
(59.4)
1
A1
12
5
9
11
14
INPUT
A2
14
3
4
7
8
11
12
32
42
41 31
34
44
13
2
6
10
22
21
24
NEMA:
IEC:
NEMA:
IEC:
1.1
(27.9)
.83
(21)
1.1
(27.9)
.83
(21)
1.54
(39.1)
2.6
(6.5)
.02
(0.5)
13
5
9
1
14
6
10
2
8
7
11 12
34
8
5
13
9
14
12
14
86
5
13
9
14
10 12
124
1.4
(35.5)
.24
(6.0)
.24
(6.0)
NEMA NEMA NEMA
1.1
(27.9)
.83
(21)
1.1
(27.9)
.83
(21)
1.54
(39.1)
2.6
(6.5)
.02
(0.5)
13
5
9
1
14
6
10
2
8
7
11 12
34
8
5
13
9
14
12
14
86
5
13
9
14
10 12
124
1.4
(35.5)
.24
(6.0)
.24
(6.0)
NEMA NEMA NEMA
16-TDR782SC
Metal Hold-Down Clip
See Section 3 p.8-11
Magnecraft Solution Guide 105A
SECTION 5
Magnecraft Solution Guide 105AMagnecraft Solution Guide 105A
www.magnecraft.com 847-441-2540
Input Voltage
12 VDC
24 VDC
24VAC
110 VAC
230 VAC
12 VDC
24 VDC
24VAC
110 VAC
230 VAC
Timing Range
0.1s to 100h
0.1s to 100h
0.1s to 100h
0.1s to 100h
0.1s to 100h
0.1s to 100h
0.1s to 100h
0.1s to 100h
0.1s to 100h
0.1s to 100h
Functions Available
A (On Delay)
A (On Delay)
A (On Delay)
A (On Delay)
A (On Delay)
A (On Delay)
A (On Delay)
A (On Delay)
A (On Delay)
A (On Delay)
Contact Configuration
DPDT
DPDT
DPDT
DPDT
DPDT
4PDT
4PDT
4PDT
4PDT
4PDT
TDR782XBXA-12D
TDR782XBXA-24D
TDR782XBXA-24A
TDR782XBXA-110A
TDR782XBXA-230A
TDR782XDXA-12D
TDR782XDXA-24D
TDR782XDXA-24A
TDR782XDXA-110A
TDR782XDXA-230A
Rated Load Current
5 Amps
5 Amps
5 Amps
5 Amps
5 Amps
3 Amps
3 Amps
3 Amps
3 Amps
3 Amps
Series
TDR782 = 782 Miniature Timer
Contact Configuration
XBX = DPDT
XDX = 4PDT
Input Voltage
12D = 12 VDC
24D = 24 VDC
24A = 24 VAC
110A = 110 VAC
230A = 230 VAC
Functions
A = ON Delay
–
–
NOTE: Terminal size is 0.105 x 0.020
(2.68 x 0.508)
DPDT 4PDT
70-782EL8-1, 70-782EL14-1
SOCKETS
TDR782XDX TDR782XBX
WIRING DIAGRAMS
Bottom View
TDR782 Relay with the
70-782EL14-1 Socket
BOLD-FACED PART NUMBERS ARE NORMALLY STOCKED
5/17