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A-TB72 FLAT
TIME SWITCHES
A-TB72·72Q
72
2.835
72
2.835
Flush mounting type
75.2
2.961
90
3.543
Part names
Manural switch
• Auto and manual modes are selectable
for control.
Power status indicator: quartz
power-failure compensation type.
Frequency switchable: AC motor types.
Easy-to-read.
Directly read-
able clock.
• Present time is
trimmable every
1 minute.
Setting elements integrated at 15
minute intervals throughout the clock
circumference.
• Load can be turned on and off every 15 minutes
(maximum 48 ON and OFF actions per day),
allowing minute daily time control.
ON settings are colored
on the dial.
• Operation setting times are found
at a glance with red indicator.
Surface mounting type
Features
mm inch
Space-saving.
Depth in the box is less
than 21.7mm .854inch.
(including the panel thickness.)
Quick
mountable.
1. DIN72 size smart time switch
Flush mounting type is as thin as 32mm
1.260inch and depth in the box is less
than 21.7mm .854inch.
2. Easy to read directly readable
clock.
3. Load can be turned on and off
every 15 minutes with the 96 setting
elements.
4. Quartz power-failure compensation
type commonly usable over 100 to
240V AC.
Power supply Load
terminals
terminals
DIN rail mounting possible
Product types omType
t4u.cAC motor type
heeQuartz power-failure compensation type
Rated operating voltage
100V AC
110V AC
120V AC
200V AC
220V AC
240V AC
100 to 240V AC
Flush mounting type
A-TB72-D-HR1A-100V
A-TB72-D-HR1A-110V
A-TB72-D-HR1A-120V
A-TB72-D-HR1A-200V
A-TB72-D-HR1A-220V
A-TB72-D-HR1A-240V
A-TB72-Q-HR1A-ACF
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Surface mounting type
A-TB72-DD-HR1C-100V
A-TB72-DD-HR1C-110V
A-TB72-DD-HR1C-120V
A-TB72-DD-HR1C-200V
A-TB72-DD-HR1C-220V
A-TB72-DD-HR1C-240V
A-TB72-QD-HR1C-ACF


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Specifications
Types
Drive system
Voltage
Rating
Time accuracy
Contact
specifications
Life
Frequency
Power consumption
Circuit
Load
Manual ON/AUTO
Capacity
(Resistive load)
System
Minimum unit
Setting
Ninimum range
No. of setting
Power failure compensation
Clock accuracy
Contact arrangement
Contact type
Mechanical life (contact)
Electrical life (at rated load)
Allowable operating voltage range
Insulation resistance (initial)
Electrical
characteristics
Dielectric strength (initial)
Surge resistance
Noise resistance
Temperature rise
Malfunctional vibration
Mechanical
Destructive vibration
characteristics Malfunctional shock
Destructive shock
Ambient
conditions
Ambient operating temperature
Ambient operating humidity
Weight ( ) denotes Surface mounting type
Note) Protective cover is provided on A-TB72.
AC motor type
Quartz power-failure compensation quartz motor type
100V AC, 110V AC, 120V AC
200V AC, 220V AC, 240V AC
100 to 240V AC
50/60Hz (Switchable)
50/60Hz (Common)
1.5W or less
1W or less
Input/output separate circuit
Manual switch provided
15A 250V AC
Built-in setting element swing type
15-minute intervals
15 minutes
Max. 48 (ON/OFF)
— 200 hours or more (at 25˚C)
Synchronous with power supply frequency
Monthly error: Within ±15 seconds (at 25˚C)
C
Solder/tab common terminal: Flush mounting type, Crimp terminal or bare wires: Surface mounting type
5,000,000 times or more
20,000 times or more (ON/OFF)
85 to 115% of rated voltage
80 to 110% of rated voltage
More than 100Mbetween contacts (at 500V DC megger)
Between charged and uncharged sections: 1,500V AC/1 min.
Between contacts
: 1,000V AC/1 min.
Surge voltage 7,000V (±1.2×50µsec. one time)
Noise simulator 2,000V
Noise simulator 1,000V
60˚C or less (at 25˚C)
16.7Hz (amplitude: 4.0mm) for 1 hour in each vertical, horizontal and lateral direction
5G or more, 4 times in each vertical, horizontal and lateral direction
–10˚
120g 4.23oz (190g 6.70oz)
˚C +14˚F to +122˚F
45 to 85%
100g 3.53oz (170g 6.00oz)
Dimensions
• Flush mounting type
Manual
switch
Quartz power-failure compensation:
Present Dial with built-in Power supply indicator
time setting elements AC motor type: Hz selection
ON-OFF
position
???
???
72 75.2
2.835 2.961
(???)
Time setting Setting element
67
2.638
27.2
5.5 1.071
32
1.260
39.2
1.543
.217
• Surface mounting type
75.2
2.961
(???)
72
2.835
90
3.543
mm inch
(42.5)
(1.673)
90±0.2
3.543±.008
OFF state
ON state
37.5
1.476
44
1.732
65±0.2
2.559±.008
3-M4 screw hole
3-M.157
(or φ 4.2±0.1 hole)
(or φ .165±.004 hole)
Terminal layouts and Wiring diagrams
• Flush mounting type
(1 Form A)
• Surface mounting type
(1 Form C)
S1
S2 L2
L1
NC
COM
S1 S2
NO
Rated operating
voltage
Load
Rated operating
voltage
Load
• Panel cutout dimensions
(Note) 82 3.228
or more
(Note) 82 3.228
or more
Panel thickness: 1.0 to 4.5mm .039 to .177inch
(Note) Minimum pitch for close mounting
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Precautions during usage
1. Output setting
• ON setting: Turn the setting element
inward, and red mark appear around the
dial.
• OFF setting: Turn the setting element
outward, and the above red mark will dis-
appear.
• Turn the setting element sufficiently
until the click action is felt.
2. Clock setting
• Be sure to turn the knob at the clock
center in the arrow direction to set the
clock to the present time. (The dial also
turns together with the clock.) Be sure to
prevent reverse turning.
• do not turn the dial to set the clock.
3. Attachment
• Insert the time switch from the front of
the attachment panel.
(One-touch system: Panel attachment
model)
• Either use 3.8 or M4 wood screws for
attachment, or use DIN rails with a width
of 35 mm (ATA48011). (Direct-attach-
ment model)
4. Contact relay operation if the power
fails
• Contact relays remain closed while the
power is off.
Power off
Time switch setting time
OFF
5. Power failure compensation (ATB75
series)
• An internal nickel cadmium battery is
provided to compensate for power fail-
ures, but the power supply should be left
on as much as possible. Turning the
power supply on and off shortens the
service life of the battery.
• After continuous charging for 48 hours,
the battery provides 200 hours of power
failure compensation. The internal bat-
tery is fully charged, but if the battery
capacitance has dropped because of
natural discharging, or if the battery has
discharged completely, there may be
times when the switch does not operate
immediately when the power is turned
on. If this happens, set the clock to the
proper time after the power has been
back on for three to four hours.
• Nickel cadmium batteries are a valu-
able commodity which can be recharged.
They cannot be replaced, but if being
discarded after use, please make sure
they are recycled if possible.
When discarding the battery, turn off the
power supply to the time switches, and
use radio pliers to disassemble the over-
all connections and remove the battery.
6. Precautions concerning wiring
With panel attachment models, wiring
should be connected by soldering it
directly, or using the #187 flat connecting
probe provided as an accessory.
7. CE marking support
1) EMC directives (89/336/EEC)
The A-TB72 flat time switch conforms to
EMC directives as a stand-alone time
switch.
Applicable standards: EN50081-2,
EN50082-2
2) Low-voltage directives (73/23/EEC)
In order to satisfy VDE0435 Part 2021,
the installation conditions and precau-
tions noted below must be observed.
1. Wiring connections
The power supply applied to the time
switches should be protected by an over-
current protection device that conforms
to EN/IEC standards.
2. Attachment and removal
(1) With panel attachment models, the
time switches are designed for attach-
ment to a panel. The ends of the time
switches should be fitted inside the
panel.
(2) With direct-attachment models, the
time switches are designed to be
installed inside the panel. Do not touch
any component of the time switch, such
as the end section, while power is being
supplied.
(3) When attaching or removing the
switches, check first to make sure no
voltage is being applied to any of the end
sections.
3. Do not use these time switches in
safety circuits. For example, if using the
time switches in heat circuits or similar
circuits, a protective circuit should be
provided on the mechanical side.
8. For other information, please refer to
"Precautions Concerning A-TB Time
Switches (Common)".
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