1
CIRCUIT BREAKERS FOR EQUIPMENT
T12 Series
•
Thermal release
• Positively trip-free
• Reset or manual
actuation
A circuit breaker for equipment (CBE) of the T12 series is a single
pole, thermally operated device providing small size, low cost and
reliable trip-free operation on overloads and short circuits, up to the
maximum breaking capacity. It is intended primarily for protection
of motors, transformers, solenoids etc. against damage due to over-
current conditions.
The well proven mechanism is designed to open the contacts in the
event of a current flow in excess of the time/current characteristic of
the device. A bimetal strip is heated by the overcurrent and deflects,
thereby releasing the latch mechanism. The contacts will open even
if the reset button is manually held in the closed position. This is
known as the positively trip-free feature. The contacts open and
close with a snap action and the tripped state is clearly shown by the
increased projection of the reset button. After operation, the
mechanism will not latch closed until the manual reset button is fully
depressed and then released. It is impossible to ‘tease’ the contacts
by gentle pressure on the reset button.
The time which can elapse in case of an overcurrent is given by
the tripping characteristic (tripping zone). This curve is valid for a
device operating at an ambient temperature of +23°C, without
any preloading.
Available options
•
•
•
•
Flange type
Threaded neck type
Type of actuation: reset or manual ON/OFF (push/push)
Terminals:
– quick connect terminals
– screw clamp terminals
• Independent auxiliary contact (change-over contact)
• Shunt terminal
• Setting indication on the reset button indicates the position
of the contacts
Special features
•
•
•
•
•
•
Competitive pricing
Quick connect terminals
Choice of mounting styles
Positively trip-free
Not affected by shock or vibration
UL, CSA, VDE and other approvals
186
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1
CIRCUIT BREAKERS FOR EQUIPMENT T12
Tripping characteristics
Effect of ambient
temperature
The unit is calibrated for an ambient tem-
perature of +23°C. To determine the rated
current for a lower or higher ambient
temperature, use a correction factor from
the table below:
[ min ] [ sec ]
10'000
Rated current
< 7,0 A
60
30
20
10
2`000
1`00
500
Ambient temp.
≥
7,0 A
+23
°C
Ambient
temperature [°C]
-5
0
+10
+23
+30
+40
+50
+60
Correction factor
5
200
0,87
1
100
50
0,90
0,95
1,00
1,05
1,12
1,20
1,30
Tripping time
20
10
5
2
1
0,5
0,3
0,2
0,1
1,05 1,32
2
3
4
5
8
10
Example
Rated current at +23°C
Ambient temperature
Correction factor
Chosen rated current at
+50°C ambient temperature
5,0 A x 1,2 = 6,0 A
5,0 A
+50°C
1,2
Multiple of rated current
[ x In
Technical data
Main circuit
Rated voltage Ue
See approvals, page 188
AC 240 V; DC 28 V
Rated current In
Conditional short circuit current Inc
See approvals, page 188
AC/DC 0,05 – 16 A
EN 60 934
PC1, AC 240 V
1000 A
Short circuit capacity Icn
AC 240 V with In <7 A
AC 240 V with In
≥7
A
AC/DC 28 V
8 x In
200 A
400 A
Auxiliary circuit
Rated voltage Ue
See approvals, page 188
AC 120 V, 240 V; DC 28 V
Rated current In
Class of protection
See approvals, page 188
1,0; 2,0; 3,0 A
• Between live parts and accessible parts
• Other parts
II
I
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187
1
CIRCUIT BREAKERS FOR EQUIPMENT T12
Technical data (continued)
Degree of protection
Accessible range
Termination range
IP40
IP00
Dielectric strength
Operating range
AC 4000 V
Insulation resistance
DC 500 V
>100 MΩ
Endurance
Number of cycles at 6 x I n (AC)
Number of cycles at I n
R-type
S-type
40
5000
Permissible ambient temperature
-5°C to +60°C
Vibration resistance
IEC 68-2-6, Test Fc,
1 mm amplitude 5-60 Hz, 60-500 Hz
10 g
Shock resistance
IEC 68-2-6, Test Ea
100 g
Type of actuation
• Reset type
• Manual ON/OFF (push/push)
R
S
Type of tripping
• Thermal
• Positively trip-free
TO
Weight
approx. 23 g
Approvals
Main circuit
Rated
current range
Rated
voltage AC
Rated
voltage DC
Auxiliary circuit
Rated
current
Rated
voltage AC
Rated
voltage DC
UL
1077
0,3 – 15 A
240 V
28 V
3A
2A
120 V
240 V
240 V
240 V
240 V
240 V
240 V
28 V
CSA
VDE
SEMKO
NEMKO
DEMKO
SEV
C 22,2
EN 60934
0,3 – 16 A
0,05 – 16 A
0,3 – 12 A
0,1 – 16 A
0,05 – 16 A
240 V
240 V
240 V
240 V
240 V
240 V
28 V
28 V
1A
1A
1A
1A
1A
28 V
EN 60934
0,05 – 16 A
28 V
1A
28 V
188
Schurter, Inc. • Phone 707-778-6311 • Fax 707-778-6401 • E-mail info@schurterinc.com • Website http://www.schurterinc.com
1
CIRCUIT BREAKERS FOR EQUIPMENT T12
Order code
Basic type
T12 Single pole thermal overload protection switch, positively trip-free
Mounting style
1
2
Flange type
Threaded neck type 3/8 – 27 UNS – 2 A
with hexagonal- and knurled nut
Actuation type
1
2
Reset type
Manual ON/OFF (push/push)
Terminal type
1
2
6,3 x 0,8 mm quick connect terminals DIN 46244-A
Screw clamp terminals*
* Not available with S-auxiliary contact or N-shunt terminal
Construction variants *
S
N
R
Auxiliary contact
Shunt terminal only for rated currents <7 A
Setting indication on reset button
* (S; N; R; SN; SR; NR; SNR)
Rated current
0,05
1,1
2,5
7,5
0,1
1,2
2,8
8,0
0,15 0,2
1,3
1,4
3,0
8,5
3,3
9,0
0,3
1,5
3,5
9,5
0,4
1,6
4,0
10
0,5
1,7
4,5
11
0,6
1,8
5,0
12
0,7
1,9
5,5
13
0,8
2,0
6,0
14
0,9
2,1
6,5
15
1,0
2,3
7,0
16
See approvals, page 188
Other rated currents by request
Accessories
TZZ 01 Protective cover for threaded neck mounted front side IP54
TZZ 06 Protective cover for rear side IP41
T
1
2
–
2
1
1
S
N
R
–
0,15
–
T
Z
Z
0
1
Order example
Schurter, Inc. • Phone 707-778-6311 • Fax 707- 778-6401 • E-mail info@schurterinc.com • Website http://www.schurterinc.com
189
1
CIRCUIT BREAKERS FOR EQUIPMENT T12
Threaded neck type
T12–211
T12–211SN
4
6
5
Maximum torque 1,5 Nm
OFF
ON
OFF
ON
3/8-27UNS-2A
Ø 5.7
8.8
3/8-27UNS-2A
Ø 5.7
Maximum torque 1,5 Nm
8.8
18
14.7
10
18
14.7
Label
48.5
–0.2
+0.5
10
Label
57.5
+0.5
48.5
–0.2
57.5
A 6.3
1
2
2
2
1
3
2
24.6
31
±0.2
SW
14
11.5
2.5
20.2
24.6
31
±0.2
SW
14
14.5
T12–212
14.5
Maximum torque 1,5 Nm
OFF /
ON
3/8-27UNS-2A
Ø 5.7
8.8
16
18
14.7
10
16
Cut-out
Label
48.5
–0.2
+0.5
Ø
9.
6
8.9
1
8.1
2
M4
31
±0.2
SW
11.5
14
190
Schurter, Inc. • Phone 707-778-6311 • Fax 707-778-6401 • E-mail info@schurterinc.com • Website http://www.schurterinc.com
14.5
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