1
CIRCUIT BREAKERS FOR EQUIPMENT
TM12 Series
• Thermal magnetic release
• Positively trip-free
• Reset or manual
actuation
The TM12 circuit breaker for equipment (CBE) is a single pole, ther-
mal-magnetically operated device providing small size, low cost and
reliable trip-free operation on overloads and short circuits within the
maximum breaking capacity. It is intended primarily for the protection
of circuit control functions in sensitive instruments etc. It is not
generally suitable for line protection unless the prospective short cir-
cuit current is less than 200 A at 240 V a.c. (400 A at 28 V d.c.).
Threaded neck and flange mounting types are available each with
optional push on/push off mechanism, shunt terminal and auxiliary
contact. There is also a choice of screw clamp terminals on certain
types.
The well proven mechanism is designed to open the contacts in the
event of overloads. A bimetal strip is heated by the overcurrent and
deflects, thereby releasing the latch mechanism. If the overcurrent is
sufficiently high, the magnetic release will operate and open the
circuit instantaneously. Two characteristics are available. The more
commonly used T characteristic has operating limits between 8-12
times the rated current. The optional F characteristic operates at a
lower current levels of 4-8 times the rated current.
In case of overloads, the contacts will open even if the reset button is
manually held in the closed position. This is known as a 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 the opening operation, the reset button has to be fully
depressed, then released, to effect a closing of the contact.
It is impossible to «tease» the contacts by gentle pressure on the
reset button.
Available options
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•
•
•
•
•
•
•
Fast and slow magnetic tripping characteristics
Flange type
Threaded neck type
Type of actuation: reset or manual ON/OFF (push/push)
Terminals: quick connect or screw clamp terminals
Independent auxiliary contact (change-over contact)
Shunt terminal
Setting indication on reset button indicates the position
of the contacts
Special features
•
•
•
•
•
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Competitive pricing
Quick connect terminals
Choice of mounting styles
Positively trip-free
Insensitive to shock or vibration
UL, CSA, VDE and other approvals
Schurter, Inc. • Phone 707-778-6311 • Fax 707- 778-6401 • E-mail info@schurterinc.com • Website http://www.schurterinc.com
193
1
CIRCUIT BREAKERS FOR EQUIPMENT TM12
Tripping characteristics
TMF + TMT
[ min ] [ sec ]
10'000
Rated current
60
30
20
10
5
100
1
1'000
Ambient temp..
< 7,0 A
≥
7,0 A
+23
°C
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:
Ambient
temperature [°C]
-5
0
+10
+23
+30
+40
+50
+60
Correction factor
10
0,87
0,90
0,95
1,00
1,05
1,12
1,20
1,30
Tripping time
1
TMF
TMT
0,1
0,01
0,001
0,0001
1 1,32 2
,05
4 5
Multiple of rated current
8 10
20
50
[ x In
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
Technical data
Main circuit
Rated voltage Ue
See approvals, page 195
AC 240 V; DC 28 V
Rated current In
Conditional short circuit current Inc
See approvals, page 195
AC/DC 0,05 – 16 A
EN 60 934
PC1, AC 240 V
1000 A
Short circuit capacity Icn
AC 240 V
AC/DC 28 V
200 A
400 A
Auxiliary circuit
Rated voltage Ue
See approvals, page 195
AC 120 V, 240 V; DC 28 V
Rated current In
Class of protection
See approvals, page 195
Between live and accessible parts
Other parts
1,0; 2,0; 3,0 A
II
I
194
Schurter, Inc. • Phone 707-778-6311 •
•
Fax 707-778-6401 •
•
E-mail info@schurterinc.com •
•
Website http://www.schurterinc.com
Phone 707-778-6311 Fax 707-778-6401 E-mail info@schurterinc.com Website http://www.schurterinc.com
1
CIRCUIT BREAKERS FOR EQUIPMENT TM12
Technical data (continued)
Degree of protection
Accessible range
Termination range
IP40
IP00
Dielectric strength
Accessible 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-magnetic
• Positively trip-free
TM
Weight
approx. 33 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
0,05 – 16 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
0,05 – 16 A
0,05 – 16 A
0,05 – 16 A
0,05 – 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
Schurter, Inc. • Phone 707-778-6311 • Fax 707- 778-6401 • E-mail info@schurterinc.com • Website http://www.schurterinc.com
195
1
CIRCUIT BREAKERS FOR EQUIPMENT TM12
Order code
Basic type
TM Single pole thermal magnetic overload protection switch,
positively trip-free
Magnetic release range**
F
T
Fast
Slow
Mounting style
1
2
Flange type
Threaded neck type M10 x 1, 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
1,3
3,0
8,5
0,2
1,4
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
Other rated currents by request
** The magnetic tripping range is valid for AC. For DC the stated magnetic currents are
approx. 1,6 x higher.
Accessories
TZZ 02
Protective cover for threaded neck mounted front side IP54
T
196
M
F
1
2 –
2
1
1
S
N
R
–
0,15
–
T
Z
Z
0
2
Order example
Phone 707-778-6311 • Fax 707-778-6401 E-mail info@schurterinc.com Website http://www.schurterinc.com
Schurter, Inc. • Phone 707-778-6311 • Fax 707-778-6401 •
•
E-mail info@schurterinc.com •
•
Website http://www.schurterinc.com
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