
Open Frame Thermostats
Heater Protection
These thermostats are specificaly designed for electrical appliances, such as hair dryers, hairdressing equipment, cooking equipment, air heaters. These are factory calibrated bimetals to snap open at a predetermined temperature. Reset is preceeded by significant cooling.
A10, A20, A30, A40
Applications
Household appliances, Electronics, Fan Heaters, Automotive Industry
Benefits
More safety by self hold types, PCB terminals available, Customized ratings, Up to 100,000 cycles
Technical Data (standard types)
ratings | A10V A11V |
A20V A21V |
A30V A31V |
A40V A41V |
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function | automatic | manual | self hold 230 V |
self hold 120 V |
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version | normally closed | |||||
VDE | rated current at 50 / 60 Hz ( power factor 0.95 / 0.6 ) | 16 A / 2.5A (250 V) |
19.2 A / 2.5A (250 V) |
16 A / 2.5A (230 V) |
19.2 A / 2.5A (120 V) |
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switching cycles | 10,000 | 1,000 | 10,000 | 8,000 | ||
temperature range Ta (steps in 5 K) | 70°C … 160°C | 70°C … 130°C / 140°C | 70°C … 160°C | |||
UL | rated current at 50 / 60 Hz ( power factor 1.0 / 0.75 ) | 16 A / 6.3A (250 V) | 16 A / – (125 V) | |||
switching cycles | 6,000 | |||||
temperature range Ta (steps in 5 K) | 70°C … 160°C | |||||
max. current at 250 V 50/60Hz( power factor 0.95 ) | 25 A | |||||
switching cycles under max. current | 200 | |||||
tolerance | standard: +/- 5 K | |||||
feature of automatic action | 1.B, 2.B | 2.B | 2.C | |||
contact resistance | <50 mΩ | |||||
hysteresis / reset temperature 1) | 30 K +/- 15 K / – | – / < -20°C; < -10°C | -/ < -20°C 2) | |||
suitable for use in protection category | I, II | |||||
approvals | VDE / ENEC | EN 60730-1 / -2-9 | ||||
UL | UL 873 | |||||
CSA | C22.2 No. 24 3) | |||||
CQC | GB14536.1-1998 / GB14536.10-1996 4) | |||||
1) at the Ta (upper and lower) limits the hysteresis could deviate 2) without air Åow 3) different power rating 4) details on request |
Terminals
code | used in TCO | illust. | drawing dimensions (mm) |
technical specification |
approvals | |||||
standard | A10, A11, A12, A13 A20, A21, A22, A23 A30, A31, A32, A33 A40, A41, A42, A43 |
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terminals for soldering, screwing, riveting or welding CuNi18Zn20 1) |
VDE,UL, CSA | |||||
A321 | A10, A12 A20, A22 A30, A32 A40, A42 |
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SMD terminals CuNi18Zn20 1) |
VDE, UL | |||||
A322 | A10, A12 A20, A22 A30, A32 A40, A42 |
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THT terminals CuNi18Zn20 1) |
VDE, UL |
1) P types have terminals of CuFe2P material
Standard Types
TCO | illust. | drawing dimensions (mm) |
technical specification |
approvals | ||||||
standard | current-time based 1) |
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A10V | A12V | ![]() |
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base of thermosetting plastic | VDE,UL, CSA | |||||
A11V A21V A31V A41V |
A13V A23V A33V A43V |
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screw-on fixing base of thermosetting plastic |
VDE, UL, CSA | |||||
A20V | A22V | ![]() |
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manual reset base of thermosetting plastic possible srew-on fixing dimensions see above |
VDE, UL, CSA | |||||
A30V A40V |
A32V A42V |
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voltage maintained PTC 120V or 230V base of thermosetting plastic possible screw-on fixing dimensions see above |
VDE, UL, CSA |
1) For current-time based types (execution D, J, K, L, M, P, R, V) the following information must be provided:
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Characteristics of current vs. self heating and current vs. time

Ordering & Marking Example
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