
2 Amp Series
Control Thermostats
2 Amp – MQT8K, MQT8H, MQT8KT, MQT8HT, MQT11H, MQT8H (DS) These thermostats were developed as a small, inexpensive, high performance bimetal thermostat which can be used as a controller. These thermostats use a sharp, semipermanent, snap spring with a flat non-distorting bimetal. Two bimetals are used for increased sensitivity. • See Technical Information
MQT 1
Applications
Freeze Protection, Medical Applications, Food Warming, Fan Control, Heating Blankets, Thermo-Electric Heaters, LCD Displays
2 amp. Series (AC125V/2A, AC250V/1.3A, DC12V/2A, DC24V/1.3A) -10°C~110°C
Each model is available in a double sealed construction.
Features: 1.) Representative model of the 2Amp. series. |
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Regarding the lead; AWM3271/AWG22 gray 150mm length is the |
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Features: 1.) It is suitable for insertion into heater pads, etc. |
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Regarding the lead; AWM3271/AWG22 gray 150mm length is the |
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Features: 1.) MQT8K with a tab terminal. |
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The terminal is #110, Faston |
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Features: The usage is the same as MQT8KT. |
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The terminal is #110, Faston |
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Features: 1.) Cases of MQT8K and 8H are widened and temperature fuse is connected in series inside the case for dual safety. |
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Regarding the lead; AWM3271/AWG22 gray 150mm length is the |
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Features: 1.) While a near complete sealing is achieved by double sealing (DS), moisture intrusion by capillary action at the tip of the lead cannot be avoided. Be careful not to have water splash on the lead tip. |
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Regarding the lead; AWM3271/AWG22 gray 150mm length is the |
Ratings and Characteristics:
Tolerance of Set Temperature and Differential vs. Set Temperature .
Setting Temp. | -10°C~ -1°C | 0°C~50°C | 51°C~59°C | 60°C~65°C | 66°C~75°C | 76°C~110°C | ||||||
Diff \ Cont. Config. | X | Y | X | Y | X | Y | X | Y | X | Y | X | Y |
A (2°C~5°C) | 3± | 3± | ||||||||||
B (3°C~6°C) | ±4 | ±4 | ±3 | ±3 | ±4 | ±4 | ±4 | |||||
C (5°C~8°C) | ±4 | ±4 | ±3 | ±3 | ±4 | ±4 | ±4 | ±5 | ||||
D (8°C~12°C) | ±4 | ±4 | ±4 | ±4 | ±4 | ±4 | ±4 | ±4 | ±5 | ±5 | ±5 | ±5 |
Note: 1. Above list shows the standard tolerance.
2. Special tolerance such as ±1.5 or ±2 will be available.
Table of contact capacity by voltage used and by DIFF. ranking (100,000 cycle life is standard)
Voltage | Current | Standard contact | Crossbar contact (For micro current) | ||
Diffential rank | Current (unit power factor 1) |
Differential rank |
Current
(unit power factor 1) |
||
_ | DC 24V | A | 50mA ~ 0.3A | A | 1mA ~ 100mA |
B | 50mA ~ 0.3A | B | |||
C | 50mA ~ 0.3A | C | |||
D | 50mA ~ 0.6A | D | |||
AC250V | DC 24V | A | 50mA ~ 0.6A | A | 1mA ~ 100mA |
B | 50mA ~ 0.9A | B | |||
C | 50mA ~ 1.3A | C | |||
D | 50mA ~ 1.3A | D | |||
AC 125 V | DC 12V | A | 50mA ~ 1A | A | 1mA ~ 100mA |
B | 50mA ~ 1.5A | B | |||
C | 50mA ~ 2A | C | |||
D | 50mA ~ 2A | D |
Maximum operating voltage: | AC250V max., DC48V max. |
Temperature setting range: | -10°C-110°C (tolerance/differential will change in the higher temp.)(see the above table) |
Differential: | rank A …… 3.5 ± 1.5 (2~5)°C rank B ……4.5 ± 1.5 (3~6)°C rank C ……6.5 ± 1.5 (5~8)°C rank D ……10 ± 2 (8~12)°C |
Contact configuration: | 1b (X) N Closed, or 1a (Y) N Open |
Operating temperature range: | -30°C~85°C (standard),-30°C~125°C(special) (no icing, non condensing)(use within 60° above the set temperature.) |
Insulation resistance: | 100MΩ or more |
Contact resistance: | 70mΩ or less including lead wire resistance) |
Withstanding Voltage: | AC2000V for 2sec. (600V for 1minute between contacts) |
Vibration tolerance: | Selected from JIS·C·0911-1984 Constant vibration; 50Hz fixed/0.2mm fixed (1G) Sweep vibration; 10~55Hz/0.35mm fixed ( 0.1~2.2G) Withstands 2 hours each in directions X, Y and Z. |
Impact resistance: | No damage when dropped three times from the height of 40cm onto a concrete floor (about 70G). No damage for double sealed model when dropped three times from the height of 1m onto a concrete floor (about 240G). Withstands substantial impact after being put in a package or mounted in equipment. |
Life: | 2 million mechanical operations, 100,000 electrical operations at rated load. |
Handling precautions: | The thermostat withstands vibration and impact applied along Y and Z axis, but does not tolerate impact from X direction. It is recommended that the thermostats be installed to minimize stresses applied along the X axis. |
Tab terminal series (improvement in water resistance and impact resistance increased)
A #110 tab comes out from the thermostat main body, and a double pole receptacle is prepared as the corresponding connection.
Because the conventional type with a lead could not adapt itself to lead length cases different from the standard lead length (150mm), we changed it so that the customer can freely select the lead length, which is a big improvement.
*It is expected that the customer will make the connection of the lead, with the length required by the customer, and the female housing.
NOTE: Because No.110 tab · in connector comes in a reel, connection by an automated machine is possible.
Model designation method
