MQT 1

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

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. 2.) Long life and small differential thermostat. 3.) It can be mounted with only one screw. It is most suitable for outside air temperature detection	Regarding the lead; AWM1015/AWG22 black 150mm length is the standard for 75°C or lower AWM3271/AWG22 gray 150mm length is the standard for 76°C or higher
Features: 1.) It is suitable for insertion into heater pads, etc. 2.) The internal structure is the same as MQT8K.	Regarding the lead; AWM1015/AWG22 black 150mm length is the standard for 75°C or lower AWM3271/AWG22 gray 150mm length is the standard for 76°C or higher
Features: 1.) MQT8K with a tab terminal. 2.) Install a lead of your desired length into the receptacle and use it by inserting the thermostat. 3.) We have the receptacle available.	The terminal is #110, Faston
Features: The usage is the same as MQT8KT. The only difference is that it has no mounting hole.	The terminal is #110, Faston
Features: 1.) Cases of MQT8K and 8H are widened and temperature fuse is connected in series inside the case for dual safety. 2.) Standard specifications for the fuse temperature is 76°C/108°C/115°C/133°C/145°C. 3.) As for the fuse temperature, select the one with a temperature 25°C or more higher than the preset temperature of the thermostat.	Regarding the lead; AWM1015/AWG22 black 150mm length is the standard for 75°C or lower AWM3271/AWG22 gray 150mm length is the standard for 76°C or higher
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.	Regarding the lead; AWM1015/AWG22 black 150mm length is the standard for 75°C or lower AWM3271/AWG22 gray 150mm length is the standard for 76°C or higher

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)
Voltage	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.