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5 Amp Series

Control Thermostats

5 Amp – M3, M3(Z), M2, M2F, MQT5S/MQT5S(Z).

• See Technical Information

M3

Applications

Freeze Protection, Medical Applications, Food Warming, Fan Control, Heating Blankets, Thermo-Electric Heaters, LCD Displays

5 amp. Series (AC125V/5A, AC250V/3A, DC12V/5A, DC24V/3A) -10°C~110°C

Each model is available in a double sealed construction.

 

Features:

1) 5 Amp. capacity in a compact body.
2) Long life and small differential thermostat.
3) SPST Contacts
X=NC, Y=NO
Contacts set on rise in temp.

 

Regarding the lead;
AWM1015/AWG20 black 150mm length is the
standard for 75°C or lower

AWM3271/AWG20 gray 150mm length is the
standard for 76°C or higher

 

Features:

1.) 5 Amp. capacity (main contact) as specified in part number.
2.) Back contact capacity: 60% of main contact capacity.
3.) Long life and small differential thermostat.
4.) Main contact lead is black, movable contact is white and back contact is red as standard.
5.) Standard “C” type contact (SPDT)

 

Regarding the lead;
AWM1015/AWG20 black 150mm length is the
standard for 75°C or lower

AWM3271/AWG20 gray 150mm length is the
standard for 76°C or higher

 

Features:

1.) It is a thin 5 Amp. version and has no back contact.
2.) Only D rank DIFF. available.
3.) Other specifications are the same as the M3 Model.

 

Regarding the lead;
AWM1015/AWG20 black 150mm length is the
standard for 75°C or lower

AWM3271/AWG20 gray 150mm length is the
standard for 76°C or higher

 

Features:

1.) A fuse connected in series with the M2 Model to insure safety.
2.) Other specifications are the same as the M2 Model.
3.) For fuse operating temperature, consult us.
4.) Choose a fuse temperature of 25 higher than the thermostat set temperature.

 

Regarding the lead;
AWM1015/AWG20 black 150mm length is the
standard for 75°C or lower

AWM3271/AWG20 gray 150mm length is the
standard for 76°C or higher

 

Features:

1.) While a near complete seal 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 to the lead tip.
2.) Back contact capacity: 60% of main contact capacity.

 

 

Standard lead wires are SVHF, 500mm long.

Ratings and Characteristics:

Tolerance of Setting Temperature and Differential vs. Setting Temperature.

Setting Temp. -10°C~ -1°C 0°C~50°C 51°C~65°C 66°C~75°C 76°C~110°C
Diff \ Cont. Config. 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
C (5°C~8°C) ±4 ±4 ±3 ±3 ±4 ±4 ±5 ±5
D (8°C~12°C) ±4 ±4 ±4 ±4 ±4 ±4 ±5 ±4 ±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 M3/M3Z/5S/5SZ M2/M2F
Diffential rank Current
(unit power factor 1)
Differential rank
Current
(unit power factor 1)
_ DC 48V A 0.1A ~ 0.3A
B 0.1A ~ 0.5A
C 0.1A ~ 0.8A
D 0.1A ~ 0.8A D 0.1A ~ 0.8A
AC250V DC 24V A 0.5A ~ 1.5A
B 0.5A ~ 2A
C 0.5A ~ 3A
D 0.5A ~ 3A D 0.5A ~ 3A
AC 125 V DC 12V A 0.5A ~ 3A
B 0.5A ~ 4A
C 0.5A ~ 5A
D 0.5A ~ 5A D 0.5A ~ 5A
NOTE :
1.“5 Ampere Series” represents the standard maximum current of M3 Model at AC 125V.
2. Maximum current is limited slightly lower for M3 and 5S Models due to heat generated inside the switches.
3. Crossbar contact is not available for the 5 Ampere Series.
4. In the case of DC voltage, spark quenching will be required between contacts depending on the load level.
Maximum operating voltage: AC250V max., DC48V max.
Temperature setting range: -10°C-110°C (tolerance/differential will change at higher temps.)(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
1c (XZ or YZ) for M3(Z) /5S(Z). “C” Contact SPDT
Operating temperature range: -30°C~105°C (standard),-30°C~125°C(special) (no icing, non condensing)(use within 60 degrees 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.
(see the illustration below.) It is recommended that the thermostats be installed to minimize stresses applied along the X axis.

Double Sealed Construction (improvement in water and impact resistance increased)

1. Increased Resistance to Water
Covering a thermostat with a plastic case and sealing its lead wires with a plastic sealant is a
widely accepted approach to achieve a dust-proof and water-resistant structure. Our
thermostats, such as the MQT series in this catalogue, are of this design. Repeated material
expansion and contraction, and internal air pressure changes caused by thermal cycle may
lead to wear of plastic case and sealant, which consequently deteriorates sealing
performance. Our double sealed design, using a vinyl tube, withstands severe environmental conditions for long periods of time.

NOTES: 1.The soft vinyl tube must be taken care of to avoid damage.
2.Do not expose vinyl tube to the direct sunlight.

2. Increased impact resistance
Electrical components such as relays and motors are not very resistant against shocks. Dropping electrical components usually results in damage and subsequent malfunction. Products in the MQT Series are no exception. MQT Series products are fragile to impacts in X direction and more resistive to Y and Z direction impact. However, with the double sealing method using soft vinyl tubes, impact resistance is guaranteed for regular usage.
Impact resistance: 240G

Model designation method