SEKI ST-22 KW9700 Snap-Action Thermostat
ST-22 SEKI Thermostat BW9700 Thermal Cut Off Switch
BW & BH series protectors offer reliable protection against over-current and over-temperature conditions. These sealed units feature small internal resistance, silent operation, and automatic reset functionality. The temperature and current-sensitive bimetal components change state to cut off or switch on the circuit when detecting over-temperature or over-current conditions. BH series provides enhanced safety with no temperature effect lag during sudden current surges.
BW-ABS Snap-Action Thermostat Specifications
| Electrical Rating |
DC-12V max 12A; DC-24V max 10A; AC-125V max 8A; AC-250V max 16A |
| Open temperature |
(30~150)±5°C; 5°C a step |
| Reset temperature |
2/3 of the action temperature with tolerance of ±15°C. Custom reset temperatures available. |
| Life times |
10000 cycles |
| Size |
L15mm W7.1mm H3.8mm |
| Lead wire |
#22 3266, end half tripping, length is 70mm (customizable) |
| Certifications |
UL File no: E487478
CQC certificate no: CQC16002142880
TUV certificate no: B160592241002 |
BH Series Thermal Protector Dimensions
| Model |
Case |
Length(mm) |
Width(mm) |
Height(mm) |
Voltage & Current |
Lead wire |
| H20 |
Plastic |
18.5 |
8 |
4 |
DC-12V max 12A; DC-24V max 10A; AC-125V max 8A; AC-250V max 10A |
#20 3135, end 5mm half tripping, length is 70mm (customizable) |
| H21 |
Metal |
18.5 |
7.3 |
3.8 |
Same as H20 |
Same as H20 |
| H21 |
Metal |
20 |
8 |
4 |
AC250V 20A |
#16 3135 |
| BH-A1D |
Metal |
15 |
6.6 |
3.2 |
DC-12V max 12A; DC-24V max 10A; AC-125V max 8A; AC-250V |
#20 3135, #22 3266, #22 3135, end 5mm half tripping, length is 70mm (customizable) |
| BH-B2D |
Plastic |
15 |
7.1 |
3.8 |
Same as BH-A1D |
Same as BH-A1D |
| BH-TB02B-B8D |
Plastic |
15 |
5.2 |
2.4 |
DC-12V max 4A; DC-24V max 3A; AC-125V max 3A; AC-250V max 2A |
3266-AWG24#, 3135-AWG24# or nickel strip normally, length is 70mm (customizable) |
Temperature Code Reference
| Code |
Temperature |
Code |
Temperature |
| 30 |
30℃ |
100 |
100℃ |
| 35 |
35℃ |
105 |
105℃ |
| 40 |
40℃ |
110 |
110℃ |
| 45 |
45℃ |
115 |
115℃ |
| 50 |
50℃ |
120 |
120℃ |
| 55 |
55℃ |
125 |
125℃ |
| 60 |
60℃ |
130 |
130℃ |
| 70 |
70℃ |
135 |
135℃ |
| 75 |
75℃ |
140 |
140℃ |
| 80 |
80℃ |
145 |
145℃ |
| 85 |
85℃ |
150 |
150℃ |
| 90 |
90℃ |
|
|
Applications
BW-ABS snap-action thermostats serve as effective, reliable security protectors and alarm devices. They are widely used in 1.5 horsepower motors, inverter welding machines, switch power supplies, fluorescent lamp ballasts, electric appliances, and other equipment to prevent damage from abnormal over-current and over-heating conditions. Enforced types capable of withstanding 3.5MPa pressure are suitable for plastic-coated motor installations.
H20, H21 Series Principle and Structure
These universal and enhanced protectors feature large metal casings containing thermal conductive metal components, bimetallic parts with silver alloy contact points, conductive brackets, insulation stands, fixed contact strips, and heat-resistant cables. During abnormal operation, rising temperatures trigger the bimetallic components to quickly open the contacts and disconnect the circuit. Automatic reset occurs when temperatures return to safe operating levels.
H20, H21 Series Applications
These protectors are suitable for rechargeable batteries, ballasts, massagers, micro motors, transformers, electric tools, heating appliances, and various instruments.
This product holds UL, CQC, TUV, and RoHS certifications.
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