ST-22 SEKI Thermal Protector Temperature Switch with Normally Closed or Normally Open Auto Reset or Manual Reset and Over-Current Protection
The BW & BH series thermal protectors provide 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 bimetallic components change state to cut off or restore circuit connection in response to abnormal conditions.
| 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 times |
| Size | L15mm W7.1mm H3.8mm |
| Lead wire | #22 3266, end half tripping, length is 70mm (customizable) |
| UL File no | E487478 |
| CQC certificate no | CQC16002142880 |
| TUV certificate no | B160592241002 |
| 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 | ||
| 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 | ||
| 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) |
BH series thermal protectors serve as effective security devices for:
- 1.5 horsepower motors
- Lighting devices
- Inverter welding machines
- Switch power supplies
- Rechargeable battery packs
- Fluorescent lamp ballasts
- Portable power tools
- Various electric appliances
Enforced types (3.5MPa pressure rating) are suitable for plastic-coated motor installations.
| 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℃ |
Universal and enhanced protectors with large metal casing composed of:
- Thermal conductive metal casing
- Bimetallic parts with silver alloy contact points
- Conductive bracket and insulation fixation stand
- Fixed contact strip and heat resistance cable
Automatically disconnects circuit at set temperature and reconnects when cooled to safe operating temperature.
Ideal for use in:
- Rechargeable batteries
- Ballasts
- Massagers
- Micro motors
- Transformers
- Electric tools
- Heat electric appliances
- Various instruments
Certifications: UL, CQC, TUV, and RoHS compliant
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