Auto Reset Thermal Fuse Bimetallic Thermostat with 0-250℃ Temperature Range 100000 Cycles Life Cycle Normally Closed or Normally Open
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 bimetallic components respond to temperature and current changes, cutting off or restoring the circuit as needed.
| 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 |
| 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 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 70mm (customizable) |
| 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℃ |
BH series thermal protectors are effective security devices used in:
- 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 withstand up to 3.5MPa pressure for plastic-coated motor installation.
BW series universal and enhanced protectors feature large metal casings containing bimetallic components with silver alloy contact points. When temperature reaches the set value, the bimetallic components quickly open the circuit, automatically resetting when cooled to safe operating temperatures.
- Switch type: Normally closed or normally opened
- Operating Voltage/Current: AC250V/5A; AC125V/8A
- Operating Temperature: 40~150℃ (5°C increments)
- Tolerance: ±3°C, ±5°C, or ±7°C
- Reset temperature: 15-45°C below operating temperature
- Contact resistance: ≤50mΩ
- Insulation resistance: ≥100mΩ
- Electric strength: AC1500V/1min (no breakdown or flashover)
- Service life: 10000 cycles
| Model | Length (mm) | Width (mm) | Height (mm) |
|---|---|---|---|
| BW9700 | 20 | 7.3 | 3.8 |
BW series protectors are suitable for:
- Rechargeable batteries
- Ballasts
- Massagers
- Motors
- Transformers
- Electric tools
- Heating appliances
- Various instruments
| Code | Open Temperature | Reset Temperature | Code | Open Temperature | Reset Temperature |
|---|---|---|---|---|---|
| 045 | 45±4.5℃ | ≥33℃ | 105 | 105±5℃ | 75±15℃ |
| 050 | 50±5℃ | ≥35℃ | 110 | 110±5℃ | 75±15℃ |
| 055 | 55±5℃ | 42±6℃ | 115 | 115±5℃ | 80±15℃ |
| 060 | 60±5℃ | 45±8℃ | 120 | 120±5℃ | 85±15℃ |
| 065 | 65±5℃ | 48±10℃ | 125 | 125±5℃ | 85±15℃ |
| 070 | 70±5℃ | 50±12℃ | 130 | 130±5℃ | 90±15℃ |
| 075 | 75±5℃ | 53±14℃ | 135 | 135±5℃ | 95±15℃ |
| 080 | 80±5℃ | 55±15℃ | 140 | 140±5℃ | 100±15℃ |
| 085 | 85±5℃ | 60±15℃ | 145 | 145±5℃ | 100±15℃ |
| 090 | 90±5℃ | 65±15℃ | 150 | 150±5℃ | 105±15℃ |
| 095 | 95±5℃ | 70±15℃ | 155 | 155±5℃ | 110±15℃ |
| 100 | 100±5℃ | 70±15℃ |
Certifications: UL, CQC, VDE, and RoHS compliant.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.