Principle and Structure
BW series thermal protector utilizes a geometrically designed
bimetallic strip that operates without auxiliary mechanisms. The
bimetallic strip directly senses heating current and rapidly
changes state to automatically cut the circuit, providing both
overheating and overload protection.
Applications
Widely applied in electric motors and electrical equipment
including: electric blankets, hot walls, washer motors, soybean
milk machine motors, fan motors, air conditioner motors, fractional
motors, DC motors, AC brushless motors, water pumps, transformers,
rectifiers, lighting, rechargeable batteries, and electric heating
appliances.
Specifications
- Contact Type: Normally closed and Normally open
- Electrical Rating: 10A/AC120V; 8A/AC250V; 10A/AC250V; 16A/AC250V
- Circuit Resistance: ≤50mΩ (Initial value)
- Insulation Resistance: ≥100mΩ
- Action Temperature Range: 40~150℃
- Case: Metal case and plastic case
- Life: ≥10,000 times
| Model | L(mm) | W(mm) | H(mm) | Electrical Rating | Lead Wire (mm) |
|---|
| BW metal | 20 | 7.5 | 3.8 | 5A/250V;10A/250V | AWG#22,AWG#18 high temperature silicone wire L1=L2=70mm, or
according to customer's requirement |
| BW metal | 20 | 8.0 | 4.1 | 16A/250V | AWG#22,AWG#18 high temperature silicone wire L1=L2=70mm, or
according to customer's requirement |
| BW plastic | 20 | 8.0 | 4.0 | 5A/250V;10A/250V | AWG#22,AWG#18 high temperature silicone wire L1=L2=70mm, or
according to customer's requirement |
Open Temperature and Reset Temperature
| Code | Open Temp. | Reset Temp. | Code | Open Temp. | Reset Temp. |
|---|
| 40 | 40℃±5℃ | ≥30℃ | 100 | 100℃±5℃ | 70±10℃ |
| 45 | 45℃±5℃ | ≥30℃ | 105 | 105℃±5℃ | 70±12℃ |
| 50 | 50℃±5℃ | ≥30℃ | 110 | 110℃±5℃ | 75±12℃ |
| 55 | 55℃±5℃ | ≥30℃ | 115 | 115℃±5℃ | 80±12℃ |
| 60 | 60℃±5℃ | 40±10℃ | 120 | 120℃±5℃ | 85±12℃ |
| 65 | 65℃±5℃ | 45±10℃ | 125 | 125℃±5℃ | 90±12℃ |
| 70 | 70℃±5℃ | 50±10℃ | 130 | 130℃±5℃ | 95±12℃ |
| 75 | 75℃±5℃ | 55±10℃ | 135 | 135℃±5℃ | 100±12℃ |
| 80 | 80℃±5℃ | 60±10℃ | 140 | 140℃±5℃ | 105±12℃ |
| 85 | 85℃±5℃ | 65±10℃ | 145 | 145℃±5℃ | 110±12℃ |
| 90 | 90℃±5℃ | 70±10℃ | 150 | 150℃±5℃ | 115±12℃ |
| 95 | 95℃±5℃ | 75±10℃ | | | |
BW Series Technical Drawings
