BH-K-A1D thermal protector, BH-K-A1D thermostat
BH series mini thermal protector’s Principle and structure
BH series that can protect against over-current and over-temperature are sealed firmly, small internal resistance, no noise and reset automatically. When current through bimetal that are sensitive to temperature and current, the status of the bimetal will be changed by over-temperature or over-current to cut off circuit or switch on circuit. BH series are safer than normal protectors, as there is no temperature effect lag under condition of sudden big current.
BH series mini thermal protector’s Application
It is widely applied for all kind of motors, lighting, inverter welder, switch power supply, heating appliance, rechargeable battery pack, transformer, rectifier, portable power tool, water pump, AC motor etc.
BH series mini thermal protector's specification
1. Contact’s type: Normally closed and Normally open
2. Electrical rating:
BH-B2D & BH-A1D: 12A/DC12V;10A/DC24V;8A/AC125V;5A/AC250V
BH-TB02B-B8D:4A/DC12V;3A/DC24V;3A/AC125V;2A/AC250V
3. BH-B2D & BH-A1D Circuit resistance: ≤50mΩ ; BH-TB02B-B8D Circuit resistance: ≤30mΩ
4. Insulation resistance: ≥100mΩ
5. Action temperature range: 35~155℃
6. Case: metal case and plastic case
7. Life: ≥10,000 times
8. Size:
| Model | L(mm) | W(mm) | H(mm) | Electrical rating | Lead wire(mm) |
| BH-B2D | 15±0.3 | 7.3±0.2 | 3.8±0.1 | 12A/DC12V;10A/DC24V;8A/AC125V;5A/AC250V | 3266-AWG#24,3135-AWG#24,or nickel strip normally,length is 70mm,or according to customer’s require |
| BH-A1D | 15±0.3 | 6.6±0.2 | 3.2±0.1 |
| BH-TB02B-B8D | 13.5 | 5.4 | 2.4 | 4A/DC12V;3A/DC24V;3A/AC125V;2A/AC250V |
9. Open temperature and reset temperature sheet
| Code | Open temp. | Reset temp. | Code | Open Temp. | Reset Temp. |
| 030 | 30±3℃ | ≥20℃ | 095 | 95±5℃ | 70±15℃ |
| 035 | 35±3.5℃ | ≥25℃ | 100 | 100±5℃ | 70±15℃ |
| 040 | 40±4℃ | ≥30℃ | 105 | 105±5℃ | 75±15℃ |
| 045 | 45±4.5℃ | ≥33℃ | 110 | 110±5℃ | 75±15℃ |
| 050 | 50±5℃ | ≥35℃ | 115 | 115±5℃ | 80±15℃ |
| 055 | 55±5℃ | 42±6℃ | 120 | 120±5℃ | 85±15℃ |
| 060 | 60±5℃ | 45±8℃ | 125 | 125±5℃ | 85±15℃ |
| 065 | 65±5℃ | 48±10℃ | 130 | 130±5℃ | 90±15℃ |
| 070 | 70±5℃ | 50±12℃ | 135 | 135±5℃ | 95±15℃ |
| 075 | 75±5℃ | 53±14℃ | 140 | 140±5℃ | 100±15℃ |
| 080 | 80±5℃ | 55±15℃ | 145 | 145±5℃ | 100±15℃ |
| 085 | 85±5℃ | 60±15℃ | 150 | 150±5℃ | 105±15℃ |
| 090 | 90±5℃ | 65±15℃ | 155 | 155±5℃ | 110±15℃ |
BH series mini thermal protector’s advantage
1. Small size and installation size
2. Low internal resistance,≤30mΩ
3. Snap type, sensitive to current and temperature and action quickly
4. Endurance life more than 10000 cycles.
5. Prevention again leak if vacuum impregnation process
6. Double protection of over-current & over temperature
7. Replacer of 4mm/6MM form SENSTAT, IP405/505 from ISUZU and other imported products from PEPI
BH series mini thermal protector’s drawing
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