5A Overheat Protection H21 Series Thermal Cutoff Switch for Battery
packs
Quick Detail:
| Model | H21 |
| Reset Type | Auto Reset |
| Single Pole,Single Throw(SPST) |
| Case Material: | Plastic or Metal |
| Rated Voltage & Current | 250V AC 5A/10A |
| Contact Type | Normally Closed(Open on Rise) or Normally Open(Close on Rise) |
| Operating Temperature Range | 45～150℃ |
| Temperature tolerance | ±5.0℃ |
| Contact Resistance | ≤50mΩ |
| Insulation Resistance | ≥100MΩ |
| Dielectric Strength | ≥1500V |
| Life Cycle | 10,000 Cycles |
| Certificate | CQC,TUV,UL,VDE,ROHS,REACH |
Description:
H21 thermal cutoff switch is using a special shape of double metal
piece without auxiliary mechanism. The status of metal piece has
the fast change is only depended on the self temperature sensing of
the metal piece and the current thermal reaction. It makes the
contact realize the cut off the power automatically and get through
the power. The over heating protection and overload protection will
be raised. H21 thermal overload protector can be applied for
transformers; battery; lighting electrics; cleaning machine; water
pump; electric tools; electric heating pad; and the household
appliances.
Work Principle:
H21 Thermal cutoff switch is using the double metal piece as e
temperature sensing element. When the electrics work normally, the
double piece is at the free status, the contact is at close/break
off position. When the temperature rises to the action temperature,
the double metal piece acts fast by the inside force caused by
heating, open/close the contact, cut off/get through the power, the
temperature protection function is raised. When the temperature
lows to the reset temperature, the contact closes/breaks off
automatically and recovery to normal work status.
Specifications:
1. Dimensional Outline
2. Structural Drawing
| No. | Name | Material | Qty |
| 1 | Case | PBT | 1 |
| 2 | Moveable spring piece | Beryllium bronze | 1 |
| 3 | Bimetallic strip | BR-1 | 1 |
| 4 | Moveable contact | AgNi10/Cu | 1 |
| 5 | Sealing | Epoxy resin | Few |
| 6 | Lead wire | 0.75mm² black silicon wire | 2 |
| 7 | Base | Brass H62 | 1 |
| 8 | Stationary Contact piece | AgNi10/Cu | 1 |
| 9 | Insulation blcok | PBT-VG30 | 1 |
| 10 | Tinning | Tin | Few |
3. Action Temperature Table
| H21 |
|
| Action Temperature | Reset Temperature | Action Temperature | Reset Temperature |
| 40±5℃ | ≥27℃ | 110±5℃ | 73±15℃ |
| 45±5℃ | ≥27℃ | 110±5℃ | 73±15℃ |
| 50±5℃ | ≥30℃ | 115±5℃ | 76±15℃ |
| 55±5℃ | ≥30℃ | 120±5℃ | 80±15℃ |
| 60±5℃ | 40±15℃ | 125±5℃ | 83±15℃ |
| 65±5℃ | 43±15℃ | 130±5℃ | 86±15℃ |
| 70±5℃ | 46±15℃ | 135±5℃ | 90±15℃ |
| 75±5℃ | 50±15℃ | 140±5℃ | 93±15℃ |
| 80±5℃ | 53±15℃ | 145±5℃ | 96±15℃ |
| 85±5℃ | 56±15℃ | 150±5℃ | 100±15℃ |
| 90±5℃ | 60±15℃ | | |
| 95±5℃ | 63±15℃ | | |
| 100±5℃ | 67±15℃ | | |
| 105±5℃ | 70±15℃ | | |
| Remark : |
| Reset Temperature: 2/3 of Action Temperature, tolerance is±15℃ or
customized. |
Applications:
1. HID ballasts
2. Battery packs
3. Fractional Power Motor
4. AC brushless motorand pump
5. DC motor
6. Heating appliance
7. Vacuum cleaner
8. Auto Wiper
Competitive Advantages:
1. Miniature size and expedient installation
2. Various resistances of bimetal available
3. Safe and reliable
5. High sensitivity
4. Low contact resistance
5. Life cycles more than 10,000 times
6. ROHS compliant
6. Wide application
7. Gasketed case suitable for most impregnation processes
8. There are two types of normally closed and normally open can
meet customers' different requirements
9. The length and specifications of lead wire can be customized
10. Substitute SENSATA 7AM,17AM,SEKI St22 series
Tag:
Thermal Cut Out Switch, Resetable Thermal Cutoff Switch,
Temperature Cutoff Switch
