Small Size 250V 10A 110 Deg C H21 Series Thermal Cutoff Switch for
Motor Coils
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 uses high sensitive disk-shaped bimetal strip as the temperature-sensing element. It is composed of bimetal strip, moveable contact, stationary contact piece, fixed base, moveable spring piece, case and temperature
resistance lead wire.The bimetal strip is fixed on the base, which
can maintain the consistency of disconnection and reset temperature
after long-term use. Its' main function is overheating, overload
protection.
Working principle: when the temperature rises to a certain value,
the bimetal strip will instantly jump off and the contact will move
quickly to disconnect the circuit. When the temperature falls to a
certain value, the bimetal strip will be reset and the contact will
return to the original state to achieve the purpose of switching
the circuit. Its light weight, compact design maintains the
lightweight, sealed housing of the whole device, and is resistant
to drying, maintaining the accuracy and high reliability of
disconnection and reset throughout its life.
Product features: H21 theraml cutoff switch is a temperature
control switch developed by imported thermal bimetal, with small
size, rapid action, accurate temperature control and long life
cycle.
Specifications:
1. Dimensional Outline
2. Structural Drawing
| No. | Part Name | Material | Qty |
| 1 | Lead wire | 0.75mm² black silicon wire | 2 |
| 2 | Sealing | Epoxy resin | A few |
| 3 | Insulation blcok | Ceramic | 1 |
| 4 | Moveable contact | AgNi10/Cu | 1 |
| 5 | Moveable spring piece | Beryllium bronze | 1 |
| 6 | Case | Plastic | 1 |
| 7 | Stationary Contact piece | AgNi10/Cu | 1 |
| 8 | Base | Brass H62 | 1 |
| 9 | Bimetal strip | BR-1 | 1 |
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. Coils
2. Fans
3. Blower
4. Ballast
5. Pump
6. Fractional horsepower motors
7. Small power transformers
8. Household appliances
9. Computer communication equipment
10. Air conditioner motors
11. Vacuum cleaners
12. Electric stove
13. Electric heater
14. Soybean milk machine
15. Ballast
16. Electric heating belt
17. Health care equipment
Competitive Advantages:
1. Fast temperature sensing
2. Accurate temperature control
3. Large control current
4. Low contact resistance
5. Safe and reliable
6. Small size, easy to install
7. No arc discharge
8. Long life cylces more than 10,000 times
9. Anti-vacuum dipping process, can be dipped with the motor
10. There are two types of normally closed and normally open can
meet customers' different requirements
11. The length and specifications of lead wire can be customized
12. Substitute SENSATA 7AM,17AM,SEKI St22 series
Tag:
Thermal Protector Switch, Motor Protector, Thermal Cut-out,
Overload Protector, Overheat Protector
