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BW-A1D Motor thermal protector thermal switch

BW-A1D thermal protector: Snap action, automatic reset
Normal closed type: cutoff at temperature rises;
Normal open type: contacts closed (ON) at termprature rises.
Contact rating: 8A/125VAC; 5A/250VAC; 8A/24VDC
Thermal switch dimension: 15X6.5X3.1mm
Open Temperature: 50C to 155C, in 5C increasement
  • BW-A1D Thermal Protector

  • HC


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Snap action thermal protector , automatic reset type with UL,VDE, CB, CCC , Rohs compliant


Work principle:

BW-A1D thermal protector is a temperature automatic response devide and is connected in series to the winding of motor. The contacts open on temperature rise and reset after the temperature drops down.



A1D series thermal protectors are devices for protecting against overload and over temperature. They are usually used for AC 220v /50Hz one phase motors to protect motor from over temperature caused by unusual state such as overload, blocked up. They are also used for protecting against over temperature & temperature control in lighting appliance, heater, fluorescent ballast, IC etc.

Main Features:

Snap action, normal closed/ mormal open type, auto reset

Normal closed  type: cutoff at temperature rises; Normal open type: contacts closed (ON) at termprature rises.

Contact rating: 10A/125VAC; 5A/250VAC; 10A/24VDC 
Thermal switch dimension: 15X6.5X3.1mm

Open Temperature: 50C to 155C,  in 5C increasement

Tolerance for open temperature: +/-5C

Cable:Stardard:AWG20 silicon cable or AWG#22 UL3326 PE cable, 70mm long, special requests accepted
Approval: UL,VDE, CQC,CB, Rohs compliant


Cutoff temperature table:(reset temperature for reference)

Model Open temperture Reset temperture Model Open temperture Reset temperture
A1D-50℃ 50±5℃ 35±6℃ A1D-105℃ 105±5℃ 70±15℃
A1D-55℃ 55±5℃ 35±7℃ A1D-110℃ 110±5℃ 75±15℃
A1D-60℃ 60±5℃ 40±10℃ A1D-115℃ 115±5℃ 75±15℃
A1D-65℃ 65±5℃ 45±10℃ A1D-120℃ 120±5℃ 80±15℃
A1D-70℃ 70±5℃ 45±10℃ A1D-125℃ 125±5℃ 85±15℃
A1D-75℃ 75±5℃ 50±15℃ A1D-130℃ 130±5℃ 85±15℃
A1D-80℃ 80±5℃ 55±15℃ A1D-135℃ 135±5℃ 90±15℃
A1D-85℃ 85±5℃ 55±15℃ A1D-140℃ 140±5℃ 95±15℃
A1D-90℃ 90±5℃ 60±15℃ A1D-145℃ 145±5℃ 95±15℃
A1D-95℃ 95±5℃ 65±15℃ A1D-150℃ 150±5℃ 100±15℃
A1D-100℃ 100±5℃ 65±15℃ A1D-155℃ 155±5℃ 105±15℃


 with leadwire and with insulation sleeve, the cable and length can be made according to customer's request:

15X6.5X3.1mm with 70mm cable, special requests for the cable acceptable


Ultimate Tripping Current Vs Ambient Temperature ( for reference only)

A-C chart



Product Picture


A1D-01 bimetal thermal protector.jpgA1D-05.jpgA1D-with shrinkable insulation sleeve.jpg


Other models for your reference


HC thermal protector02


Production line

 production line

Packaging & shipping






Storage Condition:

During the transport and storage, the packages can not be exposed to snows or rains, and should avoid strong force outside.  It shouId be stored in a dry and ventilative warehouse.


Customers' special requests accepted. Pls contact us for more.



Product Category

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