Main parts

1) Ceramic cover plate 2) Stationary silver contact 3)  Spring disc

4) Movable contact 5) Conductive housing 6) Bimetal disc

Construction

Stationary silver contact are riveted with ceramic cover plate. The movable contact are welded to the spring disc, which is in the shape of a cross, and the four feet are connected to the bottom of the housing. The inner hole of the bimetal disc is placed on the spring disc through the movable contact. The current pass through the stationary silver contact to the movable contact, and then connects the conductive housing through spring discs to form a loop.

Main parts

1) Iron cover plate 2) Stationary silver contact 3) Spring disc

4) Movable contact 5) Housing 6) Bimetal disc 7) Insulating paper

Construction

Stationary silver contact are riveted with iron cover plate.; The bimetal disc and spring disc are combined by steps on the movable contact. The current passes through the stationary silver contact to the movable contact, and then connects the housing through the spring disc to form a loop.

Main parts

1) Ceramic cover plate  2) Stationary silver contact  3) Shaft pin 

4) Bimetal disc   5) Spring disc  6) Movable contact  7) Housing

Construction

Stationary silver contact and ceramic covers are riveted together; The movable contact, bimetal disc and spring disc are riveted together by shaft pins. The movable contact is in close contact with the stationary silver contact under the pre-pressure of the spring disc; The current passes through the stationary silver contact and the movable contact to form a loop.

Main parts

1) Insulating paper  2) Conductive housing  3) Bimetal disc 

4) Movable contact  5) Stationary silver contact  6) Base  7) Iron nails

Construction

The stationary silver contact is welded on the base, the movable contact is welded to one end of the bimetal disc, the other end is welded to the housing by iron nails. The movable contact is in close contact with the stationary silver contact under the pre-pressure of the bimetal disc, the base and the housing are isolated by  insulating paper. The current first passes through the movable contacts connected to the housing and bimetal disc,  and then through the stationary silver contacts on the base to form a loop.

Main parts

1) Shell  2) Iron bracket  3) Bimetal disc

4) Movable contact  5) Base  6) Stationary silver contact

Construction

The movable contact are welded to the bimetal sheet and then welded to the iron bracket. The stationary silver contact and base are molded into a whole, and then the base is riveted with the iron bracket. The current first passes through the movable contact on the bimetal disc from the iron bracket, and then passes through the stationary silver contact to form a loop.

Main parts

1) Shell  2) Base  3) Bimetal disc  4) Movable contact

5) Temperature calibration plate  6) Static contacts

Construction

The movable contact are welded to the bimetal sheet and then wel-ded to the iron bracket. The stationary silver contact and base are molded into a whole, after the current passes through the temper-ature calibration plate and the bimetal disc, it forms a loop from the moving contact to the static contact.

ST08 is a protector with double protection function of overcurrent and overtheating, and its built-in heating wire and bimetal form a series circuit. The overload current when the motor is blocked will make the heating wire heat up rapidly, which will heat the bimetal disc and accelerate the heating speed of it, so that the bimetal disc can reach the rated operating temperature faster and bounce open, cutting off the circuit. The heating wire with different resistance values has different heat generation, resulting in different trip times. By adjusting the resistance of the heating wire, it is possible to control the tripping speed of the protector when the current value is fixed.

ST09 thermostat is a double-pole, double-throw, resettable or manual reset ultra-current (up to 250VAC 63A) temperature controller. The plastic structural parts isolate the bimetal disc that senses the temperature and the beryllium copper metal part that passes the current, preventing the thermal effect generated by the current from heating the bimetal disc, causing it to open in advance and improving the accuracy of the protection temperature.

ST10 high-current thermal protector is a high-current protector with overcurrent, overheating double protection function, built-in heating plate and bimetal disc to form a series circuit. The overload current when the motor is blocked will make the heating wire heat up rapidly, which will heat the bimetal disc and accelerate the heating speed of it, so that the bimetal disc can reach the rated operating temperature faster and bounce open, cutting off the circuit.