ST07 Thermal protector

Power class: 10A

Type series: ST07

normally closed

resets automatically

with connector cables

transparent PET cap insulation

Download datasheet

Go Back

ST07 Thermal protector

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.

Function

When the circuit works normally, the contact is in a closed state. When the rated operating temperature is reached, the bimetal disc is deformed by heat and snap rapidly, cut off the circuit. After that, the device begins to cool down. When it reaches the defined reset temperature, the bimetal disc and the spring disc snaps back into its start position, the contacts will close again, and the device starts working again.

PRODUCT PARAMETER

Nominal switching temperature (NST) in 5°C

70 °C - 180 °C

Tolerance (standard)

±5K

Reverse switch temperature (RST) tolerance

See datasheet

Thickness

5.1mm

Diameter

10.9mm

Length of the insulation cap

33mm

Resistance to impregnation

suitable

Suitable for installation in protection class

I+ll

Pressure resistance to the switch housing

500N

Standard connection

0.81 mm² / AWG18

Available approvals

UL/VDE/CQC/CB/KC

Operating voltage range AC/DC

up until 500 V AC / 24 V DC

Rated voltage AC

250 V(VDE)
277 V(UL)

Rated current AC cos ϕ = 1.0 /cycles

10A / 10,000

Rated voltage DC

16.0 V

Max. switching current DC /cycles

20 A / 10,000

Insulation voltage

1.5 KV

Contact resistance

≤ 50 mΩ

Vibration resistance at 10 ... 60 Hz

100 m/s²

PRODUCT PARAMETER