ST01 A U2 Thermal protector

Power class: 1,6 A to 7,5 A

Type series: ST01 thermal protector

normally closed

resets automatically

with connector cables

without insulation

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ST01 A U2 Thermal protector

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.

Function

When the circuit is normal, the movable contact is in close contact with the stationary silver contact under the pre-pressure of the spring disc. When the rated operating temperature is reached, the bimetal disc is deformed by heat, snaps into its inverted position and pushes the spring disc downwards. The contact is abruptly opened and the temperature rise of the device to be protected is disrupted.

After the circuit is disconnected, the ambient temperature begins to fall. When it reaches the defined reset temperature, the bimetal disc and the spring disc snaps back into its start position, the movable contact and the stationary silver contact will close again, and the circuit returns to the conduction state.

PRODUCT PARAMETER

Nominal switching temperature (NST) in 5°C

60 °C - 250 °C

Tolerance (standard)

(60-200) °C ±5K
(205-250) °C ±10K

Reverse switch temperature (RST) tolerance

≥ 35 °C (≤ 80°C NST)
-30K±15K (≥ 85°C ≤ 180° C NST)
-60K±15K (≥ 185° C ≤ 200° C NST)
120℃±15K(＞200°C NST)

Thickness

4.5mm

Diameter

8.6mm

Resistance to impregnation

suitable

Suitable for installation in protection class

Pressure resistance to the switch housing

200N

Standard connection

0.33 mm² / AWG22

Insulation voltage

The housing is not insulated

Available approvals

UL/TUV/CQC/CB

Operating voltage range AC/DC

up until 500 V AC / 14 V DC

(60-200)°C Operating temperature products

Rated voltage AC

250 V(VDE)
277 V(UL)

Rated current AC cos ϕ = 1.0 /cycles

2.5A / 10,000

Max. switching current AC cos ϕ = 1.0 /cycles

6.3 A / 3,000
7.5 A / 300

Rated current AC cos ϕ = 0.6 /cycles

1.6 A / 10,000

Rated voltage DC

12.0 V

Max. switching current DC /cycles

40.0 A / 5,000

(205-250)°C Operating temperature products

Rated current AC cos ϕ = 1.0 /cycles

2.5A / 1,000

Rated current AC cos ϕ = 0.6 /cycles

1.6 A / 1,000

Total bounce time

< 1 ms

Contact resistance

≤ 50 mΩ

Vibration resistance at 10 ... 60 Hz

100 m/s²

PRODUCT PARAMETER