Plastic Housing Normal Open Bimetal Thermostat 5A 250V 50C Thermal Protector

1. Application scope of the Normal Open Bimetal Thermostat 5A 250V 50C Thermal Protector

BW Series thermal protector has small, nimble, long life and other characteristics, widely used in a variety of tubular motor, induction cooker, vacuum cleaners, coils, transformers, electric heaters, ballast, electric appliances, fluorescent lamp ballasts, auto motor, IC and general electrical equipment overheating over current double protection.



2. Product Features of the Normal Open Bimetal Thermostat 5A 250V 50C Thermal Protector

BW series thermal protector is to adopt a certain geometry of bimetallic strip, without auxiliary mechanism, only by the bimetallic strip themselves feeling gentle heating current, rapid changes in the state of the bimetallic element, direct drive contact automatic cutting and processing circuit, overheat and overload protection


3. Product dimension of the Normal Open Bimetal Thermostat 5A 250V 50C Thermal Protector


Plastic shell: 3.5mm×7.0mm×15.0mm
Metal shell : 3.8mm×7.4mm×20.0mm


4. Material list of the Normal Open Bimetal Thermostat 5A 250V 50C Thermal Protector

5.Operating temperature of the Normal Open Bimetal Thermostat 5A 250V 50C Thermal Protector

Operating temperature(OFF): 50±5C
Reset Temperature(ON): 30±8C
ON——OFF Error : more than 8C
Temperature characteristics (regular) table(See table below):

5.1 Contact Resistance
Contactor in the closed state, thermal protector the contact resistance between the two touch points should be not greater than 50 m Ω.

5.2 Insulation Resistance
Insulation resistance should be more than 100 m Ω .
5.3 Electric Strength
For thermal protector applied between the following parts of the basic frequency is 50 hz sine wave test voltage (RMS), lasted 1 s shall be no flashover or breakdown phenomenon
In the condition of thermal breaking contact, between the lead wire: 500V
In contact normally closed conditions, between lead and shell surface of the insulating layer: 1500V
5.4 Moisture-proof
Place it in the ambient temperature is 25 C, relative humidity is 95% for 10 hours later, meet requirements 6.4 and 6.5, and no abnormal change in appearance structure.
5.5 Heat Cycling
Place at 20 C and + 90 C temperature every 2 hours , cycle over 10 times, comply with requirement 6.4, 6.5, and no abnormal change in appearance structure.
5.6 Heat Resistance
Placed 10 hours later in 140 C temperature, meet requirements 6.4 and 6.5, no abnormal change in structure and appearance.
5.7 Cold endurance
Placed in - 20 C temperature for over 10 hours, satisfies requirement 6.4 and 6.5, no abnormal change in structure and appearance.
Action the change in temperature is less than 5 C
5.8 Repeated opening and closing the durability
In room temperature, connected to AC 50HZ&220V&power factor COS∮ = 0.7 under the condition of rated load test after 2000 times, rated operating temperature should be within + / - 5 C of initial value, and contact no welding, after 8000 times thermal protector should still can continue to work.

5.9 Viratility
Vibration frequency 50HZ,amplitude 0.35 mm,last 90S of fixed frequency test,test after the rated breaking temperature shall satisfy the requirements of 6.2.
5.10 Drop impact resistance
Any coagulation from 1200 mm height fell to the ground after 3 times, its appearance structure without changes.
Operating temperature is within 5C