BH-B2D 250V Plastic Casing Normal Closed Open Automatic Reset Temperature Switch Bimetal Thermal Protector

BH Series Thermostat’s Principle and Structure

BH 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 heater, fluorescent ballast, IC etc.

Specification

Contact Capacity :AC250V/6A,AC125V/8A,DC24V/10A,DC12V/10A

Open temperature: 45-150℃

Open temperature tolerance: ±5℃

Case material: Metal Case or Plastic Case

Cable Length: 70 mm or according to customer’s require

Dimension: 1.15 × 6.6 × 3.2

                   2.15 × 7.3 × 3.9

                   3.18×8×4
                   4.21×8×4

Technique Ability

•Appearance Performance: 

There is no burr, crack, distortion and rust on case.

Marks should be correct ,clear and durability.

•Pull Endure Ability of leads with terminal:

Terminals & leads should endure more than 30N axes direction pull lasting for 5 seconds. And terminals should be no loose and leads have no rupture and slipping.

•Action Character

Rated Open Temp: Rated open temperature refer to table below

Curve of Ultimate Trip current VS temperature refers to picture below ( Only for reference )

•Electricity Performance

After thermal protector’s opening the leads should endure AC 660VAC/50Hz with 1Ma leak current lasting for 1 minute. After the trial there is no flashover.

After thermal protector’s opening, the leads and insulation sleeve should endure AC 4000VAC/50Hz with 1Ma leak current lasting for 1 minute. After the trial there is no flashover.

•Insulation performance

Under normal condition, resistance between leads and insulation sleeve should be more than 100M Ω by ohmmeter of DC500V.

•Endurance Capacity

Electric service life: 

The trail condition is under AC220/50Hz with rated load that its power factor is 0.7. Under the trail condition and 2000 cycles, the opening temperature should be in ± 5℃ or ± 5% (the larger is the best choice) of its own rated temperature and there is no melt in product. Under same condition and after 4000 cycles the product should be dependable in its function.

Damp endurance

The thermal protector shall endure constant heat and humidity test (GB2423.3Ca) of grade 48h, after which the insulation resistance shall be no less than 2M Ω . 

Characters

The bimetal with its own small geometrical form is one of the most important parts. There are no other assistant parts in BH series thermal protector. The bimetal is also sensitive to temperature and current, if it is be place in circuitry in series. When it is reach the acting temperature in circuitry, the bimetal will rapidly act then cutting off or connecting the circle.

Type & Configuration

Rated Open Temperature Table

Contact Details:

Andy Wu

Email: andy@tianrui-fuse.com.cn

MP/Whatsapp: +86 13532772961

Wechat: HFeng0805

Skype: andywutechrich

QQ: 969828363