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Saftty - Model ST11 Series -Thermal Protector
The first China-made round shape thermal protector got UL, TUV and CQC certifications and broke 30 years’ monopoly of German protectors. Thermal protection ST01 is in a well-sealed design,which can prevent product failure from the vacuum impregnation process.
Thermal protection switch is Small in size and suitable to be embedded inside the coil of electric motors. motor thermal overload switch with a metal casecan bear up to 50KG coil shaping pressure, which has high thermal conductivity and temperature sensitivity. Pure temperature action type products, bimetal-disc without current and heat effect, accurate temperature control.
Applications:
- Electric motors
- Transformers
- Coils
- Electronics, sensor
Integration of Resources:
Integrating global supply chain resources, we purchase bimetal discs from EMS, the world’s largest manufacturer of bimetal disc materials, and purchase cases from German suppliers that use stamping and forming technology.
- The spring material comes from Japan NGK and is manufactured by a Japanese stamping supplier.
- The case and spring adopt silver plating technology, which greatly reduces the contact resistance.
- The key components of the bimetallic disareproduced by fully automatic forming equipment, separated by tunnel furnace separation equipment, with good consistency and stable performance.
Advantages:
- Contact: Silver-nickel alloy, with long lifetime, over-current capability
- Spring: Beryllium copper imported from Japan, with good elasticity
- Case: Metal case, better thermal conduction, precision control within 0.02mm, the thickness of silver plated on the surface up to 3um
Technical Data
Normally closed/Normally open
Nominal switching temperature, in 5K-step(TK): 60~250°C
Tolerance-Standard: ±5K/±8K/±10K
Reset temperature range: -35K±15K
Max.operating voltage: 500VAC/14VDC
Working current: 250VAC,2.5A
Cycles at 250VAC/2.5A cosφ1.0: 10000
Cycles at 250VAC/6.3A cosφ1.0: 3000
Cycles at 250VAC/7.5A cosφ1.0: 300
Cycles at 250VAC/1.6A cosφ0.6: 10000
Contact resistance(lead length 55mm): <50mΩ
Insulation voltage: 2KV
Insulation sleeve length “a”: 15mm
Diameter “d”: 9.5mm
Height “h”: 4.3mm
Lead wire-electric: UL3398 AWG22 White (300V 150°C)
Lead wire-teflon: UL10362 AWG22 Yellow (600V 250°C)
Outgoing line length-standard
(The drawing as below): L1=L4=520±10mm
L2=L3=200±5mm