TB02-BB1D Temperature Controller / TB02-BB8D Thermostat / TB11-BY5D Temperature Controlled Switch
BH Series Thermostat - Principle and Structure
BW & BH series protectors provide protection against over-current and over-temperature conditions. They feature sealed construction, small internal resistance, no noise operation, and automatic reset functionality. When current flows through the temperature and current-sensitive bimetal, the bimetal's status changes in response to over-temperature or over-current conditions, either cutting off or switching on the circuit. BH series protectors offer enhanced safety compared to standard protectors, as they eliminate temperature effect lag under sudden high-current conditions.
BH Series Thermostat - Specifications
| Parameter | Specification |
| Electrical Rating | DC-12V max 12A; DC-24V max 10A; AC-125V max 8A; AC-250V max 16A |
| Open Temperature | (30~150)±5°C; 5°C increments |
| Reset Temperature | 2/3 of action temperature with ±15°C tolerance. Custom reset temperatures available per customer requirements. |
| Life Cycles | 10,000 cycles |
| Dimensions | L15mm × W7.1mm × H3.8mm |
| Lead Wire | #22 3266, end half tripping, 70mm length, or customized per customer requirements |
| UL File No | E487478 |
| CQC Certificate No | CQC16002142880 |
| TUV Certificate No | B160592241002 |
BH Series Thermal Protector - Dimensions
| Model | Case | Length (mm) | Width (mm) | Height (mm) | Voltage & Current | Lead Wire |
| H20 | Plastic | 18.5 | 8 | 4 | DC-12V max 12A; DC-24V max 10A; AC-125V max 8A; AC-250V max 10A | #20 3135, end 5mm half tripping, 70mm length, or customized |
| H21 | Metal | 18.5 | 7.3 | 3.8 | - | - |
| H21 | Metal | 20 | 8 | 4 | AC250V 20A | #16 3135 |
| BH-A1D | Metal | 15 | 6.6 | 3.2 | DC-12V max 12A; DC-24V max 10A; AC-125V max 8A; AC-250V | #20 3135, #22 3266, #22 3135, end 5mm half tripping, 70mm length, or customized |
| BH-B2D | Plastic | 15 | 7.1 | 3.8 | - | - |
| BH-TB02B-B8D | Plastic | 15 | 5.2 | 2.4 | DC-12V max 4A; DC-24V max 3A; AC-125V max 3A; AC-250V max 2A | 3266-AWG24#, 3135-AWG24# or nickel strip, 70mm length or customized |
BH Series Thermostat - Applications and Instructions
BH Series Thermal Protectors are effective and reliable security protection and alarm devices widely used in:
These protectors prevent damage from over-current and over-heating caused by abnormal operating conditions. Enforced types capable of withstanding 3.5MPa pressure are suitable for built-in installation in plastic coated motors.
| Code | Temperature | Code | Temperature |
| 30 | 30℃ | 100 | 100℃ |
| 35 | 35℃ | 105 | 105℃ |
| 40 | 40℃ | 110 | 110℃ |
| 45 | 45℃ | 115 | 115℃ |
| 50 | 50℃ | 120 | 120℃ |
| 55 | 55℃ | 125 | 125℃ |
| 60 | 60℃ | 130 | 130℃ |
| 70 | 70℃ | 135 | 135℃ |
| 75 | 75℃ | 140 | 140℃ |
| 80 | 80℃ | 145 | 145℃ |
| 85 | 85℃ | 150 | 150℃ |
| 90 | 90℃ | | |
H20, H21 Series Thermostat - Principle and Structure
H20 and H21 series universal and enhanced protectors feature large metal casings and are composed of thermal conductive metal casing, bimetallic parts welded with silver alloy contact points, conductive brackets, insulation fixation stands, fixed contact strips, and heat resistance cables. During abnormal operation, when environmental temperature increases to the set value, the bimetallic parts perform quick action, open the contact points, and disconnect the circuit. When the device cools to safe operating temperature, the contact points automatically close and normal operation resumes.
H20, H21 Series Thermal Protector - Specifications
| Parameter | Specification |
| Electrical Rating | DC-12V max 12A; DC-24V max 10A; AC-125V max 8A; AC-250V max 16A |
| Open Temperature | (30~150)±5°C; 5°C increments |
| Reset Temperature | 2/3 of action temperature with ±15°C tolerance. Custom reset temperatures available per customer requirements. |
| Life Cycles | 10,000 cycles |
| Contact Closure Resistance | ≤50mΩ |
| Insulation Resistance | ≥100mΩ |
| Electric Strength | AC1500V/1min free from phenomena of breakdown and flashover |
| UL File No | E487478 |
| CQC Certificate No | CQC16002142880 |
| TUV Certificate No | B160592241002 |
H20, H21 Series Thermal Protector - Applications
H20 and H21 series are applicable to rechargeable batteries, ballasts, massagers, micro motors, transformers, electric tools, heating electric appliances, and instruments.
Certification: This product has UL, CQC, TUV and RoHS certification approval.
