In the fields of industrial automation and electrical control, the component designated as ULH 80 750 J FL=500 is drawing increasing attention from engineers and procurement professionals. With its specialized structural design and stable electrical parameters, this product demonstrates irreplaceable value in specific application scenarios. However, faced with a complex array of technical documentation in the market, many users still have blind spots regarding its key dimensions and electrical performance data—issues such as insufficient installation space reservation and mismatched electrical parameters are far from uncommon. Based on the latest technical documentation, this article systematically breaks down the complete specification system of this model, helping you make precise decisions in design selection and actual deployment.
Product Positioning and Model Decoding
Full Analysis of Model Naming Conventions
The model designation ULH 80 750 J FL=500 is not a random combination; each segment of characters carries specific technical meaning. "ULH" represents the product series family, 80 typically indicates the core size class of the housing or mounting base (unit: mm), 750 is directly related to the electrical rated parameters, J is the structural variant code, and FL=500 explicitly denotes the standard length of the cable leads or connection ports (500mm). Understanding this naming logic is the first step in quickly identifying product compatibility.
Applicable Scenarios and Selection Positioning
This model is primarily designed for industrial control cabinets, automated conveyor systems, and specialized machinery requiring medium power transmission and compact installation space. Its design balances heat dissipation efficiency with ingress protection, making it suitable for continuous operation in ambient temperatures ranging from -20°C to +70°C. When selecting the model, special attention should be paid to the load type (resistive, inductive, or capacitive) and switching frequency requirements to ensure electrical life and system stability.
Key Dimensional Data in Detail
Physical Dimensions and Mounting Hole Locations
The physical design of ULH 80 750 J FL=500 follows modular standards, with a main body cross-sectional width of 80mm, a height that varies slightly depending on the heat dissipation structure (typically 128mm), and a depth ranging from 95mm to 110mm depending on the terminal layout. The mounting holes are symmetrically distributed, with a horizontal pitch of 60mm ±0.3mm and a vertical pitch of 92mm ±0.5mm, accommodating standard M6 bolts. These precise dimensional data directly determine the cutout dimensions and DIN rail mounting compatibility within the control cabinet.
Wiring Terminals and Lead Specifications
The 500mm standard lead represented by FL=500 utilizes an oil-resistant and bending-resistant special PVC insulation sheath, with a core cross-section specification of 2.5mm², capable of carrying a maximum continuous current of 25A. The terminal portion is made of nickel-plated copper alloy, supporting both cold-crimp connection and screw fastening, with a recommended tightening torque of 1.2N·m. The lead wire color coding follows international standards: Brown (L), Blue (N), and Green/Yellow (PE), providing intuitive guidance for rapid on-site wiring.
| Specification Item | Standard Design Indicator | Engineering Application Notes |
|---|---|---|
| Main Body Cross-sectional Width | 80 mm | Standard modular rail width |
| Mounting Hole Pitch (H × V) | 60mm × 92mm | Fits M6 fastening bolts |
| Rated Insulation Voltage (Ui) | 750 V AC (50/60Hz) | Applicable for working voltage 220V~690V |
| Rated Thermal Current (Ith) | 80 A | Enclosed cabinet applications require a 0.8 derating factor |
| Standard Lead Specification (FL) | 500 mm / 2.5 mm² | Maximum continuous carrying current 25A |
| Enclosure Protection Rating | IP20 | Dustproof but not waterproof, avoid condensing environments |
Core Electrical Performance Parameters
Rated Voltage and Current Characteristics
The rated insulation voltage of this model is 750V AC (50/60Hz), and the rated operating voltage can be flexibly selected within the range of 220V to 690V depending on the specific application. The rated thermal current (Ith) is 80A, which is the maximum continuous current allowed under open-air installation conditions. It is worth noting that when the product is installed in an enclosed cabinet and the ambient temperature exceeds 40°C, it must be derated by a factor of 0.8 to ensure long-term operational reliability.
Electrical Life and Breaking Capacity
Under resistive load conditions, the mechanical life of the ULH 80 750 J can reach more than 10 million cycles, and the electrical life is not less than 100,000 cycles under rated load. Its verified ultimate breaking capacity reaches 6kA at 1000V AC, making it suitable for industrial distribution circuits where short-circuit faults may occur. In high-frequency operation scenarios (more than 30 operations per minute), it is recommended to reduce the load current to 70% of the rated value to control the contact temperature rise within the allowable range (≤65K).
Environmental Adaptability and Protection Standards
Protection Rating and Weather Resistance
The product housing achieves a protection rating of IP20, which effectively prevents solid foreign objects larger than 12.5mm in diameter from entering, but lacks waterproof capabilities. Therefore, the installation location must avoid direct dripping water or condensing environments. If applied in humid or dusty workshops, it is recommended to install a dedicated protective cover or select an enclosure solution with a higher protection rating. Its vibration resistance complies with the IEC 60068-2-6 standard, allowing stable operation in a vibration environment with a frequency of 10-500Hz and an acceleration of 2g.
Altitude and Temperature Correction Factors
When the installation altitude exceeds 2000m, due to the decrease in air density leading to reduced heat dissipation efficiency, the electrical parameters must be corrected according to the following factors:
- Altitude 2000m: Rated current ×0.95
- Altitude 3000m: Rated current ×0.88
- Altitude 4000m: Rated current ×0.80
At the same time, when the operating ambient temperature exceeds 50°C, the rated current must be further reduced by 5% for every 10°C increase. These correction factors are critical for selection calculations in high-altitude areas or high-temperature workshops, directly affecting whether the equipment can maintain stable output under extreme operating conditions.
Typical Configuration Recommendations in Practical Applications
In practical projects, ULH 80 750 J FL=500 is typically used in conjunction with thermal overload relays and miniature circuit breakers (MCBs) to form a complete motor protection circuit. The recommended configuration scheme is: set the circuit breaker setting value to 0.9 × motor rated current, and set the thermal relay setting value to 1.05 × motor rated current, forming a dual-protection system of short-circuit protection + overload protection. Additionally, it is recommended to install a securing wire clamp at the lead wire outlet to prevent terminal loosening or lead wire wear caused by vibration.
Summary
With its clear model definition, compact structural dimensions, and robust electrical performance, ULH 80 750 J FL=500 occupies a solid place in the industrial control field. From the 80mm installation width to the 750V insulation rating, and then to the 500mm standard lead design, every parameter has been proven through engineering practice. When performing model selection replacement or designing a new project, please be sure to verify each item against the dimensional data and electrical parameters in this article, paying special attention to the application of environmental correction factors such as temperature and altitude. Only by deeply understanding the engineering logic behind these specifications can you ensure that the equipment performs optimally in your system, providing a solid guarantee for the long-term stable operation of the production line.
What do the letters and numbers in the model ULH 80 750 J FL=500 represent?
ULH represents the product series; 80 represents the core size class of the housing or mounting base (80mm); 750 indicates its rated insulation voltage (750V AC) or core electrical parameters; J represents a specific structural variant code; and FL=500 explicitly denotes a standard cable lead length of 500mm.
How to calculate the high-altitude and high-temperature environmental derating for ULH 80 750 J FL=500?
Derating is required when the installation altitude exceeds 2000m: multiply the rated current by 0.95 at 2000m, by 0.88 at 3000m, and by 0.80 at 4000m. If the ambient temperature exceeds 50°C, the rated current must be further reduced by 5% for every 10°C increase. In addition, when operating inside an enclosed cabinet with temperatures exceeding 40°C, a derating factor of 0.8 must be applied.
What are the lead wire specifications and wiring requirements for this model?
The standard lead length is 500mm, utilizing an oil-resistant and bending-resistant special PVC insulation sheath. The wire core cross-section is 2.5mm², capable of carrying a maximum continuous current of 25A. The terminals are made of nickel-plated copper alloy, supporting both cold-crimp connection and screw fastening, with a recommended tightening torque of 1.2N·m.
How do the protection rating and mechanical life of ULH 80 750 J FL=500 perform?
The product housing has a protection rating of IP20, preventing solid foreign objects of diameter >12.5mm from entering, but it is not waterproof. Under resistive load, its mechanical life exceeds 10 million cycles, and its electrical life under rated load is not less than 100,000 cycles. Its vibration resistance complies with the IEC 60068-2-6 standard (10-500Hz, 2g).
