The selection of 3-pole circuit breakers directly affects the safety of power supply and maintenance expenses in industrial distribution, new energy power plants, and building electrical systems. According to global supply chain information and procurement experience of various users, this paper concludes the five basic principles of scientific procurement to help you keep away from selection errors and reduce the failure rate of equipment.
Tip 1: Accurately lock the rated parameters
As a purchaser, you first need to understand your electrical needs and find suitable circuit breakers. The following are the problems encountered
Choosing the rated current, the general technical formula is load current x 1.25. If your actual circuit is 32 amps, then you need to choose a 40 amp model to ensure the safety of the circuit. And not exceeding 80% of the current carrying capacity of the line conductor.
Choose a rated voltage that matches the system’s nominal voltage. If a 400V level circuit breaker is selected for the 380V system
The selection of circuit breaker poles. If it is a TN-C system, it is strictly prohibited to use a 3-pole circuit breaker and a 4-pole circuit breaker needs to be selected. If it is a TN-S system, priority should be given to choosing a 3-pole circuit breaker, which can save a lot of space for use
Secret 2: Dynamic matching of breaking ability
| ApplicationScenario | Recommended Short-Circuit Rating | Technical Description |
|---|---|---|
| General Distribution Cabinet | 25kA | Meets 80% of industrial scene requirements |
| Photovoltaic Inverter Output | 50kA | Requires compatibility with DC currentcomponents and harmonic interference |
| Data Center UPS System | 100kA | Paired with electrical fault protection (AFCl)function |
Secret 3: Deep Verification of Environmental Adaptability
The working condition of a 3-pole circuit breaker directly affects its working performance.
Circuit breakers of different specifications have different adaptability to the ambient temperature and humidity. In general, the working temperature range of a 3-pole circuit breaker is generally -5 ° C to+40 ° C. If the working environment is special, a waterproof, moisture-proof, dustproof, or high-temperature-resistant model must be selected.
On the other hand, the size of the installation space and the wiring method of the distribution cabinet should be considered.
Tip 4: Evaluate brand reputation
When buying 3-pole circuit breakers, choosing products from well-known brands usually ensures their quality and stability.
Major brands have more advantages in technological research and quality inspection, with low product failure rates and long lifespan.
Following,I would like to introduce some well-known circuit breaker manufacturers
ONESTO
Characteristics of Circuit Breakers: Provides a complete range of low and medium-voltage circuit breakers, the products of high reliability and top technology.
Such as the low-voltage miniature circuit breaker series circuit breakers have short-circuit protection, sensitive overload protection, and good adaptability, widely used in the industrial, construction, etc.
Schneider Electric
Characteristics of Circuit Breakers: Schneider Electric’s circuit breakers are known for their intelligence and high efficiency,
ABB
Characteristics of Circuit Breakers: ABB’s circuit breakers are renowned for their advanced electrical protection and energy-saving features.
GE Electric
Circuit breaker features: GE offers a variety of efficient low and medium voltage circuit breakers,
Matsushita Electric Industrial
Characteristics of circuit breakers: Panasonic provides cost-saving and energy-efficient circuit breakers, and the EZC series has high-capacity overload protection, short-circuit protection, and arc resistance characteristics, which are suitable for residential and small commercial buildings.
Tip 5:Consideration of after-sales service
Circuit breakers are key electrical equipment, and once they fail, they can affect the overall system’s performance.
It is therefore essential to choose a manufacturer with good after-sales service. Ensure that suppliers provide immediate technical support and product maintenance services to avoid downtime.
FAQ
How to match the rated current of a 3-pole circuit breaker and the load current?
When choosing a 3-pole circuit breaker, the rated current should be the same as the maximum current of the electrical system load. It is generally recommended to choose a circuit breaker whose rated current is the same as or slightly greater than the load current.
Do I need to use a thermal magnetic or an electronic 3-pole circuit breaker?
Thermal magnetic circuit breakers suit normal environments and loads, and electronic circuit breakers suit cases with higher demand and can provide more accurate current protection. If your electrical system demands high demands, electronic circuit breakers might be better.
Matters the brand when choosing a 3-pole circuit breaker?
Yes, the brand is important. ONESTO brand circuit breakers can provide a better quality product, more stable performance, and more comprehensive after-sales service.
