Та зөв MCB эсвэл RCBO-г хэрхэн сонгох вэ?

The MCB and RCBO devices are electrical protection devices used to protect downstream cables. Their selection should be based on the requirements of the wiring system. 

Type B circuit breakers are appropriate for domestic appliances and may also be appropriate for light commercial applications. Type C and D are designed for industrial applications and will withstand high inrush currents. To ensure proper protection, the MCB and RCBO must meet all safety standards and must be installed according to manufacturer recommendations.

Choosing the right device for an installation is important. MCBs are designed to provide protection against overcurrent, short circuit, and earth leakage, while RCBOs provide protection against both overcurrent and earth faults. The two devices work differently, so it is important to know how to choose the correct one. 

If you want to buy an MCB or RCBO, we can help you. Follow this guide to select the right MCB or RCBO. 

What Is A Miniature Circuit Breaker?

The MCB is one of the smallest types of the electrical breaker. This type of breaker is used in small electrical systems and for homes. It is small and easy to install. Most miniature circuit breakers use a combination of thermal and magnetic tripping mechanisms. 

This design allows the MCB to identify overcurrent faults more quickly. The breaker will shut off the power within 2.5 milliseconds, but this will depend on the size and number of fittings.

The breaker operates through the thermal or magnetic trip. The thermal breaker has a bimetal strip surrounding it and a composite magnetic system with a spring-loaded buffer and a magnetic spring plug. The bimetal strip contains heater coils that generate heat based on the current flow. When these two circuit breakers are in operation, it will cause a flashback in electricity and cause a circuit to shut down.

What Is RCBO?

RCBO is short for residual current breaker. This circuit breaker is a combination of MCB and RCCB. Unlike MCBs, RCBOs provide protection against overload, short circuits, and earth leakage currents. They sense faults and break the circuit if the flow of current exceeds a certain level. MCBs and RCBOs are often used together.

RCBOs are used in commercial and industrial applications to protect against overcurrent and earth faults. RCBOs does not work on DC circuits, as they are designed for alternating current (AC) circuits. Single-pole RCBOs are sufficient for household uses.

An RCBO is a circuit breaker that protects against overload and short-circuits. It is a combination of MCB and RCCB. Both of these devices have arc chutes and are designed to ensure efficiency and safety. As such, RCBOs are widely used in commercial and industrial applications. Unlike MCBs, RCBOs protect against both overload and short-circuit currents.

RCBOs are also known as the residual current device. Their function is to protect against electrical shocks and fires. They are associated with MCBs in power distribution systems. They protect against short circuits and cable overload, which is the most common electrical hazard. 

Та зөв MCB эсвэл RCBO-г хэрхэн сонгох вэ?

Ихэнх тохиолдолд таны сонгосон MCB эсвэл RCBO нь тэдгээрийн зохицуулж буй гүйдлээр үнэлэгдэх ёстой. Та мөн тэдний аяллын шинж чанарыг шалгаж, нэмэлт функцууд болон аюулгүй байдлын зөвшөөрлийг хайж олох хэрэгтэй. Таны цахилгаан суурилуулалт өвөрмөц тул зөв MCB эсвэл RCBO нь маш чухал юм. MCB эсвэл RCBO сонгохдоо эдгээр хүчин зүйлсийг анхаарч үзээрэй.

• Хэт гүйдлийн шинж чанар

B, C эсвэл D төрлийн MCB эсвэл RCBO-ийн хэт гүйдлийн шинж чанарыг төхөөрөмжүүдийн ажиллах хугацаагаар тодорхойлно. Бодит нөхцөл байдалд таслагчийг боломжийн хугацаанд таслахыг баталгаажуулах нь чухал юм. Жишээлбэл, MCB нь нэрлэсэн гүйдлээсээ хоёр дахин их дөчин секундын дотор зогсох боломжтой. Энэ нь богино хугацааны өсөлтийг бий болгож, төхөөрөмжийг гэмтээхээс сэргийлнэ.

RCBO нь хэмжээсийг өөрчлөх боломжтой таслуур юм. Үүнийг гэрэлтүүлгийн хэлхээг хамгаалахад ашиглаж болох бөгөөд цахилгаан цочролоос хамгаалах үйлчилгээ үзүүлдэг. Үүний гол зорилго нь ус халаагчийн цахилгааны урсгалыг тасалдуулах явдал юм. MCB эсвэл RCBO нь шугамын гүйдлийн урсгалыг хянаж, богино холболт, хэт ачаалал, газардуулга алдагдсан үед хэлхээг тасалдаг төхөөрөмж юм. Эдгээр төхөөрөмжүүд нь хэт гүйдэлээс хамгаалахын тулд түгээлтийн самбарт ашиглагддаг.

RCBO эсвэл MCB нь хэт гүйдлийг илрүүлэх замаар цахилгаан цочрол, галаас хамгаалах боломжтой. MCB нь RCCB-ээс илүү аюулгүй хувилбар бөгөөд гэрт ашиглах боломжтой. Эдгээр нь хэлхээний тусгаарлалтыг хангадаг боловч RCB-ээс бага бат бөх байдаг. RCBO нь ерөнхийдөө цахилгааныг богино хугацаанд таслах зориулалттай бөгөөд ашиглахад илүү аюулгүй байдаг. 

• Үндсэн програмууд

A manual circuit breaker (MCB) is an electrical device that trips in an overload or short circuit situation. It causes an interruption of the load circuit when it trips. The operating knob moved to the off position when the MCB tripped. There are several types of MCBs, with short circuit breaking capacities. You need to consider the basic applications of Type B, C or D devices. Type B devices are used for domestic applications. You can use Type C for commercial and industrial applications. As for Type D, you can use it in industries where the inrush current is high.

• MCB-ийн бүдрэх шинж чанар

MCBs have two basic types of trips, the thermal and the magnetic. The thermal trip is more likely to trip during an intense overcurrent. The magnetic trip interrupts the short circuit when it reaches an ampacity that is too high for the circuit. Tripping characteristics of MCBs are illustrated graphically in a trip curve chart. The thermal region represents the bi-metal tripping unit, and it gradually slopes downwards as a result of a gradual overload. The B-type MCB has a tripping range of 3 to 5 times the rated current. A D curve tripping characteristic is four seconds slower than a K curve. This gives the circuit more time to ride through high in-rush at start-up. The C-type tripping time is approximately 5 to 10 times. The D curve has a tripping range of 10 to 20 times the rated current.

• Хүсээгүй бүдрэх

MCB эсвэл RCBO сонгохдоо мэдэх ёстой хамгийн чухал зүйл бол алдааг хэрхэн олж засварлах явдал юм. Мөн та хүсээгүй гацахаас зайлсхийхийн тулд төхөөрөмжийг худалдаж авахаасаа өмнө аюулгүй байдлын үнэлгээг шалгаж болно.

Both types of MCBs and RCBOs can trip a circuit when an overcurrent occurs. However, an RCBO may not trip an overcurrent if it detects a low voltage or an overcurrent condition. An MCB that protects against both types of overloads and short circuits is a good idea. An RCBO can be too expensive and not provide the same level of protection. To avoid unwanted tripping, you need to use a Type B MCB. Type B is the best to prevent unwanted tripping.