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Innovation, engineering and constant endeavor to meet customer demands and needs has positioned ASPIRO group as a trusted and reliable name in the field of Miniature Circuit Breakers, Residual Current Circuit Breakers, Distribution Boards, Changeover Switches, Switch-Disconnector, Fuses, Rewireable Switch Fuse Unit, Busbar Chambers and allied products of Low Voltage Switchgear. To be able to contribute towards ‘Go Green’ and to support the [...]

  • Electric Breaker, Solar Battery, Flooded Lead Acid Battery, Gel Battery, Lead-acid Battery, Lithium Ferro Phosphate Battery, Lithium-Ion Battery, Solar inverter, Grid Tie Inverters, Hybrid Inverters
  • India
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HVACR EQUIPMENT Supply-Installation of: Split Type Air-Con System Ducted-Packaged Air-Con System Air-Cooled Chillers System Water Cooled Chiller System LED Technologies NDI LARK International LED Technologies deliver high quality LED lights for residential and commercial user EU/CN MORE SOLAR products SNDI LARK International SOLAR products : EU/CN NDI LARK INTERNATIONAL SOLAR HEATING SYSTEMS :TURKEY NDI LARK International SOLAR POWER [...]

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Johsun, a distinguished high-skilled voltage stabilizer manufacturer, embarked on its journey in 2002 with a singular objective – to deliver robust power solutions to a diverse clientele comprising power establishments, telecom companies, industrial entities, and end users. Our extensive product range encompasses voltage stabilizers, regulators, UPS inverters, solar inverters, step-up and step-down transformers, voltage protectors, switching [...]

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Kayal Electrical Solutions is a distinguished enterprise specializing in the manufacturing of innovative electrical components, with a primary focus on Combiner Boxes and PV components. Established in 2002, our company, officially known as Kayal, has become a leading player in the industry, consistently delivering top-notch products such as Array Monitors, Surge Protector Devices, Definite Purpose Contactors, AC/DC Magnetic Contactors, DC [...]

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In 2009, Yueqing Yirui Electric Appliance Co., Ltd. (YRO) was established with a vision to revolutionize the photovoltaic industry through cutting-edge protective components. With a sprawling factory encompassing 3000 square meters, YRO has become a prominent player in the market, delivering top-notch solutions to enhance the efficiency and safety of solar power systems worldwide. With over a decade of dedicated service in the electrical [...]

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Tormeka is a forward-thinking company deeply passionate about revolutionizing the manufacturing landscape. Our commitment lies in crafting exceptional products and services while simultaneously ushering in innovative technological advancements that span various industries. At Tormeka, our unwavering dedication extends to environmental responsibility, the enhancement of human well-being, and the promotion of circularity. We are steadfast in our [...]

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Electric Breaker

Electric Breakers

When installing a solar panel system, you have to be familiar with the electric breakers and how it works with a solar PV system to avoid future electric problems. The electric breaker is one of the main components of a solar power system that provides safety mechanisms. If ever the electrical wiring of your system has too much current flowing through it, these breakers can easily cut the power until your solar installer can fix the system’s problem. 

For today’s article, we will discuss electric breakers and their function in solar photovoltaic systems.

What is an Electric Breaker?

An electric or circuit breaker is an electrical switch designed to protect electrical circuits from damage caused by overloading of current or a short circuit. The basic function of an electric breaker is to prevent the current flow once protective relays detect a fault in the system. 

Although it is frequently interchanged with a fuse, which is the simplest Over Current Protection device (OCPD) in electrical circuits, a circuit breaker, is a much-evolved type of device that interrupts the current flow. The main difference between the two is electric breaker is resettable and the fuse is not. The fuse sacrifices itself while protecting the system to overheat, while the circuit breaker can withstand hundreds and thousands of operations. Another difference is that electric breakers are used with relatively higher currents. 

Components of Circuit Breaker

A circuit breaker system is composed of three parts. These three components are the sensing system, relay, and the combination of contacts and the contact actuator. A sensing system is responsible for detecting an overload situation, while a relay is responsible for transferring the information to the switching arrangement, and the combination of contacts and the contact actuator. This electric arrangement is usually observed in power transmission and distribution networks dealing with very high currents, voltages, and powers. 

Circuit Breakers Calculation in Solar Panel Systems

When connecting circuit breakers to the PV system, you have to follow the recommended calculations to avoid future problems and damage to the entire system. The recommendations for using overcurrent protection devices including circuit breakers in solar modules against overloading conditions are given in IEC 60269-6 (volume 6 of IEC 60269-6) and also UL 248-19. 

For circuit breakers, IEC recommends a 20% and 25% margin in voltage and overload current. Most of the time, the ratings are specified by the solar manufacturers at given ambient conditions. If the temperatures exceed this given value, derating must be applied according to the manufacturer’s specifications. 

When it comes to breaker sizes for solar panels, NEC requires the breakers to be sized at 125% of the inverter’s rated output. So a 7680W inverter that outputs 240V, outputs 32A (7680W ÷ 240V = 32A). That requires a 40A breaker (32A x 125% = 40A).

Final Thoughts

If you owned a solar panel system at home,  you have to understand how circuit breakers work to prevent catching fires at home. These devices are one of the major components of the PV solar system as they protect the system wiring from getting too hot and accidentally catch fire if short circuits occurred. Thus, understanding the breaker itself and its proper calculations in the PV system should be done.