Qual Tipo de Disjuntor É Projetado Para Ser Recondicionado?

Caso sua instalação utilize equipamentos de manobra obsoletos, você pode se perguntar se é possível reformar seus disjuntores ou se deve adquirir dispositivos novos. A resposta não é tão simples, pois depende do tipo de disjuntor presente em sua instalação. Conforme estabelecido pelo National Electrical Code (NEC) de 2020, disjuntores de baixa tensão, disjuntores de média tensão e disjuntores de alta tensão podem ser restaurados, enquanto disjuntores em caixa moldada (MCCBs), disjuntores GFCI e disjuntores AFCI não devem ser renovados segundo o Artigo 210.15 e a Seção 240.88 do NEC. Consequentemente, essa distinção é muito importante para gerentes de plantas, empreiteiros elétricos e engenheiros de manutenção que precisam equilibrar custos com segurança e conformidade com o código.

Resposta rápida: Os disjuntores que podem ser reformados incluem disjuntores de baixa tensão, disjuntores de média tensão e disjuntores de alta tensão. Disjuntores em caixa moldada não podem ser reformados conforme o NEC 240.88(A)(1), e qualquer disjuntor que forneça proteção GFCI, proteção AFCI ou GFPE é proibido pelo NEC 210.15. Fabricantes notáveis que oferecem reforma em fábrica incluem: Eaton, ABB e Schneider Electric / Square D. O processo de reforma está em conformidade com as normas IEEE C37.59 e NEMA AB 4. Geralmente, o custo da reforma corresponde a 40-60% do custo de um disjuntor novo e adiciona 10-20 anos de vida útil.

Tipos de Disjuntores Permitidos para Recondicionamento

Conforme a Seção 240.88(A) do NEC 2020, os seguintes tipos de disjuntores são explicitamente permitidos para recondicionamento:

Tipo de Disjuntor	Referência NEC	Aplicação Típica	Faixa de Tensão
Disjuntores de baixa tensão	88(A)(2)	Disjuntores extraíveis em equipamentos de manobra, disjuntores principais de serviço	Até 1.000V CA
Disjuntores de média tensão	88(A)(3)	Subestações industriais, distribuição em grandes instalações	000V – 38kV
Disjuntores de alta tensão	88(A)(3)	Subestações em escala de utilidade, transmissão	Acima de 38kV
Painéis de distribuição e seções de equipamentos de manobra	8(B), 490.49	Modernização completa da linha de equipamentos de manobra	Diversos
Relés eletromecânicos de proteção e TC	88(B)(2)	Sistemas de proteção em subestações	Diversos

A característica principal compartilhada por todos os disjuntores recondicionáveis é que eles são do tipo extraível ou removível projetados para manutenção — não unidades seladas. Disjuntores de baixa tensão, como aqueles usados em disjuntores a ar com corrente nominal de até 6300A, são especificamente projetados com mecanismos que permitem manutenção em campo, contatos substituíveis e unidades de disparo acessíveis. Isso é fundamentalmente diferente dos disjuntores em caixa moldada, que são selados de fábrica.

Por que Disjuntores de Potência Podem Ser Recondicionados

Disjuntores são projetados para permitir manutenção. Suas características incluem:

Contatos Substituíveis – inspeção e substituição dos contatos de arco e principais podem ser realizadas
Mecanismos Operacionais Acessíveis – manutenção pode ser realizada nas molas, articulações e travas do disjuntor
Unidades de disparo intercambiáveis – é possível atualizar as unidades eletrônicas de disparo dos disjuntores
Design extraível – o disjuntor pode ser removido do painel sem desligar a energia
Sistemas extensivos de isolamento – o isolamento existente pode ser limpo, testado e reabilitado

Para mais informações sobre a diferença entre categorias de disjuntores, nosso guia sobre o que são MCCB e MCB aborda as diferenças estruturais que determinam a possibilidade de manutenção.

Tipos de Disjuntores Proibidos para Recondicionamento

De acordo com a NEC 2020, existem itens que são proibidos de serem recondicionados. Essas proibições decorrem do fato de que a natureza crítica para a segurança deste equipamento torna imperativo que quaisquer alterações internas afetem suas características de segurança.

Equipamento Proibido	Referência NEC	Motivo
Disjuntores em caixa moldada (MCCBs)	88(A)(1)	Selados de fábrica; romper o selo invalida a certificação UL e a calibração
Dispositivos de proteção GFCI	210.15(1)	Safety-critical personnel protection; calibration cannot be verified after reconditioning
AFCI protection devices	210.15(2)	Complex electronics detect arc signatures; reconditioning could miss subtle degradation
Ground-fault protection of equipment (GFPE)	210.15(3)	Equipment protection function must remain factory-calibrated
Electronic trip units for LV power breakers	240.88(B)	Electronics cannot be reliably reconditioned; must be replaced with new
Panelboards	408.8(A)	Structural integrity and bus connections cannot be verified post-reconditioning
Transfer switches (emergency systems)	700.5(C), 701.5(C), 702.5(A)	Life-safety applications require new equipment
Fire pump controllers	695.10	Critical life-safety equipment
Receptacles and attachment plugs	406.3(A), 406.7	Wear and contact degradation not reliably detectable

Stressing the point about MCCBs: Even if previously some inspections and preventative maintenance practices were permitted according to NEMA AB 4 standards, it should be noted that re-conditioning of molded case circuit breakers has been prohibited in the latest 2020 edition of NEC. Maintenance (cleaning, exercising, torque checking) is still valid but any disassembly of internal structure and reconstruction of molded case circuit breakers is not allowed.

Brands That Support Circuit Breaker Reconditioning

Different well-known manufacturers manage the reconditioning programs authorized by their factories. They do not use refurbishers working on behalf of other companies.

Marca	Program Name	Coverage	Garantia
Eaton	Class 1 Reconditioning (Power Breaker Reconditioning Centers)	Eaton and non-Eaton LV/MV power breakers; Magnum DS remanufacturing; VCP-W FAME upgrades	3-year (1-year for motor starter applications)
ABB	Service Center Breaker Refurbishment	ABB and non-ABB breakers; nuclear and non-nuclear; LV and MV	1-year parts and labor
Schneider Electric / Square D	Modernization Solutions / Circuit Breaker Reconditioning	Square D and most major OEM brands; LV and MV breakers; switchgear modernization	Varies by scope
Siemens	Service & Reconditioning Programs	Siemens and legacy brands (ITE, Gould); LV and MV power breakers	Varies by program
GE / Vertiv	Reconditioning Services	GE breakers and legacy brands; MV and HV breakers	Varies by program

What Each Brand Offers

In the region of North America, Eaton has founded five Power Breaker Reconditioning Centers. Their class 1 protocols include the complete disassembly of parts, cleaning in compliance with component standards, resurfacing, and eventually, the final performance testing. They have also developed the FAME upgrade concept for some specific mid-volt breakers as well as retrofitting of circuit breakers with the Digitrip RMS trip unit and Arcflash Reduction Maintenance System. Each reconditioned breaker is added to the central Pow-R-DB database.

In their service centers, ABB offers reresting services for both their own circuit breaker models and for those of other manufacturers. Their services include receiving the equipment, inspecting and testing it, and disassembling it. As well as cleaning all parts, ABB will also check for cracking, be sure to replace already damaged parts, apply lubrication of all moving points, then reassemble it.

In its Modernization Solutions program, Schneider Electric invited the service of reconfiguring low- and medium-voltage power circuit breakers. The reconditioning is performed by using the following steps: through all stages, including partial replacement of components, washing and painting of details, and lubrication.

Key Standards: NEC, NEMA AB 4, IEEE C37.59 & UL 489

Multiple standards govern circuit breaker reconditioning. Understanding which applies to your situation is essential for code compliance:

Norma	Publisher	Scope
NEC Article 210.15 & 240.88	NFPA	Defines what can and cannot be reconditioned; requires listing as “reconditioned”
NEMA AB 4	NEMA	Guidelines for inspection and preventive maintenance of molded-case breakers (not reconditioning)
IEEE C37.59	IEEE	Standard for reconditioning power switchgear equipment; defines the reconditioning process
UL 489	UL	Standard for molded-case circuit breakers; relevant as a testing benchmark
NEMA Policy on Reconditioned Equipment	NEMA	Industry positions on suitability and safety of reconditioned equipment
PEARL Standards	PEARL	ANSI-accredited standards for inspecting, testing, and reconditioning electrical apparatus

The essential factor: the initial marking must be taken away and the equipment must be identified as reconditioned when it is refurbished. UL provides a certification procedure for reconstructed equipment. The devices renovated in compliance with the procedure are marked with the UL Mark containing the word “Rebuilt,” “Remanufactured,” “Rebuilt,” or “Reconditioned.” For more on breaker standards, see our article on UL 489 breaker requirements.

The Reconditioning Process Step by Step

According to Eaton Class 1 and IEEE C37.59, this is the process undertaken when the circuit breaker needs reconditioning:

Step 1: Incoming Inspection & Testing

The breaker is received, visually inspected, and tested in the “as received” condition to document baseline performance. The important measurements taken include contact resistance (in millivolts) insulation resistance, mechanical operating effort and dimensions. The information obtained is documented.

Step 2: Complete Disassembly

The disassembly of the breaker is complete and the breaker has been taken apart into its components including: the operating system, the arc chute, the insulation barrier, frame and other systems. This is the stage where one identifies flaws such as, the faulty drive link, or misaligned contacts, damaged insulation that makes the whole device liable to failure when the fault is detected.

Step 3: Component-Specific Cleaning

Various types of materials need various types of cleaning processes. The non-current components are cleaned thoroughly in such a way that no foreign material is left while dielectric and structural characteristics are preserved. The current components are cleaned without damaging the original plating. Contact surfaces are regenerated so that metallurgy and contact pressure play their role properly.

Step 4: Inspection & Part Replacement

All parts should be checked for cracks, deterioration, rust, and size accuracy. Parts that have worn out are replaced by new OEM parts, while parts that are not in production anymore will need to be replaced with reverse-engineered components which must comply with standards stated in IEEE C37.59. Such components may require verification in strict laboratory conditions such as examples of high-power testing. The typical substitutes for the worn parts may be springs, contacts, shunts, and bushing.

Step 5: Re-Lubrication

All outdated lubricants have been eliminated, and the machine and connection points are relubricated using grease specified by the manufacturer. One of the key reasons that circuit breakers fail is due to inappropriate lubrication — stiff mechanisms slow down the process of trouble clearing, which results in much higher arc flash incident energy.

Step 6: Reassembly to OEM Specifications

In the process of reassembling the breaker, the OEM documentation is utilized. However, if OEM information is not available, for instance if the original manufacturer is defunct, Eaton will instead use the centralized Pow-R-DB database of records from similar breakers that are proven to give desired outcomes.

Step 7: Final Testing

The rebuilt circuit breaker will go through conclusive testing as per IEEE and NEMA guidelines including:

Insulation resistance assessment
Contact resistance test (millivolt drop)
Mechanical operation assessment (open-close timing)
Overcurrent trip test (long-time, short-time, instantaneous trip)
Dielectric withstand assessment

Step 8: Documentation & Labeling

The production of the test report occurs to establish a contrast between “as received” and “final” test findings, supported by information mentioning all the fixed components. The circuit breaker is provided with a traceability label signifying it as reconditioned, which indicates the name as well as the date of the reconditioning firm. The circuit breaker is operational again.

When to Choose Reconditioning vs. Replacement

The decision to recondition or replace depends on breaker type, age, criticality, and cost. Here’s a practical decision matrix:

Scenario	Recommendation	Reasoning
LV/MV power circuit breaker in switchgear, 15–30 years old	Recondition	Designed for maintenance; OEM parts available; 40–60% cheaper than new
Power breaker with obsolete trip unit	Recondition + trip upgrade	New solid-state trip unit extends life and adds arc-flash reduction features
MCCB in panelboard that’s failing	Replace	NEC prohibits MCCB reconditioning; replacement is the only code-compliant option
GFCI or AFCI breaker	Replace	NEC 210.15 explicitly prohibits reconditioning of safety devices
Power breaker with severe arc damage	Replace	Extensive damage may compromise structural integrity; reconditioning cost may exceed replacement
Switchgear lineup needing modernization	Recondition breakers + retrofill	Extends switchgear life without total replacement; minimizes downtime
Emergency system or life-safety circuit	Replace with new	Insurance and code requirements may mandate new equipment for critical circuits

For help diagnosing whether your breaker actually needs attention, see our guide on como saber se um disjuntor está ruim. And if replacement is the right call, our article on how much it costs to replace a circuit breaker covers pricing across breaker types and amperage ratings.

Cost Comparison: Reconditioned vs. New

When it comes to the reconditioning of circuit breakers, the expenses usually range between 40 and 60% of the total cost of acquiring new equipment. This is especially true for larger models that can help save lots of money:

Tipo de Disjuntor	New Cost (Approx.)	Reconditioned Cost (Approx.)	Savings
LV power breaker, 800A frame	$8,000–$15,000	$3,200–$9,000	40–60%
LV power breaker, 3200A frame	$20,000–$40,000	$8,000–$24,000	40–60%
MV vacuum breaker, 5kV	$15,000–$30,000	$6,000–$18,000	40–60%
MV vacuum breaker, 15kV	$25,000–$50,000	$10,000–$30,000	40–60%
Trip unit upgrade (Digitrip/AC-PRO)	$3,000–$8,000	Included in reconditioning	Bundle savings

Additional expenses: The reconditioning process saves costs associated with switchgear modification that would be needed in case of changes in size of a new breaker, minimizes lead time since reconditioned breakers arrive in 2-4 weeks in contrast to the new ones that will be delivered in 12-20 weeks, and reduces the downtime due to the fact that the reconditioned breaker can be immediately implemented in the current cubicle.

Safety Considerations & Documentation Requirements

Reconditioning can be performed only by certified personnel in line with accepted standards. Here are the requirements that need to be checked before installation of a reconditioned circuit breaker:

Labeling: The reconditioned circuit breaker is marked “Reconditioned” with the name of the reconditioning company and date.
Test: Get a complete report evidencing “as received” and “final” test results along with a list of parts replaced.
Certification: In case UL certification is required, verify that the circuit breaker is marked with UL Mark with “Rebuilt” or “Reconditioned.”
Approval by AHJ: The Authority Having Jurisdiction (electrical inspector) may need proof of reconditioning by a certified company – stay prepared.
Warranty: Verify the warranty conditions and length (Eaton: 3-year; ABB: 1-year; others vary).
Traceability: The reconditioning company should do recordkeeping linked to the circuit breaker serial number for future reference.
Do not install the reconditioned circuit breaker in the life-safety circuit unless the AHJ and your insurance agent approved the installation.

Also, OSHA 29 CFR 1910.334(b)(2) states that once the circuit is de-energized with the protective device it is not allowed to re-energize it manually until it is determined that the equipment and circuit can be safely energized.

Perguntas Frequentes

What is a reconditioned circuit breaker?

A reconditioned power circuit breaker refers to a power circuit breaker which has undergone a restoration process at a factory-authorized facility. According to the requirements set forth by IEEE C37.59, the entire activity involves an incoming inspection, complete disassembly, cleaning of components, replacement of parts, reapplication of lubricants, reassembly of components according to OEM specifications, and final testing. In addition, the circuit breaker must be labeled as being reconditioned with the name and date of the reconditioning firm, and the original listing had to be taken off due to the NEC requirements.

What are type B, type C, and type D circuit breakers?

Types B, C, and D are classifications of MCBs regarding tripping characteristics and not types of circuit breakers classified according to NEC 240.88. Type B circuit breakers trip at three to five times the rated current; these are used in residential applications for circuits with purely resistive loads. After that, we have Type C circuit breakers, which trip at five to ten times the rated current and are used in commercial and industrial electrical systems, as well as circuits with inductive loads, such as fluorescent lights and small motors. The third type is Type D MCBs, which trip at ten to twenty times the rated current and deal with inrush current in transformers, large motors, or welding machines. All the above types of breakers are miniature circuit breakers, molded-cased, and cannot be reconditioned in accordance with NEC 240.88(A)(1).

Are molded case circuit breakers permitted to be reconditioned?

Based on the NEC Section 240.88(A)(1) in the year 2020, it is not allowed to refurbish molded- case circuit breakers. MCCBs come as sealed units hence breaking the seals means losing the UL listing and warranty of the manufacturer. Though there is guidance for inspection and preventive maintenance of MCCBs in the NEMA AB 4 guidelines, it is not equal to reconditioning. Routine maintenance is fine but disassembly or modification of the internal structure of the MCCB is not accepted.

Which type of equipment is not allowed to be reconditioned according to article 210?

The NEC states under Article 210.15 that there are three kinds of equipment that are not permitted to be reconditioned. These include (1) equipment that supplies personnel with ground-fault circuit interrupting (GFCI) protection, (2) equipment that supplies arc-fault circuit interrupting (AFCI) protection, and (3) equipment that provides ground-fault protection for equipment (GFPE). The reason for these prohibitions is that the devices that are required to be reconditioned are also safety critical devices that possess calibration and sensitivity requirements that cannot be assured even after they are reconditioned. Thus, if any of the reconditioned devices (GFCI, AFCI, or GFPE) fails to trip at the required threshold, then a life hazard will be created. Also, the NEC states that molded circuit breakers cannot be reconditioned by Section 240.88(A)(1) nor can the electronic trip units of low-voltage power circuit breakers be reconditioned according to Section 240.88(B).

Referências

Reconditionable circuit breakers include low-voltage, medium-voltage, and high-voltage circuit breakers of the draw-out, field-serviceable type that are commonly used in substations and switchgear. The design of the circuit breaker makes use of replaceable contacts, easily accessible mechanism, and interchangeable trip units allowing practical reconditioning in compliance with NEC 240.88. Major manufacturers such as Eaton, ABB, and Schneider Electric offer the reconditioning service according to IEEE C37.59 standards guaranteeing warranties comparable to what new equipment receives.

On the other hand, molded-case circuit breakers, GFCI devices, AFCI devices, and GFPE equipment are unconditionally prohibited from being reconditioned as per NEC 210.15 and 240.88 and must be replaced if broken. The 2020 NEC has made it clear that circuit breakers designed to be maintained may be maintained while sealed safety-critical breakers may not. When opting for reconditioning or replacement, identify the type of circuit breakers first and compare the cost of failure, so you are able to understand what is worth doing more — reconditioning or replacing the circuit breaker.