Ensemble d'appareillage de commutation sous enveloppe métallique basse tension GGD, GGJ, MNS

Détails sur les appareillages de commutation moyenne et basse tension industriels GGD, GGJ, MNS

Les GGD (Enceinte de distribution de puissance générale fixe) et GCK (Enceinte de commutation basse tension générale extractible) sont deux types principaux et matures d'enceintes de commutation basse tension. Ils sont largement déployés dans les parcs industriels, les immeubles commerciaux, les ateliers d'usine et d'autres scénarios, assumant des fonctions essentielles de contrôle centralisé de l'alimentation, de protection contre les défauts électriques, de transmission d'énergie sécurisée et de distribution de puissance raisonnable pour les systèmes d'alimentation basse tension.

The GGD series belongs to fixed-type appareillage de commutation basse tension. All core internal components including circuit breakers, busbars, relays and wiring structures are fixedly installed inside the cabinet with stable structural integration, which features firm installation, strong structural rigidity and low failure rate. This fixed design ensures stable long-term operation and simplifies daily routine inspection work. It is applicable to low voltage power distribution systems with a rated current up to 3200A. Meanwhile, we can conduct targeted personalized structural design and functional configuration according to the actual power demand, on-site installation environment and customized operational requirements of different projects to meet diverse application standards.

En revanche, la série GCK est une armoire de distribution d'énergie basse tension de type débrochable hautes performances. Ses composants fonctionnels principaux tels que les disjoncteurs sont conçus avec une structure débrochable intégrée. Lors de la maintenance quotidienne des équipements, du remplacement de composants ou de la gestion des défauts de circuit, les unités fonctionnelles peuvent être directement retirées indépendamment sans arrêter l'ensemble du système de distribution d'énergie ni couper l'alimentation globale. Cela améliore considérablement l'efficacité de la maintenance, évite les pertes dues aux pannes de courant généralisées et garantit la continuité du fonctionnement du système. Prenant en charge un courant nominal maximum de 4000 A, l'armoire GCK offre d'excellentes capacités de personnalisation flexible. Elle permet d'ajuster librement les modules fonctionnels internes, les configurations de circuits et les paramètres de protection en fonction des conditions de charge sur site et des exigences du projet, s'adaptant parfaitement aux scénarios de distribution d'énergie complexes et variables.

The product lineup covers GGJ and MNS series Ensemble d'appareillage de commutation clos en métal basse tension, further enriching the application coverage of LV power distribution solutions. All models in this product series adopt compact cabinet structure design and optimized internal layout, which effectively saves installation space while ensuring efficient power transmission and stable system operation. With standardized manufacturing technology, strict safety protection design and reliable operational performance, GGD, GCK, GGJ and MNS low voltage switchgears deliver safe, efficient and economical power distribution services, becoming the preferred power distribution equipment for numerous industrial production and commercial construction projects.

Technical Features

Metal‑Enclosed Construction

All our products feature a metal enclosed switchgear design – every live part is housed inside an earthed metallic enclosure, preventing accidental contact and protecting against dust, moisture, and mechanical impact. This robust construction enhances operator safety and equipment longevity, making it ideal for harsh industrial environments.

Compliance with International Standards

Our switchgear strictly follows IEC 61439‑1:2020 and other relevant parts of the IEC 61439 series. These standards define the general rules, service conditions, structural requirements, and verification tests for low‑voltage switchgear and controlgear assemblies. Additionally, we comply with IEEE C37.20.1 (for metal‑enclosed low‑voltage power circuit breaker switchgear) and GB7251.1 (Chinese national standard) to ensure global acceptance.

Customization Capabilities

We offer custom low voltage switchgear solutions tailored to your specific voltage, current, number of ways, protection degree (IP), and environmental conditions. Our modular design allows easy system expansion and upgrade, ensuring that your power distribution system grows with your needs.

Metal‑Enclosed vs. Metal‑Clad Switchgear – Clarification

Metal‑enclosed switchgear (like our GGD, GGJ, and MNS) houses all components within a common earthed metal enclosure, with functional units separated by air gaps but without solid barriers between compartments. It is compact, cost‑effective, and sufficient for most industrial and commercial applications.

Metal‑clad switchgear, on the other hand, is a subset of metal‑enclosed where each major component (circuit breaker, busbars, instrument transformers) is installed in its own individual metal compartment, separated by grounded metallic barriers. This provides superior fault containment and is preferred for critical installations where arc‑flash safety is paramount.

Our MNS series, with its modular drawers, offers many of the benefits of metal‑clad design while retaining the flexibility of a withdrawable system – making it an excellent choice for projects that demand high reliability and easy maintenance.

Low Voltage Switchgear Maintenance

• Install the switchgear in a clean, dry, and well‑ventilated location.

• Ensure adequate working and maintenance clearances around the equipment.

• Follow the manufacturer’s maintenance manual for routine checks and lubrication.

• Perform regular visual inspections to detect corrosion, loose connections, or signs of overheating.

• Schedule preventive maintenance (cleaning, tightening, contact resistance measurement, and functional testing) to avoid unexpected failures.

• Keep a maintenance log to track performance and predict component replacement intervals.

Why Choose Us – A Trusted China MNS Low Voltage Withdrawable Switchgear Factory

As a specialised china mns low voltage withdrawable switchgear factory, we combine advanced manufacturing technology, strict quality control, and competitive pricing. Our products are type‑tested according to IEC 61439, and we offer comprehensive after‑sales support, including installation supervision, commissioning, and training. Whether you require standard panels or custom low voltage switchgear for specialised applications, we are your reliable partner in power distribution solutions.

Lecture d'ingénierie connexe

Tableau électrique basse tension GGD vs MNS · Stratégie de protection des appareils de commutation basse tension

Pour une revue d'ingénierie, contacter Shenheng Power avec le schéma unifilaire approuvé, les conditions du site, les normes requises et les exigences de livraison.

FAQs

What is low voltage switchgear?

Low voltage switchgear is an assembly of electrical devices – including circuit breakers, switches, relays, and fuses – used to control, protect, and isolate electrical circuits operating at voltages below 1 kV AC (or 1.5 kV DC). Its primary functions are power distribution, fault protection (short‑circuit, overload), and safe switching operations.

What is the difference between LV and MV switchgear?

The main difference lies in the voltage level. LV (low voltage) switchgear operates at voltages up to 1000V AC or 1500V DC, while MV (medium voltage) switchgear covers 1 kV to 36 kV (or higher in some regions). In a power network, MV switchgear is typically upstream and feeds multiple LV switchboards.

What is the IEC standard for low voltage switchgear?

The primary standard is IEC 61439 series. Specifically, IEC 61439‑1:2020 sets the general rules and common requirements for all low‑voltage switchgear and controlgear assemblies. Other parts (e.g., IEC 61439‑2, ‑3) cover specific types like power switchgear and distribution boards.

What are ELV, LV, and HV?

A: According to IEC definitions:

• ELV (Extra‑Low Voltage): ≤ 50 V AC or ≤ 120 V DC (ripple‑free)

• LV (Low Voltage): > ELV but ≤ 1000 V AC or ≤ 1500 V DC

• HV (High Voltage): > 1000 V AC or > 1500 V DC

Is 24V classed as ELV?

A: Yes. Both 24V AC and 24V DC are well below the 50V AC / 120V DC thresholds, so they fall under ELV.

What are the three types of ELV systems?

IEC defines three ELV system types:

1. SELV (Safety Extra‑Low Voltage) – the safest, uses an isolating transformer and requires no additional protective measures against electric shock.

2. PELV (Protective Extra‑Low Voltage) – may be earthed, but requires equipotential bonding for safety.

3. FELV (Functional Extra‑Low Voltage) – does not meet SELV or PELV conditions; additional protection measures are needed depending on the application.

What is the life expectancy of low‑voltage switchgear?

Traditionally around 40 years, but modern designs typically expect 10–20 years under normal service conditions. Actual lifespan depends on operating environment, load cycles, and the quality of routine maintenance. Regular preventive maintenance can significantly extend service life.

What is the IEEE standard for low‑voltage switchgear?

The key IEEE standard is IEEE C37.20.1 – Standard for Metal‑Enclosed Low‑Voltage Power Circuit Breaker Switchgear. It covers service conditions, ratings, temperature limits, insulation classes, dielectric tests, and application guidelines.

What is the standard for low‑voltage switchgear?

The major applicable standards include:

• IEC 61439 series (international)

• IEEE C37.20.1 (North America)

• GB7251.1 (China)

• IEC TR 63482:2024 (maintenance guide for low‑voltage switchgear)