Thermal-Magnetic Trip MCCB
Plastic copper frame, 50kA/100kA breaking capacity, 690VAC/400VAC 50/60Hz engineered for rigorous motor and transformer sub-stations.
Technical Data
Direct From Manufacturer
Integrated Low-Voltage Power Protection Systems
Engineered in compliance with IEC 61643-11, IEC 60947-2, and IEC 60898-1 standards. Our complete equipment range delivers multi-level cascade protection from primary utility entrance down to final terminal automation.
Three-Phase PC Class Dual Power ATS
High-reliability transfer switch operating 63A to 125A. Essential for continuous manufacturing line backup and commercial genset integration.
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Electromagnetic Miniature RCCB
2P/4P residual current protection switch, rated 16A to 63A. Provides sensitive residual earth fault current trip under damp environments.
Technical Data
2P Single-Phase 220V Automatic Transfer Switch
6kA breaking capacity with 63A frame rating. Built for rapid emergency switching for telecom masts, cold-storage monitors, and light commercial panels.
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CJX2-8011 3-Pole AC Magnetic Contactor
50Hz 3-Phase 3-Pole DIN rail industrial magnetic contactor. Engineered for heavy inductive motor switching, pump systems, and industrial HVAC.
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ZTQ3-100A/4P Dual Power ATS
Customizable breaking capacity and switched neutral configuration for four-wire 400V industrial grids, preventing zero-sequence voltage floating.
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2P DC 500V Photovoltaic MCB
Rated 80A, 100A, 125A with C-curve trip mechanics. Designed for solar string combiner boxes, inverters, and commercial PV battery storage arrays.
Technical Data
Mechanical Interlocking MCB (1P+N, 2P, 3P, 4P)
50Hz manual transfer isolation breaker. Prevents accidental parallel connection of municipal supply lines and localized backup generator feeds.
Technical Data
100kA
Max Surge Current (Imax)
<25ns
Ultra-Fast Nanosecond Response
100%
High-Purity Zinc Oxide MOV
IP20/V0
Flame Retardant Housing
Technical Insight & Information Gain
Engineering Grid Resilience for the Bago Market
A rigorous perspective on why transient overvoltage suppression and coordinated power switching are vital for industrial infrastructure across the Bago corridor.
The Anatomy of Electrical Disturbances in Lower Myanmar's Commercial Hub
The Bago Region serves as a pivotal strategic economic gateway connecting Yangon to upper Myanmar and international deep-sea logistics corridors. However, local electrical engineers, switchgear fabricators, and facility operators encounter severe electrical operating challenges. The local climate exhibits intense tropical thunderstorms during the monsoon season, generating some of the highest keraunic levels (thunderstorm days per year) in Southeast Asia. Direct and indirect lightning strikes on exposed overhead distribution lines induce massive high-energy transients (8/20µs and 10/350µs waveforms) that breach distribution substations and propagate directly into factory switchboards.
Compounding this atmospheric challenge is the reality of operational grid stability. The regional power network frequently experiences rapid switching events, load shedding, single-phasing conditions, and sustained transient overvoltages (TOVs). When localized industrial setups switch high-power inductive loads—such as rice milling extruders, lumber sawmill blades, spinning mills, and cold storage refrigeration compressors—severe inductive kickbacks and voltage notches ripple across feeder circuits. Without coordinated, multi-stage Class I (Type 1) and Class II (Type 2) surge protective devices coupled with robust, fast-tripping MCCBs and transfer switches, sensitive programmable logic controllers (PLCs), variable frequency drives (VFDs), and precision instruments suffer immediate semiconductor puncture or chronic thermal degradation.
Zhejiang Graybar Electric Co., Ltd. addresses this gap by manufacturing tailored low-voltage electrical protection assemblies. By integrating high-energy Metal Oxide Varistors (MOVs) with internal thermal disconnector links, gas discharge tubes (GDTs) for N-PE galvanic isolation, and arc-chute enhanced molded breakers, we provide Bago's industries with hardware built to handle harsh, high-ambient-humidity tropical installations.
| Installation Location | Protection Level | Recommended Graybar Architecture | Key Technical Specifications | Local Bago Engineering Context |
|---|---|---|---|---|
| Main Distribution Board (MDB) | Class I + Class II Combined (Type 1+2) | Heavy-Duty Combined SPD + 4P 250A MCCB | Iimp 12.5kA–25kA (10/350µs), Imax 80kA–100kA (8/20µs), Up ≤ 1.8kV | Direct connection to incoming grid transformer feed; absorbs direct atmospheric lightning surges and utility switching spikes. |
| Sub-Distribution Panels (SDB) | Class II (Type 2) | DIN-Rail Modular SPD (3P+N) + 63A MCB Isolator | In 20kA, Imax 40kA–60kA (8/20µs), Up ≤ 1.5kV, Un 230/400V | Branch circuits feeding workshop automation, food packaging conveyor motors, and multi-tenant warehouse distribution. |
| Emergency & Backup Switchboards | Switching Isolation & Transfer | ZTQ3 Series 4-Pole Dual Power ATS + CJX2 Contactors | PC Class / CB Class, 63A–125A Frame, <50ms transfer | Critical automatic transfer between unreliable utility grid and onsite diesel/gas backup generators during power outages. |
| Solar Inverter Combiners | DC Surge Protection (Type 2) | 2P DC 500V/1000V PV Breakers + DC SPD Units | Ucpv up to 1000V DC, In 20kA, Imax 40kA, C-Curve | Protects rooftop photovoltaic arrays across factories against induced lightning overvoltage along open cabling runs. |
Agro-Industrial Mills & Processing
Bago's extensive rice milling, oil extraction, and sugar processing mills operate high-inertia electric induction motors. The rapid start-stop cycles create intense voltage transients. Our 100kA breaking capacity MCCBs combined with DIN rail contactors guarantee motor safety and prevent nuisance tripping.
Inductive Load SuppressionSpecial Economic Zone (SEZ) Light Manufacturing
Garment manufacturing, precision assembly facilities, and logistics centers situated around Bago require clean, transient-free power for automated sewing lines, computer server racks, and automated packaging. Our Type 2 AC SPDs clamp overvoltages under 1.5kV to protect sensitive digital electronics.
Sub-Distribution ClampRooftop Photovoltaic & Commercial Solar
Given regional utility power fluctuations, Bago factories are installing rooftop solar arrays at scale. Our 500V/1000V DC miniature breakers and DC-rated surge arresters protect expensive string inverters from potential differences between building earth pits and exposed roof frames.
DC String Protection
Enterprise Credentials
Why Electrical Contractors & Importers Partner With Graybar
Combining world-class manufacturing at Liushi Town with direct technical export capabilities for the Southeast Asian electrical trade.
Liushi Production Scale
- Located in Wenzhou’s low-voltage electrical capital
- In-house tooling, stamping, moulding, and automated assembly
- Direct procurement of ultra-pure silver contacts and flame-resistant PBT resins
- Integrated quality control from raw pellet to finished breaker
Full IEC Compliance
- Designed and tested under IEC 61643-11, IEC 60947-2, IEC 60898-1
- Rigorous trip-time, dielectric breakdown, and clamping verification
- Type-test reports provided with batch shipments
- Certified flame retardancy (UL94-V0 rated enclosures)
Flexible Supply Terms
- Low initial MOQs (from 5 pcs for MCB/MCCB/SPD; 1 pc for ACB)
- Consolidated container shipments combining breakers, ATS, and contactors
- Shock-proof export palletization and moisture-barrier tropical packaging
- Efficient sea-freight routing to Yangon Port and land borders
OEM & Engineering Support
- Customized front-panel branding, laser-etched wiring diagrams
- Multi-lingual technical manuals and datasheets
- Direct engineering consultation on single-line diagrams (SLD)
- Rapid turnaround for customized coil voltages and breaking limits
Procurement FAQ
Frequently Asked Questions by Bago Electrical Buyers
Practical answers to help panel builders, M&E contractors, and hardware importers optimize their supply chain.
What are the key technical criteria for specifying an AC surge protector in Bago's humid, lightning-prone environment?
In Bago, two factors are critical: Maximum Continuous Operating Voltage (Uc) and thermal disconnection speed. Because local grid voltage regularly surges due to unbalanced loads and inductive switching, selecting an SPD with an insufficient Uc (e.g., 275V on an unstable 230V line) will cause premature MOV degradation. We recommend specifying a Uc of at least 385V to 420V AC for 230/400V systems. Furthermore, our units feature internal thermal cut-offs with arc-shield barriers that safely disconnect the MOV module in case of end-of-life thermal runaway, preventing fire risks in high ambient humidity switchgear.
How does Zhejiang Graybar manage sample testing and minimum order quantities for Myanmar distributors?
We understand that local engineers and contractors must verify physical build quality, terminal torque strength, and trip curve accuracy before committing to large volumes. Therefore, our standard MCB, MCCB, and SPD product lines feature a low evaluation MOQ of only 5 units per rating, while large-frame Air Circuit Breakers (ACBs) can be ordered from a single unit (1 pc). We coordinate expedited air sample dispatch or consolidated LCL sea freight directly to Yangon or border clearing routes.
Why is a 4-pole (4P) configuration strongly advised over a 3-pole (3P) configuration for ATS and MCCB installations in Bago?
In many areas across Bago, four-wire distribution grids (TN-S or TT earthing systems) experience severe phase unbalance and high third-harmonic neutral currents from single-phase loads. If an automatic transfer switch switches only the three active phase lines while leaving the neutral solidly connected to both the incoming utility and the standby generator, circulating zero-sequence currents can trigger false ground fault trips or cause lethal voltage floating on neutral conductors. Graybar's 4-Pole ATS and 4-Pole MCCBs switch the neutral conductor simultaneously, ensuring complete isolation and protection of personnel and equipment.
Can Graybar produce private-label, OEM-branded circuit breakers and surge protective devices?
Yes. A large share of our factory production supplies regional brands across Asia and the Middle East. We offer comprehensive OEM/ODM services: including high-precision laser printing of your brand logo, custom model designations, customized tripping curve labels, individual retail color box design, and master carton packaging. Full technical documentation and compliance sheets are tailored to support your local electrical project bidding.
What coordinated backup fuse or breaker rating is necessary before the SPD module?
According to IEC 61643-11 installation rules, every surge protective device must be equipped with an upstream short-circuit back-up protection device (SCPD)—typically a specialized backup fuse or a C-curve MCB (such as our 32A to 63A miniature breakers). This ensures that if a catastrophic surge exceeds the SPD’s maximum discharge capacity (Imax), the upstream MCB/fuse isolates the faulted branch within milliseconds, keeping the main distribution busbar energized without interrupting the facility's power supply.
Connect Directly With Our Factory Engineering Team
Whether you require single-line diagram consultation, custom breaking ratings, or bulk container pricing for regional distribution in Bago, our sales engineers are ready to support your technical specifications.
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