100kA
Ultimate Breaking Capacity (Icu)
5 Pcs
Low MOQ for Trial Verification
IEC 60947-2
Strict Harmonized Standard
50°C
Calibrated High-Ambient Endurance
Dual Power Transfer Switch ATS Three Phase 63A - 125A
- Rated Current63A - 125A
- Poles3-Phase (3P/4P)
- StandardIEC 60947-6-1
Dual Power Automatic Transfer Switch ZTQ3-100A/4P
- Rated Current100A
- Poles4-Pole Fully Isolated
- ApplicationGrid-Generator Switching
Electrical AC Magnetic Contactor 50Hz CJX2-8011
- Main Circuit3 Phase / 3 Poles
- MountingStandard DIN Rail Mount
- Design StandardIEC 60947-4-1
Molded Case Circuit Breaker Thermal-Magnetic 50kA/100kA
- Breaking Cap.50kA / 100kA
- Voltage690VAC / 400VAC
- Trip UnitAdjustable Thermal-Mag
Customizable 2P/4P Manual Conversion ATS 125A Frame
- Breaking Cap.10kA
- Frame Current125A Current Frame
- Poles2-Pole / 4-Pole Config
3P 80A - 100A Thermal Magnetic MCCB 415V 35kA
- Rated Current80A / 100 Amp
- Breaking Cap.35kA at 415V 50/60Hz
- DistributionFeeder & Panel Protection
2P 80A-125A DC MCB 500V Photovoltaic Main Switch
- Voltage500V DC Nominal
- CurveC Curve Photovoltaic
- ApplicationSolar String & Battery
2P Single Phase Automatic Transfer Switch 220V 63A
- Frame Current63A Frame
- Breaking Cap.6kA Industrial Grade
- System220V Single-Phase Backup
Engineering Precision: Demystifying Adjustable MCCB Architecture for Iranian Industrial Grids
In modern low-voltage power distribution, fixed-trip protection units frequently fail to meet the exact operational thresholds demanded by dynamic industrial loads. As a specialized Adjustable MCCB Manufacturer & Exporters for Shiraz, Zhejiang Graybar Electric provides engineered Moulded Case Circuit Breakers equipped with dual-adjustment micro-mechanisms: adjustable thermal overload protection (typically $0.7 - 1.0 \times I_n$) and magnetic short-circuit instantaneous pickups ($5 - 10 \times I_n$). This adjustable architecture allows electrical engineers, switchgear builders, and industrial plant managers across Fars Province to tailor tripping curves directly to site conditions without unbolting or replacing breaker units.
The core of our MCCB design integrates arc-chute extinguishing chambers built from de-ion plates optimized for rapid thermal dissipation, high-grade electrolytic copper conducting paths, and silver-nickel alloy contact buttons ($AgNi$). Under severe short-circuit stresses—common in large petrochemical distribution networks or municipal water pumping substations—the magnetic repulsion forces rapidly separate the main contacts, forcing electrical arcs into the arc splitter plates within milliseconds. The result is a certified ultimate breaking capacity ($I_{cu}$) ranging up to 100kA at 400/415V AC, perfectly complying with IEC 60947-2 and regional safety criteria.
Thermal-Magnetic Versatility
Bimetallic thermal strips respond predictably to prolonged overcurrents, calibrated against ambient temperature fluctuations, while adjustable electromagnetic solenoids trigger instant clearance during line faults.
Full Selective Coordination
Enables accurate downstream coordination with DIN rail MCBs and upstream integration with Air Circuit Breakers (ACB), preventing complete plant blackouts during localized short circuits.
Arc Quenching Durability
Reinforced thermoset polyester housings offer high comparative tracking index (CTI) ratings, eliminating phase-to-phase flashovers under high harmonic stress and heavy dust accumulation.
Localized Industrial Applications Across Shiraz and Fars Province
Shiraz serves as the economic, manufacturing, and technological heart of southern Iran. The local operating environment presents severe challenges for electrical switchboards: extreme summer heat with ambient substation temperatures frequently exceeding 45°C, high dust loads from arid topography, and cyclical line voltage sags caused by long-distance transmission lines. Our adjustable MCCB series, contactors, and transfer switches are specifically deployed across Shiraz’s primary industrial sectors:
Petrochemical & Refinery Complexes
In Shiraz Petrochemical Complex facilities and downstream chemical parks, non-sparking reliability and tight selective coordination are critical. Our 100kA frame MCCBs safeguard heavy pumps and exothermic reactors against electrical fires.
Shiraz Special Economic Zone (SEEZ)
From precision electronics manufacturing to industrial machinery assembly, factories located in SEEZ require clean power switching, dual-line transfer via ATS units, and compact MCCBs mounted within modular motor control centers (MCC).
Agricultural Processing & Cold Storage
The vast citrus, grape, and grain processing belts of Fars rely on heavy motor loads for refrigeration and deep-well irrigation. Adjustable magnetic tripping eliminates false trips triggered by high motor start-up inrush currents.
Technological & Market Development Trends in Southern Iran's Grid Infrastructure
The modernization of power delivery systems in Iran is accelerating under national directives toward energy conservation and power reliability. Key developmental trends directly shaping switchgear procurement in Shiraz include:
1. Shift Toward Solid-State Electronic Trip Units (Microprocessor-Based MCCB): While traditional thermal-magnetic trip units remain standard due to ruggedness and cost efficiency, engineering procurement contractors (EPCs) across Shiraz are transitioning to digital trip units. These systems incorporate ground fault protection ($I_g$), neutral protection adjustments for severe phase unbalance, and integrated Modbus-RTU / RS485 communication protocols feeding central SCADA networks.
2. Massive Growth in Solar Photovoltaic Ingestion: Fars Province possesses some of the highest solar irradiance indices in the Middle East. With commercial rooftop installations and utility-scale solar parks expanding along the Marvdasht and Shiraz corridors, the demand for DC-rated circuit breakers (such as our 500V to 1000V DC MCB and DC MCCB series) has escalated. These devices feature permanent magnetic blowouts designed to stretch and extinguish high-voltage direct current arcs cleanly.
3. Thermal Derating Compensation: Conventional European-standard switchgear is rated at 30°C or 40°C. In switchrooms throughout southern Iran during summer, unconditioned ambient air easily forces interior panel temperatures past 55°C. Graybar’s MCCBs are built with specialized bimetallic alloys and calibrated against 50°C baseline curves, preventing nuisance trips and eliminating the need for excessive frame oversizing.
Enterprise Advantages: Why Importers & Panel Builders Source from Graybar
Directly situated in Huangyu Village, Liushi Town, Wenzhou—universally recognized as China’s low-voltage electrical capital—Zhejiang Graybar Electric combines vertically integrated manufacturing with seamless international trade logistics.
Liushi Manufacturing Hub
- Immediate access to high-purity silver contact points and specialized arc chute laminations.
- In-house tooling, plastic injection moulding, and automated laser calibration.
- Customized frame currents, trip curves, and private label markings.
Rigorous Multi-Stage QC
- 100% incoming raw material inspection (bimetals, springs, and conductive copper).
- Automated instantaneous and inverse-time thermal trip testing before packaging.
- Dielectric insulation and contact resistance verification per IEC guidelines.
Export Logistics Ready
- Accessible MOQs: 5 pieces for standard MCCB/ATS models, 1 piece for ACBs.
- Reinforced seaworthy, shock-proof cartons with moisture-barrier inner wrapping.
- Consolidated multi-category container loading via Ningbo or Shanghai ports.
OEM & Engineering Support
- Bespoke packaging, neutral export crating, and Persian/English dual documentation.
- Direct engineering review of single-line diagrams (SLD) and panel BOMs.
- Traceable batch inspection test sheets provided for project verification.
Procurement FAQ: What Shiraz Switchgear Builders & Importers Ask Us
How do you calibrate MCCB thermal ratings for Shiraz's high summer temperatures?
Standard breakers calibrated at 30°C or 40°C experience thermal derating in hot climates like Shiraz, leading to premature tripping under standard loads. We offer custom calibration curves preset to a 50°C ambient baseline. Additionally, our sales engineering desk provides exact derating multiplier tables for switchgear designers to accurately size frame ratings without guesswork.
What is the MOQ for custom-branded or private-label MCCBs exported to Iran?
For standard factory-branded models, our minimum order quantity starts at just 5 pieces for MCCBs, SPDs, and ATS units (and 1 piece for heavy Air Circuit Breakers), facilitating prototype testing. For private labeling (OEM) featuring laser-marked logos, custom packaging, and specific ampere calibrations, the typical MOQ is 50 to 100 units per frame size.
Can you provide full compliance test certificates for municipal and utility bidding?
Yes. All Graybar low-voltage components are designed and tested according to internationally harmonized standards: IEC 60947-2 (MCCB & ACB), IEC 60898-1 (MCB), IEC 60947-6-1 (ATS), and IEC 61643-11 (Surge Protective Devices). We provide type-test verification reports, factory calibration certificates, and material conformity sheets required by project consultants and third-party inspectors.
What breaking capacities (Icu / Ics) are recommended for industrial plants in Shiraz?
For sub-distribution boards and standard commercial facilities, 35kA to 50kA at 400VAC is normally sufficient. However, for installations close to 1000kVA+ substation transformers, petrochemical sites, or industrial parks with high fault energies, we recommend selecting our high-capacity MCCB models offering 65kA to 100kA breaking capacity with 100% rated service breaking capacity ($I_{cs} = 100\% I_{cu}$).
How are shipments packaged to prevent transit damage during sea and overland freight?
Our export packing adheres strictly to industrial shipping requirements: each breaker is individually sealed in an anti-static, moisture-barrier polybag, cushioned with high-density EPE foam shock-absorbing inserts, and boxed in corrugated 5-ply cartons. For full pallet and container shipments, items are strapped, shrink-wrapped, and corner-guarded on treated pallets to resist rough overland transit.
Ready to Source High-Performance Adjustable MCCBs for Shiraz?
Submit your single-line diagram (SLD), bill of materials (BOM), or project tender specifications. Our technical engineering and export desk will provide detailed product datasheets, compliance documentation, and competitive factory quotations.
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