Thermal Magnetic
Mutai 3P 80A/100A Thermal Magnetic Circuit Breaker 415V 35kA
- Poles / Rated Current:3P / 80A - 100A
- Breaking Capacity:35kA @ 415VAC
- Frequency:50/60 Hz Dual
- Compliance:IEC 60947-2
Export-Grade Electrical Protection & Switching
Engineered Low-Voltage Solutions for Industrial & Infrastructure Projects
From compact DIN-rail modular contactors and DC photovoltaic protection to high-capacity industrial changeover systems, explore our heavy-duty switchgear built to withstand severe voltage fluctuations and extreme ambient heat across Iranian provinces.
Solar PV Protection
2P 80A–125A DC MCB 500V Photovoltaic Circuit Breaker C-Curve
- Poles / Rated Current:2P / 80A, 100A, 125A
- Rated DC Voltage:500V DC String
- Trip Characteristic:C-Curve Magnetic
- Arc Quenching:Permanent Magnetic
Dual Power ATS
ATS PC 3-Phase 4P 63A 400V 5kA Automatic Transfer Switch
- Poles / Rated Current:4P / 63A Continuous
- Voltage Rating:400VAC (Line-to-Line)
- Switching Speed:< 50 ms Fast Transition
- Application:Genset / Grid Automation
Manual Changeover
4P 63A Manual Changeover Switch with Overload Protection ATS
- Configuration:4-Pole Dual Incomer
- Thermal Protection:Integrated Bimetal Strip
- Mounting Type:Standard 35mm DIN-Rail
- Target Sectors:Commercial & Workshop
Type 1 PV Arrester
Fireproof T1 PBT 800V DC SPD 2P 40kA PV Surge Protective Device
- Operating Voltage:800V DC PV System
- Max Discharge (Imax):40kA (8/20μs wave)
- Housing Material:Flame-Retardant PBT UL94-V0
- Standard:IEC 61643-31 / T1 Class
Heavy-Duty Transfer
DIN Rail ATS Dual Power 4P 100A/125A 3-Phase PC Type 400V
- Poles / Current:4P / 100A & 125A Rated
- Isolation Voltage:Ui 690V / Uimp 8kV
- Classification:PC Class (Non-Tripping)
- Operating Life:8,000 Electrical Cycles
Residual Current RCBO
DZ30LE-32A Compact RCBO Circuit Protection System 1P+N
- Rated Current:Up to 32A DIN-Mount
- Residual Tripping:30mA Instantaneous A/AC
- Poles:1P+N in 18mm Module
- Deployment:Hotels, Malls & Public Lighting
Telemetry & Modbus
HY-311-80VY 0.5 Class 3-Phase Energy Meter RS485 Modbus
- Accuracy Class:Class 0.5 Active Energy
- Voltage Input:AC/DC 60V - 280V Wide
- Communication:RS485 RTU Modbus Protocol
- Measurements:V, I, kW, kVA, PF, Harmonics
Industry Whitepaper & Technical Analysis
Modular Contactor Engineering: Bridging Low-Noise Automation and Harsh Grids
Understanding the mechanical, metallurgical, and thermal constraints of DIN-rail modular contactors engineered for Middle Eastern industrial networks and commercial infrastructure.
In low-voltage electrical distribution, the modular contactor (DIN-rail contactor) has evolved from a simple lighting relay into an indispensable electromechanical switching apparatus. While conventional heavy industrial contactors comply primarily with IEC 60947-4-1 and are designed for dirty factory environments with tolerated electromagnetic acoustic hum, modern commercial buildings, luxury residences in Tehran, hospital surgical complexes, and automated distribution boxes (Tablo Khaneh) mandate absolute compliance with IEC 61095 (electromechanical contactors for household and similar purposes).
Exporting modular contactors to Iran presents unique engineering hurdles. The Iranian national transmission and distribution grid—supervised by TAVANIR—experiences significant summer load stress due to extensive air conditioning utilization in central and southern regions (Khuzestan, Bushehr, Fars, Yazd). Voltage fluctuations ranging between −15% and +10% of nominal 230V/400V 50Hz, coupled with severe harmonic distortion from non-linear industrial loads, require modular contactors to possess resilient magnetic coil designs, superior arc-quenching chambers, and high-purity silver-alloy contacts capable of handling up to 100,000 full-load electrical cycles without contact welding.
Hum-Free DC Rectified Coils
Standard AC contactor coils exhibit a 50Hz/100Hz magnetostrictive hum caused by alternating flux crossing zero. Graybar’s modular contactors integrate an internal bridge rectifier with internal filtering. Whether fed with 220VAC or 24VDC, the internal electromagnetic armature operates purely on direct current, yielding silent operation (≤ 15dB acoustic footprint) essential for hotels, residential distribution boards, and medical institutions.
AgSnO2 Weld-Resistant Contacts
Traditional electrical contacts utilize silver cadmium oxide (AgCdO), which suffers from environmental toxicity and vulnerability to electrical erosion during inrush current spikes (LED driver banks, motor starting). Our contactors utilize sintered Silver Tin Oxide (AgSnO2 90/10), delivering outstanding arc erosion resistance and thermal dissipation during high-frequency AC-7a and AC-7b duty cycles up to 100A continuous rating.
Thermal De-Rating & Climatic Shielding
Iranian summer temperatures in southern industrial hubs regularly exceed 50°C outside ambient, translating to >65°C inside sealed IP65 enclosures. Our modular contactors utilize reinforced engineering plastics rated UL94-V0 with a Glow Wire Flammability Index (GWFI) of 960°C. We provide exact thermal spacing guidelines and auxiliary ventilation spacer modules (9mm width) to preserve contact life under uninterrupted thermal stress.
Target Application Scenarios
Where Graybar Modular Contactors Excel Across Iran
Tailored electromechanical solutions addressing specific regional industrial requirements, urban infrastructure upgrades, and harsh climate realities from Tabriz to Bandar Abbas.
Tablo Sazi (Panel Building)
Supplied to licensed Iranian switchboard builders in Tehran (Khavaran, Shamsabad), Karaj, and Isfahan. Our compact 18mm (1P/2P) and 36mm/54mm (3P/4P) contactors fit into standard modular DIN-rail cutouts alongside MCBs and RCDs without requiring bespoke mounting brackets.
HVAC & Chiller Sequencing
Commercial malls, administrative buildings, and luxury apartments across Mashhad, Shiraz, and Kish Island depend on central VRF and water-cooled chiller plants. Modular contactors handle heavy compressor and condenser fan cycling under AC-7b loads without coil burnout or terminal carbonization.
Agricultural Solar Pumping
Arid farming plains in Kerman, Fars, and Khorasan are adopting solar-powered deep-well borehole pumps. Paired with our 500V/800V DC circuit breakers and SPDs, modular contactors execute automated grid-to-PV inverter changeover sequences remotely via smart Modbus energy meters.
Oil & Gas Petrochem Utilities
In auxiliary distribution rooms and non-hazardous substation shelters within Asaluyeh, Mahshahr, and Abadan refinery complexes, our contactors provide continuous lighting, ventilation, and emergency power bus switching with anti-vibration screw clamping and high impulse ratings.
Comprehensive Engineering Parameters
Modular Contactor Technical Specification & De-Rating Matrix
Engineers and electrical wholesalers in Lalehzar can reference the matrix below to calculate exact load handling capacities across resistive (AC-1/AC-7a) and inductive motor (AC-3/AC-7b) operational categories.
| Model Series | Poles Configuration | Rated Current (AC-7a / Resistive) | Motor Rating (AC-7b / Inductive) | DIN Width (Modules) | Coil Voltage Options | Electrical Endurance | Mechanical Life |
|---|---|---|---|---|---|---|---|
| GYC-16M | 1P, 2P (1NO, 2NO, 1NO+1NC) | 16A @ 250VAC | 9A / 1.5 kW | 1 Module (18mm) | 24V, 110V, 220-240V AC/DC | 150,000 operations | 1,000,000 cycles |
| GYC-20M | 1P, 2P, 4P (2NO, 4NO, 2NO+2NC) | 20A @ 250/400VAC | 9A / 1.8 kW | 18mm (2P) / 36mm (4P) | 24V, 110V, 220-240V AC/DC | 150,000 operations | 1,000,000 cycles |
| GYC-25M | 2P, 4P (2NO, 4NO, 3NO+1NC) | 25A @ 250/400VAC | 14A / 3.0 kW | 18mm (2P) / 36mm (4P) | 12V, 24V, 220-240V AC/DC | 120,000 operations | 1,000,000 cycles |
| GYC-40M | 2P, 3P, 4P (2NO, 3NO, 4NO, 2NO+2NC) | 40A @ 400VAC | 22A / 7.5 kW | 36mm (2P) / 54mm (4P) | 24V, 110V, 220-240V AC/DC | 100,000 operations | 800,000 cycles |
| GYC-63M | 2P, 3P, 4P (2NO, 4NO, 4NC) | 63A @ 400VAC | 30A / 15.0 kW | 36mm (2P) / 54mm (4P) | 24V, 110V, 220-240V AC/DC | 100,000 operations | 800,000 cycles |
| GYC-100M | 2P, 4P (2NO, 4NO) | 100A @ 400VAC | 45A / 22.0 kW | 54mm (2P) / 108mm (4P) | 24V, 110V, 220-240V AC/DC | 80,000 operations | 500,000 cycles |
*Thermal Derating Note for Iranian Hot-Zone Installations: When ambient temperatures exceed 40°C inside the electrical switchboard, a derating multiplier of 0.85 must be applied at 50°C and 0.70 at 60°C. Alternatively, inserting an aicc-ventilation spacer (9mm) for every two adjacent modular contactors restores 100% nominal rated thermal performance without derating.
100,000+
AC-7a Electrical Cycles
≤ 15 dB
Silent DC Hum Noise
5000 V
Dielectric Withstand Test
100%
Traceable Silver Alloys
Trade Capacity & Corridor Security
Streamlined B2B Sourcing from China to Iran
We eliminate export friction for Iranian importers, Lalehzar wholesalers, and engineering procurement firms through established logistical corridors and clear financial execution channels.
Multimodal Logistics to Bandar Abbas
Direct maritime containerized shipments departing Ningbo or Shanghai Port to Bandar Abbas (Shahid Rajaee Port) with typical transit times of 18–24 days. For urgent engineering orders, air freight is coordinated directly to Tehran Imam Khomeini International Airport (IKA). All packaging utilizes 5-ply reinforced honeycomb cartons with interior polybags and desiccants to resist maritime humidity during Persian Gulf transshipment.
Flexible Currency & Settlement Pathways
We accommodate practical B2B settlement mechanisms familiar to the Iranian electrical business community. We support direct Renminbi (RMB / CNH) transfers through Chinese domestic banking partners, certified third-party escrow settlement companies in Dubai (UAE), and Kunlun Bank compliant documentation. Proforma invoices (PI) and commercial documents are accurately issued to match Iran customs declaration protocols.
Customs Verification & ISIRI Alignment
The Institute of Standards and Industrial Research of Iran (ISIRI) bases its low-voltage switchgear directives directly on international IEC standards. Every batch of our modular contactors, MCCBs, and SPDs is issued with certified Factory Acceptance Test (FAT) reports, Certificate of Origin (CO), and formal IEC conformity declarations (IEC 61095, IEC 60947-4-1) ensuring seamless clearance through Iranian customs without arbitrary inspection delays.
Manufacturing Authority • Liushi Town, Wenzhou
Zhejiang Graybar Electric Co., Ltd. Company Strengths
Headquartered in Liushi Town—the undisputed low-voltage electrical capital of China—our integrated facility unites design, injection moulding, precision stamping, and automated assembly under an ISO9001 quality management framework.
In-House Manufacturing Depth
- Precision copper terminal stamping and silver-tip induction brazing.
- Automated high-speed coil winding with Class H (180°C) enameled wire.
- Custom thermoset & thermoplastic tooling producing UL94-V0 flammability enclosures.
100% Quality Screening Protocol
- 100% automated pick-and-drop voltage pull-in and drop-out calibration.
- Dielectric breakdown insulation verification at 2,500V – 5,000V AC.
- Contact resistance testing under dynamic operational loads to prevent hot-spot degradation.
OEM / ODM & Private Label Support
- High-resolution optical laser marking for Persian/English distributor brands.
- Customized packaging graphics, master carton barcoding, and multilingual user guides.
- Low initial sample MOQs (as low as 5 pcs for test panels) before commercial container orders.
Knowledge Center & Buyer Support
Frequently Asked Questions for Iranian Importers & Engineers
Direct engineering and commercial answers to the practical questions raised by panel builders, project contractors, and trading merchants across Iran.
What is the functional difference between an industrial contactor (IEC 60947-4-1) and a modular contactor (IEC 61095)?
While both devices perform electromagnetic switching, industrial contactors are designed for motor control centers inside dedicated electrical rooms where acoustic noise, large footprint, and screw-mounting baseplates are standard. Modular contactors are built explicitly for standard 35mm DIN-rail distribution boards (consumer units). They feature a uniform 18mm/module form-factor, finger-safe IP20 terminals, silent DC-rectified coils with zero vibration hum, and are tested under IEC 61095 specifically for household, hotel, office, and hospital automation where human occupancy requires absolute silence and standardized modular aesthetics.
How do Graybar modular contactors cope with high altitude in Tehran (1,200m to 1,800m above sea level)?
High altitudes reduce air density, which impairs thermal convection cooling and dielectric arc quenching capability. Standard IEC 61095 testing assumes installations up to 2,000 meters. Because Tehran, Tabriz, and Isfahan sit between 1,200m and 1,800m above sea level, Graybar modular contactors operate within 100% rated parameters without needing dielectric or thermal derating below 2,000m. For installations exceeding 2,000m (such as mountainous telecommunications relay towers in the Alborz or Zagros mountains), we recommend a 5% voltage derating and the insertion of a 9mm thermal isolation spacer module.
Can the coil tolerate grid voltage sags (−20%) and surges (+15%) common during peak Iranian summer months?
Yes. Conventional AC-coil contactors often drop out or chatter when voltage drops below 85% of nominal Us, resulting in burned contacts and destroyed motors. Graybar modular contactors incorporate an electronic wide-voltage rectifier circuit. The contactor reliably pulls in between 85% and 110% of rated voltage, and maintains positive, chatter-free contact closure down to 75% Us. Furthermore, the electronic board includes transient voltage suppression (TVS) to absorb voltage spikes induced by lightning or inductive switching on unconditioned grid lines.
What is your Minimum Order Quantity (MOQ) and sample policy for prospective Iranian distributors?
We actively support market trial and product qualification. For standard modular contactor ratings (16A, 20A, 25A, 40A, 63A), our MOQ starts at just 5 pieces per specification so electrical engineers and panel builders can inspect mechanical finish, terminal torque tolerance, and acoustic silence on trial project switchboards. For customized OEM private branding (Persian/English laser marking, custom box printing), our standard production MOQ is 500 pieces per frame size, with full graphic design support included.
How are orders shipped and what documentation is provided to clear Iranian Customs?
Orders are consolidated at our Wenzhou/Ningbo warehouse and shipped via FCL (Full Container Load) or LCL (Less than Container Load) directly to Shahid Rajaee Port (Bandar Abbas) or via air freight to IKA Tehran. We provide a complete export documentation suite: Commercial Invoice, Packing List, Original Bill of Lading, Certificate of Origin (CCPIT certified if required), and Factory Type Test Reports aligned with IEC 61095 and IEC 60947. We also accommodate custom shipping marks and Harmonized System (HS) code alignment (typically 8536.49.00) to ensure smooth customs valuation and tariff classification.
Accelerate Your Electrical Supply Chain with Direct Factory Pricing
Connect directly with Zhejiang Graybar Electric’s export engineering department in Liushi. Whether you need full single-line diagram consultation, customized Persian-branded modular contactors, or certified sample shipments for your upcoming infrastructure tender, our dedicated team is ready to assist.