Mutai 3P 80A/100A Thermal Magnetic Circuit Breaker 415V 35kA
- Poles3P
- Rated Current80A / 100A
- Breaking Capacity35kA @ 415V
- CoordinationType-2 Contactor Feed
500,000+
Monthly Switch Capacity
IEC 60947
Full Standard Compliance
< 15 ms
Ultra-Fast Contact Opening
10M Ops
Mechanical Service Life
Direct Factory Catalog
Featured Industrial Protection & Switching Products
Engineered for seamless coordination with our motor contactors, motor control centers (MCC), and industrial switchboards.
Waterproof 500V DC 100A Moulded Case Circuit Breaker (MCCB)
- Rated Voltage500V DC
- Rated Current100A
- EnclosureIP66 Waterproof Case
- ApplicationSolar, BESS, DC Motors
4P 63A Manual Changeover Switch Transfer Breaker ATS
- Configuration4 Pole (3P+N)
- Current Rating63A
- MechanismDual Interlock Breaker
- Use CaseUtility / Gen Transfer
40A/63A 220V DIN Rail Adjustable Over/Under Voltage Protector
- Operational Range140V - 300V AC
- Max Throughput30 kVA
- MountingStandard 35mm DIN Rail
- Recovery ModeAuto Reconnect Delay
Dual Power Automatic Transfer Switch (ATS) 63A/100A DIN Rail
- Frame Ratings10A to 125A
- Transfer Time< 50 ms (Millisecond)
- Poles2P / 3P / 4P
- StandardIEC 60947-6-1
2P 63A 230V Intelligent 6-in-1 Auto-Reconnect Protector
- Protection Multi-setVolt / Current / Leakage
- Frequency50/60Hz Adaptive
- DisplayDual Digital LED Voltmeter
- Surge WithstandClass II / 6kVA
Heavy-Duty 4P 63A Dual Source Manual Changeover Breaker
- Dielectric Strength2.5kV 1min
- Endurance8,500 Operating Cycles
- Housing MaterialSelf-Extinguishing V0
- TerminalTunnel Clamp up to 25mm²
DZ30LE-32A Compact Residual Current Breaker with Overcurrent
- Module Width18mm (1P+N Compact)
- Rated InUp to 32A
- Tripping Sensitivity30mA Instantaneous
- ComplianceIEC 61009-1
Technical Authority White Paper
Engineering Foundations: Industrial AC & DC Motor Contactor Mechanics
A rigorous examination of electromagnetic dynamics, contact bridge metallurgy, and Type-2 short circuit coordination.
In high-demand industrial automation, motor control centers (MCC), mining installations, and commercial HVAC equipment, the electric motor contactor serves as the principal electromechanical actuation interface. Unlike general-purpose isolation switches or miniature circuit breakers designed solely for static overload and dead-fault interruption, an industrial contactor must endure severe repetitive inductive load switching. Motor inrush currents regularly reach six to ten times the motor's full load amperage (FLA) under AC-3 or AC-4 duty cycles, requiring exceptional thermal management, arc suppression mechanics, and contact material integrity.
Advanced Arc Chute & De-Ion Plates
Upon contact separation under full inductive load, an electrical arc forms across air gaps. Our contactors utilize multi-vane, copper-plated steel de-ionizing splitter plates. Lorentz forces draw the arc rapidly away from contact tips into quenching chambers, subdividing and cooling the plasma within 8 to 12 milliseconds to prevent re-ignition.
AgSnO₂ Contact Metallurgy
Graybar incorporates high-density Silver Tin Oxide (AgSnO₂) contacts manufactured via vacuum sintering. Compared to conventional Silver Cadmium (AgCdO) alloys, AgSnO₂ provides superior anti-welding characteristics under severe inrush currents, exceptional material transfer resistance, and complete RoHS and REACH environmental compliance.
Low-Bounce Electromagnetic Coils
Electromechanical bounce during contact closing is the primary cause of contact erosion and premature welding. Precision-ground core pole faces, optimized shading coils for AC excitations, and calibrated spring kinematics reduce initial contact chatter to below 1.5 milliseconds, dramatically extending electrical endurance.
Mastering IEC 60947-4-1: Type 1 vs. Type 2 Motor Starter Coordination
When engineering motor branches, specifying the contactor in isolation is a high-risk oversight. Global EPC contractors and panel builders must design the complete motor feeder loop comprising a short-circuit protective device (MCCB or fast-acting fuse), an electromagnetic contactor, and a thermal or electronic overload relay according to IEC 60947-4-1 guidelines:
Type 1 Coordination Criteria
Under a short-circuit fault event, the contactor or overload relay may suffer damage. Repair or component replacement is permissible before putting the motor branch back into service. Suitable only for non-critical installations where downtime is acceptable.
Type 2 Coordination (Graybar Engineered Standard)
Under short-circuit conditions, no damage to the contactor or overload relay is permitted. Light contact tacking is permissible only if contacts can be easily separated by a manual inspection screwdriver without part deformation. Essential for critical industrial plants, data centers, and hospital pumps.
Specifier Data Sheet
Standard Industrial AC Contactor Specification Matrix
Comprehensive ratings, coil characteristics, and breaking capacities for industrial engineering selection.
| Model Series | Rated Current (AC-3 400V) | Motor Power (kW @ 400V) | Thermal Current (Ith / AC-1) | Coil Pick-Up / Hold-In VA | Auxiliary Contacts | Electrical Life (Ops) |
|---|---|---|---|---|---|---|
| GBE-09C | 9 A | 4.0 kW | 25 A | 60 VA / 7.5 VA | 1 NO or 1 NC | 1,200,000 |
| GBE-18C | 18 A | 7.5 kW | 32 A | 70 VA / 8.0 VA | 1 NO + 1 NC | 1,200,000 |
| GBE-32C | 32 A | 15.0 kW | 50 A | 90 VA / 9.5 VA | 1 NO + 1 NC | 1,000,000 |
| GBE-65C | 65 A | 30.0 kW | 80 A | 160 VA / 15.0 VA | 1 NO + 1 NC | 800,000 |
| GBE-95C | 95 A | 45.0 kW | 125 A | 200 VA / 18.0 VA | 1 NO + 1 NC | 800,000 |
| GBE-150C | 150 A | 75.0 kW | 200 A | 300 VA / 26.0 VA | 2 NO + 2 NC | 600,000 |
| GBE-225C | 225 A | 110.0 kW | 275 A | 450 VA / 35.0 VA | 2 NO + 2 NC | 600,000 |
Technological Roadmap
Next-Gen Industry Development & Engineering Trends
How digital transformation, wide-band electronic coils, and clean-energy electrification are reshaping contactor manufacturing.
Universal Electronic Coils
Eliminating coil burnout caused by severe brownouts or grid spikes. Microprocessor-governed universal AC/DC coils function reliably across 100V to 250V ranges while slashing hold-in energy consumption by up to 75%.
Solid-State Hybrid Switching
By pairing anti-parallel thyristors (SCR) with standard mechanical contacts, hybrid contactors trigger at zero voltage crossing. Arcing is virtually eliminated during opening and closing, delivering 10x greater operational longevity.
High-Voltage DC Relaying for BESS
Accelerating solar photovoltaic farms, commercial energy storage systems (BESS), and DC hyper-chargers necessitate contactors rated for 1000V DC to 1500V DC with permanent-magnet arc blowout systems and hydrogen-sealed contact chambers.
IoT Edge Telemetry Diagnostics
Modern motor starters integrate plug-and-play auxiliary heads with integrated Modbus-RTU, IO-Link, and Ethernet connectivity. Real-time telemetry monitors contact tip resistance, operations count, coil heat, and voltage dips.
Procurement Intelligence
Future B2B Procurement Trends for Low-Voltage Apparatus
Critical market shifts guiding how Fortune 500 distributors, panel builders, and regional wholesalers optimize their supply chain.
Full-BOM Single-Source Consolidation
Global buyers are abandoning piecemeal vendor models. Consolidating Air Circuit Breakers (ACB), MCCBs, MCBs, SPDs, and Motor Contactors under one certified supplier like Graybar cuts freight volume costs, ensures unified type-test certification compatibility, and simplifies warranty claims.
Private-Label OEM / ODM Localization
Regional switchboard assemblers and electrical brands seek customized laser-marked ratings, branded injection enclosures, specialized coil voltages (e.g., 24V DC, 48V AC, 110V AC, 380V AC), and customized packaging with multilingual schematics for instant market deployment.
Hedging Raw Material Volatility
Copper (magnetic wire) and Silver (contact rivets) represent substantial portions of contactor bill-of-materials costs. Strategic tier-1 manufacturers in Liushi, Wenzhou leverage vertical supply integration to mitigate raw metal spot fluctuations, guaranteeing firm pricing on long-term supply contracts.
Verified Manufacturing Strength
Zhejiang Graybar Electric: Your Strategic Manufacturing Partner
Direct manufacturing excellence from Huangyu Village, Liushi Town, Wenzhou — China's Epicenter of Electrical Innovation.
Precision Production, Vertical Integration & Complete Assurance
Located in Liushi Town, Wenzhou, Zhejiang Graybar Electric Co., Ltd. operates state-of-the-art tooling, automated coil winding, precision robotic stamping, and automated contact-brazing cells. By manufacturing essential components in-house, we maintain absolute quality control over dimensional tolerances, magnetic reluctance, and contact plating purity.
Every production batch undergoes 100% routine testing: coil pull-in/drop-out voltage thresholds, contact synchronicity, dielectric insulation withstand (2.5kV AC), and temperature rise benchmarking under rated full-load currents.
Agile Order Quantities
Standard models start from 5 pcs MOQ; ACBs from 1 pc sample
Global Export Footprint
Serving importers and EPCs across Europe, Americas, Middle East & SEA
Third-Party Authenticated
On-site factory inspection verified by independent inspection agencies
Complete Testing Lab
Equipped with synthetic mechanical and electrical endurance test bays
100%
Routine Batch Testing
Thermal trip verification, contact timing calibration, and high-voltage dielectric isolation completed before export packaging.
Contact Us
Procurement & Engineering Answers
Frequently Asked Questions (FAQ) for Global Buyers
Detailed technical, commercial, and logistical clarifications for electrical engineers and purchasing managers.
What is the operational difference between AC-1 and AC-3 contactor utilization categories? +
Per IEC 60947-4-1, AC-1 applies to non-inductive or slightly inductive loads, such as resistance heaters, furnaces, and general distribution boards (power factor cos φ ≥ 0.95). In AC-1 applications, the current is switched without severe inrush or braking counter-EMF. Conversely, AC-3 covers typical squirrel-cage induction motors where the contactor closes against a starting current 5 to 7 times normal full load amperage (FLA) and breaks current while the motor is operating at rated speed. Choosing an AC-1 rated contactor for an AC-3 motor application will cause contact overheating, catastrophic contact tip welding, and rapid failure.
How does ambient temperature inside a control panel de-rate contactor current capacity? +
Standard contactor ratings are calibrated for an ambient operating temperature of 40°C around the device. When contactors are mounted in dense, unventilated enclosures where internal temperatures reach 55°C or 65°C, thermal dissipation from the main contacts and coil is significantly reduced. To prevent insulation degradation and nuisance thermal overload tripping, engineers must apply de-rating factors (typically 0.85 to 0.90 of nominal current rating at 60°C) or specify the next larger contactor frame size.
Can Zhejiang Graybar Electric provide customized coil voltages and frequencies? +
Yes. We supply wide-ranging control coil options to accommodate diverse regional standards and control circuits: 24V AC, 48V AC, 110V AC, 220V/230V AC, 380V/400V AC, and 415V AC across both 50Hz and 60Hz. We also manufacture pure DC-actuated coils (12V DC, 24V DC, 48V DC, 110V DC, 220V DC) equipped with suppression diodes or electronic control modules for silent, hum-free operation in noise-sensitive marine, elevator, and hospital control rooms.
What minimum order quantities (MOQ) and production lead times apply for OEM contracts? +
For standard factory models, our starting MOQ is exceptionally low: just 5 pieces for standard MCB, MCCB, and contactor lines, and 1 piece for heavy Air Circuit Breakers (ACB) to facilitate client qualification testing. For bespoke OEM/ODM private-label orders (custom logo laser-marking, customized packaging, and specific coil configurations), the typical MOQ is 100 to 500 units depending on the frame size. Production lead times generally range between 15 to 25 calendar days, supported by our buffer inventory of raw materials in Liushi Town.
How do contactor auxiliary contacts interface with industrial PLC control systems? +
Graybar contactors support mechanically linked auxiliary contact blocks (Normally Open / Normally Closed) designed in compliance with IEC 60947-5-1 Annex L. These contacts provide positive status feedback into PLC digital input cards for monitoring interlocks, trip alarms, and automation sequencing. For low-level electronic signals (below 24V DC, 10mA), we supply bifurcated auxiliary contacts with gold flash plating to ensure low contact resistance and zero signal dropout in harsh, dusty atmospheres.
What type of documentation and test reports accompany B2B export shipments? +
Every commercial shipment includes Certificate of Conformity (CoC), routine factory inspection reports, Bill of Lading, Packing List, and Commercial Invoice. On request, we provide third-party type test reports referencing IEC 60898-1, IEC 60947-2, IEC 60947-4-1, and IEC 61643-11, alongside Certificate of Origin documentation (Form A, Form E, or RCEP) to help our international buyers obtain preferential import tariff clearance.
Request Custom Quotations & Technical Datasheets
Consult directly with our switchgear and motor control application engineers. Whether you need container-load FOB pricing, private-label OEM development, or project BOM verification, we deliver fast, professional engineering support.