Product Short Description
Product Brief Introduction
Industrial AC electromagnetic contactor designed for switching three-phase asynchronous motors, certified for global low-voltage industrial control systems, compliant with IEC 60947-4-1 and JIS C 8201 standards. Unit code 3A1B defines contact configuration: 3 Normally Open main power poles, 1 Normally Open auxiliary contact, 1 Normally Closed auxiliary contact.
Description
Technical Specifications
- Rated Insulation Voltage (Ui): 690 V AC
- Rated Operational Voltage (Ue): 400 V AC three-phase
- Rated Operational Current (Ie): 42 A AC-3 duty
- Auxiliary Contact Rating: 6 A / 250 V AC
- Coil Standard Voltage Options: 24 VAC, 48 VAC, 110 VAC, 220 VAC, 380 VAC
- Mechanical Service Life: 10,000,000 operations
- Electrical Service Life (AC-3): 1,200,000 operations
- Operating Frequency Max: 3,600 cycles per hour
- Ambient Operating Temperature Range: -25 °C to +60 °C
- Storage Temperature Range: -40 °C to +70 °C
- Protection Class: IP20 for front panel assembly
Functional Features
- Integrated arc extinguishing chamber with ceramic arc barrier for rapid arc quenching
- Built-in anti-wear silver alloy contact tips with high fusion resistance
- Silent electromagnetic coil with copper wound core, low power consumption during hold state
- Standard DIN rail mounting compatible with global 35 mm rail standards
- Interlock mechanical interface for dual contactor reversing motor circuits
- Clear visual contact status indicator window on front housing
Material Composition
- Main Housing: Flame-retardant reinforced thermoplastic UL94-V0
- Contact Tip: Silver cadmium oxide alloy (AgCdO)
- Electromagnetic Core: Laminated silicon cold-rolled steel sheet
- Coil Winding: Pure oxygen-free copper enamel wire
- Arc Chamber Insulator: High-temperature resistant alumina ceramic
Structural Characteristics
- Modular split housing structure for easy coil and auxiliary contact replacement
- Vertical stacked main pole layout for compact cabinet footprint
- Screw-type terminal lugs with lock washers to prevent wire loosening under vibration
- Dedicated mechanical interlock slot on upper housing edge
Working Principle
Alternating current energizes the electromagnetic coil to generate alternating magnetic flux; magnetic attraction pulls the movable iron core assembly downward, closing all main and auxiliary contact circuits. When coil power cuts off, built-in return spring pushes the movable core upward to disconnect all conductive paths and extinguish internal electric arcs via ceramic arc barriers.
Advantage Highlights
- Low coil holding power reduces continuous operational energy loss
- Vibration-resistant structure for heavy machinery workshop environments
- Global standard certification enables cross-region equipment export
- Replaceable coil and auxiliary contact assemblies cut maintenance replacement costs
- Wide ambient temperature tolerance without performance derating
Applicable Industries
Factory automation assembly lines, HVAC motor control, water treatment pump stations, material conveyor systems, packaging machinery, metallurgy auxiliary motor drives, construction lifting equipment
Installation Requirements
- Mount vertically within ±15° angular tolerance on 35 mm standard DIN rail
- Maintain minimum 10 mm vertical clearance above and below unit for heat dissipation
- Torque power terminal screws to 2.5 N·m; auxiliary terminal screws to 1.2 N·m
- Separate contactor cabinet from high-frequency welding or arc welding equipment by minimum 500 mm distance
Usage Precautions
- Do not operate at current exceeding 42 A AC-3 rating without derating calculation
- Prevent dust, conductive metal shavings and liquid moisture ingress into arc chamber
- Avoid mounting in direct sunlight with sustained surface temperature over 60 °C
- Match coil voltage strictly to control circuit supply voltage; mismatched voltage causes coil burnout
- Conduct quarterly inspection of contact tip wear for high-cycle heavy-load applications
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