Contactor & Breaker

As a professional manufacturer with more than 30 years of experience in the low-voltage electrical appliance industry, we focus on providing global customers with high-quality silver contacts, silver contact riveted components, silver contact welding components, precision red copper stampings brass stampings, and other core components. The following will introduce in detail the technical characteristics of contactors and circuit breakers, the key role of silver contacts, and our professional technical advantages.

1. Contactors: Motor control experts

(1). Working principle:
- Electromagnetic system drives contacts to open and close
- Main contacts carry large current (usually 20-800A)
- Auxiliary contacts are used to control circuits

(2). Core functions:
- Remote start and stop control of motors
- Frequent operation (mechanical life of millions of times)
- Overload protection with thermal relays

(3). Typical applications:
- Industrial motor control
- Air conditioning compressor
- Elevator control system
- Photovoltaic inverter

2. Circuit breakers: Circuit protection guards

(1). Working principle:
- Electromagnetic tripping mechanism operates when overcurrent occurs
- Quick disconnection when a short circuit occurs (<10ms)
- Manual/automatic reset is possible

(2). Protection functions:
- Overload protection
- Short circuit protection
- Leakage protection (additional module)

(3). Typical applications:
- Building a power distribution system
- Industrial control cabinet
- Data center power supply
- New energy power generation system

Technical parameter comparison

1. The key role of silver contacts

As the "heart" component of contactors and circuit breakers, silver contacts directly affect the following core performance:

(1). Electrical performance:
- Contact resistance (high-quality contacts ≤50mΩ)
- Arc suppression capability
- Current carrying capacity

(2). Mechanical properties:
- Anti-welding (no sticking when breaking high current)
- Wear resistance (guaranteeing mechanical life)
- Impact resistance

(3). Reliability indicators:
- Electrical life (up to 100,000 times)
- Environmental adaptability (resistance to sulfidation and oxidation)
- Consistency (batch stability)

2. Silver contact material system

We provide a full range of contact material solutions:

(1) Standard silver alloy series
AgNi10/12: Economical general material
- Nickel content 10-12%
- Hardness HV80-100
- Suitable for loads below 40A

AgSnO₂10/12: Environmentally friendly medium and high load material
- Tin oxide content 10-12%
- Hardness HV90-120
- Strong resistance to arc erosion

(2) Special performance series
- AgW50/60: High wear resistance and high melting point
- Tungsten content 50-60%
- Hardness HV120-150
- Suitable for circuit breaker main contacts
- AgC3/5: Anti-welding type
- Graphite content 3-5%
- Self-lubricating properties
- Used in frequent start-stop situations

(3) Environmentally friendly cadmium-free series
- AgSnO: Replacement for traditional AgCdO
- Tin oxide content 10-12%
- Compliant with RoHS directive
- Anti-welding properties are close to AgCdO
 

Material performance comparison table

1. Silver contact riveting assembly

(1). Technical features:
- Reliable connection between contacts and current-carrying parts (copper/copper alloy)
- Cold riveting process
- Contact resistance ≤100μΩ

(2). Key points of process control:
1. Riveting force control (±5% tolerance)
2. Coaxiality ≤0.05mm
3. 100% conduction test
4. Sampling for tensile test (≥80N)

(3). Typical applications:
- Contactor moving/static contact assembly
- Circuit breaker moving contact
- Switching electrical bridge contact

2. Silver contact welding assembly

(1). Technical advantages:
- Resistance welding: high efficiency, low cost
- Brazing: suitable for connecting dissimilar materials

(2). Quality assurance measures:
- Welding strength test (shear force ≥100N)
- Metallographic analysis of welding interface
- X-ray detection of internal defects

3. Copper/brass stampings

(1). Features of copper stampings:
- Conductivity ≥58MS/m
- Annealing after stamping to eliminate stress
- Surface can be silver/tin plated

(2). Advantages of brass stampings:
- High mechanical strength (H62 hardness ≥120HV)
- Suitable for complex structural parts
- Good cost-effectiveness

(3). Typical products:
- Contactor electromagnetic system core
- Circuit breaker terminal
- Contact support

1. Whole process inspection flow

(1). Raw material inspection:
- Spectral analysis (material composition)
- Hardness test (material state)
- Dimension measurement (wire diameter/strip thickness)

(2). Process control:
- Stamping size sampling (every 30 minutes)
- Contact weight detection (±1% tolerance)
- Welding temperature monitoring (±10℃)

(3). Finished product inspection:
- 100% appearance inspection (automatic optical inspection)
- Sampling:
- Contact resistance test (micro ohmmeter)
- Hardness test (microhardness tester)
- Life test (simulated working conditions)

2. Laboratory testing capabilities

1. Manufacturing capabilities

(1). Equipment cluster:
- 12 high-speed precision punching machines (60-400 times/minute)
- 100 multi-station cold heading machines (accuracy ±0.01mm)
- 10 automated welding production lines

(2). Production capacity:
- Silver contacts: 200,000,000 pieces per month
- Silver contact riveting components: 20 million sets per month
- Silver contact welding components: 20 million sets per month
- Metal stamping parts: 40 million pieces per month

2. Technological innovation

(1). Technology breakthrough:
- Innovative riveting-welding composite process
- Stamping precision improved to ±0.02mm

(2). Material research and development:
- Highly conductive silver tin oxide material (conductivity increased by 15%)
- Environmentally friendly cadmium-free contact alloy

3. Service support

(1). Value-added services:
- Contact failure analysis (equipped with SEM-EDS)
- Cost optimization plan (material substitution suggestion)
- Fast proofing service (3-5 working days)

(2). Industry certification:
- ISO 9001:2015
- IATF 16949
- RoHS/REACH compliance

With 30 years of professional accumulation, we continue to provide the best quality silver contacts, silver contact riveting components, silver contact welding components, and various precision stamping parts to global contactor and circuit breaker manufacturers. From material research and development to process innovation, from precision manufacturing to strict testing, we ensure that every part meets the most stringent industry requirements.