Electrical Contacts For Solar Switch
Products Description
Electrical contacts for solar switches are the core conductive and disconnecting components of photovoltaic switches and relays. Through a composite structure of copper-based stamped parts and silver-based contact materials, they achieve reliable switching of DC and AC circuits and are widely used in various relays in photovoltaic inverters, combiner boxes, and energy storage systems. These contacts, through specific material combinations and molding processes, are adapted to the high-voltage, high-frequency disconnection conditions of photovoltaic systems, ensuring long-term stable circuit operation.
Product Core Structure and Material Selection Logic
Three-layer composite contact structure
Moving Contact for PCB Photovoltaic PV Relay adopts a metallurgical combination design of a copper substrate layer + silver alloy working layer + nickel barrier layer, preventing the diffusion of copper elements from the substrate to the silver layer and slowing down the increase in contact resistance.
Stainless steel spring integration
Contacts can be pre-riveted to stainless steel stamped springs, utilizing the high elastic modulus of stainless steel to maintain contact closure pressure while preventing stress relaxation of the Movable Contact for Photovoltaic PV Inverter Relay under long-term high temperatures.
Flat contacts and bimetallic rivets
The bimetallic layer of the State Contact Rivet for PV AC Circuit Relay compensates for differences in thermal expansion.
Metal Forming Process
Copper-Based Spring Stamping
Flat Silver Contacts for PV Power Relay employ a precision progressive die stamping process to process copper strip into springs of specific shapes, ensuring dimensional accuracy and elasticity consistency.
Silver-Based Contact Forming
Silver-based contact blanks for the Flat Bimetallic Rivet for DC Circuit Photovoltaic Relay are prepared using cold heading or stamping processes, followed by surface treatment to improve arc resistance.
Riveting Composite Process
The silver-based contacts are riveted to the copper-based springs, achieving a mechanical and electrical connection and ensuring reliable contact.
Surface Treatment
Depending on requirements, the contacts of the Oxidized Electrical Contact for Solar Relay are silver-plated, tin-plated, or treated with anti-oxidation processes to improve corrosion resistance and conductivity stability.
Application Scenarios
PV Inverter DC Side
Electric Contacts for PV Relay are used as DC input relays in string inverters, carrying string open-circuit voltages of 1000V-1500V.
Energy Storage System HVDC Contactor
Used as a DC contactor between the battery cluster and the PCS, interrupting fault current on the battery side.
PV AC Grid-Connected Side
Contact Brazing for PV Energy Storage DC Contactor is used as an AC relay at the inverter output, meeting the frequent switching requirements of the grid-connected switch.
Combiner Box Intelligent Shutdown
Moving Contact for New Energy Relay is used as a miniature relay inside the module-level fast shutdown device to achieve safe isolation on the DC side.
contact us
If you are developing photovoltaic relays, energy storage relays, or new energy DC switch projects, please submit your drawings or technical requirements. Our engineering team can assist in the material selection, structural optimization, and mass production supply plan development for Electrical Contacts for Solar Switches.
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