Industrial Relay Contacts

Industrial relay contacts are the conductive parts inside electromechanical relays that make or break the load circuit. Their performance is closely related to the contact material, contact size, switching current, load type and relay structure.

For industrial control relays, the contact material needs to provide a suitable balance between electrical conductivity, resistance to arc erosion, resistance to contact welding and mechanical durability. We manufacture fixed relay contacts and related silver alloy contact parts according to customer drawings and application requirements.

Different relay loads require different electrical contact materials. There is no single material suitable for every relay application.

• Silver Nickel (AgNi) is a common relay contact material for general switching applications. It combines good conductivity with improved resistance to electrical erosion and arcing compared with pure silver.
• Silver Tin Oxide (AgSnO₂) is suitable for applications where higher resistance to contact welding and electrical arc erosion is required. It is often considered for relays that switch loads with higher making or inrush currents.
• Silver-based composite materials can also be used where the contact layer needs to be combined with a copper or copper-alloy base. This construction reduces the amount of silver alloy used while retaining the required contact surface at the switching point.

The final relay contact material should be selected according to the actual load rather than only the nominal relay current.

A relay switching a resistive heater does not place the same demand on the contacts as a relay controlling a motor, solenoid, transformer or lamp load.

For this reason, several operating conditions should be considered when selecting the contact material:

• Rated current and voltage
• AC or DC switching
• Resistive, inductive or capacitive load
• Inrush current
• Switching frequency
• Required electrical life
• Contact pressure and contact geometry

Loads with high inrush current or stronger arcing generally require greater attention to welding resistance and electrical erosion. For moderate industrial switching loads, AgNi and other silver-based materials are commonly considered.

This product is mainly supplied as a fixed electrical contact for relay contact systems.

Fixed contacts are mounted on the stationary conductive part of the relay and work together with the moving contact during switching. The contact head dimensions, silver alloy layer and base structure can be adjusted according to the relay design.

Available dimensions include contact diameters from 1 mm to 14 mm.

For customized projects, contact diameter, thickness, material composition, base material and other dimensions can be manufactured according to drawing requirements.

These contacts are intended for electromechanical relays used in industrial control and electrical switching equipment, such as:

• Industrial control relays
• Interface relays
• Power relays
• Control cabinet relays
• Motor and solenoid control circuits
• Automation equipment
• Industrial switching and interlocking circuits

The contact specification should be confirmed according to the actual electrical load and relay construction.

• Material: Silver copper composite and other silver-based contact materials
• Contact Mode: Fixed contact
• Specification: Diameter 1–14 mm
• Certification: CCC, RoHS, ISO, CE
• Minimum Order: 1,000 pieces
• Transport Package: Carton

Customized relay contacts can be produced according to drawings, samples or specified contact materials.

For a new relay contact project, please provide the contact drawing, material requirement, load current and voltage, AC/DC condition, contact dimensions and order quantity. This information helps determine whether the existing material and contact structure are suitable for the application.

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