What is Copper Part Stamping?
Inside electromagnetic relays, miniature circuit breakers and contactors, a T2 copper stamped bent bracket carries the rated load current as the conductive base. Copper part stamping delivers this bracket with a controlled cross-section and bend quality, so the silver-contact rivet riveted onto it keeps contact resistance and temperature rise inside design limits. Our China factory supplies these conductive brackets to OEM relay, MCB and energy-storage programs with drawing-driven production.
Available Stamping & Bending Processes of Copper Sheet Metal Stamping Bending Parts
Progressive die stamping for high-volume runs
A single copper strip passes through multiple stations that pierce, bend, and form in one continuous pass. This suits relay and MCB brackets ordered in large batches, holding one set of dimensions across the whole run.
Precision bending for angle control
Compound and CNC bending set bracket angles with repeatable results and compensate for springback. The bend stays free of cracks, so the bracket keeps its shape when loaded into the housing.
In-mold punching and tapping
Thread holes and mounting holes are produced inside the die at stamping speed, removing a separate machining step. Confirm thread size, depth and position in the drawing.
Process selection by part complexity
Flat simple parts use single-step or compound tooling; complex brackets with bends, holes and seats move to progressive dies. Tooling choice follows the part geometry and the target volume.
Application & Compatibility of Copper Sheet Stamping for Electric Relay
Electromagnetic relay conductive bracket
The bracket acts as the main current-carrying base inside signal and power relays. A silver-contact rivet is riveted onto the prepared flat, and the bracket carries load current through each make-and-break cycle.
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Miniature circuit breaker (MCB) busbar connection
In MCBs, the bracket links the terminal and the trip mechanism as a current path. Its section area is sized to the rated current so the breaker stays inside its thermal limits.
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Contactor and low-voltage switch base
Used as the conductive base that carries inrush current in contactors and low-voltage switches, with bent ends keeping terminal positions aligned for screw or crimp connection.
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Energy-storage module and meter busbar link
Serves as a current-diversion carrier between cells, boards and meter terminals. High conductivity of T2 copper keeps link temperature low under sustained load. This page centers on the relay and MCB conductive bracket; separate stamped parts for breaker-only layouts are covered on their own pages.
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Frequently Asked Questions about High Precision Connecting Copper Sheet Metal Stamping
How does bracket cross-section affect temperature rise at rated load current?
Wider or thicker T2 copper section lowers DC resistance and cuts I²R heat. The bracket is sized so steady-state temperature stays inside the insulation-class limit for the relay or MCB. Section area, plating and contact force are set together during design review.
Why control bend radius on a T2 copper bracket?
Tight bends on hard copper can crack the bend zone and raise local resistance. We keep bend radius near or above one sheet thickness and select annealed or half-hard temper, so the bracket bends without fracture and holds shape after springback.
Does plating change the contact resistance of the bracket?
Tin or silver plating lowers surface resistance and slows oxidation at the connection interface, so the design-target contact resistance stays stable over service. Plating thickness is set by current and duty; selective plating limits cost to the contact zone.
What information do you need for a Stamped Copper Sheets quote?
Send the 2D or 3D drawing, copper grade, temper, thickness, plating, target batch size and the rated current with operating temperature. These inputs fix the cross-section, bend and tolerance, so the first sample fits your relay or MCB assembly.
contact us
Send your relay or MCB bracket drawing together with the rated current, and we will quote your Copper Part Stamping order with tooling and lead time included.
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