Current paths
Terminal, flexible link and contact arm joined into one part, with the joints tested.
For breakers and contactors
Custom assemblies, made to your drawing.
Riveted, welded, brazed and over-moulded assemblies, built from metal and plastic parts and delivered as one part. Manufactured in India, joint tested and inspected against your drawing, and delivered to your Incoterm.
- Metal and plastic in one part
- Joints tested
- Measured records
Breaker current path, 63 ADWG REV. C
- Parts
- Terminal, braid, contact arm
- Joints
- Resistance welded
- Critical dimension
- Contact gap 4.0 ±0.1 mm
- Inspection
- Weld pull and millivolt drop
What we make
Busbar assemblies
Busbars fitted with supports, studs, inserts and flexible links.
For switchgear, busduct and power distribution
Contact and spring assemblies
Contacts, carriers and springs riveted or welded together.
For relays, switches and auxiliary blocks
Over-moulded assemblies
Metal parts moulded into plastic, so they arrive located and insulated.
For terminal blocks, connectors and bobbins
Coil and magnet assemblies
Coils fitted to cores, yokes and terminals, ready to drop in.
For contactors and trip units
Earthing and wired assemblies
Earthing kits, bonding links with lugs, and parts fitted with fasteners to torque.
For panel builders and enclosure makers
Choosing a joint
Every joint is a place for a defect. Choose it for the current, the movement and the volume.
Metal to metal for the current
- Riveted
- No heat and low cost, for contacts, springs and carriers.Watch for: A rivet can loosen under vibration; check the clinch.
- Resistance welded
- Fast, with no filler metal, for copper and steel parts at volume.Watch for: Weld shear or pull is tested every batch.
- Brazed
- A strong, low-resistance joint, also between different metals.Watch for: Flux residue must be cleaned; ask for coverage and shear.
- Ultrasonic welded
- Joins braid, foil and wire to terminals without melting.Watch for: Pull test every batch, to your limit.
Plastic and metal for location and insulation
- Insert and over-moulded
- The metal part is moulded in, located and insulated in one step.Watch for: Contact faces must be free of flash.
- Heat staked and press-fit
- Inserts and pins fitted after moulding.Watch for: Pull-out force is tested to your limit.
- Fastened
- Screws and nuts tightened to the torque on your drawing.Watch for: Torque is set and recorded, not judged by hand.
Specifications
- Types
- Current paths, busbar assemblies, contact and spring assemblies, over-moulded assemblies, coil and magnet assemblies, earthing and wired assemblies
- Joining
- Riveting; resistance, ultrasonic and laser welding; brazing; soldering; insert and over-moulding; heat staking; fastening to torque
- Parts
- Made by us, or supplied by you and fitted by us
- Tests
- Joint pull or shear; millivolt drop; hi-pot; torque; function test on your fixture where specified
- Records
- One inspection record per assembly, covering each part and each joint
- Standards
- Assembly and part drawings; IEC 60947 or IEC 61439 where the assembly applies
- Packing
- Trayed or kitted to suit your line
- Quantities
- Prototype builds to mass production
Parts or one assembly
Buying the assembly moves the joints, and the incoming inspection, off your line.
Six parts, six suppliers
Each part is bought, inspected and stored on its own, and the joints are made on your line.
Choose it for designs still changing, or where you must make the joint yourself.
One assembly
The parts are joined and tested before dispatch, and arrive as one part with one record.
Choose it for stable designs, where every incoming line costs you time.
- Incoming inspection
- Six lines, or one.
- Joints
- Made and tested on your line, or made and tested before they reach it.
- Purchase orders
- One per part, or one for the assembly.
Questions buyers ask
What does it mean that the joints are ours?+
Each joint is made, tested and recorded before the assembly ships. If a joint fails, it is our failure to answer for, not a question between several suppliers.
Can you use parts we supply?+
Yes. We can fit parts you supply alongside parts we make. The inspection record shows which is which.
How are the joints tested?+
To the test on your drawing: pull or shear for welds and rivets, millivolt drop for current-carrying joints, torque for fasteners, and hi-pot where insulation is involved.
Can we start with one part and add the rest later?+
Yes. Many buyers start with one part, then move the next parts and the assembly once the first part is proven.
Can you take a small order?+
Yes. Small, engineering-heavy batches are work we take, from prototype quantities upwards.
Send the drawing
Email us your enquiry at contact@qumek.com. We respond within 12 hrs.
Your enquiries are confidential with us and we proceed with manufacturing only after signing a NDA.
Need a DFM review, a prototype or a test plan before production? See the services.