Automated Fuse Holder and Fuse Socket Insertion for THT PCB Assembly

Fuse holders and fuse sockets are among the last components most factories still place by hand. They are bulky, they sit off-grid, and they have to survive a mechanical push-and-turn cycle once a fuse is fitted. Southern Machinery builds dedicated THT insertion equipment for exactly this component class: the S-7000I fuse holder insertion machine (bulk-fed, vision-programmed) and the SFT830 full-automatic fuse socket assembly machine (dual-head, dual-bowl, about 2,000 finished assemblies per hour).

What is this machine used for?

A fuse holder insertion machine places through-hole fuse holders into a printed circuit board automatically, then clinches the leads so the part stays seated before wave or selective soldering. The operator loads a bare or SMT-populated PCB, the machine picks fuse holders from a bulk feeder, corrects the position visually and inserts them to a programmed pattern. Southern Machinery's S-7000I does this on a vibration-plate feeder with online visual programming, so no custom tray or tape packaging is required — the components arrive in bulk.

The SFT830 goes one step further upstream. It assembles the fuse socket itself: brass terminal clips and plastic fuse socket bodies are fed through dual vibratory bowls, a CCD optical vision system verifies 100 % directional consistency, and force-controlled dual heads synchronously insert two terminals into each socket body.

Why fuse holders and fuse sockets resist manual assembly

Odd-form geometry. Fuse holders are tall, asymmetric, and often have two different lead pitches — they cannot be placed by a standard radial or axial inserter.
Lead force. Seating a terminal clip needs controlled insertion force; hand insertion produces bent clips, loose sockets and intermittent contact after soldering.
Labor cost and turnover. Manual insertion is repetitive and hard to staff consistently, and quality drifts with shift and operator.
Post-solder rework. A mis-inserted clip is usually found after wave soldering, when rework costs several minutes per board.

Typical application scenarios

Southern Machinery's own application note for the S-7000I fuse holder class lists home appliance manufacture, elevator manufacture, power equipment and other industries, plus SMT back-end odd-form component automation. In practice the equipment is used for:

Home appliances — air conditioners, washing machines, TVs, microwave ovens, induction cookers, electric kettles.
Power supply and power boards — vehicle power supplies, energy-saving power supplies, ballasts, adapters and chargers.
Elevator and industrial control panels — where fuse holders protect control and motor circuits.
Automotive electronics — cabin, lighting and body-control boards with blade-fuse sockets.
Energy-saving lighting — LED drivers and outdoor/street-lamp power modules.
EMS and ODM factories producing mixed-technology boards in high-mix, low-volume or high-volume modes.

How it integrates into a complete SMT/THT PCB assembly line

Both machines are designed as inline or standalone stations inside an existing Southern Machinery SMT/THT line:

SMT front end — stencil printing (SP-series printers), pick-and-place, reflow oven, SPI/AOI.
THT insertion — radial inserters (S-3000/S-3010 series), axial inserters (S-4000), odd-form and terminal inserters (S-7000/S-7020 series), and the fuse holder/socket machines described here.
Board handling — SMEMA-compatible loaders, buffers, shuttle and turn conveyors keep boards moving between stations; the S-7000 platform carries an SMEMA connector for this purpose.
Soldering — wave soldering (S-WS450 / S-WS350B lead-free dual wave) or selective soldering for boards with solder-sensitive SMT parts.
Cleaning, inspection and depaneling — PCBA cleaning (SME6200 / SQC250A), AOI/SPI/X-ray counting, and PCB separators.
After-sales — spare parts, retrofit kits, operator training and overhaul from Southern Machinery's service team.

Key selection parameters to confirm before you order

These are the parameters Southern Machinery confirms with every customer. The verified S-7000I figures are shown as a reference point:

Component family and packaging — fuse holder or fuse socket; bulk, tube, tape or tray. S-7000I: bulk fuse holders, vibration-plate feeding.
Board envelope — panel and PCB size range. S-7000I: PCB 50 × 50 mm to 480 × 390 mm; insertion range up to 480 × 340 mm.
Insertion point density and cycle time — insertion points per board. S-7000I: 0.6–0.8 s per insertion point, repetitive positioning accuracy 0.02 mm.
Load/unload and automation level — manual load vs. inline conveyor. S-7000I: 3 s load/unload, automatic PCB load/unload available.
Programming and data management — visual/teach programming, Excel batch import, hole naming. S-7000I: online visual programming, visual correction and Excel programming.
Changeover strategy — how often the line switches product and whether quick-change modules are needed.
Facilities — power and air. S-7000I: single-phase 220 V AC 50/60 Hz, 2 kVA; 5–6 kg/cm² air at 0.6 m³/min; 2160 × 1450 × 1600 mm, 1200 kg.
Quality target — outgoing board quality level and traceability requirements. The S-7000 odd-form platform is specified at 500 ppm outgoing quality or better.

ROI, quality and throughput perspective

The business case rests on three things:

Labor replacement. Southern Machinery's SFT830 demonstration states the machine takes the place of several manual assembly stations while producing about 2,000 finished fuse socket assemblies per hour. On a single-shift line that is capacity no hand-assembly cell can match without adding headcount.
First-pass yield. CCD directional verification before insertion, force-controlled heads and 0.02 mm positional repeatability remove the bent-clip and mis-oriented-terminal defects that appear only after soldering — the most expensive place to find them.
Asset reuse. The S-7000I is built on a modular insertion platform with customized insertion-line modules, so a product change can be covered by changing modules and the insertion trajectory instead of buying a new machine.

FAQ

What is a fuse holder insertion machine used for?

It automatically places through-hole fuse holders (and, on the SFT830, assembles fuse sockets from terminal clips and plastic bodies) onto a PCB, replacing repetitive manual insertion before wave or selective soldering.

Can the S-7000I handle fuse holders supplied in bulk?

Yes. The S-7000I is fed by a vibration plate and specified for bulk-packed fuse holders, so no custom tray or tape packaging is required.

How fast is fuse holder insertion?

The S-7000I is specified at 0.6–0.8 seconds per insertion point with 0.02 mm repetitive positioning accuracy. The SFT830 fuse socket assembly machine is demonstrated at about 2,000 finished assemblies per hour.

Does this equipment fit an existing SMT/THT line?

Yes. It is designed for inline integration with SMEMA-compatible board handling, or can run standalone for high-mix production.

Which industries use fuse holder and fuse socket insertion machines?

Home appliance, elevator, power supply, energy-saving lighting, automotive electronics, industrial control and EMS/ODM manufacturing — wherever board-level fuse protection is assembled in volume.

What support does Southern Machinery provide?

Installation, operator training, spare parts, retrofit and upgrade kits, preventive maintenance and overhaul. Southern Machinery (Shenzhen, China, founded 2011) has served 237+ customers worldwide with SMT/THT PCB assembly automation equipment and complete line solutions.

Contact Southern Machinery for configuration advice

Tell us your fuse holder or fuse socket part number, packaging, PCB size and target output — we will recommend the right machine and feeder configuration.

Jason Wu — jasonwu@smthelp.com | +86 13602562576
Machine catalog: file.autoinsertion.com
Machine photos: ph.smthelp.com
Website: www.smthelp.com

Automated Fuse Holder & Fuse Socket Insertion for THT PCB Assembly