S-MUL250 vs S-MUL350 Mini PCB Unloader: Magazine-Free Sizing Guide

At the end of most SMT or FPC lines, someone still has to lift every board off the track by hand. Southern Machinery's S-MUL series takes over that job without adding a magazine.

What the S-MUL series does

Designed for SMT and FPC lines, the Mini PCB Unloader provides semi-automatic unloading in a compact footprint that saves floor space. Its belt carries PCBs upward, and the machine automatically corrects tilted boards.

Because there is no magazine, an operator removes the boards from the track — and that is precisely what keeps the unit small and light.

Verified specifications

| Parameter | S-MUL250 | S-MUL350 |

| --- | --- | --- |

| Dimensions (L×W×H) | 600×475×1400 mm | 700×650×1400 mm |

| PCB size | 50×50–330×250 mm | 50×50–445×350 mm |

| Weight | ~100 kg | ~110 kg |

| Max PCB capacity | 50 pcs (cyclic) | 50 pcs (cyclic) |

Shared by both models: left-to-right or right-to-left transport (specify when ordering); 900 mm ±20 mm transport height; 6-second conveyor cycle; 110/220 VAC, 50 Hz, single phase, 100 VA max; ESD flat belt; PCB weight up to 2 kg.

S-MUL250 or S-MUL350?

• Choose the S-MUL350 for boards up to 445×350 mm — the 350 mm width class.
• Choose the S-MUL250 for boards up to 330×250 mm and the tightest floor plan.
• Both share the 900 mm transport height and the 2 kg board limit.

Features and line integration

Small footprint, key-based control interface, enclosed chassis structure, lead-screw width adjustment, and a double circulation tank chain.

1. Takes boards off after reflow, wave soldering, AOI or test.
2. The 900 mm ±20 mm height matches standard SMT conveyors.
3. A SMEMA handshake and ESD belt protect the hand-off.
4. Tilt correction aligns boards before take-off.

When a magazine unloader is the better choice

For high-volume, zero-touch lines, move up to a magazine unloader (SUL/SULD) or an NG/OK unloader. The S-MUL series wins when space, budget and changeover flexibility matter more.

ROI perspective

Eliminating manual lifting at the end of the line improves operator safety and lets one person cover more of the line. Payback is modelled case by case.

About Southern Machinery

Founded in 2011 in Shenzhen, Southern Machinery supplies SMT/THT automation to more than 237 customers worldwide — insertion, wave soldering, board handling and inspection — backed by global support.

FAQ

Q: What board sizes does the S-MUL350 handle? A: 50×50 to 445×350 mm, up to 2 kg.

Q: Does it need a magazine? A: No — an operator removes the boards from the track.

Q: Which line height does it match? A: 900 mm ±20 mm, the standard SMT conveyor height.

Q: Can it run right-to-left? A: Yes — specify R-to-L when ordering.

Next steps

Send us your board size, weight and line height, and we will confirm the right model in a single reply.

Email: jasonwu@smthelp.com | WhatsApp: +86 13602562576

Catalog: https://file.autoinsertion.com | Images: https://ph.smthelp.com

Line-end unloading demo: https://www.youtube.com/watch?v=nRbTU7N-GR0

Published by Southern Machinery — SMT/THT PCB Assembly Automation Lines, Shenzhen. Serving 237+ global EMS, ODM, automotive and medical customers.