Steinert Magnetic Separators: A Cost Controller’s Guide to Choosing Between Eddy Current and Overbelt Magnets

Is there a one-size-fits-all solution for non-ferrous recovery?

If you've ever scrolled through Steinert's product line, you know the feeling. You see the ECS (Eddy Current Separator) on one side and the OH (Overbelt Magnet) on the other. Both promise to pull metal from a waste stream. Both have a price tag that makes your CFO wince. The obvious question is: which one do you need?

Here's the thing. There isn't a universal answer. The 'best' option depends entirely on what you're shredding or sorting. Over my 4 years as a procurement manager, I've audited over $180,000 in cumulative spending on magnetic separation equipment and consumables (like belt scrapers and wear liners). I've negotiated with 10+ vendors and made the wrong call once—that mistake cost me a $1,200 redo in configuration changes.

Take it from someone who has tracked every invoice since 2021: the choice comes down to your material stream. Let me walk you through three typical scenarios so you can figure out which bucket you fall into.

Scenario A: You're Processing Shredded E-Waste or ASR (Auto Shredder Residue)

Your likely answer: Steinert Eddy Current Separator (ECS)

In my first year, I made the classic specification error. I assumed 'separation' meant the same thing for everyone. I nearly bought an overbelt magnet for an e-waste line because it was cheaper. Turns out, I was wrong.

If your feed is mostly non-ferrous metals (aluminum, copper, brass) mixed with plastics, glass, and insulation, an overbelt magnet won't help. It's a magnet. It pulls ferrous (iron/steel). You need something that repels non-ferrous metals—which is exactly what an eddy current separator does.

When I compared costs across 4 vendors in Q2 2023 for an e-waste line, Vendor A quoted a Steinert ECS for $68,000. Vendor B quoted a generic ECS for $42,000. I almost went with B until I calculated total cost of ownership: generic rotors burn out faster, and replacement parts aren't as readily available. The 'cheap' option would have cost us more in downtime.

The bottom line: If your material is smaller than 300mm and non-ferrous, the ECS is a no-brainer. An overbelt magnet is a deal-breaker here.

Scenario B: You're Processing Construction & Demolition (C&D) Waste or Heavy Scrap

Your likely answer: Steinert Overbelt Magnet (OH Series)

This is the scenario where the overbelt magnet shines. If you're dealing with large, heavy material—concrete rubble with rebar, mixed scrap metal, or shredded car hulks—you need brute force. An eddy current separator can't handle a 50-pound chunk of steel. It will just jam the rotor.

I learned never to assume the 'premium' solution is always better. A vendor tried to upsell me on an ECS for a C&D line. When I asked, 'What about a 2-foot piece of rebar?' they admitted it would damage the unit. We went with a Steinert OH overbelt magnet. It was more 'low-tech,' but it was the right call.

For our quarterly orders, the OH costs about $45,000 installed. But here's the catch: don't forget the belt maintenance. An overbelt magnet means a separate conveyor belt that takes wear and tear. In my total cost spreadsheet, I allocated $4,000 per year for belt replacements.

The bottom line: If your material is large, heavy, or ferrous-dominant, an overbelt magnet is your workhorse. Don't let the 'shiny new tech' of an ECS sway you.

Scenario C: You're in a Mixed-Stream Plant (Commingled Recycling)

Your likely answer: A combination (ECS first, then Overbelt)

This was the 'smartest' setup we finally built. I assumed a single machine could do it all. Didn't verify. Turned out, a single machine can't. If you're getting a mix of everything—cans, foil, wire, rebar, wire rope—you need separation by density and type.

Here's the workflow we optimized after 3 iterations:
First: Remove the large ferrous items with an overbelt magnet early in the line (feeder conveyor).
Second: Process the remaining stream with an ECS for non-ferrous recovery.
Third: Use a final overbelt magnet as a 'polisher' to catch any missed ferrous.

And another thing: this setup isn't cheap. Total investment for a 5-ton/hour line with both units was roughly $115,000. But the recovery rate went from 60% to 92%. That extra 32% paid for the equipment in 18 months. In my opinion, if you have the budget and the space, this is the only way to go for commingled material.

The bottom line: Don't buy just one solution for a mixed stream. You'll be running a second pass and eating the cost. The game-changer is using both in sequence.

How to Know Which Scenario You're In

So, bottom line: how do you decide? I built a cost calculator after getting burned on the wrong spec twice. Here's the short version:

1. Test your feed. Take a 50-pound sample. How much is ferrous steel? If it's over 30%, go overbelt. How much is non-ferrous (aluminum, wire)? If it's over 10%, go ECS.
2. Check your particle size. If any single piece is bigger than a basketball, or larger than 300mm, the ECS is probably a risk. Stick with the overbelt.
3. Calculate the payback. The ECS is more expensive ($55k-$80k vs $35k-$50k for an OH). But if you're recovering $20/ton of aluminum at a throughput of 10 tons/hour, the ECS pays for itself in months. The OH is better for volume, not purity.

Personally, I'd rather work with a specialist who knows their limits than a generalist who overpromises. The vendor who said 'That ECS isn't right for your C&D line' earned my trust for everything else.

Prices as of January 2025; verify current rates with Steinert directly. This is the setup that has worked for my budget over the past 6 years, but your mileage will vary. Like most beginners, I thought I could save money by buying cheap first. Pay for the right spec once.