GE Transformer & Protection Relay FAQ: Answers From an Emergency Specialist

What You'll Find Here

I get questions about GE transformers and protection relays every day. Not the theoretical stuff you find in manuals — real questions from people who need equipment yesterday. Here are the ones I hear most often, answered straight.

Are GE transformers still a reliable choice after the GE Vernova split?

Short answer: yes. The technology didn't change — just the corporate structure. GE Vernova now handles the power generation and electrification side, which includes transformers. In my role coordinating equipment for industrial clients, I've seen the same engineering specs, the same testing protocols, and — honestly — the same lead times.

One thing that did shift: if you're ordering through legacy channels, the paperwork might look different. We had a client in March 2024 who couldn't find their order because it was stuck in an old GE system. It took a few calls to reroute. But the product itself? Same quality.

What's the real difference between the GE Multilin 850 and 845 protection relays?

From the outside, they look similar. Both are feeder protection relays with metering and control. But there's a key difference: the 850 has advanced arc-flash detection built in. The 845 doesn't.

That matters more than you'd think. I worked on an emergency replacement for a chemical plant in Texas back in 2022. They had the 845 units, but the safety audit required arc-flash mitigation. Instead of adding separate sensors, they swapped to the 850. It saved them $11,000 in additional hardware — and weeks of installation time.

If you're in an environment where arc-flash is a known risk (refineries, chemical plants, heavy industrial), the 850 is worth the premium. If you're protecting standard commercial feeders, the 845 does the job.

Is a whole home surge protector worth the investment, or is it overkill?

I used to think they were overkill — until I saw the damage from a single surge. In 2023, a client lost a $4,000 HVAC control board and a network switch because of a lightning-induced surge. The surge didn't even hit their building directly. It traveled through the grid.

A whole home surge protector (installed at the panel) would've caught that. It's a $200–$500 device plus installation. Compare that to replacing electronics after one surge. The math works out fast.

Per the IEEE C62.41 standard, even minor surges from motor starts or grid switching degrade your electronics over time. A whole home protector doesn't just prevent catastrophic failures — it extends the lifespan of everything plugged in. That's the part people don't realize.

When does a generator surge protector make more sense than a whole home unit?

They serve different purposes. A whole home protector handles surges coming from the grid. A generator surge protector handles surges generated by the generator itself.

Generators aren't clean power sources. When they start up or when loads drop abruptly, voltage spikes can happen. If you have sensitive equipment — think medical devices, server rooms, or even modern home theater setups — a generator surge protector isn't optional. It's your second line of defense.

I seen a veterinary clinic lose a $6,000 digital X-ray system because they skipped the surge protector on their backup generator. The generator saved them from the blackout, but the surge from the generator itself destroyed the X-ray. The owner told me, and I quote: 'I didn't even know that was a thing.'

What's the deal with Prolec GE transformers — are they a different product?

Prolec GE is a joint venture between GE and Prolec. They manufacture distribution transformers (the ones you see on poles and in substations). It's not a different product line — it's a separate manufacturing entity using GE's designs and specifications.

If you're ordering a standard distribution transformer, you're likely getting a Prolec GE unit. The quality specs match GE's own. The only catch is warranty and support channels — make sure you know who handles it before you buy. We had a case in early 2024 where a client bought through a third-party distributor and couldn't get warranty support because the paperwork had the wrong entity name. Easy fix, but it delayed them two weeks.

Relay vs. contactor — aren't they basically the same thing?

People ask this all the time. The confusion makes sense because they look similar and both switch circuits. But they're designed for different jobs.

A relay is for low-power switching — typically control circuits, signal switching, or small loads. A contactor is for high-power switching — motors, heaters, large capacitor banks. The key difference is the contactor has arc suppression built in to handle the higher current.

Use a relay where you need a small switch to control a bigger circuit (like a protection relay tripping a breaker). Use a contactor where you're directly controlling a heavy load. Switching them will destroy the relay and, depending on the load, could cause a fire.

I've seen that mistake once. The relay melted. The client was lucky it was in a metal enclosure. That's when I started putting a warning note in every quote for new installations.