GE M2LR-00-01-00

Description

Product Introduction

The motor trips. The operator resets it. It trips again five minutes later. The amp clamp says 80% of full load. The relay says 110%. That’s when you know the thermal model is wrong—or the relay is cooked.

The GE M2LR-00-01-00 is the entry‑level motor protection relay from the Multilin M2 series. It’s the one you pick when you need solid protection—thermal overload, current unbalance, ground fault, stall—without the bells and whistles. No communications. No RTD inputs. No fancy display. Just a basic front panel with LEDs and a few configuration buttons.

I’ve installed these in pump stations, compressor skids, and conveyor systems. The M2 is bulletproof. The failure mode is usually input channel drift—one phase reads 10% high, the relay thinks the motor is overloaded, and it trips. The fix is swapping the relay. The terminals are the same. Five minutes, if the spare is on the shelf.

Key Technical Specifications

Quality Inspection Process (SOP Transparency)

M2 relays are simple. That means failures are subtle.

1. Incoming Verification
   This batch came from a GE authorized distributor’s final M2 stock. Sealed boxes. Serial numbers traceable to 2015–2017 production.
2. Visual Inspection
   First: the terminal block. No bent pins, no corrosion. Next: the display glass—no scratches. Also check the case for heat discoloration. If it’s been used before, the case will show it.
3. Live Functional Test
   We test the M2LR-00-01-00 with a current injection test set. Procedure:
   • Power‑up at 120 VAC: verify display lights, LEDs cycle
   • Inject 5 A on phase A, verify displayed current (should be 5.0 ±0.15 A)
   • Inject 6 A (120% of CT), verify thermal capacity rises
   • Overload test: inject 6 A, verify relay trips within the set curve time
   • Ground fault: inject 0.5 A on residual input, verify trip
   • Phase rotation test: reverse B and C, verify relay flags rotation error
   • Soak test: run at 5 A for 30 minutes, monitor for drift
4. Output Relay Test
   Cycle each of the four relays under load (24 VDC, 0.5 A) 10 times. Any sticking or failure to pick up rejects the unit.
5. Final QC & Packaging
   Passed units go back in anti‑static bags, then bubble wrap, then a carton with QC sticker showing test date, trip time verification, and CT accuracy.

Field Replacement Pitfalls

The M2 is simple. That’s why people make the same mistakes.

1. CT wiring.
   The relay expects CTs on A, B, C in that order. I’ve walked into a panel where the electrician landed B on A, C on B, A on C. The relay displayed 200 A on phase A when it was actually 0. Mark your wires before you pull the old relay.
2. ❌ Control power mismatch.
   The M2 runs on 90–300 VDC or 70–265 VAC. I’ve seen someone wire 24 VDC to it because “it’s a relay, it must run on 24 V.” The unit won’t power up. It won’t smoke. It just sits there dead. Check the label before you land anything.
3. Ground fault sensitivity.
   The M2LR uses residual current calculation from the three phase CTs. That works down to about 10% of CT rating. If you need sensitive ground fault below that, you need a separate zero‑sequence CT. One water plant tried to trip on 1 A ground faults using the residual method. They got nuisance trips every time a pump started.
4. Display backlight.
   The backlight is CCFL. It fades with age. If you’re installing a new‑old‑stock unit that’s been sitting for years, the backlight may be dim. It still works. Just harder to read in bright light. The later M2 models used LED backlights, but the M2LR-00-01-00 is from the CCFL era.
5. Parameter backup.
   The M2 has no communication. No way to back up settings except writing them down. I’ve seen a crew swap a relay and spend an hour re‑entering trip settings from a faded tag inside the cabinet door. Write the settings down before you pull the old relay.

Get these five right and you’ll cut rework time by 90%.

New Original vs. Refurbished: Why It Matters

“New Original (New Surplus)” means this GE M2LR-00-01-00 was built by GE, never installed, and never repaired. The CT inputs haven’t been stressed. The internal clock battery hasn’t been drained. The display backlight has full life.

Refurbished M2 relays are risky for two reasons. First, the CT inputs have surge suppressors that degrade with age. A refurb unit might pass a low‑current test but fail a high‑current inrush test. Second, the internal battery that backs up the event log is often near end‑of‑life. A refurb unit might hold settings for a year, then lose them on a power cycle.

What we provide:

• Traceable serial number (matches GE production records)
• Full current injection test (0–6 A sweep, all phases)
• Trip time verification against set curve
• Ground fault test
• Output relay cycle test
• Original anti‑static bag (if available) or fresh bag with QC seal
• 12‑month warranty

Pricing context:
Our price sits above the cheapest used listings. It’s also below what a new relay would cost if GE still made them. You’re paying for the test, the warranty, and the certainty that the CT inputs aren’t marginal.

Performance Benchmarks & Test Results

All tests performed at 25 °C ambient, 120 VAC control power, 5 A CT inputs.

Thermal performance note:
At 55 °C ambient, the current reading drifts about 1.5%. Still within spec. The display contrast shifts at high temp—a quick press of the contrast button fixes it. The biggest issue at high temp is the output relays. They’re rated for 60 °C ambient. Above that, they derate. If your cabinet runs hot, use external relays to switch the motor contactor.

One more thing from the field:
The M2LR-00-01-00 has a small reset button on the front panel. I’ve seen operators press it when the relay trips. It clears the fault. That’s fine. But if the motor trips again immediately, something else is wrong. I’ve seen a plant reset the relay 20 times in a shift before someone checked the motor. The motor was seized. The relay was fine. The operator was bypassing it. Don’t do that. The relay is telling you something. Listen.