Product Core Brief
- Model: (Variant: )
- Brand: ABB
- Series: REM620 / REX620 motor protection platform
- Core Function: Protects low- and medium-voltage motors against overload, short circuit, ground fault, and thermal stress, with measurement and communication capability
- Product Type: Motor protection relay
- Key Specs: VERIFY (rated current / CT input) | VERIFY (supply voltage) | VERIFY (communication protocol from suffix)
- Condition: New Original / New Surplus
Key Technical Specifications
| Category | Parameter | Value |
|---|---|---|
| Identification | Model | |
| Identification | Variant Code | |
| Identification | Brand / Platform | ABB / REM620 (REX620 family) |
| Function | Protection | Overload, short circuit, ground fault, thermal model |
| Inputs | Current Channels | VERIFY (typ. 3-phase + neutral/ground) |
| Inputs | Voltage / Auxiliary | VERIFY |
| Outputs | Trip / Signal Relays | VERIFY |
| Communication | Protocol | VERIFY — decode from suffix (Modbus / PROFIBUS / none) |
| Enclosure | Mounting | VERIFY (flush / panel / DIN) |
| Environmental | Operating Temperature | VERIFY |
| Compatibility | Interchangeable Variants | VERIFY — suffix defines options, not interchangeable |
| Supply | Availability Status | Legacy / discontinued stock |
Product Introduction (No Fluff)
REM620E-F is a motor protection relay from ABB, deployed on MCC and motor feeder panels to replace legacy thermal overloads and electromechanical protection. It measures, protects, and reports — which means the motor’s health is visible before it trips.
The variant suffix is the part that trips people up. Two relays with the same REM620E-F nameplate can differ in communication option or factory configuration, and the panel will reject the wrong one. Bottom line: match the entire code, not the model prefix.
QA & Testing SOP
How a protection relay gets validated before it leaves our shelf.
- Anti-counterfeit intake. Nameplate photographed under raking light. Full variant string must be legible and laser-etched — counterfeits fail on the trailing characters.
- Terminal and housing inspection. CT input terminals checked for oxidation and heat discoloration; display and keypad verified for physical damage.
- Auxiliary power-up. Rated auxiliary voltage applied through a current-limited supply. Display startup, self-test result, and LED behavior logged against the manual.
- Injection test. Primary current injected via a test set (e.g., Omicron or a bench current source) through the CT inputs. Pickup values and trip curves verified at 105% and 120% of setting — not just “does it trip.”
- Communication check. If the variant includes a comms option, protocol address polled and a register read confirmed before packing.
- ESD-safe packing. Anti-static bag, foam cradle, sealed and photographed.
Installation Pitfalls & Guide
❗ CT ratio and polarity. The relay’s protection function is only as good as its CT input. Confirm the CT ratio matches the configured value, and observe polarity — reversed CTs produce phantom differential or ground-fault trips.
❗ Configuration file, not hardware, is the usual failure. A replacement relay boots fine but holds default settings. Load the engineered parameter set before energizing, and verify the trip curve class matches the motor’s thermal capability.
❗ Trip output wiring. REM620 variants differ in relay output count and form. Confirm the trip and alarm terminals against the panel drawing — do not assume the same pin layout as the removed unit.
❗ Grounding and CT secondary safety. Never open a live CT secondary. Short the secondary before disconnecting the relay, and keep the relay’s ground reference single-point.
Replacement sequence:
- Pre-install — photograph terminal wiring and the display’s parameter list; export or hand-record all settings.
- Removal — de-energize the feeder; short CT secondaries before disconnecting.
- Install — mount, torque terminals to spec, restore CT connections and grounding.
- Power-on test — cold boot, load configuration, verify measured current against a clamp reference, then perform a secondary injection trip test before returning the motor to service.
Technical FAQ
Is pricing negotiable on volume? On discontinued stock, price follows availability rather than quantity. If we hold three units and you need five, the second batch may cost more — or may not exist. Tell us your real requirement up front.
What warranty applies? Twelve months on New Original. Six months on New Surplus, because the unit was manufactured for a project that never deployed it. We state that difference rather than bury it.
Will any REM620E-F swap into my panel? Not necessarily. The variant suffix defines communication options and factory configuration. Match the complete code, including .
Why not upgrade to a current ABB relay instead? Because a newer platform means re-terminating CT circuits, rewriting the configuration, and re-validating the protection coordination study. That’s an engineering project with a schedule, not a purchase order. If you want that path, we’ll scope it honestly.
Is this part obsolete? Treat it as legacy. Order spares against your maintenance horizon, not against today’s trip.
Want me to add FAQPage + Product Schema markup, or a nameplate-verification checklist your QA team can sign off against? A nameplate photo would let me replace every VERIFY field with confirmed data.
