Tel: 
Email: 
WhatsApp: Description
Key Technical Specifications
- CT Input Rating: 1A (Secondary current rating, crucial for matching your current transformers)
- Auxiliary Power Supply: 125-250V DC (Standard substation control voltage)
- Communication Ports: Front Ethernet (10/100Base-TX), Rear RS485 (Modbus/DNP3)
- Digital Inputs (DI): 8 Optically Isolated Inputs (Typically 48-125V DC)
- Digital Outputs (DO): 5 Form-A (SPST) Output Relays
- Analog Outputs: 2 Isolated 4-20mA Outputs (For connecting to legacy SCADA or meters)
- IRIG-B Time Sync: Supported (For precise event recording and fault analysis)
- Mounting Style: Flush Mount (Panel mount with rear case)
- Display: Large backlit LCD with navigation keys
- Protection Standards: Complies with IEEE C37.90 and IEC 60255 series
Product Introduction
If you have ever had a critical pump or fan trip at 3 AM and had no idea why, you know exactly why the GE C60 exists. The C6M-9UH-00K is a workhorse motor management relay from the Multilin UR family, designed specifically to keep medium-voltage motors from burning out due to overloads, jams, or ground faults. It sits right on your substation panel, watching every amp and volt so your operators don’t have to guess what is happening inside the switchgear.What makes this specific unit valuable in the field is its robust DC power supply (125-250V DC) and the 1A CT input rating, which is standard for many older and industrial power systems. It logs everything—thermal capacity used, exact trip times, and waveform captures—so when something goes wrong, you have actual data instead of hunches. The front Ethernet port is a lifesaver for quick laptop connections during commissioning, saving you from crawling behind the panel to find the rear comms port.
Quality SOP & Tech Pitfalls (The Reality Check)
The Lab Report (SOP)
Every GE UR relay we ship goes through a strict checkout. We start with a physical inspection of the rear terminal connectors and the front LCD for any cracks. We then apply a regulated 125V DC to the auxiliary terminals and verify the unit boots up without any “Self-Test” or “Hardware Fail” alarms. Using a secondary injection test set, we simulate a basic overcurrent fault to ensure the output relays actually pick up and drop out cleanly. Finally, we wipe the event log, seal it in anti-static packaging, and box it up.The Engineer’s Warning (Pitfalls)
Here is the number one mistake I see with the C60: the CT secondary rating. This model (C6M-9UH-00K) is built for 1A CTs. If your switchgear has 5A CTs and you wire this relay in, your metering will be wildly inaccurate, and your protection curves will be completely off, likely causing a nuisance trip or a failure to trip. Always check the rating plate on your main current transformers before installing this relay. Also, don’t forget to set the IRIG-B time sync; troubleshooting a fault log with the wrong timestamp is an absolute nightmare.
Installation & Configuration Guide
- Pre-Installation: Isolate the control power (125-250V DC) and ensure all CT secondary circuits are safely shorted before disconnecting anything. Warning: Never open-circuit a live CT secondary; it can generate lethal voltages.
- Removal: Unscrew the rear terminal screws and carefully pull the old relay out of the panel cutout. Take a photo of the rear wiring and the front configuration menu if the old unit is still powered.
- Installation: Slide the C6M-9UH-00K into the panel cutout and secure the mounting brackets. Double-check that your CT wiring matches the 1A input requirement. Reconnect the DC control power and verify polarity.
- Power-On & Testing: Apply the DC auxiliary power. The LCD should light up and display the GE Multilin logo. Check the “Status” menu to ensure there are no active alarms. Connect your laptop via the front Ethernet port using EnerVista software to verify the firmware version and download your protection settings.
Compatible Replacement Models
- ✅ Drop-in Replacement: GE C6M-9UH-00K (Same Firmware Revision) – An identical unit is always the safest swap. Just download the settings, and you are back online.
- ⚠️ Software Compatible: GE C6M-9UH-00H / C6M-9UH-00L – Other C60 motor relays with different communication or I/O options. The physical cutout and wiring are usually the same, but you must verify the CT rating (1A vs 5A) and auxiliary voltage (DC vs AC) match your system.
- ❌ Hardware Mod Required: GE Multilin 469 or 369 – These are older or different form-factor relays. Swapping to these would require cutting a new panel hole and completely rewiring the back terminals.
Frequently Asked Questions (FAQ)
Does this relay work with 5A current transformers?
No. The “9U” in the C6M-9UH-00K part number indicates it is configured for 1A CT secondaries. If you connect it to a 5A CT system, the relay will see 5 times the actual current and trip immediately under normal load. You would need a different model or external CT adapter ratios (which is not recommended for precision protection).Can I use this to protect a generator or just a motor?
This is specifically a Motor Management Relay (C60). While it has some overlapping features, it lacks specific generator protection elements (like reverse power or loss of excitation). For a generator, you should look at the GE G60 relay.What software do I need to program this?
You will need GE’s EnerVista UR Setup software. It allows you to configure the protection curves, view oscillography records, and monitor real-time metering data through the Ethernet or RS485 port.Is the front Ethernet port secure?
The front port is primarily for local commissioning. In a production environment, it is best practice to disable the front port or secure it with a password via the relay settings to prevent unauthorized access to your protection scheme.What is the auxiliary power requirement?
This unit runs on a wide-range DC supply, specifically 125 to 250V DC. Do not connect it to 48V DC or 120V AC, as it will not power up and could damage the internal power supply module.
