ABB TK851V010 – Industrial Motor Protection Relay for Reliable Overload & Phase Failure Detection

If you’re managing motor control systems in demanding environments—like pumping stations or conveyor lines—you’ve probably run into nuisance trips or undetected phase imbalances. The ABB TK851V010 is one of those compact yet robust electromechanical relays that tends to fly under the radar, but from my experience, it’s become a go-to solution in many industrial panels where simplicity and reliability matter more than flashy digital interfaces.

Key Features

• Three-phase motor protection: Monitors overload, phase loss, and phase imbalance—common failure points in motors driving compressors or mixers.
• Adjustable trip class (Class 10/20): You might notice that this flexibility helps match startup loads without compromising safety—especially useful with older motors that draw higher inrush current.
• Manual or automatic reset option: Typically set to manual in safety-critical applications, though auto-reset can be enabled if remote restarts are acceptable.
• Compact DIN rail design: Fits neatly into standard control cabinets alongside contactors like ABB’s TA series, saving space without requiring additional mounting hardware.
• Visual status indication: One thing I appreciate is the clear mechanical flag indicator—it makes troubleshooting fast during plant walkdowns.

Technical Specifications

Application Fields

This relay works well in water treatment plants, HVAC systems, and light manufacturing setups—anywhere three-phase motors need basic but dependable protection without investing in full programmable logic controllers. In many cases, it’s paired with ABB’s DOL starters for pump control panels. It seems particularly suited for retrofit projects where upgrading to digital monitoring isn’t cost-effective.

Advantages & Value

While not as feature-rich as electronic motor management systems, the TK851V010 offers long-term value through durability and ease of integration. Procurement teams often favor it due to its consistent performance across batches and low failure rate in field use. Compatibility with standard DIN components means fewer spare part variants to stock. And since it doesn’t require external power, wiring complexity drops significantly—reducing both installation time and potential fault points.

Installation & Maintenance

Install in a clean, dry enclosure meeting IP54 or higher standards. Ensure adequate ventilation around the unit—especially when mounted near heat-generating devices like contactors. Wiring should follow local electrical codes; torque terminal screws to 0.7 Nm. From my experience, most issues arise from incorrect current range settings or reversed phase connections during commissioning. Routine checks every six months—including cleaning dust buildup and verifying trip function—help maintain reliability. No firmware updates, of course, but periodic functional testing using a test button is recommended.

Quality & Certifications

Certified to CE, UL, and RoHS standards—making it suitable for deployment in North America, Europe, and many Asian markets. Built under ISO 9001-controlled processes at ABB facilities, ensuring batch consistency. Comes with a 365-day warranty against manufacturing defects.

Order Placement & Guarantees

• Delivery time: 1 week for in-stock units; no more than one month at the latest for backorders.
• Payment method: 50% advance payment, balance before shipment.
• Express delivery: Shipped via FedEx, UPS, or DHL depending on destination and urgency.
• Warranty: Full 365-day coverage from date of dispatch.