Description
ABB DKTFM418B (3BHB015651P0001) – High-Performance Frequency Monitoring Relay for Industrial Power Systems
If you’re working on turbine control panels or motor protection setups in power generation or heavy industry, the ABB DKTFM418B isn’t just another relay—it’s a solid piece of monitoring logic that tends to stay out of trouble once it’s set up right. This module, model 3BHB015651P0001, is built to detect frequency deviations in three-phase systems and trigger protective actions before equipment damage occurs. From my experience, it shows up most often in retrofit projects where legacy ABB Symphony systems are still running critical processes.
Key Features
- Frequency monitoring with adjustable thresholds: You can set both high and low-frequency trip points, which is useful when dealing with unstable grids or generator synchronization issues.
- Three-phase voltage input support: It connects directly to VT outputs and tracks phase balance—helpful in catching upstream transformer or grid faults early.
- Relay-based output contacts: Two changeover relays typically handle alarm and trip signals, compatible with older PLCs or annunciator panels without needing interface modules.
- Front-panel LED indicators: One thing I appreciate is the clear visual status—frequency normal, alarm, and trip conditions are easy to spot during walkdowns.
- Modular rail mounting: Fits standard 35mm DIN rails and integrates neatly into ABB-compatible cabinets alongside other Symphony components.
Technical Specifications
| Parameter | Value |
|---|---|
| Brand / Model | ABB / DKTFM418B (3BHB015651P0001) |
| HS Code | 85371090 – Parts of programmable controllers and industrial automation systems |
| Power Supply | 24–60 VDC, typically powered from station battery supply |
| Signal Inputs | Three-phase AC voltage (typically 100–115V line-to-line) |
| Output Type | 2 x relay changeover contacts (dry contact), rated 5A at 250VAC |
| Operating Temperature | 0°C to +55°C — performance may drift slightly near upper limit if ventilation is poor |
| Installation Method | Top-hat DIN rail (35mm), vertical or horizontal orientation |
| Dimensions (H×W×D) | Approx. 120 × 60 × 115 mm — fits tightly in dense relay racks |
| Weight | About 0.4 kg |
Application Fields
This unit pops up a lot in environments where frequency stability matters—like combined cycle plants, hydroelectric stations, or industrial co-generation units. It’s commonly used to monitor bus frequency before closing breakers or to protect motors fed by variable frequency drives when utility swings happen. Some clients also use it as a backup verifier in black-start sequences, where getting the frequency window correct is non-negotiable.
Advantages & Value
While newer digital relays offer communication ports and data logging, the DKTFM418B has its place—especially if you’re maintaining an existing system and want plug-and-play reliability. There’s no firmware to update, no IP address to assign. In many cases, replacing one of these goes faster than commissioning a multifunction device. Procurement teams tend to like it because it’s less expensive than full microprocessor-based protection relays, and spare units last years on the shelf without degrading.
Installation & Maintenance
Mount it on a clean DIN rail inside an enclosure rated at least IP54. Avoid locations near high-heat sources like power supplies or resistors—thermal stress seems to be the main cause of long-term component drift. Wiring should use 1.5 mm² stranded copper with ferrules, especially for the VT inputs to reduce noise coupling. One small tip: label both the input and output terminals clearly, since the silkscreen can fade over time.
Routine checks every 18–24 months usually suffice—verify relay operation with a secondary injection test, clean dust buildup with dry air, and confirm power supply stability. No scheduled calibration is specified by ABB, but field feedback suggests checking pickup/dropout voltages if nuisance tripping starts occurring.
Quality & Certifications
It carries CE marking and complies with applicable EU directives including RoHS. While UL listing isn’t always shown in documentation, it’s typically accepted under panel-level certification when installed per local codes. The original manufacturer warranty runs 365 days—standard for ABB industrial electronics—and covers defects in materials and workmanship under normal operating conditions.
Our Order Placement Process and Guarantees
Delivery time: 1 week for in-stock units; no more than one month if shipped from regional warehouse.
Payment method: 50% advance payment required, full payment before delivery.
Express delivery: Shipped via FedEx, UPS, or DHL depending on destination and urgency.
Warranty: 365-day coverage included—covers repair or replacement for manufacturing defects.
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