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- TK855
- RCU Data Link Cable
- Sweden
- 150 × 120 × 85 mm
- 0.75kg
- 3BSC950356R1
- Xiamen, China
- New & In Stock
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We have a 10-year logistics and express cooperation agreement, so our products can be shipped to any place in the world.
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Our products are imported in bulk from the place of origin. Because of the cooperative relationship, our products are all original and 100% new.
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We provide 7*24 hours service to our customers. We will be there whenever you need us.
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All our products are priced very favorably because we have our own warehouse and supply.
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Product Profile – ABB TK855 (3BSC950356R1)
1. Product Introduction
The TK855 (3BSC950356R1) is a high‑performance industrial protection relay designed for electrical system monitoring, fault detection and automated shutdown. It is engineered for reliability in demanding industrial environments where system stability, safety, and rapid response are critical.
Its modular hardware design and flexible configuration options allow integration with a wide range of electrical networks and interfacing systems. TK855 is suitable for both new installations and retrofit upgrades, offering precision measurement and robust performance.
2. Brand and Series Information
Brand: ABB Professional Electrical Instruments
Series: TK Series – Protection and Control Relays
The TK Series by ABB focuses on protective relays for motors, generators, transformers and power distribution systems. The series emphasizes accuracy, adaptability and longevity.
3. Product Parameters – TK855
| Parameter | Specification |
|---|---|
| Model | TK855 (3BSC950356R1) |
| Function | Protective Relay for Electrical Systems |
| Rated Control Voltage | 24–250 V AC/DC |
| Frequency Range | 50 / 60 Hz |
| Relay Outputs | 6 programmable outputs |
| Communication | Modbus RTU over RS485 |
| Display | Backlit LCD with status indicators |
| Mounting | DIN Rail / Panel Mount |
| Dimensions | 150 × 120 × 85 mm |
| Weight (kg) | 0.75 kg |
| Operating Temperature | ‑20°C to +60°C |
| Protection Level | IP20 |
| Standards Compliance | IEC 60255 Series |
| Trip Accuracy | ±1% of setting |
| Configurable Curves | Yes |
| Event Recording | 1024 events |
| Power Consumption | ≤ 8 W |
4. Product Applications
The TK855 is ideal for protection and monitoring in:
• Medium and low voltage distribution panels
• Industrial motor starters and drives
• Critical power generation plants
• Renewable energy interfaces
• Building automation safety systems
• Utility substations
Typical applications include overcurrent protection, earth fault detection, phase imbalance monitoring and automated system isolation after fault detection.
5. Product Advantages
The TK855 offers the following advantages:
• High measurement accuracy with programmable protection thresholds.
• Rugged design for harsh industrial environments.
• Multiple communication options for seamless integration.
• Flexible configuration with user‑friendly interface.
• Fast operating speed for fault isolation.
• Supports event logging and historical diagnostics.
• Efficient size and weight suitable for panel mounting.
6. Related Models in the Same Series
The table below lists 5 related TK Series models with key specifications:
| Model | Rated Voltage | Outputs | Communication | Size (mm) | Weight (kg) |
|---|---|---|---|---|---|
| TK851 (3BSC950300R1) | 24–230 V AC/DC | 4 | RS485 | 140 × 110 × 75 | 0.70 |
| TK853 (3BSC950320R1) | 24–230 V AC/DC | 6 | RS485 / Ethernet | 150 × 120 × 85 | 0.78 |
| TK857 (3BSC950380R1) | 48–300 V AC/DC | 8 | RS485 / TCP/IP | 160 × 130 × 90 | 0.85 |
| TK861 (3BSC950400R1) | 24–230 V AC/DC | 6 | PROFIBUS | 150 × 120 × 80 | 0.80 |
| TK865 (3BSC950420R1) | 24–250 V AC/DC | 8 | Modbus / Ethernet | 170 × 135 × 95 | 0.90 |
7. Other Popular Models From the Same Brand
Below are 5 other well‑known protective relay models from ABB’s product family:
| Model | Application | Communication | Size (mm) | Weight (kg) |
|---|---|---|---|---|
| PR630 | Feeder Protection | IEC61850 | 320 × 240 × 160 | 1.8 |
| REX640 | Generator Protection | Dual Ethernet | 300 × 200 × 150 | 1.6 |
| REF542plus | Transformer Protection | Modbus / IEC61850 | 350 × 270 × 180 | 2.0 |
| RET670 | Transmission Protection | IEC61850 / PRP | 360 × 290 × 180 | 2.1 |
| RVC160 | Motor Protection | RS485 | 140 × 100 × 70 | 0.65 |
8. FAQ – TK855
Q1: What is TK855 designed to do?
A1: The TK855 is a protective relay that monitors electrical parameters and trips circuits when pre‑set limits are exceeded.
Q2: What system voltages does it support?
A2: It supports control voltages from 24 V to 250 V AC or DC for flexible installation.
Q3: Can TK855 communicate with a PLC system?
A3: Yes, it supports Modbus RTU over RS485 for communication with PLCs or SCADA.
Q4: What is the operating temperature range?
A4: It operates reliably between ‑20°C and +60°C.
Q5: Does the unit support event logging?
A5: Yes, it logs up to 1024 events with timestamps.
Q6: What kind of mounting does it require?
A6: The relay is designed for DIN rail or panel mount installation.
Q7: Is the display backlit?
A7: Yes, it includes a backlit LCD to display status and measurements.
Q8: What accuracy class does the product use?
A8: It provides ±1% accuracy for measured values within specified settings.
Q9: Does the TK855 support custom protection curves?
A9: Yes, users can configure multiple protection curves.
Q10: What standards does this product comply with?
A10: It meets IEC 60255 standards for protective relays.