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- ABB
- TK856
- RCU Control Link Cable
- Sweden
- 160 × 130 × 90 mm
- 0.85kg
- 3BSE057021R1
- Xiamen, China
- New & In Stock
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Product Profile – ABB TK856 (3BSE057021R1)
1. Product Introduction
The TK856 (3BSE057021R1) is a multifunctional protection relay designed for industrial electrical systems. It provides precise monitoring, fault detection, and automatic isolation in case of abnormal conditions. Engineered for medium- to low-voltage systems, TK856 ensures system safety, reduces downtime, and enhances operational reliability.
With its modular design, TK856 allows for flexible integration into existing electrical networks. The relay supports multiple output configurations and offers user-friendly programming for various protection scenarios. Its robust construction ensures long-term reliability even in harsh industrial environments.
2. Brand and Series Information
Brand: ABB Professional Electrical Instruments
Series: TK Series – Advanced Protection Relays
The TK Series focuses on protective relays for motors, generators, transformers, and distribution networks. The series emphasizes precision, adaptability, and extended service life, making it suitable for both utility and industrial applications.
3. Product Parameters – TK856
| Parameter | Specification |
|---|---|
| Model | TK856 (3BSE057021R1) |
| Function | Multifunction Protection Relay |
| Rated Control Voltage | 24–250 V AC/DC |
| Frequency Range | 50 / 60 Hz |
| Relay Outputs | 8 programmable outputs |
| Communication | Modbus RTU / Profibus |
| Display | Backlit LCD with LED indicators |
| Mounting | DIN Rail / Panel Mount |
| Dimensions | 160 × 130 × 90 mm |
| Weight (kg) | 0.85 kg |
| Operating Temperature | ‑20°C to +60°C |
| Protection Level | IP20 |
| Standards Compliance | IEC 60255 |
| Trip Accuracy | ±1% of setting |
| Configurable Curves | Yes, multiple |
| Event Recording | 2048 events |
| Power Consumption | ≤ 10 W |
4. Product Applications
The TK856 is suitable for a wide range of industrial and utility applications:
• Protection of motors and generators
• Medium- and low-voltage distribution boards
• Critical infrastructure like power plants and substations
• Renewable energy integration points
• Industrial automation systems requiring high reliability
• Protection against overcurrent, earth faults, phase imbalance, and short circuits
Its flexibility allows it to serve both new installations and retrofitted systems, providing rapid fault detection and precise isolation.
5. Product Advantages
The TK856 offers multiple advantages:
• Accurate and configurable protection settings for different network conditions.
• Rugged design suitable for industrial environments.
• Multiple communication protocols for integration with PLCs and SCADA.
• Event recording with timestamps for troubleshooting and historical analysis.
• Fast response to faults, minimizing equipment damage and downtime.
• Compact design and lightweight, ideal for panel mounting.
• Supports multiple programmable outputs for flexible control.
6. Related Models in the Same Series
| Model | Rated Voltage | Outputs | Communication | Size (mm) | Weight (kg) |
|---|---|---|---|---|---|
| TK855 (3BSC950356R1) | 24–250 V AC/DC | 6 | Modbus RTU | 150 × 120 × 85 | 0.75 |
| 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 |
| TK870 (3BSC950450R1) | 24–250 V AC/DC | 10 | Modbus / TCP | 180 × 140 × 100 | 1.0 |
7. Other Popular Models From the Same Brand
| 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 – TK856
Q1: What is the main function of TK856?
A1: The TK856 is a multifunctional relay that protects electrical systems by monitoring parameters and isolating faults automatically.
Q2: What voltage range does it support?
A2: The device supports 24–250 V AC/DC control voltage for versatile applications.
Q3: Which communication protocols are supported?
A3: It supports Modbus RTU and Profibus for integration with control systems.
Q4: Can it log events?
A4: Yes, it records up to 2048 events for troubleshooting and analysis.
Q5: What is the mounting type for TK856?
A5: It can be mounted on DIN rails or panels.
Q6: What is the operating temperature range?
A6: It operates reliably between ‑20°C and +60°C.
Q7: How many programmable outputs are available?
A7: TK856 provides 8 programmable relay outputs.
Q8: Is the display backlit?
A8: Yes, it has a backlit LCD with LED indicators.
Q9: What standards does the TK856 meet?
A9: It complies with IEC 60255 for protective relays.
Q10: Can protection curves be customized?
A10: Yes, multiple protection curves can be configured according to network requirements.