Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
1SFA664002R5001 ABB CSU-2LV Current Sensing Unit
ABB CSU-2LV 1SFA664002R5001 is a low-voltage current sensing unit for the TVOC-2 Arc Guard System, providing current-conditioned arc-flash protection with 0.25–4 kA nominal current measurement and Modbus RTU communication.
£1,164.62
Why Choose the ABB CSU-2LV Current Sensing Unit?
The ABB CSU-2LV, order code 1SFA664002R5001, is a low-voltage current sensing unit designed as an accessory for the ABB Arc Guard System TVOC-2. It adds current measurement as a second condition alongside optical arc detection, helping prevent nuisance tripping while maintaining the rapid response required for effective arc-flash protection.
The CSU-2LV supports connection of 1–4 ABB Rogowski coil current sensors to monitor L1, L2, L3 and Neutral. It covers a wide nominal current measurement range of 0.25–4 kA and an overcurrent range of 0.25–12 kA, making it suitable for a broad range of low-voltage switchgear and electrical distribution applications.
With a rated supply of 24–240 V AC or 24–250 V DC, Modbus RTU communication and configurable overcurrent and warning thresholds, the CSU-2LV provides flexible integration into modern protection systems. When no overcurrent condition or internal error is present, the unit sends a continuous optical signal to the TVOC-2, enabling light and current to be combined as conditions for arc-fault tripping.
Key Advantages
- Adds current sensing to the ABB TVOC-2 Arc Guard System.
- Dual conditioning of light and current helps prevent nuisance tripping.
- Supports 1–4 current sensors for measurement of L1, L2, L3 and Neutral.
- Wide 0.25–4 kA nominal current range for low-voltage applications.
- Detects overcurrent across a wide 0.25–12 kA range.
- Integrated Modbus RTU communication supports monitoring and configuration.
Key Features
- ABB CSU-2LV low-voltage current sensing unit.
- Designed for the ABB Arc Guard System TVOC-2.
- Compatible with ABB RC120 and RC200 Rogowski coil current sensors.
- Supports monitoring of L1, L2, L3 and Neutral.
- 0.25–4 kA nominal current measurement range.
- 0.25–12 kA overcurrent measurement range.
- 24–240 V AC / 24–250 V DC rated supply voltage.
- Configurable overcurrent level, warning current level and measured phases.
- Modbus RTU communication interface.
- K1 changeover signal relay for signalling overcurrent to other systems.
- Supports daisy chaining of current sensing units using compatible TVOC-2 optical accessories.
- Designed for low-voltage arc-flash protection applications.
Current-Conditioned Arc-Flash Protection
Optical arc detection provides extremely fast identification of an arc-flash event, but intense external light sources can potentially resemble the light produced by an electrical arc. The ABB CSU-2LV adds current as a second condition, allowing a compatible TVOC-2 installation to verify that an abnormal current increase accompanies the detected light before initiating the conditioned trip sequence.
The CSU-2LV uses compatible Rogowski coil sensors to measure current without the space requirements of conventional current transformers. Configurable warning and overcurrent levels, phase selection and Modbus RTU communication provide flexibility for commissioning and system integration, while the optical interface enables integration with the wider ABB Arc Guard architecture.
Typical Applications
- ABB TVOC-2 Arc Guard protection systems.
- Low-voltage switchgear and switchboards.
- Motor control centres.
- Industrial electrical distribution systems.
- Power distribution and control panels.
- Arc-flash protection systems requiring combined light and current detection.
Technical Specifications
Tick the specs you need, then view products that match.
| Monitoring Function | Current | |
|---|---|---|
| Series | CSU-2 / Arc Guard System TVOC-2 | |
| ABB order code | 1SFA664002R5001 | |
| Product group | Arc Guard Components | |
| Product type | Low-voltage current sensing unit | |
| Application | Current conditioning for ABB TVOC-2 Arc Guard systems | |
| Nominal current measurement range | 0.25–4 kA | |
| Overcurrent measurement range | 0.25–12 kA | |
| Number of current sensor inputs | 1–4 | |
| Measured conductors | L1, L2, L3 and Neutral | |
| Compatible LV current sensors | ABB RC120 and RC200 Rogowski coil sensors | |
| Rated supply voltage | 24–240 V AC / 24–250 V DC | |
| Communication | Modbus RTU | |
| Signal relay | K1 changeover contact | |
| Operating temperature | -25 to +70 °C | |
| Storage temperature | -25 to +85 °C | |
| Dimensions (H × W × D) | 141.1 × 155.5 × 63.8 mm | |
| Weight | approx. 0.42 kg | |
| EAN | 7320500524923 |
Frequently Asked Questions
What is the ABB CSU-2LV used for?
The ABB CSU-2LV is a low-voltage current sensing unit for the TVOC-2 Arc Guard System, adding current measurement as a second condition alongside optical arc detection to help prevent nuisance tripping.
What current range does the CSU-2LV measure?
The CSU-2LV measures a nominal current range of 0.25–4 kA and an overcurrent range of 0.25–12 kA.
How many current sensors can connect to the CSU-2LV?
The CSU-2LV accepts 1–4 compatible current sensors, enabling measurement of L1, L2, L3 and Neutral in low-voltage installations.
What supply voltage does the ABB CSU-2LV require?
The CSU-2LV has a rated supply voltage of 24–240 V AC or 24–250 V DC, providing flexibility for integration into industrial electrical systems.
Does the CSU-2LV support industrial communications?
Yes. The ABB CSU-2LV supports Modbus RTU, allowing settings and current-sensing information to be integrated with compatible monitoring and control systems.
Trusted ABB Arc Guard Protection
ABB CSU-2 current sensing technology complements the TVOC-2 Arc Guard System by combining rapid optical arc detection with current measurement, helping deliver selective and dependable arc-flash protection for low-voltage electrical installations.
