Chint CT-600A
The Chint CT-600A is a 600A/5A pass-through current transformer, accuracy class 1, designed for measuring high currents in large-scale industrial, commercial, and photovoltaic electrical installations. It is compatible with smart meters, ammeters, and energy meters with a 5A CT input. Rated voltage 660V, temperature range –5°C/+40°C.
The Chint CT-600A is a through-hole current transformer (CT) with a nominal primary current of 600 Amps, designed for precise measurement of high currents in large industrial, commercial, and photovoltaic electrical installations. With a secondary signal of 5A, it can be paired with smart meters, ammeters, protection systems, and energy meters.
Why is a 600A CT needed in a photovoltaic system?
In high-power C&I installations — large three-phase systems, medium-power panels, multi-inverter systems — the network current often exceeds 200 A and can reach up to 600 A. In these cases, standard CTs of 80 A or 200 A are not sufficient: a current transformer sized for the actual current is required. The Chint CT-600A is installed as a through-hole on the phase conductor (or on a busbar) and reduces the current to a 5A secondary signal compatible with any standard measuring instrument or protection system.
Chint CT-600A Technical Specifications
| Model | Chint CT-600A |
| Nominal primary current | 600 A |
| Secondary current | 5 A |
| Transformation ratio | 600/5 |
| Nominal voltage | 660 V (Chint BH-0.66 series) |
| Frequency | 50/60 Hz |
| Accuracy class | 1 |
| Safety factor (FS) | 10 |
| Installation type | Through-hole on cable or busbar |
| Ambient temperature | –5°C / +40°C |
| Humidity | ≤ 80% |
| Weight | 0.1 kg |
| Applications | Smart meters, ammeters, energy meters, protection relays, SCADA systems |
When should the CT-600A be used instead of standard smart meter CTs?
The CTs included with Chint DTSU666-CT smart meters (100A/33.33 mA) are suitable up to 200 A. When the network current exceeds 200 A — typical in commercial installations over 100 kW, large plants, industrial buildings, or main distribution panels — a higher capacity CT such as the Chint CT-600A is required. It can be paired with instruments with a standard 5A current input, including digital multimeters, wattmeters, and energy meters with CT input.
What is included in the supply?
- 1 Chint CT-600A current transformer (600A/5A)
- Mounting brackets and sealable terminal covers
Frequently Asked Questions
Is the Chint CT-600A compatible with Chint DTSU666 smart meters?
The DTSU666-CT series is designed for CTs with mA output (typically 100A/33.33 mA). The Chint CT-600A has a 5A secondary output, compatible with standard ammeter instruments (multimeters, wattmeters, meters with CT/5A input) but not directly with the CT ports of the DTSU666-CT Solax. For pairing with Solax smart meters, check the type of CT input supported; the CT-600A is intended for industrial measurement systems with a 5A secondary CT input.
How is the Chint CT-600A installed on the phase cable?
The Chint CT-600A is a through-hole CT: the phase conductor (or busbar) is passed through the toroidal core of the transformer, without the need to interrupt the circuit or cut the cable. The secondary terminals (5A) are connected to the current input of the measuring instrument or protection relay. Mounting brackets are included to secure the CT in the panel or on the support. Installation must be carried out by qualified electrical personnel.
What is the accuracy class of the CT-600A and what does it mean?
The Chint CT-600A has an accuracy class of 1, which indicates a maximum error of 0.5–1% in current measurement under nominal conditions. This class is suitable for energy measurement applications (billing, consumption monitoring, export management) but not for high-precision protection measurements that require class 0.1 or 0.2. For commercial photovoltaic monitoring applications, class 1 is the standard also adopted by Chint DTSU666 meters.
What types of photovoltaic systems use the CT-600A?
The Chint CT-600A is typically used in: commercial and industrial photovoltaic systems over 100 kW with network currents above 200A, main distribution panels of large buildings, multi-inverter systems with aggregation at the point of connection, and large-scale ground-mounted plants. It is paired with industrial energy meters with a 5A secondary CT input for measuring flows at the delivery point.
Must the secondary of the CT-600A always remain closed on a load?
Yes, this is a fundamental safety rule for all current transformers. The secondary of the Chint CT-600A must never be left open-circuited while the primary is carrying current: in open secondary conditions, dangerously high voltages are generated that can damage the instrument and pose an electrical hazard. Before disconnecting the measuring instrument, the secondary must always be short-circuited.
