What are professional strip-type fuse disconnect switch current transformer?

In modern low-voltage power distribution systems, power companies and distribution operators face three core requirements:

secure isolation, reliable protection, and accurate current measurement.

Strip-type fuse switch disconnectors are widely used in power company feeder cabinets, customer access cabinets, and low-voltage distribution boxes for load isolation and short-circuit protection. However, they cannot tell us

I need to know how much electricity is flowing on the line. I need to know if the line is overloaded. I need to know if the circuit is unbalanced.

This is precisely the significance of the SFCT series current transformer.

The current sensor is a sensor. I install the sensor inside strip-type fusible disconnect switches.

1.A structure inherently designed for strip disconnect switches

I have seen that traditional current transformers are large. The large traditional current transformers need mounting brackets and extra wiring space. Strip-type fuse disconnect switches have internal space.

• narrow cabinet
• Busbar compact
• Concentrated fever
• Small maintenance space

When I look at the SFCT I see a window type, structure. You can install the SFCT directly on the busbar. You can also install the SFCT on the cable, inside the disconnector switch. You do not need to change the switch structure, for the SFCT.

This means:

No additional CT mounting box required

No extra cabinet space is needed.

In my experience the switch body structure does not change.

I think SFCT belongs to the “system. SFCT is not an add‑on.

2.Remains stable during closing, opening, and fuse replacement.

The core task of a strip-type fuse disconnector is

to safely open and close the circuit under load and fault conditions.

This will produce:

• High current surge
• drastic changes in magnetic field
• Transient surge

I notice that the ordinary CT scanners tend to have distortion in those environments. The SFCT is built for this use. The SFCT keeps output when switching operations happen and load changes.

This is critical to the system because:

The protection relay depends on the signal. The protection relay decides if the protection relay should trip.

I know that the electricity meters rely on it for measurement. The electricity meters need it to measure accurately.

In my work I see that automation systems rely on a connection, for control. Automation systems use the connection to run machines from away.

3. I have found that a single SFCT can turn the disconnector switch into a node.

When I add SFCT to the strip‑type disconnector the switchgear that was purely mechanical instantly gets three capabilities:

① Feeder current monitoring

Real-time detection is possible.

Overload

Three-phase imbalance

Abnormal electricity usage

② Protection and Automation

SFCT gives a signal for:

Overcurrent protection

Fault detection

Remote tripping and reclosing

To enable ordinary power distribution cabinets to have “smart grid” capabilities.

③ Metering and Energy Management

SFCT gives the 0.5 grade accuracy or the 1 grade accuracy. SFCT helps with:

Billing

Load Analysis

Energy Management

This means that a single switch can simultaneously perform:

protection, metering, and data acquisition.

Why does the power company especially favor this combination?

Power companies are upgrading to smart low‑voltage switchgear. Power companies see uses, for the switchgear, such, as:

Roadside feeder cabinet

Residential and commercial user access cabinets

Small low-voltage substation

Distribution automation terminal

They require:

High security

Fewer wires

Low maintenance

Multiple data

We install the SFCT directly inside the fuse disconnect switch. The SFCT avoids the problems that come with CTs.

Incorrect wiring

Insufficient space

High installation costs

Increased number of potential failure points

I think the power company likes this structured solution. The power company finds the structured solution useful.

1.SFCT + Strip-type Fuse Disconnect Switch = Next-Generation Power Distribution Unit

When you combine a strip-type disconnector, with an SFCT, the strip-type fusible disconnector and the SFCT no longer act as a switch. The strip-type fusible disconnector and the SFCT become a:

I use a low-voltage power distribution node in my projects. The low-voltage power distribution node is a device. The low-voltage power distribution node combines protection, measurement, monitoring and automation.

This is precisely the future direction of power distribution network development:

• Visualization
• Digitalization
• High reliability
• Low maintenance

SFCT is not “barely usable here”,but a current transformer specifically designed for this application.

Compay：HEYI Electrical Co., Ltd.

Brand: HEYI/ASCT

Contact: Bethy

E-mail: heyi@heyiele.com             

Tel: 86-13968747975

--- END ---