Product Description

The FN3 indoor load-break switch is designed for 50 Hz, 12 kV power distribution systems. It is primarily used in indoor distribution equipment and high-voltage cable lines within industrial facilities, warehouses, and other locations utilizing 12 kV distribution systems. The switch controls circuit making and breaking under specified operating conditions and is suitable for industrial power distribution and other applications requiring reliable switching equipment.

The FN3 indoor load break switch is often paired with current-limiting fuses to provide circuit protection, effectively safeguarding the system against short-circuit and overcurrent damage. The contact gap is clearly visible when the switch is open, enhancing safety for maintenance personnel - though strict adherence to relevant electrical operating procedures remains mandatory.

The FN3 indoor load break switch featuring standardized mounting dimensions and a robust, simple structure, the FN3 switch is easy to install and commission within power distribution systems. Users should verify mounting dimensions and interface specifications to ensure equipment compatibility. Switching operations (opening and closing) are performed manually. The reliable design of the mechanical components ensures stable and precise operation, making it well-suited for routine indoor power distribution applications.

Note: When selecting a model, users should comprehensively consider factors such as rated current, operational requirements, fuse specifications, and installation conditions. Proper selection and inspection contribute to safe equipment operation and effectively minimize potential issues during use.

Key Features

01/

Simple and reliable design. The device features an independent manual operating mechanism with clear "Close" and "Open" position indicators. The visible isolation gap created upon opening allows operators to confirm the circuit is de-energized, ensuring safety.

02/

Capable of interrupting load current; short-circuit protection is provided by fuses. Under normal operating conditions, it can interrupt the rated current; in the event of a short circuit, the associated high-voltage (current-limiting) fuse operates, triggering the load switch to open and isolate the faulty circuit.

03/

Comprehensive mechanical interlocking system to prevent misoperation. Built-in mechanical interlocks prevent hazardous actions - such as closing while energized or attempting to close while the grounding switch is engaged - thereby meeting the "five-prevention" safety requirements for high-voltage switchgear.

04/

Designed for manual operation with minimal maintenance requirements. It comes standard with a side-mounted manual operating handle, requiring no external power source for operation (opening or closing). The mechanical components are robust and durable, requiring very little routine maintenance.

05/

Excellent adaptability to switchgear enclosures. With its compact dimensions and standardized mounting hole layout, the unit can be installed directly into fixed-type high-voltage (12 kV) switchgear, making it suitable for both new installations and equipment replacement in retrofit projects.

Installation Dimensions

Main Technical Data

Item	Specification
Model	FN3 Indoor Load Break Switch
Rated Voltage	12kV
Rated Frequency	50Hz
Rated Current	400A / 630A
Short-time withstand current	12.5kA / 16kA, 2s
Application Environment	Indoor, installed inside high voltage switchgear
Operation Type	Manual operating mechanism

Application

Power distribution rooms for industrial and mining enterprises

Small-scale substations and distribution rooms in commercial buildings

Modernization and replacement projects for aging high-voltage switchgear

Compact substations (enclosure-type) and branch circuits for indoor power distribution

Packaging and Shipping

FAQ

Q: What is the difference between the FN3 and FN7 load break switches?

A: The FN3 model features a modular design with an external manual operating mechanism and a visible isolation gap, making it primarily suitable for fixed switchgear; the FN7 model is more compact, utilizes an internal operating mechanism, and is mainly used in Ring Main Units (RMU).

Q: Does the FN3 model come with an electric operating mechanism?

A: The FN3 model typically supports manual operation only, whereas the FN7 series offers an electric operation option.

Q: What certifications do you hold?

A: This product series has obtained CE and ISO certifications and comes with comprehensive type test reports. All products comply with relevant IEC standards for high-voltage power distribution equipment.

Q: How many different types of products does your company manufacture?

A: Our product range covers over 100 models of high- and low-voltage electrical equipment; additionally, we offer customized OEM services. You can provide product samples or technical specifications, and our engineering team will develop a manufacturing solution tailored to your requirements.

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