12kv Medium Voltage 630A Air Load Break Switch

• Customization: Available
• Function: Industry
• Structure: as Specification
• Model NO.: FN18-12
• Usage: as Specification
• Contact Type: as Specification
• Detection Method: as Specification
• Pole: 3
• Rated Continuous Current: 630A
• Number of Switch: as Specification
• Brand: Liyond
• Certification: ISO9001
• Product Name: Fn18 Load Break Switch
• Voltage Level: Medium Voltage
• Rated Current: 630A
• Application: High Voltage Switchgear
• OEM: Accept
• Transport Package: Standard Export Packaging
• Specification: 12kV
• Trademark: Liyond
• Origin: China
• Package Size: 110.00cm * 105.00cm * 62.00cm
• Package Gross Weight: 132.000kg

Product Description

Yueqing Liyond Electric Co., Ltd. presents the FN18 series Indoor High Voltage Load Break Switch with Nalf Air Insulation. Ideal for medium voltage applications, this 630A switch combines breaker fuses for efficient operation.

 

The FN18-12 Load Break Switch is an indoor, air-insulated, three-position switch designed for medium voltage systems up to 12kV. It provides safe and reliable switching, isolation, and grounding functions in compact switchgear installations such as RMUs and metal-clad switchgear.

Its compact size, modular design, and arc-extinguishing capability make it ideal for modern MV distribution systems requiring efficient space use and safe maintenance operations.

 

Key Features

• Three-position design: ON / OFF / EARTH for full operational safety

• Air-insulated structure: Safe, proven, low maintenance

• Compact dimensions: Space-saving design for panel integration

• Strong arc-quenching chamber: Ensures safe switching under load

• Modular structure: Easy installation, maintenance, and replacement

• Mechanical interlock: Prevents misoperation between positions

• High mechanical endurance: Reliable over thousands of operations

• Optional fuse base: Available for overload protection configurations

Application

• Ring Main Units (RMU)

• Metal-enclosed switchgear panels

• Compact substations

• Medium voltage distribution networks (indoor use)

• Retrofit or replacement of legacy switches (e.g., NAL/NALF types)

 

Technical Parameters:

Rated voltage		Unit	12kV			17.5kV			24kV			36kV			40.5kV
Rated current		A	400	630	1250	400	630	1250	400	630	1250	630	800	1000	630	800	1000
Max. rated current		A	400	630	1250	400	630	1250	400	630	1250	630	800	800	630	800	800
Short circuit making capacity		KA peak	67			50			50			50			50
Peak withstand current		KA peak	82			82			82			66			66
Short time current	1 sec.	KA eff	31.5 25 20	31.5 25 20	31.5 25 20	31.5 25	31.5 25	31.5 25	25 25 16	25 25 16	31.5 25 16	25	25	25	25	25	25
	2 sec.
	3 sec.
Mainly active load breaking capacity 21 (test duty 1 and, IEC 60265-1( 265))		A	400	630	1250	400	630	1250	400	630	1250	630	800	630	800	630	800
Mainly capacitive breaking capacity (test duty 4, IEC 60265-1 (IEC 265))		A	150			45			80			50			50
Mainly inductive breaking capacity cosφ=0.15		A	16			16			16			16			16
Max. breaking capacity in co-operation with fuses IEC 62271-105(IEC 420 1990-11)		A	1600	1600		1600	1600		900	900		300	300	300	300	300	300
Power frequency withstand voltage 50 Hz 1 min. -to earth and between poles -across isolating distance		kV	42 45			45 60			55 70			80 88			95 120
Impulse withstand voltage 1.2/50 μs - to earth and between poles - across isolating distance		kV	75 85			95 110			125 145			170 195			190 220
Pole distance		mm	150, 170, 210			170, 210			170, 235, 275			360			360
Max. operating torque at: -closing K/A mech. -opening K/A mech.		Nm	115-120 Nm K-mech.120 Nm/A-mech. 3Nm									80-100 Nm K-mech.80-100 Nm
Operating angle on the shaft		degree	130									120
Opening time		ms	40-60									60

Introducing the Medium Voltage 630A Load Break Switch from Yueqing Liyond Electric Co., Ltd. Ideal for high voltage applications, this switch combines reliability and affordability.

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