K18-7.2(F-C) indoor combination appliance is an indoor switch equipment with a rated voltage of 7.2kV and an AC frequency of 50/60Hz. It is mainly used in KYN18C-12 armored removable AC metal-enclosed switchgear in a parallel F-C circuit structure, serving as a combined power distribution device in power systems with rated voltage ranging from 3.6kV to 7.2kV. It is designed to control and protect motors up to 1200kW and transformers up to 1600kVA.

Product Specifications

Specification Sheet

No.	Name	Unit	Data
1	Rated Voltage	kV	3.6~7.2
2	Rated Frequency	Hz	50/60
3	Prospective Short-Circuit Breaking Current	kA	40
4	Rated Current	A	Up to 275
5	Rated Thermal Stability Current (4s)	kA	4
6	Permissible Current (0.01s)	kA	4 (Peak)
7	Rated PowerFrequency Withstand Voltage	kV	32
8	Rated Lightning Impulse Withstand Voltage	kV	60
9	Mechanical Endurance	Times	100,000 (Mechanical Latch) 300,000 (Electromagnetic Hold)

Mechanical Characteristics

No.	Name	Unit	Data
1	Clearance between Moved and Fixed Contact	mm	4.5±0.5
2	Contact Overtravel	mm	1.5±0.5
3	Closing Time	ms	≤200
4	Opening Time	ms	≤150
5	No-Simultaneity of Closing/Opening Operations of 3-Phase	ms	≤3
6	Minimum Pull-in Voltage	V	≤80%Us
7	Maximum Dropout Voltage	V	10%~70%Us

Basic Technical Parameters of the Fuse

Fuse Model	Rated Voltage	Prospective Breaking Current	Rated Current
XRNM1-7.2	7.2kV	40kA ,50kA	40;50;63;80;100;125;160;
			200;224;250;275

Product Advantages

K18-7.2(F-C) indoor combination appliance has many advantages:

Extremely long mechanical life

Uses mechanical latch contactors with an operating life of up to 100,000 cycles; electromagnetic hold contactors have an operating life of up to 300,000 cycles.

Compact design

Redesigned conductive circuit layout allows the chassis truck to match the cabinet width, minimizing it to 500mm.

Comprehensive operating interlocks

When used with specialized switchgear, the F-C chassis truck provides reliable and complete five-prevention interlocks.

Rapid Protection Performance

Uses a tripping mechanism triggered by the high-voltage fuse's striker pin, ensuring the contactor reliably trips when the fuse blows, providing maximum load protection.