ZN12-27.5B Single stage railway switchDetailed product description：

ZN12-27.5B single-stage railway switch is an indoor high-voltage switchgear with a rated voltage of 27.5kV and single-phase AC of 50Hz. This circuit breaker is of the handcart type and is equipped with handcart tracks and current transformers.

The ZN12-27.5B single-stage railway switch is suitable for various operating places such as substations, switching stations, partition pavilions, etc. with BT power supply mode of electrified railway traction power supply system.

Main technical parameters of ZN12-27.5B single-stage railway switch

serial number	project		unit	data
one	rated voltage		kV	twenty-seven point five
two	Maximum operating voltage		kV	thirty-one point five
three	Rated insulation level	One minute power frequency withstand voltage	kV	Normal type: 95 (110 between fracture surfaces) Plateau type: 110 (125 between fractures)
		Lightning impulse (peak value)	kV	185 260
four	rated current		A	1250,2000
five	Rated short-circuit breaking current		kA	25,31.5
six	Rated short-circuit breaking current breaking times		time	thirty
seven	Rated Dan furnace closing current (peak value)		kA	63,80
eight	Rated short-circuit duration		S	four
nine	Rated operating sequence			Min-0.3s HeFen-180s HeFen
ten	closing time		ms	≤75
eleven	Opening time		ms	≤60
twelve	Rated breaking current of capacitor bank		A	six hundred and thirty
thirteen	mechanical life		time	twenty thousand
fourteen	Allowable cumulative thickness of wear for dynamic and static contacts		mm	four
fifteen	Rated current ratio of current transformer			75～2000/1.5
sixteen	Overall dimensions		mm	Height 1675, depth 1220, width 690
seventeen	Total weight		kg	two hundred and sixty

ZN12-27.5B single-stage railway switch operating mechanism parameters

serial number	project	unit	data
one	Rated power of energy storage motor	W	two hundred and seventy-five
two	Rated voltage of energy storage motor	V	AC:110 220 DC:110 220
three	Energy storage time under rated working voltage	S	≤15
four	The rated voltage of the closing electromagnet is supplied by an independent power source, and the rated voltage of the opening electromagnet is also supplied	V	AC:110 220 DC:110 220
five	Rated current of overcurrent release device	A	five
six	Rated current of auxiliary switch	A	AC:10 DC:5
seven	Continuous current allowed to pass through microswitches	A	two
eight	Opening and closing current (DC220V, DC110V)	A	0.89,1.91