ZN42-27.5 railway-specific vacuum circuit beaker is handcart structure and can be equipped with a special current transformer (LZZBJ-27.5) on the handcart. The design and manufacturing of this product comply with JB6463-92 "Technical Conditions for Circuit Breakers Used in Electrified Railways".

ZN42-27.5 railway-specific vacuum circuit beaker is suitable for electrified railway power supply systems with a rated voltage of 27.5kV and single-phase AC 50Hz, and it serves as a special switch for breaking/making load and breaking fault current. It can be installed individually within a grid interval or mounted in a JYN-27.5 switchgear. The operating mechanism of this product is a spring energy storage type. It can be electrically operated by AC or DC power, or manually operated.

Product Specifications

Specification Sheet

No.	Name	Unit	Data
1	Rated Voltage	kV	27.5
2	Rated Frequency	Hz	50
3	Rated Current	A	1250/1600/2000/2500
4	Rated Power Frequency Withstand Voltage	kV	95
5	Rated Lightning Impulse Withstand Voltage	kV	185
6	Rated Short-Circuit Breaking Current	kA	25/31.5
7	Rated Short-Circuit Making Current (Peak)	kA	63/80
8	Rated Withstand Current (Peak)	kA	63/80
9	Rated Duration of Short-Circuit	s	4
10	Operating Cycles at Rated Short-Circuit Breaking Current	Cycles	E2
11	Mechanical Endurance	Times	10000
12	Standard Operating Sequence	-	O-0.3s-CO-180s-CO
13	Allowable Wear Thickness of Contact	mm	≤3

Mechanical characteristics

No.	Name	Unit	Data
1	Clearance between Moved and Fixed Contact	mm	16±1
2	Contact Overtravel	mm	4±1
3	Average Closing Speed	m/s	0.8±0.2
4	Average Opening Speed (Average Speed of First Opening at 12mm)	m/s	1.7±0.3
5	Rated Contact Pressure	N	3100±200N (25kA/31.5kA)
6	Closing Time	ms	30～70
7	Opening Time	ms	20～50
8	Contact Bouncing Duration at Closing Operation	ms	≤3
9	No-Simultaneity of Closing/Opening Operations of 3-Phase	ms	≤2

Product Advantages

ZN42-27.5 railway-specific vacuum circuit beaker has many advantages:

Performance of circuit breaker

E2-C2-M2

Convenient maintenance

the modular mechanism design allows for easy replacement of the closing and opening coils without the need for dismantling other components. This eliminates the need for testing or adjustment after replacement, ensuring users to replace them independently, making subsequent maintenance more convenient.

High conductivity performance

the main conductive circuit adopts a high-performance vacuum interrupter, providing a long electrical life.

Supports intelligent customization

it can be specially equipped with online monitoring devices to enhance system stability.