High voltage indoor SF6 gas circuit breaker 17kV 24kV 36kV

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Key attributes

Brand	ROCKWILL
Model NO.	High voltage indoor SF6 gas circuit breaker 17kV 24kV 36kV
Rated voltage	17kV
Rated normal current	800A
Rated frequency	50/60Hz
Series	HM4

Product descriptions from the supplier

Description

General

The HR4 series indoor high-voltage SF6 gas circuit breaker features two installation modes: drawable and fixed. It is widely applied in three-phase AC power systems with a rated voltage of 3.3kV to 36kV and a frequency of 50/60Hz, and is especially suitable for scenarios including power plants, transformer substations, petrochemical industry, metallurgy, manufacturing, airports, residential areas and more.

As a high-performance switchgear, it can minimize over-voltage and harmonic impulse during normal or fault-based switching operations (both breaking and making). It is fully interchangeable with switchgear models such as VD4, SF1 and HD4, which are commonly used in configurations like KYN28, AMS, and ABB’s ZS1 series.

This circuit breaker is manufactured in compliance with the following industry standards:

IEC62271-100 AC high voltage circuit breaker
GB1984-2003 AC high voltage circuit breaker
JB3855 3.6-40.5kV indoor AC high voltage circuit breaker
DL/T403 Specification of 12-40.5kV indoor high voltage vacuum circuit breaker

Core Features

Adopts autopuffer breaking technology for reliable arc extinction
Achieves electric arc extinction without chopped current
Ensures no restriking after breaking operations
Enables rapid recovery of the dielectric performance of the arc-extinguishing medium
Maintains insulation voltage withstand capacity even at zero relative pressure (*)
Capable of breaking up to 30% of the rated breaking capacity at zero relative pressure (*)
Features sealed-for-life poles for long-term stability
Undergoes three gas tightness tests per unit for guaranteed airtightness
Compact overall dimensions for flexible installation
Available in both fixed and withdrawable versions
Equipped with a stored energy operating mechanism with a standard anti-pumping device, unified across the entire circuit breaker series
Fitted with mechanical safety locks to prevent misoperation
Easy customization with a full range of optional accessories
Realizes maintenance-free operation during the service life
Optional SF6 gas pressure control device is available on request

Technical data

SF6 circuit-breaker		HM4-12	HM4-17	HM4-24	HM4-36	HM4-40
Standards		IEC 62271-100 CEI 17-1 (file 1375)
Rated voltage	Ur [kV]	12	17.5	24	36	40.5
Rated insulation voltage	Us [kV]	12	17.5	24	36	40.5
Withstand voltage at 50 Hz(1min)	Ud [kV]	28	38	50	70	95
Impulse withstand voltage	Up [kV]	75	95	125	170	185
Rated frequency	Fr [Hz]	50/60
Rated normal current (40 °C)	Ir [A]	630/800/1250/1600/2000/2500/3150/3600
Rated breaking capacity	Isc [kA]	12.5/16/25/31.5/40/50
Rated short-time	Ik [kA]	12.5/16/25/31.5/40/50
Making capacity	Ip [kA]	31.5/40/50/63/80/100/125
Operation sequence		O-0.3s-CO-15s-CO
Opening time	[ms]	45	45	45	45	45
Arcing time	[ms]	10~15	10~15	10~15	10~15	10~15
Total breaking time	[ms]	55~60	55~60	55~60	55~60	55~60
Closing time	[ms]	80	80	80	80	80
Maximum overall dimensions	H [mm]	640	649	818	730/1060	790/1123
	W[mm]	493	618	730	880/955	748/805
	D [mm]	496	496	620	695	833
Pole centre distance	I [mm]	150	210	275	350	275
Weight	[kg]	114	114	119	128	190
Absolute SF6 gas pressure	[kPa]	380	380	380	380	450
Operating temperature	[°C]	-5~+40
Tropicalization		IEC: 60068-2-30, 60721-2-1
Electromagnetic compatibility		IEC: 60694

Service environment

Air temperature: Maximum temperature: +40°C; Minimum temperature:-25°C
Humidity: Monthly average humidity 95%; Daily average humidity 90% .
Altitude above sea level: Maximum installation altitude: 2500m
Ambient air not apparently polluted by corrosive and flammable gas, vapor etc.
No frequent violent shake

Fields of Application

The HR4 circuit breakers are used in power distribution systems to control and protect power lines, transformer and distribution substations, motors, transformers, capacitor banks and other electrical equipment.

Benefiting from the SF6 autopuffer breaking technology, the HR4 circuit breakers generate no operating overvoltages, making them highly suitable for the retrofitting, upgrading and expansion of aging installations—where insulating materials of motors, cables and other equipment are typically more sensitive to dielectric stress.

Breaking Technology

The breaking technology of the HR4 circuit breakers integrates compression and self-blast technologies, delivering top-tier performance across all service current values. It ensures minimal arc duration, gradual arc extinction without current chopping, and eliminates restriking and operating overvoltages entirely.

The HR4 series brings the advantages of the mature "autopuffer" breaking technology—originally applied in high-voltage systems—to the medium-voltage power distribution field, optimizing switching performance and system safety.

Standards & Approvals

The HR4 circuit breakers comply with IEC 62271-100, CEI 17-1 file 1375, as well as the relevant standards of major industrialized countries worldwide. All units have passed a full set of rigorous tests to ensure safe and reliable operation in various installation scenarios.

Type Tests

Heating test, industrial and impulse frequency insulation withstand test, short-time and peak withstand current test, mechanical endurance test, short-circuit current making and breaking test.

Individual Tests

Industrial frequency voltage insulation test for main circuits, insulation test for auxiliary and control circuits, main circuit resistance measurement, mechanical and electrical operation test.

In addition, the HR4 circuit breakers are tested in accordance with IEC 62271-100 Standard (Class E2 - Table 21), and are certified suitable for use in overhead power lines with a rapid reclosing cycle.

Service Safety

A complete range of optional mechanical and electrical locks allows for the construction of high-safety distribution switchgear with HR4 circuit breakers. These locking devices are specially designed to prevent misoperation and facilitate safe inspection and maintenance of the installation, ensuring maximum personal safety for operators.

Negotiable

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Model

HM4-17/800

Warranty by

Whole life care manager

Whole-life care management services for equipment procurement, use, maintenance, and after-sales, ensuring safe operation of electrical equipment, continuous control, and worry-free electricity consumption.

The equipment supplier has passed platform qualification certification and technical evaluation, ensuring compliance, professionalism, and reliability from the source.

High voltage indoor SF6 gas circuit breaker 17kV 24kV 36kV

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Description

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