Live tank SF6 gas circuit breaker-40.5kV to 363kV

Attributes Description Documentation Resource Library

Key attributes

Brand	ROCKWILL
Model NO.	Live tank SF6 gas circuit breaker-40.5kV to 363kV
Rated voltage	72.5kV
Rated frequency	50/60Hz
Series	RHB

Description

Description ：

The RHB type Live tank SF6 gas circuit breaker is specifically designed for outdoor high - voltage environments. Utilizing self - blast arc - extinguishing technology and taking advantage of the excellent insulating and arc - extinguishing properties of SF₆ gas, it can quickly quench arcs, ensuring the efficient interruption of fault currents. With a compact and robust structure, it can adapt to various harsh weather conditions. It boasts high reliability and a long service life, which can significantly reduce maintenance frequency, making it a key device for enhancing the safety and stability of power systems.

Main function introduction:

SF6 gas is used for arc extinguishing
Monitor with a pointer-type density relay
Adopt the self-blast arc extinguishing principle
Adopt pointer-type density relays for pressure and density monitoring

Technology parameters:

RHB-40.5

Item	Unit	Parameter
Rated voltage	kV	40.5
Rated frequency	Hz	50/60
Rated current	A	up to 4000
Rated short-time withstand current, up to 3 s	kA	up to 63
Rated peak withstand current	kA	80
Rated short-duration power-frequency withstand voltage( 1 min)	kV	95
Power-frequency withstand voltage( 1 min ),across open contacts	kV	95
Rated lightning impulse withstand voltage 1.2/50 us	kV	200
Rated lightning impulse withstand voltage 1.2/50 us， across open contacts	kV	250
Rated filling pressure (abs. at 20℃) circuit-breaker/other components	Mpa	0.5
Minimum functional pressure (abs. at 20℃) circuit-breaker/other components	Mpa	0.4
Temperature range (ambient)	℃	-30...+40
Type of installation		outdoor
Partial discharge capacity	PC	<5
SF6 leakage rate per year		<0.5%
Maintenance cycle	Year	30

RHB-72.5

Item	Unit	Parameter
Rated voltage	kV	72.5
Rated frequency	Hz	50
Rated current	A	up to 4000
Rated short-time withstand current, up to 3 s	kA	up to 63
Rated peak withstand current	kA	100
Rated short-duration power-frequency withstand voltage( 1 min)	kV	140
Power-frequency withstand voltage( 1 min ),across open contacts	kV	160
Rated lightning impulse withstand voltage 1.2/50 us	kV	325
Rated lightning impulse withstand voltage 1.2/50 us， across open contacts	kV	375
Rated filling pressure (abs. at 20℃) circuit-breaker/other components	Mpa	0.5/0.6
Minimum functional pressure (abs. at 20℃) circuit-breaker/other components	Mpa	0.5/0.5
Temperature range (ambient)	℃	-30...+40
Type of installation		outdoor
Partial discharge capacity	PC	<5
SF6 leakage rate per year		<0.5%
Maintenance cycle	Year	30

RHB-123/145

Item	Unit	Parameter
Rated voltage	kV	123	145
Rated frequency	Hz	50/60
Rated current	A	up to 4000
Rated short-time withstand current, up to 3 s	kA	up to 63
Rated peak withstand current	kA	100
Rated short-duration power-frequency withstand voltage( 1 min)	kV	230	275
Power-frequency withstand voltage( 1 min ),across open contacts	kV	265	315
Rated lightning impulse withstand voltage 1.2/50 us	kV	550	650
Rated lightning impulse withstand voltage 1.2/50 us， across open contacts	kV	650	750
Rated filling pressure (abs. at 20℃) circuit-breaker/other components	Mpa	0.6
Minimum functional pressure (abs. at 20℃) circuit-breaker/other components	Mpa	0.5
Temperature range (ambient)	℃	-30...+40
Type of installation		outdoor
Partial discharge capacity	PC	<5
SF6 leakage rate per year		<0.5%
Maintenance cycle	Year	30

RHB-170

Item	Unit	Parameter
Rated voltage	kV	170
Rated frequency	Hz	50/60
Rated current	A	up to 4000
Rated short-time withstand current, up to 3 s	kA	up to 63
Rated peak withstand current	kA	125
Rated short-duration power-frequency withstand voltage( 1 min)	kV	275
Power-frequency withstand voltage( 1 min ),across open contacts	kV	315
Rated lightning impulse withstand voltage 1.2/50 us	kV	650
Rated lightning impulse withstand voltage 1.2/50 us， across open contacts	kV	750
Rated filling pressure (abs. at 20℃) circuit-breaker/other components	Mpa	0.5
Minimum functional pressure (abs. at 20℃) circuit-breaker/other components	Mpa	0.4
Temperature range (ambient)	℃	-40...+40
Type of installation		outdoor
Partial discharge capacity	PC	<5
SF6 leakage rate per year		<0.5%
Maintenance cycle	Year	30

RHB-252

Item	Unit	Parameter
Rated voltage	kV	252
Rated frequency	Hz	50/60
Rated current	A	up to 4000
Rated short-time withstand current, up to 3 s	kA	up to 63
Rated peak withstand current	kA	100/125
Rated short-duration power-frequency withstand voltage( 1 min)	kV	460
Power-frequency withstand voltage( 1 min ),across open contacts	kV	530
Rated lightning impulse withstand voltage 1.2/50 us	kV	1050
Rated lightning impulse withstand voltage 1.2/50 us， across open contacts	kV	1200
Rated filling pressure (abs. at 20℃) circuit-breaker/other components	Mpa	0.6/0.6
Minimum functional pressure (abs. at 20℃) circuit-breaker/other components	Mpa	0.5/0.5
Temperature range (ambient)	℃	-30...+40
Type of installation		outdoor
Partial discharge capacity	PC	<5
SF6 leakage rate per year		<0.5%
Maintenance cycle	Year	30

RHB-363

Item	Unit	Parameter
Rated voltage	kV	363
Rated frequency	Hz	50/60
Rated current	A	up to 4000
Rated short-time withstand current, up to 3 s	kA	up to 63
Rated peak withstand current	kA	100/125
Rated short-duration power-frequency withstand voltage( 1 min)	kV	450
Power-frequency withstand voltage( 1 min ),across open contacts	kV	520
Rated lightning impulse withstand voltage 1.2/50 us	kV	1175
Rated lightning impulse withstand voltage 1.2/50 us， across open contacts	kV	1175
Rated filling pressure (abs. at 20℃) circuit-breaker/other components	Mpa	0.6
Minimum functional pressure (abs. at 20℃) circuit-breaker/other components	Mpa	0.5
Temperature range (ambient)	℃	-30...+40
Type of installation		outdoor
Partial discharge capacity	PC	<5
SF6 leakage rate per year		<0.5%
Maintenance cycle	Year	30

Device structure:

RHB-40.5

RHB type Live tank SF6 gas circuit breaker.png

RHB-72.5

72.5kV RHB type Live tank SF6 gas circuit breaker.jpg

RHB-123/145

123/145kV RHB type Live tank SF6 gas circuit breaker.jpg

RHB-170

170kV RHB type Live tank SF6 gas circuit breaker.jpg

RHB-252

252kV RHB type Live tank SF6 gas circuit breaker.jpg

RHB-363

363kV RHB type Live tank SF6 gas circuit breaker.png

40.5kV/72.5kV/145kV/170kV/252kV/363kV Live tank SF6 gas circuit breaker

Solutions for Live tank

SF6 Circuit Breaker Seal Failure Analysis and HNBR Upgrade Strategy for Venezuela 24kV Network

Core Challenge: The 24kV outdoor SF6 circuit breakers operated by Venezuela's National Electric Corporation (CORPOELEC), under the C5-M high salt mist corrosion environment along the Lake Maracaibo coast and an annual average temperature of 32°C, experience accelerated O-ring compression set, causing the SF6 annual leakage rate to deteriorate from the design value of ≤0.1% to over 1% in actual operation, frequently triggering low-pressure lockout alarms. This is one of the key contributin

Rockwill

Documentation Resource Library Live tank

Restricted.

RHB Hybird Switchgear Catalog

Selection Guide

English

Consulting

FAQ for Live tank

Q: How to choose the voltage level of High-Voltage Dead tank SF6 circuit breaker?

Select the dead tank sf6 circuit breaker corresponding to the voltage level based on the power grid level
The standard voltage is matched with the corresponding nominal voltage of the power grid. For example, for a 35kV power grid, a 40.5kV dead tank sf6 circuit breaker is selected. According to standards such as GB/T 1984-2024、IEC 62271-100:2021, the rated voltage is ensured to be ≥ the maximum operating voltage of the power grid.
Applicable scenarios for non-standard customized voltage
Non standard customized voltage is used for special power grids, such as the renovation of old power grids and specific industrial power scenarios. Due to the lack of suitable standard voltage, manufacturers need to customize according to power grid parameters, and after customization, insulation and arc extinguishing performance must be verified.
The consequences of selecting the wrong voltage level
Choosing a low voltage level can cause insulation breakdown, leading to SF6 leakage and equipment damage; Choosing a high voltage level significantly increases costs, increases operational difficulties, and may also result in performance mismatch issues.

Q: What are the core differences between live tank circuit breakers and dead tank circuit breaker?

The core differences between porcelain column circuit breakers and dead tank circuit breaker—two main structural types of high-voltage circuit breakers—lie in six key aspects.
Structurally, porcelain column types are supported by porcelain insulation pillars, with open-layout components like arc extinguishing chambers and operating mechanisms. Tank types use metal-sealed tanks to encapsulate and highly integrate all core parts.
For insulation, the former relies on porcelain pillars, air, or composite insulating materials; the latter combines SF₆ gas (or other insulating gases) with metal tanks.
Arc extinguishing chambers are mounted on the top or pillars of porcelain columns for the former, while built inside metal tanks for the latter.
In application, porcelain column types suit outdoor high-voltage distribution with a dispersed layout; tank types adapt flexibly to indoor/outdoor scenarios, especially space-constrained environments.
Maintenance-wise, the former’s exposed components enable targeted repairs; the latter’s sealed structure reduces overall maintenance frequency but requires full inspections for local faults.
Technically, porcelain column types offer intuitive structure and strong anti-pollution flashover performance, while tank types boast excellent sealing, high SF₆ insulation strength, and superior resistance to external interference.

Q: What is the difference between vacuum circuit breaker and SF6 circuit breaker？

Their core difference is arc-extinguishing media: Vacuum Auto Circuit Recloser use high vacuum (10⁻⁴~10⁻⁶Pa) for insulation and arc extinction; SF₆ breakers rely on SF₆ gas, which adsorbs electrons well to quench arcs.
In voltage adaptation: Vacuum Auto Circuit Recloser fit medium-low voltages (10kV, 35kV; some up to 110kV), rarely 220kV+. SF₆ breakers suit high-ultra high voltages (110kV~1000kV), mainstream for ultra-high voltage grids.
For performance: Vacuum Auto Circuit Recloser extinguish arcs fast (<10ms), have 63kA~125kA breaking capacity, suit frequent use (e.g., power distribution) with long life (>10,000 cycles). SF₆ breakers excel in stable large/inductive current breaking but work less frequently, needing insulation recovery time post-extinction.
Compared to SF6 gas circuit breakers, Vacuum Auto Circuit Recloser can achieve zero greenhouse gas emissions and are more environmentally friendly because the arc extinguishing device does not contain any gas

Negotiable

Pricing calculator

Model

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.