1. General The vacuum contactor is mainly used in the power system with AC 50Hz and rated voltage 7.2kV, for making or breaking circuit and to make electromagnetic starter with suitable protective device and F-C switchgear. 2. Working condition: 1) Altitude should not be over 1,000m; 2) Ambient temperature: -5~40°C; 3) Average temperature in 24 hour not exceed 35°C; 4) When the highest temperature is 40°C, the relative humidity should not be higher than 50%; 5) Pollution degree: class 3 Main models and technical parameters Rated voltage: 7.2 kv Control voltage: 380/220/110 Rated current: 630A Clearance: 3.5±0.3 mm Over travel: 2±0.2 mm Pressure: >85N Main circuit power frequency withstand voltage: 32000 v Auxiliary circuit power frequency withstand voltage: 2500 v Control circuit power frequency withstand voltage: 2000 v Making capacity: 10Ie,100 times Breaking capacity: 8Ie,25 times Limit opening current(A): 10Ie Overload: 8Ie,10 s Mechanism life: 1 million times Weight: 25.5 KG Note: Ie represents the rated current of main circuit
HVJ3 12KV VACUUM CONTACTOR Detailed product description: The vacuum contactor is mainly used in the power system with AC 50Hz and rated voltage 12kV, for making or breaking circuit and to make electromagnetic starter with suitable protective device and F-C switchgear. Working condition: 1) Altitude should not be over 1,000m; 2) Ambient temperature: -5~40°C; 3) Average temperature in 24 hour not exceed 35°C; 4) When the highest temperature is 40°C, the relative humidity should not be higher than 50%; 5) Pollution degree: class 3 .Main models and technical parameters Rated voltage: 12 KV Control voltage: 220/110/380 Rated current: 160A, 250A, 400A, 630A Clearance: 5±0.5 mm Over travel: 2±0.2 mm Pressure: >85N Main circuit power frequency withstand voltage: 42000 v Auxiliary circuit power frequency withstand voltage: 2500 v Control circuit power frequency withstand voltage: 2000 v Making capacity: 10Ie,100 times Breaking capacity: 8Ie,25 times Limit opening current(A): 10Ie Overload: 8Ie,10 s Mechanism life: 1 million times Weight: 30KG Note: “Ie” represents the rated current of main circuit
1. General The vacuum contactor is mainly used in the power system with AC 50Hz and rated voltage 7.2kV, for making or breaking circuit and to make electromagnetic starter with suitable protective device and F-C switchgear. 2. Working condition: 1) Altitude should not be over 1,000m; 2) Ambient temperature: -5~40°C; 3) Average temperature in 24 hour not exceed 35°C; 4) When the highest temperature is 40°C, the relative humidity should not be higher than 50%; 5) Pollution degree: class 3 Main models and technical parameters Rated voltage: 7.2 kv Control voltage: 380/220/110 Rated current: 630A Clearance: 3.5±0.3 mm Over travel: 2±0.2 mm Pressure: >85N Main circuit power frequency withstand voltage: 32000 v Auxiliary circuit power frequency withstand voltage: 2500 v Control circuit power frequency withstand voltage: 2000 v Making capacity: 10Ie,100 times Breaking capacity: 8Ie,25 times Limit opening current(A): 10Ie Overload: 8Ie,10 s Mechanism life: 1 million times Weight: 25.5 KG Note: Ie represents the rated current of main circuit
HVJ3 12KV VACUUM CONTACTOR Detailed product description: The vacuum contactor is mainly used in the power system with AC 50Hz and rated voltage 12kV, for making or breaking circuit and to make electromagnetic starter with suitable protective device and F-C switchgear. Working condition: 1) Altitude should not be over 1,000m; 2) Ambient temperature: -5~40°C; 3) Average temperature in 24 hour not exceed 35°C; 4) When the highest temperature is 40°C, the relative humidity should not be higher than 50%; 5) Pollution degree: class 3 .Main models and technical parameters Rated voltage: 12 KV Control voltage: 220/110/380 Rated current: 160A, 250A, 400A, 630A Clearance: 5±0.5 mm Over travel: 2±0.2 mm Pressure: >85N Main circuit power frequency withstand voltage: 42000 v Auxiliary circuit power frequency withstand voltage: 2500 v Control circuit power frequency withstand voltage: 2000 v Making capacity: 10Ie,100 times Breaking capacity: 8Ie,25 times Limit opening current(A): 10Ie Overload: 8Ie,10 s Mechanism life: 1 million times Weight: 30KG Note: â??Ieâ?? represents the rated current of main circuit Model Rated voltage(v) Rated current ï¼?Main circuitï¼?(A) Parameter of main contacts Power frequency Withstand voltage V(effective value) Main circuit Control circuit Clearance (mm) Over travel (mm) pressure (N) Main circuit Auxiliary circuit Control circuit HVJ3-12/160 12000 220/110/380 160 5±0.5 2±0.2 >85N 42000 2500 2000 HVJ3-12/250 12000 220/110/380 250 5±0.5 2±0.2 >85N 42000 2500 2000 HVJ3-12/400 12000 220/110/380 400 5±0.5 2±0.2 >85N 42000 2500 2000 HVJ3-12/630 12000 220/110/380 630 5±0.5 2±0.2 >85N 42000 2500 2000  Model Making capacity Breaking capacity Limit opening current(A) Overload Mechanism life Weight(kg) HVJ3-12/160 10Ie,100times 8Ie,25times 10Ie 8Ie,10s 1million times 30 HVJ3-12/250 10Ie,100times 8Ie,25times 10Ie 8Ie,10s 1million times 30 HVJ3-12/400 10Ie,100times 8Ie,25times 10Ie 8Ie,10s 1million times 30 HVJ3-12/630 10Ie,100times 8Ie,25times 10Ie 8Ie,10s 1million times 30 Note: â??Ieâ?? represents the rated current of main circuit
1. General The vacuum contactor is mainly used in the power system with AC 50Hz and rated voltage 7.2kV, for making or breaking circuit and to make electromagnetic starter with suitable protective device and F-C switchgear. 2. Working condition: 1) Altitude should not be over 1,000m; 2) Ambient temperature: -5~40°C; 3) Average temperature in 24 hour not exceed 35°C; 4) When the highest temperature is 40°C, the relative humidity should not be higher than 50%; 5) Pollution degree: class 3 Main models and technical parameters Rated voltage: 7.2 kv Control voltage: 380/220/110 Rated current: 160A Clearance: 3.5±0.3 mm Over travel: 2±0.2 mm Pressure: >85N Main circuit power frequency withstand voltage: 32000 v Auxiliary circuit power frequency withstand voltage: 2500 v Control circuit power frequency withstand voltage: 2000 v Making capacity: 10Ie,100 times Breaking capacity: 8Ie,25 times Limit opening current(A): 10Ie Overload: 8Ie,10 s Mechanism life: 1 million times Weight: 25.5 KG Note: Ie represents the rated current of main circuit
JCZR 7.2kv 12kv Indoor Vacuum Contactor-Fuse Combination Electric Appliance General: This combination electric appliance may install in the switch cabinet to form the F-C loop, use with the integrated protection device. It is used for loading of the switching on and switching off the power pant as well as the industry and mining enterprise, dropout AC high-tension motor, the transformer, capacitor and so on, and it has overload, short circuit protection function. This combination electric appliance may use in AC 50 HZ three-phase power systems. Technical Data: 1. Main Technical Parameter see Table 1. Rated voltage: 7.2 kv / 12 kv Power frequency withstand voltage phase to phase, to earth: 32 kv / 42 kv Power frequency withstand voltage the fracture impact withstand voltage(fracture): 60 kv / 75 kv Fuse rated current A: 25-250 / 25-250 Prospective short circuit breaking current KA: 50 / 50 Prospective short circuit making current(peak value) KA: 130 / 130 Prospective short circuit withstand current( peak value) KA: 10 / 10 Rated short time withstand current( effective value) KA: 4 / 4 Rated short circuit duration S: 4 / 4 Rated making current KA: 4 / 4 Rated breaking current KA: 3.2 / 3.2 Limit breaking current KA: 4.5 / 4.5 Contactor distance between fixed and moving contact mm: 4.5 / 5 Contactor over-travel mm: 1.5 / 1.5 Mechanical life times: Model J:100,000; Model D:300,000 / Model J:100,000; Model D:300,000 Closing coil Rated operation voltage(V): DC220,DC110 Opening coil Rated operation voltage(V): DC220,DC110 Holding coil Rated operation voltage(V): DC220,DC110 Closing coil power: 1200 W Holding coil power: 15 W Opening coil power: 80 W Closing coil Normal work voltage range: 85%-110% rated voltage Holding coil Normal work voltage range: 85%-110% rated voltage Opening coil Normal work voltage range: 60%-120% rated voltage
HVJ3 7.2KV VACUUM CONTACTOR 1. General The vacuum contactor is mainly used in the power system with AC 50Hz and rated voltage 7.2kV, for making or breaking circuit and to make electromagnetic starter with suitable protective device and F-C switchgear. 2. Working condition: 1) Altitude should not be over 1,000m; 2) Ambient temperature: -5~40°C; 3) Average temperature in 24 hour not exceed 35°C; 4) When the highest temperature is 40°C, the relative humidity should not be higher than 50%; 5) Pollution degree: class 3 Main models and technical parameters Rated voltage: 7.2 kv Control voltage: 380/220/110 Rated current: 160A, 250A, 400A, 630A, 800A, 1000A Clearance: 3.5±0.3 mm Over travel: 2±0.2 mm Pressure: >85N Main circuit power frequency withstand voltage: 32000 v Auxiliary circuit power frequency withstand voltage: 2500 v Control circuit power frequency withstand voltage: 2000 v Making capacity: 10Ie,100 times Breaking capacity: 8Ie,25 times Limit opening current(A): 10Ie Overload: 8Ie,10 s Mechanism life: 1 million times Weight: 25.5 KG Note: “Ie” represents the rated current of main circuit
HVJ20 series vacuum contactor has higher rated current, smaller size and anti-dusty advantages. It can be used in AC50 ~ 60Hz, 2KV power system, rated current to 800A, for long distance making-breaking and frequent starting and controlling of AC motor. Rated voltage: 2 kv / 2 kv Rated current: 630A / 800A Main circuit making ability (A/100 times): 6300 / 6300 Main circuit break-make ability (A/10 times): 5000 / 6000 Maximum breaking ability (A/3 times): 6300 / 6300 Electrical life AC3(times): 600,000 / 600,000 Electrical life AC4(times): 100,000 / 100,000 Mechanical life(times): 1,000,000 / 1,000,000 Rated operating frequency AC3(times /h): 300 / 300 Rated operating frequency AC4(times /h): 120 / 120 Short-time operating frequency times /h(20S): 1200 / 1200 Clearance between open contacts(mm): 3±0.3 / 3±0.3 Over travel(mm): =1 / =1
HVJ3 12KV VACUUM CONTACTOR Detailed product description: The vacuum contactor is mainly used in the power system with AC 50Hz and rated voltage 12kV, for making or breaking circuit and to make electromagnetic starter with suitable protective device and F-C switchgear. Working condition: 1) Altitude should not be over 1,000m; 2) Ambient temperature: -5~40°C; 3) Average temperature in 24 hour not exceed 35°C; 4) When the highest temperature is 40°C, the relative humidity should not be higher than 50%; 5) Pollution degree: class 3 .Main models and technical parameters Rated voltage: 12 KV Control voltage: 220/110/380 Rated current: 160A, 250A, 400A, 630A Clearance: 5±0.5 mm Over travel: 2±0.2 mm Pressure: >85N Main circuit power frequency withstand voltage: 42000 v Auxiliary circuit power frequency withstand voltage: 2500 v Control circuit power frequency withstand voltage: 2000 v Making capacity: 10Ie,100 times Breaking capacity: 8Ie,25 times Limit opening current(A): 10Ie Overload: 8Ie,10 s Mechanism life: 1 million times Weight: 30KG Note: â??Ieâ?? represents the rated current of main circuit
1. Introduction JCZ5 7.2 kv vacuum contactor HVJ6-7.2 series indoor high-voltage AC vacuum contactor has two types: One is Mechanical holding type, the other is Electromagnetic holding type. It is applicable for three-phase AC 50HZ power system of rated voltage 7.2KV and below and rated current up to 630 A to open and close circuit remotely and control electrical equipment like high-voltage motor, transformer and capacitive load. It is especially suitable for fields operated frequently. The contactor uses the international fashionable up and down structure arrangement and has the advantages of small, light, easy to maintain and form a complete set of F-C circuit equipment. 2. Service condition a) Ambient air temperature: -25?- +40?. b) Altitude not exceed 2000m c)Humidity: -Relative humidity: daily mean not higher than 95?,monthly mean not higher than 90?; -Aqueous vapor pressure: daily mean not exceed 2.2 KP, monthly mean not exceed 1.8 KP Ambient air should not be obviously polluted by corrosive or flammable gas or vapor; C)Free of frequent severe vibration; When running, angle of inclination between installation surface and horizontal plane should not exceed 5?. Main technical parameters Rated voltage: 7.2 kv Control voltage: 110V, 220V Rated current: 200A, 400A, 630A Contacts separation: 4.5+1-0.5mm Over travel: 1.5±0.5 mm Main circuit power frequency voltage withstand: 32000 V Auxiliary circuit power frequency withstand voltage: 2500 V Control circuit power frequency withstand voltage: 2000 V Making capacity: 10le,100 times Breaking capacity: 8le, 25 times Limit breaking current(A): 10le Mechanical life times: 30×104 Weight: 28KG
1.Introduction JCZ5 7.2 kv vacuum contactor HVJ6-7.2 series indoor high-voltage AC vacuum contactor has two types: One is Mechanical holding type, the other is Electromagnetic holding type. It is applicable for three-phase AC 50HZ power system of rated voltage 7.2KV and below and rated current up to 630 A to open and close circuit remotely and control electrical equipment like high-voltage motor, transformer and capacitive load. It is especially suitable for fields operated frequently. The contactor uses the international fashionable up and down structure arrangement and has the advantages of small, light, easy to maintain and form a complete set of F-C circuit equipment. 2. Service condition a) Ambient air temperature: -25- +40. b) Altitude not exceed 2000m c)Humidity: -Relative humidity: daily mean not higher than 95,monthly mean not higher than 90; -Aqueous vapor pressure: daily mean not exceed 2.2 KP, monthly mean not exceed 1.8 KP Ambient air should not be obviously polluted by corrosive or flammable gas or vapor; C)Free of frequent severe vibration; When running, angle of inclination between installation surface and horizontal plane should not exceed 5. Main technical parameters Rated voltage: 7.2 kv Control voltage: 110V, 220V Rated current: 200A, 400A, 630A Contacts separation: 4.5+1-0.5mm Over travel: 1.5±0.5 mm Main circuit power frequency voltage withstand: 32000 V Auxiliary circuit power frequency withstand voltage: 2500 V Control circuit power frequency withstand voltage: 2000 V Making capacity: 10le,100 times Breaking capacity: 8le, 25 times Limit breaking current(A): 10le Mechanical life times: 30104 Weight: 28KG
1.Introduction JCZ5 12kv vacuum contactor HVJ6-12 series indoor high-voltage AC vacuum contactor has two types: One is Mechanical holding type, the other is Electromagnetic holding type. It is applicable for three-phase AC 50HZ power system of rated voltage 12KV and below and rated current up to 630 A to open and close circuit remotely and control electrical equipment like high-voltage motor, transformer and capacitive load. It is especially suitable for fields operated frequently. The contactor uses the international fashionable up and down structure arrangement and has the advantages of small, light, easy to maintain and form a complete set of circuit equipment. 2. Service condition a) Ambient air temperature: -25- +40. b) Altitude not exceed 2000m c)Humidity: -Relative humidity: daily mean not higher than 95,monthly mean not higher than 90; -Aqueous vapor pressure: daily mean not exceed 2.2 KP, monthly mean not exceed 1.8 KP Ambient air should not be obviously polluted by corrosive or flammable gas or vapor; C)Free of frequent severe vibration; When running, angle of inclination between installation surface and horizontal plane should not exceed 5. Main technical parameters Rated voltage: 12000 v Control circuit: 110V 220V Rated current: 200A 400A 630A Contacts separation: 5+1-0.5 mm Over travel: 1.5±0.5 mm Main circuit power frequency withstand voltage: 42000 v Auxiliary circuit power frequency voltage withstand: 2500 v Control circuit power frequency voltage withstand: 2000 V Making capacity: 10le,100 times Breaking capacity: 8le, 25 times Limit breaking current(A): 10le Mechanical life times: 30104 Weight: 32KG
HVJ3 7.2KV VACUUM CONTACTOR 1. General The vacuum contactor is mainly used in the power system with AC 50Hz and rated voltage 7.2kV, for making or breaking circuit and to make electromagnetic starter with suitable protective device and F-C switchgear. 2. Working condition: 1) Altitude should not be over 1,000m; 2) Ambient temperature: -5~40°C; 3) Average temperature in 24 hour not exceed 35°C; 4) When the highest temperature is 40°C, the relative humidity should not be higher than 50%; 5) Pollution degree: class 3 Main models and technical parameters Rated voltage: 7.2 kv Control voltage: 380/220/110 Rated current: 160A, 250A, 400A, 630A, 800A, 1000A Clearance: 3.5±0.3 mm Over travel: 2±0.2 mm Pressure: >85N Main circuit power frequency withstand voltage: 32000 v Auxiliary circuit power frequency withstand voltage: 2500 v Control circuit power frequency withstand voltage: 2000 v Making capacity: 10Ie,100 times Breaking capacity: 8Ie,25 times Limit opening current(A): 10Ie Overload: 8Ie,10 s Mechanism life: 1 million times Weight: 25.5 KG Note: â??Ieâ?? represents the rated current of main circuit
The vacuum contactor is mainly used in the power system with AC 50Hz and rated voltage 7.2kV, for making or breaking circuit and to make electromagnetic starter with suitable protective device and F-C switchgear.
HVJ20 series vacuum contactor has higher rated current, smaller size and anti-dusty advantages. It can be used in AC50 ~ 60Hz, 2KV power system, rated current to 800A, for long distance making-breaking and frequent starting and controlling of AC motor. Rated voltage: 2 kv / 2 kv Rated current: 630A / 800A Main circuit making ability (A/100 times): 6300 / 6300 Main circuit break-make ability (A/10 times): 5000 / 6000 Maximum breaking ability (A/3 times): 6300 / 6300 Electrical life AC3(times): 600,000 / 600,000 Electrical life AC4(times): 100,000 / 100,000 Mechanical life(times): 1,000,000 / 1,000,000 Rated operating frequency AC3(times /h): 300 / 300 Rated operating frequency AC4(times /h): 120 / 120 Short-time operating frequency times /h(20S): 1200 / 1200 Clearance between open contacts(mm): 3±0.3 / 3±0.3 Over travel(mm): 1 / 1
1. General HVJ5 1.14kv 125A AC vacuum contactor is designed for long-distance making and breaking of circuit, frequent starting and controlling of AC motors in the power systems, with AC 50Hz-60Hz, rated voltage of 1,140V and rated current to 125A. It also can be equipped with thermal relay and all kinds of protection apparatus like electromagnetic starter, especially applied to explosion-proof starter and so on. 2. Main technical parameter Rated voltage: 1140 V Control voltage: 36V, 110V, 220V, 380V Rated current: 125A Opening distance: 1.8±0.2 mm Over travel: 1±0.2 mm Final pressure: 30±3 N Main circuit power frequency voltage withstand: 4200 V Auxiliary circuit power frequency voltage withstand: 2500 V Control circuit power frequency voltage withstand: 2000 V Making capacity: 10Ie,100 times Breaking capacity: 8Ie,25 times Limit breaking current(A): 2000,3 times Electricity life times AC3: 60*104 Electricity life times AC4: 60*104 Mechanical life times: 300*104 Overload capacity: 8Ie 10 S Remark: “Ie” is Rated current of main circuit.
HVJ30 1.14kv vacuum contactor 1000A 1250A HVJ30-1.14/1000?1250 series AC vacuum contactor is applicable for AC 50HZ power system of rated voltage 1.14KV and rated current up to 1000 A~1250Ato open and close circuit, start and control AC motor frequently. It is suitable for composed magnetic starter with various protective devices (JDB electronic integrated protector, JR9 type over current protection device, resistance-capacitance absorbers). It is particularly suitable for compose a explosion-proof magnetic starter and large mineral switchgear. Rated voltage: 1.14 kv Rated current: 1000A 1250A Making capacity(A): 5000(100 times) Breaking capacity(A): 4500(10 times) Limit breaking capacity(A): 5000(3 times) Electrical life times(AC3): 600,000 times Electrical life times(AC4): 6,000 times Mechanical life times: 1,000,000 times Rated operating frequency (AC3): 600 times /h Rated operating frequency (AC4): 120 times /h Short-time operating frequency(20s): 1000 times /h Contacts separation: 2.8±0.1 mm Over travel: 1.0±0.1 mm
1. Introduction JCZ5 12kv vacuum contactor HVJ6-12 series indoor high-voltage AC vacuum contactor has two types: One is Mechanical holding type, the other is Electromagnetic holding type. It is applicable for three-phase AC 50HZ power system of rated voltage 12KV and below and rated current up to 630 A to open and close circuit remotely and control electrical equipment like high-voltage motor, transformer and capacitive load. It is especially suitable for fields operated frequently. The contactor uses the international fashionable up and down structure arrangement and has the advantages of small, light, easy to maintain and form a complete set of circuit equipment. 2. Service condition a) Ambient air temperature: -25- +40. b) Altitude not exceed 2000m c)Humidity: -Relative humidity: daily mean not higher than 95,monthly mean not higher than 90; -Aqueous vapor pressure: daily mean not exceed 2.2 KP, monthly mean not exceed 1.8 KP Ambient air should not be obviously polluted by corrosive or flammable gas or vapor; C)Free of frequent severe vibration; When running, angle of inclination between installation surface and horizontal plane should not exceed 5. Main technical parameters Rated voltage: 12000 v Control circuit: 110V 220V Rated current: 200A 400A 630A Contacts separation: 5+1-0.5 mm Over travel: 1.5±0.5 mm Main circuit power frequency withstand voltage: 42000 v Auxiliary circuit power frequency voltage withstand: 2500 v Control circuit power frequency voltage withstand: 2000 V Making capacity: 10le,100 times Breaking capacity: 8le, 25 times Limit breaking current(A): 10le Mechanical life times: 30104 Weight: 32KG
HVJ3 7.2KV VACUUM CONTACTOR 1. General The vacuum contactor is mainly used in the power system with AC 50Hz and rated voltage 7.2kV, for making or breaking circuit and to make electromagnetic starter with suitable protective device and F-C switchgear. 2. Working condition: 1) Altitude should not be over 1,000m; 2) Ambient temperature: -5~40°C; 3) Average temperature in 24 hour not exceed 35°C; 4) When the highest temperature is 40°C, the relative humidity should not be higher than 50%; 5) Pollution degree: class 3 Main models and technical parameters Rated voltage: 7.2 kv Control voltage: 380/220/110 Rated current: 160A, 250A, 400A, 630A, 800A, 1000A Clearance: 3.5±0.3 mm Over travel: 2±0.2 mm Pressure: >85N Main circuit power frequency withstand voltage: 32000 v Auxiliary circuit power frequency withstand voltage: 2500 v Control circuit power frequency withstand voltage: 2000 v Making capacity: 10Ie,100 times Breaking capacity: 8Ie,25 times Limit opening current(A): 10Ie Overload: 8Ie,10 s Mechanism life: 1 million times Weight: 25.5 KG Note: â??Ieâ?? represents the rated current of main circuit
1. General HVD32 ZW32 12kv 630A This vacuum circuit breaker VCB is three-phase AC 50Hz, rated voltage 12 kV outdoor high voltage switch equipment. It is mainly used to opening(closing) load current, overload current and short-circuit current. It is suitable to protect or control the city or village electrical power distribution system. 2 . Main technical parameter Rated voltage: 12 kv 1 minute rated power frequency withstand voltage: Phase to Phase, to Ground 42 kv / Fracture 48 kv Rated current: 630A Rated short circuit breaking current: 12.5KA, 16KA, 20KA Rated short-circuit current (peak): 31.5KA, 40KA, 50KA Rated peak withstand current: 31.5KA, 40KA, 50KA 4s rated short time withstand current: 12.5KA, 16KA, 20KA Rated operating sequence: O-0.3s-CO-180s-CO(Electric operation) Closing time: 30-60 ms Opening time: 20-40 ms Rated short circuit breaking current breaking times: 30 times Mechanical life: 10,000 times Secondary circuit 1 minute power frequency withstand voltage: 2000 v Energy storage motor rated power: 40 w Energy storage motor rated voltage V: DC220/110 Rated closing operation voltage v: DC220/110, AC220/110 Rated switching operation voltage v: DC220/110, AC220/110 Electric energy storage time: 8 s
