3AH4 Vacuum Circuit-Breakers
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3AH4 Vacuum Circuit-Breakers Medium-Voltage Equipment

3AH4 Vacuum Circuit-Breakers · Siemens HG 11.04 · 2018

3AH4 Vacuum Circuit-Breakers Medium-Voltage Equipment Catalog HG 11.04 · 2018 Invalid: Catalog HG 11.04 · August 2010 Contents Page Maintenance, ambient conditions, current carrying capacity and dielectric strength Construction and mode of operation Product range overview and basic equipment Equipment Selection Order number structure and configuration example Selection of secondary equipment Selection of additional equipment Accessories and spare parts Selection of basic types, circuit-breakers Technical Data Electrical data, dimensions, weights and dimension drawings Circuit diagrams...

3AH4 Vacuum Circuit-Breakers · Siemens HG 11.04 · 2018

Description Contents Contents Page Pole assemblies Operating mechanism Trip-free mechanism Circuit-breaker tripping signal Industrial application: Refinery Switching medium Maintenance, ambient conditions, current carrying capacity and dielectric strength Construction and mode of operation Product range overview and basic equipment 3AH4 Vacuum Circuit-Breakers · Siemens HG 11

Description General 3AH4 frequent-operation circuit-breaker from 12 to 40.5 kV – The Persistent Certain applications, especially in the industry, need high and up to very high numbers of operating cycles. For example, operation of arc furnaces requires more than 100 operating cycles a day. 3AH4 – the circuit-breaker for a maximum number of operating cycles The vacuum circuit-breaker type 3AH4 up to 40.5 kV is designed for extremely high numbers of operating cycles: Depending on the design, it controls 30,000, 60,000 or even 120,000 operating cycles. Minimum maintenance work, such as...

Description Construction and mode of operation The vacuum circuit-breaker consists of the pole assemblies (1) and the operating mechanism box (2). The pole assemblies are fixed to the operating mechanism box via post insulators (3). The switching movement is transferred by means of operating rods (4) and levers. Switching medium The vacuum switching technology, proven and fully developed for more than 40 years, serves as arc-quenching principle by using vacuum interrupters. Pole assemblies The pole assemblies consist of the vacuum interrupters (6) and the interrupter supports. The vacuum...

Description Construction and mode of operation, standards Releases A release is a device which transfers electrical commands from an external source, such as a control room, to the latching mechanism of the vacuum circuit-breaker so that it can be opened or closed. Apart from the closing solenoid, the maximum possible equipment is one shunt release and two other releases. For release combinations, refer to page 15. • The closing solenoid unlatches the charged closing spring of the vacuum circuit-breaker, closing it by electrical means. It is suitable for DC or AC voltage. • Shunt releases...

Description Maintenance, ambient conditions, current carrying capacity and dielectric strength Maintenance The 3AH4 vacuum circuit-breakers are maintenance-free up to 10,000 operating cycles under normal ambient conditions according to IEC 62271-1. After that, maintenance is to be effected according to the maintenance schedule, e.g. relubrication every 10,000 operating cycles, and replacement of the vacuum interrupters every 30,000 operating cycles. Ambient conditions The vacuum circuit-breakers are designed for the normal operating conditions defined in IEC 62271-100. Current carrying...

Description Product range overview and basic equipment Rated voltage ■ Available design 120,000 operating cycles □ Available design 30,000/60,000 operating cycles 3AH4 Vacuum Circuit-Breakers ■ Siemens HG 11.04 ■ 2018

Contents Page Order number structure and configuration example 12 Selection of basic types, circuit-breakers Voltage level 12 kV Voltage level 17.5 kV Voltage level 24 kV Voltage level 36 kV Voltage level 40.5 kV Selection of secondary equipment Release combination Operating voltage of the closing solenoid 17 Operating voltage of the 1st shunt release 18 Operating voltage of the 2nd release 19 Operating voltage of the 3rd release 20 Operating voltage of the operating mechanism 21 Auxiliary switch, low-voltage interface interlocking 22 Selection of additional equipment 24 Accessories and...

Equipment Selection Order number structure and configuration example Order number structure Special versions («) The 3AH4 vacuum circuit-breakers consist of a primary and a secondary part. The relevant data make up the 16-digit order number. The primary part covers the main electrical data of the circuit-breaker poles. The secondary part covers the auxiliary devices which are necessary for operating and controlling the vacuum circuit-breaker. In case of special versions, “-Z” is added to the order number and a descriptive order code follows. If several special versions are required, the...

Equipment Selection Selection of basic types, circuit-breakers 1) Higher Ud on request 17.5 kV 50/60 Hz, 30,000/60,000 operating cycles Only together with Only together with Only together with Only together with Only together with Only together with 2) Obligatory with selection of the number of operating cycles via order code: 30,000 operating cycles 60,000 operating cycles Only together with Only together with Only together with Only together with Only together with Only together with Configuration example 3AH4 vacuum circuit-breaker 3 A H 4 Rated voltage Ur = 17.5 kV, 50/60 Hz Rated...

50/60 Hz, 30,000/60,0000/120,000 operating cycles Order No.: Order codes 2000 1) Obligatory with selection of the number of operating cycles via short code: 30,000 operating cycles 60,000 operating cycles Only together with Only together with Only together with Only together with 120,000 operating cycles 120,000 operating cycles Only together with Only together with Special versions Configuration example 3AH4 vacuum circuit-breaker Rated voltage Ur= 36 kV, 50/60 Hz Rated lightning impulse withstand voltage Up= 170 kV Rated short-circuit breaking current ISC= 40 kA Pole-centre distance = 350...