1 / 11

MCB Tripping – Characteristics

MCB Tripping – Characteristics. MCB´s Knowhow. ABB STOTZ KONTAKT. I. 1. Basics:. General Time / current relation 1. Thermal tripping 2. Electromagnetic tripping. - Thermal non-tripping current rsp. Low test current. - Thermal tripping current rsp. High test current.

king
Download Presentation

MCB Tripping – Characteristics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. MCB Tripping – Characteristics MCB´s Knowhow ABB STOTZ KONTAKT

  2. I 1 Basics: General Time / current relation 1. Thermal tripping 2. Electromagnetic tripping - Thermal non-tripping current rsp. Low test current - Thermal tripping current rsp. High test current - Electromagnetic non-tripping current rsp. test current: hold surges of I3 - Electromagnetic tripping current rsp. test current: trip at least at I4 120 I 60 I 40 1 40 2 20 10 6 4 minutes 2 1 40 20 10 6 seconds 4 2 1 0,6 0,4 0,2 0,1 Tripping time I I 0,06 0,04 4 3 0,02 0,01 1 1,5 2 3 4 5 6 8 10 15 20 30

  3. 120 60 Basics: 40 20 10 Magnetic tripping: AC, 100 Hz = factor 1.1 AC, 200 Hz = factor 1.2 AC, 400 Hz = factor 1.5 DC = factor 1.5 Thermal tripping is not dependent on frequency 6 4 minutes 2 1 40 20 10 seconds 6 4 2 1 0,6 0,4 0,2 AC 0,1 Tripping time 0,06 0,04 DC 0,02 0,01 1 1,5 2 3 4 5 6 8 10 15 20 30 Multiple of rated current DC-current increases the magnetic tripping values by factor 1,5

  4. 120 60 40 20 10 6 4 minutes 2 1 Thermal non tripping: 1,13 x In Thermal tripping: 1,45 x In Magnetic non tripping: 3 x In Magnetic tripping: 5 x In 40 20 10 seconds 6 4 2 1 0,6 B 0,4 0,2 0,1 Tripping time 0,06 0,04 0,02 0,01 1 1,5 2 3 4 5 6 8 10 15 20 30 Multiple of rated current "B"-characteristic acc. EN 60898 rsp. IEC 898: standard for miniature circuit breakers to be used in residential or similar applications • Applications: • low duty applications without starting or inrush currents

  5. 120 60 40 20 10 6 4 minutes 2 1 Thermal non tripping: 1,13 x In Thermal tripping: 1,45 x In Magnetic non tripping: 5 x In Magnetic tripping: 10 x In 40 20 10 seconds 6 4 2 1 0,6 C 0,4 0,2 0,1 Tripping time 0,06 0,04 0,02 0,01 1 1,5 2 3 4 5 6 8 10 15 20 30 Multiple of rated current “C"-characteristic acc. EN 60898 rsp. IEC 898: standard for miniature circuit breakers to be used in residential or similar applications • Applications: • low duty applications with medium starting or inrush currents and low loop impendance

  6. 120 60 40 20 10 6 4 minutes 2 1 Thermal non tripping: 1,13 x In Thermal tripping: 1,45 x In Magnetic non tripping: 10 x In Magnetic tripping: 20 x In 40 20 10 6 seconds 4 2 1 0,6 D 0,4 0,2 0,1 Tripping time 0,06 0,04 0,02 0,01 1 1,5 2 3 4 5 6 8 10 15 20 30 Multiple of rated current “D"-characteristic acc. EN 60898 rsp. IEC 898: standard for miniature circuit breakers to be used in residential or similar applications • Applications: • high duty applications with very high starting or inrush currents but low loop impendance

  7. 120 60 40 20 10 6 4 minutes 2 1 40 • For low duty installations • Rough leveled features for average applications • Restricted thermal protection, allowing : 1,45 x In • Extreme high of „D“ characteristic may lead to delayed tripping time, damaging conductors and equipment • Using „D“, low loop impedances, meaning larger cross sections of conductors is a „must“. 20 10 seconds 6 4 2 1 0,6 C D B 0,4 0,2 0,1 Tripping time 0,06 0,04 0,02 0,01 1 1,5 2 3 4 5 6 8 10 15 20 30 Multiple of rated current "B,C;D"-characteristics acc. EN 60898 rsp. IEC 898: Standard for miniature circuit breakers to be used in residential or similar applications.

  8. 120 60 40 20 10 6 4 minutes 2 1 40 20 10 seconds 6 4 2 K 1 Z 0,6 C D B 0,4 0,2 0,1 Tripping time 0,06 0,04 0,02 0,01 1 1,5 2 3 4 5 6 8 10 15 20 30 Multiple of rated current “STOTZ“ „Z“„K“characteristics acc. EN 60947-2 rsp. IEC 947-2:standard for industrial switchgear „The tailormade solution for commercial and industrial applications“ Compared to tripping characteristics „B“,“C“, „D“ the STOTZ characteristics „K“ and „Z“offer a higher degree of protection. This means a higher degree of safety in both, planning and operation

  9. 120 60 40 20 10 6 4 minutes Thermal non tripping: 1,05 x In Thermal tripping: 1,2 x In Magnetic non tripping: 2 x In Magnetic tripping: 3 x In 2 1 40 20 10 seconds 6 4 2 Z 1 0,6 C D B 0,4 0,2 0,1 Tripping time 0,06 0,04 0,02 0,01 1 1,5 2 3 4 5 6 8 10 15 20 30 Multiple of rated current “Z"-characteristic acc. EN 60947-2 rsp. IEC 947-2:standard for industrial switchgear • A sensitive characteristic to protect highly sensitive equipment such as: • 0,14mm2 cable sets • applications with limit switches • reed contacts in burglar alarm systems • sensor technology • actuators in bus systems • printed boards with its semiconductors

  10. 120 “K"-characteristic acc. EN 60947-2 rsp. IEC 947-2:standard for industrial switchgear 60 40 20 10 Thermal non tripping: 1,05 x In Thermal tripping: 1,2 x In Magnetic non tripping S270: 8 x In Magnetic tripping S270: 12 x In Magnetic non tripping S280: 10 x In Magnetic tripping S280: 14 x In 6 4 minutes 2 1 40 20 10 6 seconds 4 2 • The right choice for high duty application • with high starting or inrush currents: • Motors, fan sets • Power supply units: i.e 24V DC supply for intelligent building automation systems • Charging sets; i.e for electrical forklift trucks • Extra low voltage lamps, high performance tools, electronic ballasts • Welding- and control power transformer 1 K 0,6 C D B 0,4 0,2 0,1 Tripping time 0,06 0,04 0,02 0,01 1 1,5 2 3 4 5 6 8 10 15 20 30 Multiple of rated current

More Related