Sellocan
Üye
- Katılım
- 5 Eyl 2007
- Mesajlar
- 43
- Puanları
- 1
Pano tasarımı yapılırken seçilecek otomatik sigortaların karakteristliklerine göre seçilmesi önemlidir. Bunun için aşağıdaki bilgiden istifade edebilirsiniz.
Based on the Tripping Characteristics, MCBs are available in B, C, D, 'Z', 'K' and 'S' curve to suit different types of applications.
B Curve: for protection of electrical circuits with equipment that does not cause surge current (lighting and distribution circuits).
Short circuit release is set to (3-5) In
C Curve: for protection of electrical circuits with equipment that causes surge current (inductive loads and motor circuits).
Short circuit release is set to (5 - 10) In
D Curve: for protection of electrical circuits which causes high inrush current, typically 12-15 times the thermal rated current (transformers, X-ray machines etc.).
Short circuit release is set to (10 - 20) In
K Curve:
Suitable for applications where high levels of inrush current are expected.
Instantaneous trip is (8 - 12) In. The high magnetic trip point is ideal for motors and transformers. The narrow range (compared with the type D curve) makes it ideal for applications where nuisance tripping is not an issue.
Z Curve:
Suitable for applications where semiconductors and other components that fail open are used. Instantaneous trip is (2 - 3) In. The short thermal delay and low magnetic trip point are ideal for applications where devices and components have low surge and short circuit tolerances.
S Curve:
Suitable for applications with highly inductive loads, especially in control circuits with coils and light filaments. Instantaneous response between (13 - 17) In.
Note:
Based on the Tripping Characteristics, MCBs are available in B, C, D, 'Z', 'K' and 'S' curve to suit different types of applications.
B Curve: for protection of electrical circuits with equipment that does not cause surge current (lighting and distribution circuits).
Short circuit release is set to (3-5) In
C Curve: for protection of electrical circuits with equipment that causes surge current (inductive loads and motor circuits).
Short circuit release is set to (5 - 10) In
D Curve: for protection of electrical circuits which causes high inrush current, typically 12-15 times the thermal rated current (transformers, X-ray machines etc.).
Short circuit release is set to (10 - 20) In
K Curve:
Suitable for applications where high levels of inrush current are expected.
Instantaneous trip is (8 - 12) In. The high magnetic trip point is ideal for motors and transformers. The narrow range (compared with the type D curve) makes it ideal for applications where nuisance tripping is not an issue.
Z Curve:
Suitable for applications where semiconductors and other components that fail open are used. Instantaneous trip is (2 - 3) In. The short thermal delay and low magnetic trip point are ideal for applications where devices and components have low surge and short circuit tolerances.
S Curve:
Suitable for applications with highly inductive loads, especially in control circuits with coils and light filaments. Instantaneous response between (13 - 17) In.
Note:
- If you use the B MCB in place of D curve MCB, chances are the B curve MCB contacts can weld together, or there will be nuisance trippings. On the other hand, if you use a D curve where a B curve MCB has to be used, the system will damage before the breaker can trip.
