Description

Nano-crystalline cores for voltage independent RCCBs

A Residual Current Circuit Breaker (RCCB) is an important safety measure when it comes to protection of electrical circuits. It is a current sensing device, which can automatically measure and disconnect the circuit whenever a fault occurs in the connected circuit or the current exceeds the rated sensitivity.

RCCB Core are used in electrical installation engineering, RCCB Core is called residual current circuit break core, Core shape is toroid with plastic case protection.

It is mainly to protect circuit safety in both residential and industrial use, it has many types such as

  • Electronic type
  • Electromagnetic type
  • A type
  • AC type
  • 2 Pole RCCB
  • 4 Pole RCCB

Rating from 10 Amp ….100 Amp

Sensitivity 30,100,300 m Amp

RCCB image RCCB Drawing

Some of the standards current ratings and material permeability as below:

Sr. No. Leakage current ratings Initial Permeability(k) Max. Permeability(k)
1 10-30mA 100 - 180 350 - 500
2 100mA 80 - 150 190 - 350
3 300mA 70 - 110 100 - 160
4 500mA 50 - 70 80 - 100

The raw material used for RCCB Core is nanocrystalline ribbon. General material characteristic as below:

BASIC PARAMETER NANO CORE
Saturation Flux Density (T) 1.25
Initial Permeability 50,000 – 180,000
Maximum Permeability 80,000 - 500,000
Density (g/cm2) 7.25
Curie Temperature 570
Ribbon Thickness (mm) 0.025-0.030
Occupation Stack factor 0.8

Hysteresis Magnetizing Loop :

RCCB Drawing

Advantage of Nanocrystalline over other common material:

  • High permeability - increase inductance and reducing winding turns
  • High saturation induction – minimizing size of component
  • High curie temperature
  • Low coercivity
  • Low core loss
  • Excellent thermal stability

Application area for RCCB Core:

  • Electronic RCCB
  • Electromagnetic RCCB
Bare Core Size Finish Casing Size
ID x OD x Ht ID x OD x Ht
13 x 17.8 x 5 mm 11.60 x 19.60 x 6.55 mm
14 x 20 x 10 mm 12.10 x 22.60 x 11.75 mm
16 x 26 x 10 mm 14.10 x 28.30 x 12.70 mm
20 x 30 x 15 mm 17.80 x 33.50 x 17.85 mm
10 x 15 x 20 mm 8.25 x 18.20 x 22.35 mm
13 x 21.5 x 18 mm 11.55 x 24.65 x 21.30 mm
13.8 x 20 x 12 mm 11.65 x 24.15 x 15.40 mm
17 x 24.5 x 20 mm 15.70 x 28.20 x 22 mm
11.5 x 18 x 20 mm 9.70 x 23.50 x 22.50 mm
12 x 24 x 25 mm 9.80 x 26.70 x 27.80 mm
9 x 15 x 20 mm 7 x 17.50 x 24 mm
12 x 23.5 x 22 mm 10 x 25.5 x 24.3 mm
8.8 x 11.7 x 20 mm 6.9 x 13.8 x 22.3 mm