Technical FAQs

Ask a Question

What is the maximum earth loop impedance values (Zs) for the GV4 range?

The charts below detail the Earth Loop impedance (Zs) for the GV4 range for any TN system based on the British Standard BS7671:2008+A3:2015

Two documents are also attached:
1) Sheet with Zs charts of Tesys motor circuit breakers:
  • Tesys GV2
  • Tesys GV3
  • Tesys GV4
  • Tesys GV7
  • Tesys U
2) Explaination of the calculation of the maximum Earth Loop Impedancee
This also includes additional information about:
  • Motor Rated devices
  • Ambient Temperature
Tesys GV4 Range
Please refer to the charts below that detail the maximum earth loop impedance Zs for 0.4s disconnection time with Uo 230V
GV4L
Reference Thermal Adjustment
Range In
Magnetic Tripping Current Im Tolerance
Im+20%
Maximum Loop
Impedance Zs
  (A) (A) (A) (Ω) 
GV4LE02N 2 12 .. 28 33.60 6.50
GV4LE02S
GV4L02N
GV4LE03N 3.5 21 .. 49 58.80 3.72
GV4LE03S
GV4L03N
GV4LE07N 7 42 .. 98 117.60 1.86
GV4L07N
GV4LE07S
GV4LE12N 12.5 75 .. 175 210.00 1.04
GV4LE12S
GV4L12N
GV4LE25B 25 150 .. 350 420.0 0.52
GV4L25B
GV4LE25N
GV4LE25S
GV4L25N
GV4LE50B 50 300 .. 700 840 0.26
GV4LE50N
GV4LE50S
GV4L50B
GV4L50N
GV4LE80B 80 480 .. 1120 1344 0.16
GV4LE80N
GV4LE80S
GV4L80B
GV4L80N
GV4L80S
GV4LE115B 115 690 .. 1610 1932 0.11
GV4LE115N
GV4LE115S
GV4L115B
GV4L115N
GV4L115S
 
GV4P
Reference Thermal Adjustment
Range In
Magnetic Tripping Current Im Tolerance
Im+20%
Maximum Loop
Impedance Zs
  (A) (A) (A) (Ω) 
GV4PE02N 0.8 .. 2 34 40.80 5.36
GV4PE02S
GV4P02N
GV4PEM02N
GV4PEM02S
GV4PE03N 1.4 .. 3.5 60 72.00 3.03
GV4PE03S
GV4P03N
GV4PEM03N
GV4PEM03S
GV4PE07N 2.9 .. 7 119 142.80 1.53
GV4PE07S
GV4P07N
GV4PEM07N
GV4PEM07S
GV4PE12N 5 .. 12.5 213 255.6 0.85
GV4PE12S
GV4P12N
GV4PEM12N
GV4PEM12S
GV4PE25B 10 .. 25 425 510 0.43
GV4PE25N
GV4PE25S
GV4P25B
GV4P25N
GV4PEM25B
GV4PEM25N
GV4PEM25S
GV4PE50B 20 .. 50 850 1020 0.21
GV4PE50N
GV4PE50S
GV4P50B
GV4P50N
GV4PEM50B
GV4PEM50N
GV4PEM50S
GV4PE80B 40 .. 80 1360 1632 0.13
GV4PE80N
GV4PE80S
GV4P80B
GV4P80N
GV4P80S
GV4PEM80B
GV4PEM80N
GV4PEM80S
GV4PE115B 65 .. 115 1955 2346 0.09
GV4PE115N
GV4PE115S
GV4P115B
GV4P115N
GV4P115S
GV4PEM115B
GV4PEM115N
Was this helpful?
What can we do to improve the information ?