1, because &switch contacts between oxidation film, if use smaller current detection, because the oxide films on test results general slants big many, but oxidation film in the big electricity flow is can be breakdown of, theoretically, test current as long as no more than rated current, should be the bigger the better, but in formulating rules when considering the relevant domestic instrument at that time, make the production level of less than 100A current regulation might.
2, due to the circuit breaker contact resistance is very small, only with a high current detection, ability assures certain precision anti-interference ability is stronger also.

TE100 type of maximum output current is TE200 type for 200A 100A, TE600 type, for 600A. Compared with similar products in the current source, difference is very big still:
1, large current and deft and perfect union, for example: TE200 type in guarantee 200A output current at the same time, the weight only 5.5 kg or so, and other companies to achieve similar products 100A type 15kg.
2, can long time continuous output large current, and some similar products only can instantly output large current, namely "pulsing" power, at breakdown &switch contacts oxidation film, the difference on the ability is huge.
3, nc constant-current source type, output current output by software options, no mechanical adjusting devices, stable and reliable.