HFSR is ALWAYS a tailor made product; hence, it is always built as per customers various requirements.
Typically the LT (415/690 VAC) motors are not available with neutral terminal box, where as all the Ht (3.3/6.6/11KV) motors are generally available with neutral terminal.
The beauty of HFSR is it can be connected to the neutral terminal of the motor and it is best for retrofitting. There are basic two types.
1. NRSS: - Neutral Reactor Soft Starter.
2. LRSS: - Line Reactor Soft Starter.