35. NTC Selection & Design

Question.6

The following circuit shows a relay bypass across the NTC inrush current limiter in a 230VAC SMPS.
The relay closes after startup, shorting across the NTC during normal operation. On power-off, the relay opens.

Which problems does this relay bypass solve?

(Select all that apply)

Removes steady-state power dissipation in the NTC
Protects against rapid ON/OFF power cycling
Increases inrush current limiting at power-on
Improves surge voltage clamping on AC mains
Allows the NTC to handle higher steady-state current

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