Application notes
PS3011-2440-0000
34
Version: 1.0
4.3
External input protection
The device is tested and approved for circuits up to 30 A (UL) and 32 A (IEC). External protection is only
required if the supply line has a protection that is higher than this. Also check the local regulations and
requirements. Local regulations may apply in some countries.
If an external fuse is required or used, minimum requirements must be taken into account to avoid false
tripping of the circuit breaker.
• A circuit breaker with a minimum value of 16 A with B or C characteristic should be used if the device is
used with AC 100 V or AC 120 V mains voltage (including AC 230 V).
• If the device is only used with AC 230 V mains voltage, a 10 A circuit breaker with B or C characteristic
is sufficient.
4.4
Operation on two phases
The power supply can also be used on two phases of a three-phase system. Such a phase-to-phase
connection is permissible as long as the supply voltage is below 240 V+10%.
Fig. 22: Operation on two phases
Use a fuse or circuit breaker to protect the N input. The N input is not protected internally and is connected to
the live conductor in this case. Suitable fuses or circuit breakers are specified in section
.
