The DC superimposition section also has a decoupling circuit, so the primary side is protected,

but even at maximum test voltage of 15kV normal mode application, approximately 200V line-to-ground voltage is applied to the primary side.

For 24V DC power supplies, approximately 10 times the voltage is applied to the output port, so please take countermeasures such as installing SPD or surge protection elements according to the DC power supply specifications.