If you consult Microsoft's support page (under "AC power cords") about this.
You'll notice that you need a PSU that is compatible with a 230V230v @ 50Hz PSUoutlet for the Netherlands, which should be compatible with your NTSC Slim console (which useswhose PSU is made for a 120V120v @ 60Hz PSUoutlet) because the DC output is the same (look at your PSU).
NTSC: AC input: 100-127v-3.7A, 47.63 MHz, DC output: 135 watts
PAL: AC input: 200-240v-2A, 47.63 MHz, DC output: 135 watts
It's recommend contacting Xbox 360 support and asking for a "replacement," checking your local game/electronics store, or even Ebay.