No clue about electrical requirements in Singapore but check this out. Surge protection, regulation, isolation and breakers included.
http://cgi.ebay.com/Topaz-7-5-kVA-Power-Conditioner-Isolation-Transformer_W0QQitemZ330314111193QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item330314111193&_trksid=p3286.c0.m14&_trkparms=66%3A2%7C65%3A10%7C39%3A1%7C240%3A1318
http://cgi.ebay.com/Topaz-7-5-kVA-Power-Conditioner-Isolation-Transformer_W0QQitemZ330314111193QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item330314111193&_trksid=p3286.c0.m14&_trkparms=66%3A2%7C65%3A10%7C39%3A1%7C240%3A1318