This kind of low frequency transformers is made of high magnetic flow and low-loss high quality silicon sheet. It features little no-load loss, high output power, high efficiency, low temperature and low noise. It is used widely in VCD, Hi-fi audios and low voltage lighting.

Some Parameters of Annular Transformer
Output power	External Dimension(mm)			Insulation Level
	OD	ID	HT
30VA	81	28	32	B
50VA	85	30	38	B
80VA	100	32	40	B
100VA-150VA	110	34	52	B
150VA-250VA	120	36	53	B
200VA-300VA	127	40	59	B
300VA-400VA	130	45	62	B
400VA-500VA	138	18	63	B
500VA-650VA	146	50	68	B
650VA-750VA	155	52	82	B
750VA-1000VA	175	56	82	B
1000VA-1500VA	195	60	90	B
1500VA-2000VA	210	65	95	B