R Core Physical Dimensions of Transformer With 25-35VA Rated Power

Key Advantages

1. Compact Size and Lightweight: The R-type transformer utilizes an uncut, wound core with a uniform circular cross-section. Compared to traditional E-I or C-core transformers, it can be approximately 30% smaller in volume and 40% lighter in weight. This compact design makes it easy to integrate into devices with space constraints.

2. High Efficiency and Low Loss: Due to its seamless core made from high-permeability silicon steel, iron losses are significantly reduced. Furthermore, the close proximity between the windings and the core shortens the energy transfer distance, achieving efficiencies of over 90%. Additionally, the average turn length of the copper wire is shorter, which further reduces resistive losses and temperature rise.

3. Low Leakage Inductance and Strong EMI Suppression: The core's gapless structure and balanced winding result in extremely low magnetic flux leakage. It effectively minimizes electromagnetic interference (EMI) on nearby electronic components without requiring additional shielding. This feature is particularly important in applications like medical equipment and precision instruments where signal purity is critical.

4. Low Noise and Low Temperature Rise: The uncut core absorbs magnetostrictive stress, and combined with low-loss materials, ensures very quiet operation. At the same time, minimal resistive losses generate less heat, leading to excellent temperature control and suitability for continuous long-term operation.

5. Safety and Flame Retardancy: The primary and secondary windings are manufactured separately using PBT bobbins, providing superior insulation that complies with multiple international safety standards. The use of flame-retardant materials further enhances the device's fire resistance.

6. Small Excitation Current: A well-designed R-type transformer has a significantly reduced excitation current, which lowers no-load power consumption. This makes it ideal for scenarios requiring long periods of energization but with fluctuating loads.

Typical Applications

• Home Appliances: Used in power modules for air conditioners, refrigerators, washing machines, and other appliances to provide stable voltage conversion and low-noise operation.
• Lighting Systems: Acts as a step-down transformer for low-voltage lighting (e.g., landscape lighting, display cabinets), ensuring safe and efficient power supply.
• Small Mechanical Equipment: Provides isolated power for control circuits in machine tools and automation systems, guaranteeing operational safety and stability.

Physical Dimensions of Transformer
Model Number	A	W	X	E	F	G	B	C	T	t	Capacity AV	Weight kg
R-8	67	58	33	53	44	4	43	38	15	0.5	5-10	0.3
R-10	75	61	37	68.4	48	4	46	43	16	0.5	8-15	0.4
R-20	82	70	39	55	45	4	52.5	43	18	1.0	20-28	0.5
R-25	83	72	41	70	55	4	53	43	18	1.0	25-35	0.6
R-30	97	77	43	70	60	5	56	54.5	19.5	1.0	30-45	0.7
R-35	100	80	45	70	60	5	60	53.5	21.5	1.0	35-50	0.9
R-40	99	80	48	70	60	5	58	53.5	20	1.0	40-55	0.9
R-50	102	90	48	75	65	5	63.5	52.5	21.5	1.0	50-65	1.0
R-80	125	90	52	90	70	5	66.5	73.5	23	1.0	70-100	1.4
R-100	126	103	55	100	80	5	74.5	70.5	28.5	1.2	90-130	1.7
R-160	140	115	63	100	85	5	80	80.5	30	1.6	150-200	2.6
R-260	155	119	66	130	95	5	86	91	32	1.6	200-300	3.1
R-320	163	128	70	135	95	5	95	95.5	36.5	1.6	280-380	3.8
R-600	185	145	85	142	100	8	106	102.5	37	1.6	380-650	6.5
R-800	190	157	88	145	115	6	123	102.5	38	2.0	650-850	6.5
R-1000	227	172	99	180	140	8	135	127	43	2.6	850-1200	10.5
R-1500	238	180	102	175	145	8	147	135	44	2.6	1300-1800	13.0
R-2000	240	200	105	185	160	8	161	135	48	3.0	1800-2500	16.5
R-3000	260	226	125	200	180	8	180	138	56	3.0	2500-3500	23.5
R-5000	390	300	180	300	240	8	203	174	61	3.0	4000-5500	42
Rated Power		R5/4-6W		R10/10-15W		R20/20-25W		R30/30-40W		W40/40-50W		W50/50-68W
Input Voltage		220V/380V
Output Voltage	7.5V	0.66A		2A		3.3A		5.3A		6.5A		8A
	9V	0.55A		1.6A		2.7A		4.4A		5.5A		6.6A
	12V	0.4A		1.2A		2A		3.3A		4.1A		5A
	15V	0.33A		1A		1.6A		2.6A		3.3A		4A
	24V	0.21A		0.6A		1A		1.6A		2A		2.5A
	9V-0-9V	0.27A		0.8A		1.3A		2A		2.7A		3.3A
	12V-0-12V	0.21A		0.6A		1A		1.6A		2A		2.5A
	24V-0-24V	0.1A		0.3A		0.5A		0.8A		1A		1.25A
Diameter * Height mm		58*47*26		75*61*37		82*70*39		97*77*43		99*80*48		102*92*48
Hole center spacing mm		45*33		68*48		55*45		70*60		70*60		75*65
Weight kg		0.25		0.4		0.5		0.7		0.9		1
Note: All dimensions are manually measured; actual product may vary.

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R Core Physical Dimensions of Transformer With 25-35VA Rated Power Images