Power Transformers - Board Mount

.hide-partial { max-height: none; } .show-more { display: none; }

ST Class 2 Transformers

Signal Transformer / Bel ST Class 2 Transformers provide superior isolation and low capacitive coupling. These split-bobbin, low-power transformers feature a power rating of 1.1VA to 36VA and are available in 60 standard configurations. Signal Transformer / Bel ST Class 2 Transformers are recognized to UL 506 and meet the specifications for UL 1446 (E66312).

.catnav-wrapper { height: auto; overflow: visible; } .catalog-nav-tabs ul { white-space: normal; }

Results: 60

Applied Filters:

Secondary Voltage Rating

Power Rating

Secondary Current Rating

Length

Width

Height

Reset All

Search within results

In Stock

Normally Stocked

Active

New Products

RoHS Compliant

.search-refine-wrapper { display: inline-block; min-width: 100%; } .scroll-body { overflow-x: visible; } .search-table-wrapper { overflow: visible; } .hide-partial { max-height: none; } .show-more { display: none; }

Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (DKK) Filter the results in the table by unit price based on your quantity.	Qty.	Product	Primary Voltage Rating	Secondary Voltage Rating	Power Rating	Secondary Current Rating	Mounting Style	Primary Winding	Secondary Winding	Length	Width	Height	Series
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 ST-4-36 Bel Signal Transformer 1: 89,82 kr. 10In Stock 100Expected 09/12/2026	Mfr. Part No. ST-4-36 Mouser Part No 530-ST-4-36	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	10In Stock 100Expected 09/12/2026	89,82 kr. 82,28 kr. 77,96 kr. 77,88 kr. View 76,39 kr. 63,04 kr. 59,68 kr. 58,86 kr.	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	36 V CT/18 V	6 VA	170 mA/340 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	41.3 mm	33.3 mm	33.3 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 ST-5-16 Bel Signal Transformer 1: 101,68 kr. 122In Stock	Mfr. Part No. ST-5-16 Mouser Part No 530-ST-5-16	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	122In Stock	101,68 kr. 83,10 kr. 80,79 kr. 78,70 kr. View 68,33 kr. 64,60 kr. 63,48 kr. Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	16 V CT/8 V	12 VA	800 mA/1.6 A	Through Hole	Single Primary Winding	Dual Secondary Winding	48.4 mm	40.4 mm	36.9 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 ST-5-20 Bel Signal Transformer 1: 100,56 kr. 43In Stock	Mfr. Part No. ST-5-20 Mouser Part No 530-ST-5-20	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	43In Stock	100,56 kr. 91,91 kr. 86,31 kr. 83,18 kr. View 80,20 kr. 71,32 kr. 69,30 kr. 68,71 kr. Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	20 V CT/10 V	12 VA	600 mA/1.2 A	Through Hole	Single Primary Winding	Dual Secondary Winding	48.4 mm	40.4 mm	36.9 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 ST-5-48 Bel Signal Transformer 1: 156,96 kr. 26In Stock	Mfr. Part No. ST-5-48 Mouser Part No 530-ST-5-48	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	26In Stock	156,96 kr. 145,47 kr. 123,61 kr. 118,46 kr. View 117,64 kr. 115,11 kr. 113,62 kr. Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	48 V CT/24 V	12 VA	250 mA/500 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	48.4 mm	40.4 mm	36.9 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-6 ST-6-24 Bel Signal Transformer 1: 156,88 kr. 5In Stock	Mfr. Part No. ST-6-24 Mouser Part No 530-ST-6-24	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-6 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	5In Stock	156,88 kr. 134,43 kr. 128,83 kr. 112,94 kr. View 110,33 kr. 105,86 kr. 102,87 kr. Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	24 V CT/12 V	20 VA	800 mA/1.6 A	Through Hole	Single Primary Winding	Dual Secondary Winding	57.2 mm	47.8 mm	36.9 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-6 ST-6-28 Bel Signal Transformer 1: 163,15 kr. 14In Stock	Mfr. Part No. ST-6-28 Mouser Part No 530-ST-6-28	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-6 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	14In Stock	163,15 kr. 152,93 kr. 106,08 kr. 104,51 kr. View 103,32 kr. Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	28 V CT/14 V	20 VA	700 mA/1.4 A	Through Hole	Single Primary Winding	Dual Secondary Winding	57.2 mm	47.8 mm	36.9 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-7 ST-7-20 Bel Signal Transformer 1: 135,03 kr. 40In Stock	Mfr. Part No. ST-7-20 Mouser Part No 530-ST-7-20	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-7 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	40In Stock	135,03 kr. 131,15 kr. 131,07 kr. 121,52 kr. View 117,42 kr. 114,14 kr.	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	20 V CT/10 V	36 VA	1.8 A/3.6 A	Through Hole	Single Primary Winding	Dual Secondary Winding	66.7 mm	55.5 mm	40.4 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-7 ST-7-48 Bel Signal Transformer 1: 202,54 kr. 9In Stock	Mfr. Part No. ST-7-48 Mouser Part No 530-ST-7-48	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-7 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	9In Stock	202,54 kr. 194,56 kr. 143,68 kr. 125,48 kr. View 124,21 kr. 122,64 kr. 121,08 kr. Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	48 V CT/24 V	36 VA	750 mA/1.5 A	Through Hole	Single Primary Winding	Dual Secondary Winding	66.7 mm	55.5 mm	40.4 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 ST-2-48 Bel Signal Transformer 1: 110,33 kr. 28In Stock	Mfr. Part No. ST-2-48 Mouser Part No 530-ST-2-48	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	28In Stock	110,33 kr. 100,93 kr. 99,14 kr. 87,58 kr. 75,57 kr.	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	48 V CT/24 V	1.1 VA	23 mA/46 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	34.9 mm	28.6 mm	24.6 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 ST-5-28 Bel Signal Transformer 1: 104,89 kr. 19In Stock	Mfr. Part No. ST-5-28 Mouser Part No 530-ST-5-28	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	19In Stock	104,89 kr. 93,92 kr. 90,56 kr. 78,63 kr. View 76,47 kr. 71,24 kr. 70,35 kr.	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	28 V CT/14 V	12 VA	420 mA/840 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	48.4 mm	40.4 mm	36.9 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-7 ST-7-12 Bel Signal Transformer 1: 200,00 kr. 17In Stock	Mfr. Part No. ST-7-12 Mouser Part No 530-ST-7-12	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-7 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	17In Stock	200,00 kr. 191,95 kr. 142,19 kr. 124,58 kr. View 123,16 kr. 121,75 kr. 120,33 kr. Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	12.6 V CT/6.3 V	36 VA	2.85 A/5.7 A	Through Hole	Single Primary Winding	Dual Secondary Winding	66.7 mm	55.5 mm	40.4 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-3 ST-3-24 Bel Signal Transformer 1: 64,83 kr. 200Expected 18/12/2026	Mfr. Part No. ST-3-24 Mouser Part No 530-ST-3-24	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-3 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	200Expected 18/12/2026	64,83 kr. 59,38 kr. 59,31 kr. 58,26 kr. View 56,62 kr. 54,83 kr.	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	24 V CT/12 V	2.4 VA	100 mA/200 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	34.9 mm	28.6 mm	30.8 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 ST-4-12 Bel Signal Transformer 1: 89,52 kr. 200On Order	Mfr. Part No. ST-4-12 Mouser Part No 530-ST-4-12	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	200On Order	89,52 kr. 81,31 kr. 75,57 kr. 70,12 kr. View 60,80 kr. 57,82 kr. 55,43 kr. 54,09 kr.	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	12.6 V CT/6.3 V	6 VA	500 mA/1 A	Through Hole	Single Primary Winding	Dual Secondary Winding	41.3 mm	33.3 mm	33.3 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 ST-2-16 Bel Signal Transformer 200: 64,01 kr. Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-2-16 Mouser Part No 530-ST-2-16	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	64,01 kr. 62,29 kr. 54,16 kr. Quote Quote	Min.: 200 Mult.: 100	Class 2 Transformers	115 VAC	16 V CT/8 V	1.1 VA	70 mA/140 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	34.9 mm	28.6 mm	24.6 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 ST-2-20 Bel Signal Transformer 1: 75,12 kr. Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-2-20 Mouser Part No 530-ST-2-20	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	75,12 kr. 69,45 kr. 49,83 kr. 49,01 kr. 48,34 kr.	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	20 V CT/10 V	1.1 VA	55 mA/110 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	34.9 mm	28.6 mm	24.6 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 ST-2-36 Bel Signal Transformer 1: 85,12 kr. Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-2-36 Mouser Part No 530-ST-2-36	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	85,12 kr. 78,78 kr. 56,17 kr. 55,50 kr. View 54,76 kr. 54,09 kr. Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	36 V CT/18 V	1.1 VA	30 mA/60 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	34.9 mm	28.6 mm	24.6 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 ST-2-56 Bel Signal Transformer 100: 65,57 kr. Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-2-56 Mouser Part No 530-ST-2-56	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-2 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	65,57 kr.	Min.: 100 Mult.: 100	Class 2 Transformers	115 VAC	56 V CT/28 V	1.1 VA	20 mA/40 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	34.9 mm	28.6 mm	24.6 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-3 ST-3-120 Bel Signal Transformer 500: 45,58 kr. Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-3-120 Mouser Part No 530-ST-3-120	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-3 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	45,58 kr. 44,46 kr. 44,24 kr.	Min.: 500 Mult.: 100	Class 2 Transformers	115 VAC	120 V CT/60 V	2.4 VA	20 mA/40 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	34.9 mm	28.6 mm	30.8 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-3 ST-4-10 Bel Signal Transformer 1: 90,56 kr. Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-4-10 Mouser Part No 530-ST-4-10	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-3 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	90,56 kr. 81,09 kr. 79,52 kr. 64,45 kr. View 62,89 kr. 62,44 kr. 61,25 kr. 60,50 kr.	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	10 V CT/5 V	6 VA	600 mA/1.2 A	Through Hole	Single Primary Winding	Dual Secondary Winding	41.3 mm	33.3 mm	33.3 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 ST-4-120 Bel Signal Transformer 1: 110,33 kr. Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-4-120 Mouser Part No 530-ST-4-120	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	110,33 kr. 100,93 kr. 99,14 kr. 80,05 kr. View 78,33 kr. 76,84 kr. 76,47 kr.	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	120 V CT/60 V	6 VA	50 mA/100 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	41.3 mm	33.3 mm	33.3 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 ST-4-48 Bel Signal Transformer 1: 100,64 kr. Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-4-48 Mouser Part No 530-ST-4-48	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	100,64 kr. 90,04 kr. 88,33 kr. 71,62 kr. View 69,90 kr. 68,48 kr. 67,29 kr. 66,39 kr.	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	48 V CT/24 V	6 VA	125 mA/250 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	41.3 mm	33.3 mm	33.3 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 ST-4-56 Bel Signal Transformer 100: 91,09 kr. Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-4-56 Mouser Part No 530-ST-4-56	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	91,09 kr. 89,07 kr. 87,36 kr. 86,91 kr. Quote Quote	Min.: 100 Mult.: 50	Class 2 Transformers	115 VAC	56 V CT/28 V	6 VA	110 mA/220 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	41.3 mm	33.3 mm	33.3 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 ST-5-10 Bel Signal Transformer 1: 148,23 kr. Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-5-10 Mouser Part No 530-ST-5-10	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-4 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	148,23 kr. 141,37 kr. 120,11 kr. 117,57 kr. View 113,99 kr. 112,12 kr. Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	10 V CT/5 V	12 VA	1.2 A/2.4 A	Through Hole	Single Primary Winding	Dual Secondary Winding	48.4 mm	40.4 mm	36.9 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 ST-5-120 Bel Signal Transformer 50: 120,48 kr. Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-5-120 Mouser Part No 530-ST-5-120	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	120,48 kr. 119,21 kr. 116,60 kr. 115,18 kr. View Quote	Min.: 50 Mult.: 25	Class 2 Transformers	115 VAC	120 V CT/60 V	12 VA	100 mA/200 mA	Through Hole	Single Primary Winding	Dual Secondary Winding	48.4 mm	40.4 mm	36.9 mm	ST
Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 ST-5-24 Bel Signal Transformer 1: 96,31 kr. Non-Stocked Lead-Time 18 Weeks	Mfr. Part No. ST-5-24 Mouser Part No 530-ST-5-24	Bel Signal Transformer	Power Transformers - Board Mount TRANSFORMER SPLIT-TRAN ST-5 Learn More about Bel Signal Transformer signal transformer st transformers	Datasheet	Non-Stocked Lead-Time 18 Weeks	96,31 kr. 83,93 kr. 75,87 kr. 73,11 kr. View 70,94 kr. 67,66 kr. 62,89 kr. 61,62 kr. Quote	Min.: 1 Mult.: 1	Class 2 Transformers	115 VAC	24 V CT/12 V	12 VA	500 mA/1 A	Through Hole	Single Primary Winding	Dual Secondary Winding	48.4 mm	40.4 mm	36.9 mm	ST