Durable Class 2 transformer Bel Fuse ST-7-24 featuring split bobbin construction and rigid pin design

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Product Description

Bel Fuse Signal ST/DST Series Split/Tran Specialty Purpose & Class 2 Transformers

The Signal ST and DST transformers are designed for specialty purposes and Class 2 applications, utilizing a split bobbin construction with dual cavities. This design provides superior isolation and low capacitive coupling, enhancing reliability. The rigid pin construction facilitates easier board insertion. These transformers are suitable for a wide range of power applications, from 1.1 VA to 36 VA, and are built to meet stringent agency certifications.

Product Attributes

Brand: Bel Fuse Signal
Series: ST / DST Series Split/Tran
Construction: Split Bobbin with Dual Cavity
Insulation System: Class F, 155 C
RoHS Compliant
Agency Certifications:
- UL 1446 Class F insulation systems, File # E66312
- UL Recognized 506 / UL 5085-1, 2, File # E63829
- CSA certified to C22.2 #66.1, File # 221070
- cCSAus certified to C22.2 #66.3 / UL 5085-3, File #221070
- Class 2 - marked with (*) or (**) or (#)
- (*) CSA certified as Inherently Limited
- (**) CSA certified as Non Inherently Limited - see recommended fuse rating table.
- (#) UL Recognized UL5085-3, Inherently Limited File # E116583

Technical Specifications

Part Number	Secondary RMS Rating	VA Rating	Size (L x W x H inches)	Weight (lbs)
ST-2-10# / DST-2-10#	10 VCT @ 0.11 A / 5 V @ 0.22 A	1.1	1.37 x 1.12 x 0.97 (34.9 x 28.6 x 24.6)	0.17 (0.08)
ST-3-10# / DST-3-10#	10 VCT @ 0.25 A (5) / 5 V @ 0.5 A (9)	2.4	1.37 x 1.12 x 1.21 (34.9 x 28.6 x 30.8)	0.25 (0.11)
ST-4-10# / DST-4-10#	10 VCT @ 0.6 A (9) / 5 V @ 1.2 A (11)	6	1.62 x 1.31 x 1.31 (41.3 x 33.3 x 33.3)	0.44 (0.20)
ST-5-10# / DST-5-10#	10 VCT @ 1.2 A (11) / 5 V @ 2.4 A (13)	12	1.91 x 1.59 x 1.45 (48.4 x 40.4 x 36.9)	0.70 (0.32)
ST-6-10 / DST-6-10	10 VCT @ 2.0 A / 5 V @ 4.0 A	20	2.25 x 1.88 x 1.45 (57.2 x 47.8 x 36.9)	0.80 (0.36)
ST-7-10 / DST-7-10	10 VCT @ 3.6 A / 5 V @ 7.2 A	36	2.62 x 2.18 x 1.59 (66.7 x 55.5 x 40.4)	1.1 (0.50)
ST-2-12# / DST-2-12#	12.6 VCT @ 0.09 A / 6.3 V @ 0.18 A	1.1	1.37 x 1.12 x 0.97 (34.9 x 28.6 x 24.6)	0.17 (0.08)
ST-3-12# / DST-3-12#	12.6 VCT @ 0.2 A (4) / 6.3 V @ 0.4 A (8)	2.4	1.37 x 1.12 x 1.21 (34.9 x 28.6 x 30.8)	0.25 (0.11)
ST-4-12# / DST-4-12#	12.6 VCT @ 0.5 A (9) / 6.3 V @ 1.0 A (11)	6	1.62 x 1.31 x 1.31 (41.3 x 33.3 x 33.3)	0.44 (0.20)
ST-5-12# / DST-5-12#	12.6 VCT @ 1.0 A (11) / 6.3 V @ 2.0 A (13)	12	1.91 x 1.59 x 1.45 (48.4 x 40.4 x 36.9)	0.70 (0.32)
ST-6-12 / DST-6-12	12.6 VCT @ 1.6 A / 6.3 V @ 3.2 A	20	2.25 x 1.88 x 1.45 (57.2 x 47.8 x 36.9)	0.80 (0.36)
ST-7-12 / DST-7-12	12.6 VCT @ 2.85 A / 6.3 V @ 5.7 A	36	2.62 x 2.18 x 1.59 (66.7 x 55.5 x 40.4)	1.1 (0.50)
ST-2-16# / DST-2-16#	16 VCT @ 0.07 A / 8 V @ 0.14 A	1.1	1.37 x 1.12 x 0.97 (34.9 x 28.6 x 24.6)	0.17 (0.08)
ST-3-16# / DST-3-16#	16 VCT @ 0.15 A (3) / 8 V @ 0.3 A (6)	2.4	1.37 x 1.12 x 1.21 (34.9 x 28.6 x 30.8)	0.25 (0.11)
ST-4-16# / DST-4-16#	16 VCT @ 0.4 A (7) / 8 V @ 0.8 A (10)	6	1.62 x 1.31 x 1.31 (41.3 x 33.3 x 33.3)	0.44 (0.20)
ST-5-16# / DST-5-16#	16 VCT @ 0.8 A (10) / 8 V @ 1.6 A (12)	12	1.91 x 1.59 x 1.45 (48.4 x 40.4 x 36.9)	0.70 (0.32)
ST-6-16 / DST-6-16	16 VCT @ 1.25 A / 8 V @ 2.5 A	20	2.25 x 1.88 x 1.45 (57.2 x 47.8 x 36.9)	0.80 (0.36)
ST-7-16 / DST-7-16	16 VCT @ 2.25 A / 8 V @ 4.5 A	36	2.62 x 2.18 x 1.59 (66.7 x 55.5 x 40.4)	1.1 (0.50)
ST-2-20# / DST-2-20#	20 VCT @ 0.055 A / 10 V @ 0.11 A	1.1	1.37 x 1.12 x 0.97 (34.9 x 28.6 x 24.6)	0.17 (0.08)
ST-3-20# / DST-3-20#	20 VCT @ 0.12 A (2) / 10 V @ 0.24 A (5)	2.4	1.37 x 1.12 x 1.21 (34.9 x 28.6 x 30.8)	0.25 (0.11)
ST-4-20# / DST-4-20#	20 VCT @ 0.3 A (6) / 10 V @ 0.6 A (9)	6	1.62 x 1.31 x 1.31 (41.3 x 33.3 x 33.3)	0.44 (0.20)
ST-5-20# / DST-5-20#	20 VCT @ 0.6 A (9) / 10 V @ 1.2 A (11)	12	1.91 x 1.59 x 1.45 (48.4 x 40.4 x 36.9)	0.70 (0.32)
ST-6-20 / DST-6-20	20 VCT @ 1.0 A / 10 V @ 2.0 A	20	2.25 x 1.88 x 1.45 (57.2 x 47.8 x 36.9)	0.80 (0.36)
ST-7-20 / DST-7-20	20 VCT @ 1.8 A / 10 V @ 3.6 A	36	2.62 x 2.18 x 1.59 (66.7 x 55.5 x 40.4)	1.1 (0.50)
ST-2-24# / DST-2-24#	24 VCT @ 0.045 A / 12 V @ 0.09 A	1.1	1.37 x 1.12 x 0.97 (34.9 x 28.6 x 24.6)	0.17 (0.08)
ST-3-24# / DST-3-24#	24 VCT @ 0.1 A (1) / 12 V @ 0.2 A (4)	2.4	1.37 x 1.12 x 1.21 (34.9 x 28.6 x 30.8)	0.25 (0.11)
ST-4-24# / DST-4-24#	24 VCT @ 0.25 A (5) / 12 V @ 0.5 A (9)	6	1.62 x 1.31 x 1.31 (41.3 x 33.3 x 33.3)	0.44 (0.20)
ST-5-24# / DST-5-24#	24 VCT @ 0.5 A (9) / 12 V @ 1.0 A (11)	12	1.91 x 1.59 x 1.45 (48.4 x 40.4 x 36.9)	0.70 (0.32)
ST-6-24 / DST-6-24	24 VCT @ 0.8 A / 12 V @ 1.6 A	20	2.25 x 1.88 x 1.45 (57.2 x 47.8 x 36.9)	0.80 (0.36)
ST-7-24 / DST-7-24	24 VCT @ 1.5 A / 12 V @ 3.0 A	36	2.62 x 2.18 x 1.59 (66.7 x 55.5 x 40.4)	1.1 (0.50)
ST-2-28 / DST-2-28	28 VCT @ 0.04 A / 14 V @ 0.08 A	1.1	1.37 x 1.12 x 0.97 (34.9 x 28.6 x 24.6)	0.17 (0.08)
ST-3-28 / DST-3-28	28 VCT @ 0.085 A / 14 V @ 0.17 A	2.4	1.37 x 1.12 x 1.21 (34.9 x 28.6 x 30.8)	0.25 (0.11)
ST-4-28 / DST-4-28	28 VCT @ 0.2 A / 14 V @ 0.4 A	6	1.62 x 1.31 x 1.31 (41.3 x 33.3 x 33.3)	0.44 (0.20)
ST-5-28 / DST-5-28	28 VCT @ 0.42 A / 14 V @ 0.84 A	12	1.91 x 1.59 x 1.45 (48.4 x 40.4 x 36.9)	0.70 (0.32)
ST-6-28 / DST-6-28	28 VCT @ 0.7 A / 14 V @ 1.4 A	20	2.25 x 1.88 x 1.45 (57.2 x 47.8 x 36.9)	0.80 (0.36)
ST-7-28 / DST-7-28	28 VCT @ 1.3 A / 14 V @ 2.6 A	36	2.62 x 2.18 x 1.59 (66.7 x 55.5 x 40.4)	1.1 (0.50)
ST-2-36 / DST-2-36	36 VCT @ 0.03 A / 18 V @ 0.06 A	1.1	1.37 x 1.12 x 0.97 (34.9 x 28.6 x 24.6)	0.17 (0.08)
ST-3-36 / DST-3-36	36 VCT @ 0.065 A / 18 V @ 0.13 A	2.4	1.37 x 1.12 x 1.21 (34.9 x 28.6 x 30.8)	0.25 (0.11)
ST-4-36 / DST-4-36	36 VCT @ 0.17 A / 18 V @ 0.34 A	6	1.62 x 1.31 x 1.31 (41.3 x 33.3 x 33.3)	0.44 (0.20)
ST-5-36 / DST-5-36	36 VCT @ 0.35 A / 18 V @ 0.7 A	12	1.91 x 1.59 x 1.45 (48.4 x 40.4 x 36.9)	0.70 (0.32)
ST-6-36 / DST-6-36	36 VCT @ 0.55 A / 18 V @ 1.1 A	20	2.25 x 1.88 x 1.45 (57.2 x 47.8 x 36.9)	0.80 (0.36)
ST-7-36 / DST-7-36	36 VCT @ 1.0 A / 18 V @ 2.0 A	36	2.62 x 2.18 x 1.59 (66.7 x 55.5 x 40.4)	1.1 (0.50)
ST-2-48 / DST-2-48	48 VCT @ 0.023 A / 24 V @ 0.046 A	1.1	1.37 x 1.12 x 0.97 (34.9 x 28.6 x 24.6)	0.17 (0.08)
ST-3-48 / DST-3-48	48 VCT @ 0.05 A / 24 V @ 0.1 A	2.4	1.37 x 1.12 x 1.21 (34.9 x 28.6 x 30.8)	0.25 (0.11)
ST-4-48 / DST-4-48	48 VCT @ 0.125 A / 24 V @ 0.25 A	6	1.62 x 1.31 x 1.31 (41.3 x 33.3 x 33.3)	0.44 (0.20)
ST-5-48 / DST-5-48	48 VCT @ 0.25 A / 24 V @ 0.5 A	12	1.91 x 1.59 x 1.45 (48.4 x 40.4 x 36.9)	0.70 (0.32)
ST-6-48 / DST-6-48	48 VCT @ 0.4 A / 24 V @ 0.8 A	20	2.25 x 1.88 x 1.45 (57.2 x 47.8 x 36.9)	0.80 (0.36)
ST-7-48 / DST-7-48	48 VCT @ 0.75 A / 24 V @ 1.5 A	36	2.62 x 2.18 x 1.59 (66.7 x 55.5 x 40.4)	1.1 (0.50)
ST-2-56 / DST-2-56	56 VCT @ 0.02 A / 28 V @ 0.04 A	1.1	1.37 x 1.12 x 0.97 (34.9 x 28.6 x 24.6)	0.17 (0.08)
ST-3-56 / DST-3-56	56 VCT @ 0.045 A / 28 V @ 0.09 A	2.4	1.37 x 1.12 x 1.21 (34.9 x 28.6 x 30.8)	0.25 (0.11)
ST-4-56 / DST-4-56	56 VCT @ 0.11 A / 28 V @ 0.22 A	6	1.62 x 1.31 x 1.31 (41.3 x 33.3 x 33.3)	0.44 (0.20)
ST-5-56 / DST-5-56	56 VCT @ 0.22 A / 28 V @ 0.44 A	12	1.91 x 1.59 x 1.45 (48.4 x 40.4 x 36.9)	0.70 (0.32)
ST-6-56 / DST-6-56	56 VCT @ 0.35 A / 28 V @ 0.7 A	20	2.25 x 1.88 x 1.45 (57.2 x 47.8 x 36.9)	0.80 (0.36)
ST-7-56 / DST-7-56	56 VCT @ 0.65A / 28 V @ 1.3 A	36	2.62 x 2.18 x 1.59 (66.7 x 55.5 x 40.4)	1.1 (0.50)
ST-2-120 / DST-2-120	120 VCT @ 0.01 A / 60 V @ 0.02 A	1.1	1.37 x 1.12 x 0.97 (34.9 x 28.6 x 24.6)	0.17 (0.08)
ST-3-120 / DST-3-120	120 VCT @ 0.02 A / 60 V @ 0.04 A	2.4	1.37 x 1.12 x 1.21 (34.9 x 28.6 x 30.8)	0.25 (0.11)
ST-4-120 / DST-4-120	120 VCT @ 0.05 A / 60 V @ 0.1 A	6	1.62 x 1.31 x 1.31 (41.3 x 33.3 x 33.3)	0.44 (0.20)
ST-5-120 / DST-5-120	120 VCT @ 0.1 A / 60 V @ 0.2 A	12	1.91 x 1.59 x 1.45 (48.4 x 40.4 x 36.9)	0.70 (0.32)
ST-6-120 / DST-6-120	120 VCT @ 0.16 A / 60 V @ 0.32 A	20	2.25 x 1.88 x 1.45 (57.2 x 47.8 x 36.9)	0.80 (0.36)
ST-7-120 / DST-7-120	120 VCT @ 0.3 A / 60 V @ 0.6 A	36	2.62 x 2.18 x 1.59 (66.7 x 55.5 x 40.4)	1.1 (0.50)
General Specifications: Power: 1.1 VA to 36 VA Dielectric Strength: 2500 Vrms Hipot Primaries: Single or dual primaries, 115 V or 115/230 V, 50/60 Hz Secondaries: Series or parallel Electrostatic Shield: Not necessary, split bobbin construction Insulation System: Class F, 155 C Mounting Hardware: See chart (ST-MS screw, ST-MN nut available from Signal)
Recommended Secondary Fuse Values: (1) 0.125 A, (2) 0.15 A, (3) 0.25 A, (4) 0.3 A, (5) 0.375 A, (6) 0.4 A, (7) 0.5 A, (8) 0.6 A, (9) 0.75 A, (10) 1.0 A, (11) 1.5 A, (12) 2.0 A, (13) 3.0 A
Mechanical Specifications (Size 7): Mounting: 4 mounting holes on 2.18 x 1.75 centers for #6 screws.