Durable Split Bobbin Transformer Bel Fuse ST-5-28 with High Dielectric Strength and PCB Mount Design
Bel Fuse Signal ST / DST Series Split Bobbin Transformers
Product Overview
The Bel Fuse Signal ST and DST Series Split Bobbin Transformers are specialty purpose and Class 2 transformers designed for printed circuit board mounting. Utilizing a dual cavity platform, these transformers offer superior isolation and low capacitive coupling, making them ideal for applications requiring high isolation. The rigid pin construction ensures easier board insertion and enhanced reliability. These transformers are suitable for a wide range of power applications, from 1.1 VA to 36 VA.
Product Attributes
- Brand: Bel Fuse Signal (Signal Transformer)
- Series: ST / DST Series
- Construction: Split Bobbin with Dual Cavity
- Insulation System: Class F, 155 C
- Certifications: UL 1446, UL Recognized 506 / UL 5085-1, 2, CSA certified to C22.2 #66.1, cCSAus certified to C22.2 #66.3 / UL 5085-3
- Compliance: RoHS Compliant
- Customization: Custom versions available upon request.
Technical Specifications
| Model Type | Primary Voltage (50/60 Hz) | Secondary RMS Rating | VA Rating | Dielectric Strength (Hipot) | Pin Configuration | Dimensions (L x W x H) | Weight (lbs/kg) |
|---|---|---|---|---|---|---|---|
| ST (Single Primary) | 115 V | Series or Parallel | 1.1 to 36 VA | 2500 Vrms | 6 Pin | Varies by VA (see table below) | Varies by VA (see table below) |
| DST (Dual Primaries) | 115 V or 115/230 V | Series or Parallel | 1.1 to 36 VA | 2500 Vrms | 8 Pin | Varies by VA (see table below) | Varies by VA (see table below) |
| Specific Part Number Examples & Secondary Ratings: | |||||||
| ST-2-10**# | 115 V | 10 VCT @ 0.11 A / 5 V @ 0.22 A | - | - | 6 Pin | - | - |
| DST-3-10*# | 115/230 V | 10 VCT @ 0.25 A (5) / 5 V @ 0.5 A (9) | - | - | 8 Pin | - | - |
| ST-6-12 | 115 V | 12.6 VCT @ 2.0 A / 6.3 V @ 4.0 A | - | - | 6 Pin | - | - |
| DST-7-16 | 115/230 V | 16 VCT @ 2.25 A / 8 V @ 4.5 A | - | - | 8 Pin | - | - |
| ST-5-20*# | 115 V | 20 VCT @ 0.6 A (9) / 10 V @ 1.2 A (11) | - | - | 6 Pin | - | - |
| DST-4-24*# | 115/230 V | 24 VCT @ 0.25 A (5) / 12 V @ 0.5 A (9) | - | - | 8 Pin | - | - |
| ST-7-28 | 115 V | 28 VCT @ 1.3 A / 14 V @ 2.6 A | - | - | 6 Pin | - | - |
| DST-6-36 | 115/230 V | 36 VCT @ 0.55 A / 18 V @ 1.1 A | - | - | 8 Pin | - | - |
| ST-4-48 DST-4-48 | 115 V / 115/230 V | 48 VCT @ 0.125 A / 24 V @ 0.25 A | - | - | 6 Pin / 8 Pin | - | - |
| ST-7-56 DST-7-56 | 115 V / 115/230 V | 56 VCT @ 0.65 A / 28 V @ 1.3 A | - | - | 6 Pin / 8 Pin | - | - |
| ST-6-120 DST-6-120 | 115 V / 115/230 V | 120 VCT @ 0.16 A / 60 V @ 0.32 A | - | - | 6 Pin / 8 Pin | - | - |
| Mechanical Specifications: | |||||||
| Size VA | L (inches/mm) | W (inches/mm) | H (inches/mm) | ML (inches/mm) | A (inches/mm) | B (inches/mm) | C (inches/mm) |
| 1.1 | 1.37 (34.9) | 1.12 (28.6) | 0.97 (24.6) | - | 0.25 (6.4) | 0.25 (6.4) | 1.20 (30.5) |
| 2.4 | 1.37 (34.9) | 1.12 (28.6) | 1.21 (30.8) | - | 0.25 (6.4) | 0.25 (6.4) | 1.20 (30.5) |
| 6 | 1.62 (41.3) | 1.31 (33.3) | 1.31 (33.3) | 1.06 (26.9) | 0.25 (6.4) | 0.35 (8.9) | 1.25 (31.8) |
| 12 | 1.91 (48.4) | 1.59 (40.4) | 1.45 (36.9) | 1.25 (31.8) | 0.30 (7.6) | 0.40 (10.2) | 1.41 (35.8) |
| 20 | 2.25 (57.2) | 1.88 (47.8) | 1.45 (36.9) | 1.50 (38.1) | 0.30 (7.6) | 0.40 (10.2) | 1.60 (40.6) |
| 36 | 2.62 (66.7) | 2.18 (55.5) | 1.59 (40.4) | - | 0.40 (10.2) | 0.40 (10.2) | 1.85 (47.0) |
| Mounting Hardware (Optional): Nylon 4-40 x 1.37 (4-40 x 34.9) screws and nuts available (ST-MS, ST-MN). Size 7 has 4 mounting holes on 2.18 x 1.75 centers for #6 screws. | |||||||
Note: Specific secondary fuse ratings are indicated by symbols (*), (**), or (#) in the part number and are detailed in a separate fuse rating table. Specifications are subject to change without notice.
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