Product Overview
The Bel Fuse/Signal ST and DST Series Split/Tran Specialty Purpose & Class 2 Transformers are designed for high isolation and low capacitive coupling applications. Utilizing a split bobbin construction with dual cavities, these transformers offer superior performance and reliability. They feature rigid pin construction for easier board insertion and are suitable for a wide range of power applications from 1.1 VA to 36 VA. These transformers are built with a Class F (155C) insulation system and are available in single or dual primary configurations with various secondary voltage and current ratings. They are ideal for applications requiring robust isolation and dependable signal transmission.
Product Attributes
- Brand: Bel Fuse/Signal
- Series: ST / DST Series Split/Tran
- Construction: Split Bobbin with Dual Cavity
- Insulation System: Class F, 155C
- RoHS Compliant: Yes
- Agency 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, UL Recognized UL5085-3 (Inherently Limited)
- Customization: Custom versions available upon request.
Technical Specifications
| Part Number (Example) | Secondary RMS Rating | Primary Configuration | VA Rating | Dielectric Strength | Insulation System | Weight (lbs/kg) |
|---|---|---|---|---|---|---|
| ST-2-10**# | 10 VCT @ 0.11 A / 5 V @ 0.22 A | Single 115 V (6 Pin) | 1.1 | 2500 Vrms Hipot | Class F, 155C | 0.17 (0.08) |
| DST-3-10*# | 10 VCT @ 0.25 A (5) / 5 V @ 0.5 A (9) | Dual 115/230 V (8 Pin) | 2.4 | 2500 Vrms Hipot | Class F, 155C | 0.25 (0.11) |
| ST-4-12*# | 12.6 VCT @ 0.5 A (9) / 6.3 V @ 1.0 A (11) | Single 115 V (6 Pin) | 6 | 2500 Vrms Hipot | Class F, 155C | 0.44 (0.20) |
| DST-5-16*# | 16 VCT @ 0.8 A (10) / 8 V @ 1.6 A (12) | Dual 115/230 V (8 Pin) | 12 | 2500 Vrms Hipot | Class F, 155C | 0.70 (0.32) |
| ST-6-20 | 20 VCT @ 1.0 A / 10 V @ 2.0 A | Single 115 V (6 Pin) | 20 | 2500 Vrms Hipot | Class F, 155C | 0.80 (0.36) |
| DST-7-24 | 24 VCT @ 1.5 A / 12 V @ 3.0 A | Dual 115/230 V (8 Pin) | 36 | 2500 Vrms Hipot | Class F, 155C | 1.1 (0.50) |
| ST-6-36 | 36 VCT @ 0.55 A / 18 V @ 1.1 A | Single 115 V (6 Pin) | 20 | 2500 Vrms Hipot | Class F, 155C | 0.80 (0.36) |
| DST-7-48 | 48 VCT @ 0.75 A / 24 V @ 1.5 A | Dual 115/230 V (8 Pin) | 36 | 2500 Vrms Hipot | Class F, 155C | 1.1 (0.50) |
| ST-6-56 | 56 VCT @ 0.35 A / 28 V @ 0.7 A | Single 115 V (6 Pin) | 20 | 2500 Vrms Hipot | Class F, 155C | 0.80 (0.36) |
| DST-7-120 | 120 VCT @ 0.3 A / 60 V @ 0.6 A | Dual 115/230 V (8 Pin) | 36 | 2500 Vrms Hipot | Class F, 155C | 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 due to split bobbin construction
Mechanical Specifications (Examples):
| Size VA | L (inches/mm) | W (inches/mm) | H (inches/mm) | Weight (lbs/kg) |
|---|---|---|---|---|
| 1.1 | 1.37 (34.9) | 1.12 (28.6) | 0.97 (24.6) | 0.17 (0.08) |
| 2.4 | 1.37 (34.9) | 1.12 (28.6) | 1.21 (30.8) | 0.25 (0.11) |
| 6 | 1.62 (41.3) | 1.31 (33.3) | 1.31 (33.3) | 0.44 (0.20) |
| 12 | 1.91 (48.4) | 1.59 (40.4) | 1.45 (36.9) | 0.70 (0.32) |
| 20 | 2.25 (57.2) | 1.88 (47.8) | 1.45 (36.9) | 0.80 (0.36) |
| 36 | 2.62 (66.7) | 2.18 (55.5) | 1.59 (40.4) | 1.1 (0.50) |
Note: Mounting hardware and screw/nut information available in separate Accessories datasheet. Size 7 has 4 mounting holes on 2.18 x 1.75 centers for #6 screws.
2411272143_Bel-Fuse-DST-3-56_C17493825.pdf
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