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quality Class F Insulated Split Bobbin Transformer Bel Fuse ST-3-56 for PCB Mounting and Power Applications factory
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quality Class F Insulated Split Bobbin Transformer Bel Fuse ST-3-56 for PCB Mounting and Power Applications factory
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Specifications
Secondary Winding:
2
Isolation Voltage(Vrms):
2.5kV
Primary Winding(s):
1
Secondary Side Voltage:
28V;56V
Output Current:
90mA;45mA
Primary Side Voltage:
115V
Mfr. Part #:
ST-3-56
Package:
Through Hole-6P,34.9x28.6mm
Key Attributes
Model Number: ST-3-56
Product Description

Product Overview

The Signal ST and DST Series Split/Tran Specialty Purpose & Class 2 Transformers are designed for printed circuit board mounting. They utilize a dual cavity platform that provides superior isolation and low capacitive coupling. The rigid pin construction ensures easier board insertion and higher reliability. These transformers are suitable for a wide range of power applications from 1.1 VA to 36 VA, offering single or dual primaries and series or parallel secondaries. They are built with a Class F (155 C) insulation system and meet stringent agency certifications including UL and CSA.

Product Attributes

  • Brand: Signal Transformer (belfuse.com/signal)
  • Series: ST / DST Series Split/Tran
  • Construction: Split Bobbin with Dual Cavity
  • Insulation System: Class F, 155 C
  • RoHS Compliant: Yes
  • 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
    • # UL Recognized UL5085-3, Inherently Limited File # E116583
  • Custom Versions: Available upon request

Technical Specifications

Part Number Secondary RMS Rating (Series) Secondary RMS Rating (Parallel) VA Rating Primary Voltage Frequency Dielectric Strength Size (L x W x H) Weight (lbs/kg) Mounting Hardware
ST-2-10**# / DST-2-10**# 10 VCT @ 0.11 A 5 V @ 0.22 A 1.1 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.37" (34.9mm) x 1.12" (28.6mm) x 0.97" (24.6mm) 0.17 (0.08) -
ST-3-10*# / DST-3-10*# 10 VCT @ 0.25 A 5 V @ 0.5 A 2.4 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.37" (34.9mm) x 1.12" (28.6mm) x 1.21" (30.8mm) 0.25 (0.11) -
ST-4-10*# / DST-4-10*# 10 VCT @ 0.6 A 5 V @ 1.2 A 6 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.62" (41.3mm) x 1.31" (33.3mm) x 1.31" (33.3mm) 0.44 (0.20) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-5-10*# / DST-5-10*# 10 VCT @ 1.2 A 5 V @ 2.4 A 12 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.91" (48.4mm) x 1.59" (40.4mm) x 1.45" (36.9mm) 0.70 (0.32) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-6-10 / DST-6-10 10 VCT @ 2.0 A 5 V @ 4.0 A 20 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 2.25" (57.2mm) x 1.88" (47.8mm) x 1.45" (36.9mm) 0.80 (0.36) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-7-10 / DST-7-10 10 VCT @ 3.6 A 5 V @ 7.2 A 36 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 2.62" (66.7mm) x 2.18" (55.5mm) x 1.59" (40.4mm) 1.1 (0.50) #6 screws (4 mounting holes on 2.18" x 1.75" centers)
ST-2-12**# / DST-2-12**# 12.6 VCT @ 0.09 A 6.3 V @ 0.18 A 1.1 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.37" (34.9mm) x 1.12" (28.6mm) x 0.97" (24.6mm) 0.17 (0.08) -
ST-3-12*# / DST-3-12*# 12.6 VCT @ 0.2 A 6.3 V @ 0.4 A 2.4 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.37" (34.9mm) x 1.12" (28.6mm) x 1.21" (30.8mm) 0.25 (0.11) -
ST-4-12*# / DST-4-12*# 12.6 VCT @ 0.5 A 6.3 V @ 1.0 A 6 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.62" (41.3mm) x 1.31" (33.3mm) x 1.31" (33.3mm) 0.44 (0.20) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-5-12*# / DST-5-12*# 12.6 VCT @ 1.0 A 6.3 V @ 2.0 A 12 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.91" (48.4mm) x 1.59" (40.4mm) x 1.45" (36.9mm) 0.70 (0.32) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-6-12 / DST-6-12 12.6 VCT @ 1.6 A 6.3 V @ 3.2 A 20 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 2.25" (57.2mm) x 1.88" (47.8mm) x 1.45" (36.9mm) 0.80 (0.36) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-7-12 / DST-7-12 12.6 VCT @ 2.85 A 6.3 V @ 5.7 A 36 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 2.62" (66.7mm) x 2.18" (55.5mm) x 1.59" (40.4mm) 1.1 (0.50) #6 screws (4 mounting holes on 2.18" x 1.75" centers)
ST-2-16**# / DST-2-16**# 16 VCT @ 0.07 A 8 V @ 0.14 A 1.1 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.37" (34.9mm) x 1.12" (28.6mm) x 0.97" (24.6mm) 0.17 (0.08) -
ST-3-16*# / DST-3-16*# 16 VCT @ 0.15 A 8 V @ 0.3 A 2.4 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.37" (34.9mm) x 1.12" (28.6mm) x 1.21" (30.8mm) 0.25 (0.11) -
ST-4-16*# / DST-4-16*# 16 VCT @ 0.4 A 8 V @ 0.8 A 6 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.62" (41.3mm) x 1.31" (33.3mm) x 1.31" (33.3mm) 0.44 (0.20) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-5-16*# / DST-5-16*# 16 VCT @ 0.8 A 8 V @ 1.6 A 12 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.91" (48.4mm) x 1.59" (40.4mm) x 1.45" (36.9mm) 0.70 (0.32) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-6-16 / DST-6-16 16 VCT @ 1.25 A 8 V @ 2.5 A 20 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 2.25" (57.2mm) x 1.88" (47.8mm) x 1.45" (36.9mm) 0.80 (0.36) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-7-16 / DST-7-16 16 VCT @ 2.25 A 8 V @ 4.5 A 36 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 2.62" (66.7mm) x 2.18" (55.5mm) x 1.59" (40.4mm) 1.1 (0.50) #6 screws (4 mounting holes on 2.18" x 1.75" centers)
ST-2-20**# / DST-2-20**# 20 VCT @ 0.055 A 10 V @ 0.11 A 1.1 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.37" (34.9mm) x 1.12" (28.6mm) x 0.97" (24.6mm) 0.17 (0.08) -
ST-3-20*# / DST-3-20*# 20 VCT @ 0.12 A 10 V @ 0.24 A 2.4 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.37" (34.9mm) x 1.12" (28.6mm) x 1.21" (30.8mm) 0.25 (0.11) -
ST-4-20*# / DST-4-20*# 20 VCT @ 0.3 A 10 V @ 0.6 A 6 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.62" (41.3mm) x 1.31" (33.3mm) x 1.31" (33.3mm) 0.44 (0.20) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-5-20*# / DST-5-20*# 20 VCT @ 0.6 A 10 V @ 1.2 A 12 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.91" (48.4mm) x 1.59" (40.4mm) x 1.45" (36.9mm) 0.70 (0.32) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-6-20 / DST-6-20 20 VCT @ 1.0 A 10 V @ 2.0 A 20 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 2.25" (57.2mm) x 1.88" (47.8mm) x 1.45" (36.9mm) 0.80 (0.36) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-7-20 / DST-7-20 20 VCT @ 1.8 A 10 V @ 3.6 A 36 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 2.62" (66.7mm) x 2.18" (55.5mm) x 1.59" (40.4mm) 1.1 (0.50) #6 screws (4 mounting holes on 2.18" x 1.75" centers)
ST-2-24**# / DST-2-24**# 24 VCT @ 0.045 A 12 V @ 0.09 A 1.1 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.37" (34.9mm) x 1.12" (28.6mm) x 0.97" (24.6mm) 0.17 (0.08) -
ST-3-24*# / DST-3-24*# 24 VCT @ 0.1 A 12 V @ 0.2 A 2.4 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.37" (34.9mm) x 1.12" (28.6mm) x 1.21" (30.8mm) 0.25 (0.11) -
ST-4-24*# / DST-4-24*# 24 VCT @ 0.25 A 12 V @ 0.5 A 6 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.62" (41.3mm) x 1.31" (33.3mm) x 1.31" (33.3mm) 0.44 (0.20) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-5-24*# / DST-5-24*# 24 VCT @ 0.5 A 12 V @ 1.0 A 12 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.91" (48.4mm) x 1.59" (40.4mm) x 1.45" (36.9mm) 0.70 (0.32) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-6-24 / DST-6-24 24 VCT @ 0.8 A 12 V @ 1.6 A 20 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 2.25" (57.2mm) x 1.88" (47.8mm) x 1.45" (36.9mm) 0.80 (0.36) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-7-24 / DST-7-24 24 VCT @ 1.5 A 12 V @ 3.0 A 36 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 2.62" (66.7mm) x 2.18" (55.5mm) x 1.59" (40.4mm) 1.1 (0.50) #6 screws (4 mounting holes on 2.18" x 1.75" centers)
ST-2-28 / DST-2-28 28 VCT @ 0.04 A 14 V @ 0.08 A 1.1 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.37" (34.9mm) x 1.12" (28.6mm) x 0.97" (24.6mm) 0.17 (0.08) -
ST-3-28 / DST-3-28 28 VCT @ 0.085 A 14 V @ 0.17 A 2.4 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.37" (34.9mm) x 1.12" (28.6mm) x 1.21" (30.8mm) 0.25 (0.11) -
ST-4-28 / DST-4-28 28 VCT @ 0.2 A 14 V @ 0.4 A 6 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.62" (41.3mm) x 1.31" (33.3mm) x 1.31" (33.3mm) 0.44 (0.20) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-5-28 / DST-5-28 28 VCT @ 0.42 A 14 V @ 0.84 A 12 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.91" (48.4mm) x 1.59" (40.4mm) x 1.45" (36.9mm) 0.70 (0.32) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-6-28 / DST-6-28 28 VCT @ 0.7 A 14 V @ 1.4 A 20 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 2.25" (57.2mm) x 1.88" (47.8mm) x 1.45" (36.9mm) 0.80 (0.36) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-7-28 / DST-7-28 28 VCT @ 1.3 A 14 V @ 2.6 A 36 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 2.62" (66.7mm) x 2.18" (55.5mm) x 1.59" (40.4mm) 1.1 (0.50) #6 screws (4 mounting holes on 2.18" x 1.75" centers)
ST-2-36 / DST-2-36 36 VCT @ 0.03 A 18 V @ 0.06 A 1.1 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.37" (34.9mm) x 1.12" (28.6mm) x 0.97" (24.6mm) 0.17 (0.08) -
ST-3-36 / DST-3-36 36 VCT @ 0.065 A 18 V @ 0.13 A 2.4 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.37" (34.9mm) x 1.12" (28.6mm) x 1.21" (30.8mm) 0.25 (0.11) -
ST-4-36 / DST-4-36 36 VCT @ 0.17 A 18 V @ 0.34 A 6 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.62" (41.3mm) x 1.31" (33.3mm) x 1.31" (33.3mm) 0.44 (0.20) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-5-36 / DST-5-36 36 VCT @ 0.35 A 18 V @ 0.7 A 12 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.91" (48.4mm) x 1.59" (40.4mm) x 1.45" (36.9mm) 0.70 (0.32) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-6-36 / DST-6-36 36 VCT @ 0.55 A 18 V @ 1.1 A 20 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 2.25" (57.2mm) x 1.88" (47.8mm) x 1.45" (36.9mm) 0.80 (0.36) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-7-36 / DST-7-36 36 VCT @ 1.0 A 18 V @ 2.0 A 36 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 2.62" (66.7mm) x 2.18" (55.5mm) x 1.59" (40.4mm) 1.1 (0.50) #6 screws (4 mounting holes on 2.18" x 1.75" centers)
ST-2-48 / DST-2-48 48 VCT @ 0.023 A 24 V @ 0.046 A 1.1 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.37" (34.9mm) x 1.12" (28.6mm) x 0.97" (24.6mm) 0.17 (0.08) -
ST-3-48 / DST-3-48 48 VCT @ 0.05 A 24 V @ 0.1 A 2.4 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.37" (34.9mm) x 1.12" (28.6mm) x 1.21" (30.8mm) 0.25 (0.11) -
ST-4-48 / DST-4-48 48 VCT @ 0.125 A 24 V @ 0.25 A 6 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.62" (41.3mm) x 1.31" (33.3mm) x 1.31" (33.3mm) 0.44 (0.20) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-5-48 / DST-5-48 48 VCT @ 0.25 A 24 V @ 0.5 A 12 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.91" (48.4mm) x 1.59" (40.4mm) x 1.45" (36.9mm) 0.70 (0.32) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-6-48 / DST-6-48 48 VCT @ 0.4 A 24 V @ 0.8 A 20 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 2.25" (57.2mm) x 1.88" (47.8mm) x 1.45" (36.9mm) 0.80 (0.36) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-7-48 / DST-7-48 48 VCT @ 0.75 A 24 V @ 1.5 A 36 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 2.62" (66.7mm) x 2.18" (55.5mm) x 1.59" (40.4mm) 1.1 (0.50) #6 screws (4 mounting holes on 2.18" x 1.75" centers)
ST-2-56 / DST-2-56 56 VCT @ 0.02 A 28 V @ 0.04 A 1.1 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.37" (34.9mm) x 1.12" (28.6mm) x 0.97" (24.6mm) 0.17 (0.08) -
ST-3-56 / DST-3-56 56 VCT @ 0.045 A 28 V @ 0.09 A 2.4 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.37" (34.9mm) x 1.12" (28.6mm) x 1.21" (30.8mm) 0.25 (0.11) -
ST-4-56 / DST-4-56 56 VCT @ 0.11 A 28 V @ 0.22 A 6 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.62" (41.3mm) x 1.31" (33.3mm) x 1.31" (33.3mm) 0.44 (0.20) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-5-56 / DST-5-56 56 VCT @ 0.22 A 28 V @ 0.44 A 12 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.91" (48.4mm) x 1.59" (40.4mm) x 1.45" (36.9mm) 0.70 (0.32) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-6-56 / DST-6-56 56 VCT @ 0.35 A 28 V @ 0.7 A 20 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 2.25" (57.2mm) x 1.88" (47.8mm) x 1.45" (36.9mm) 0.80 (0.36) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-7-56 / DST-7-56 56 VCT @ 0.65 A 28 V @ 1.3 A 36 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 2.62" (66.7mm) x 2.18" (55.5mm) x 1.59" (40.4mm) 1.1 (0.50) #6 screws (4 mounting holes on 2.18" x 1.75" centers)
ST-2-120 / DST-2-120 120 VCT @ 0.01 A 60 V @ 0.02 A 1.1 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.37" (34.9mm) x 1.12" (28.6mm) x 0.97" (24.6mm) 0.17 (0.08) -
ST-3-120 / DST-3-120 120 VCT @ 0.02 A 60 V @ 0.04 A 2.4 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.37" (34.9mm) x 1.12" (28.6mm) x 1.21" (30.8mm) 0.25 (0.11) -
ST-4-120 / DST-4-120 120 VCT @ 0.05 A 60 V @ 0.1 A 6 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.62" (41.3mm) x 1.31" (33.3mm) x 1.31" (33.3mm) 0.44 (0.20) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-5-120 / DST-5-120 120 VCT @ 0.1 A 60 V @ 0.2 A 12 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 1.91" (48.4mm) x 1.59" (40.4mm) x 1.45" (36.9mm) 0.70 (0.32) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-6-120 / DST-6-120 120 VCT @ 0.16 A 60 V @ 0.32 A 20 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 2.25" (57.2mm) x 1.88" (47.8mm) x 1.45" (36.9mm) 0.80 (0.36) Nylon 4-40 x 1.37" (4-40 x 34.9mm)
ST-7-120 / DST-7-120 120 VCT @ 0.3 A 60 V @ 0.6 A 36 115 V / 115/230 V 50/60 Hz 2500 Vrms Hipot 2.62" (66.7mm) x 2.18" (55.5mm) x 1.59" (40.4mm) 1.1 (0.50) #6 screws (4 mounting holes on 2.18" x 1.75" centers)

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

Mounting Hardware: See Accessories datasheet for mounting screw information. ST-MS (screw) and ST-MN (nut) available from Signal.

Pinout Diagrams:

6 Pin Type ST (115 V, 50/60 Hz): 1, 2, 3, 4, 5, 6, 7, 8 (4 indicates like polarity)

8 Pin Type DST (115/230 V, 50/60 Hz): 1, 2, 3, 4, 5, 6, 7, 8 (2 indicates like polarity)


2411272143_Bel-Fuse-ST-3-56_C17257624.pdf

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