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China Split Bobbin Transformer Bel Fuse ST-4-28 from Signal Transformer Series with Class F insulation and pin design for sale

Split Bobbin Transformer Bel Fuse ST-4-28 from Signal Transformer Series with Class F insulation and pin design

Price Negotiable
Price: Negotiable
MOQ: Negotiable
Delivery Time: Negotiable
Product Description

Signal ST / DST Series Split Bobbin Transformers

Product Overview

The Signal ST and DST Series Split Bobbin Transformers are specialty purpose and Class 2 transformers designed for high isolation and low capacitive coupling. Utilizing a dual cavity platform, these transformers offer rigid pin construction for enhanced board insertion reliability. They are suitable for a wide range of power applications from 1.1 VA to 36 VA, featuring Class F (155C) insulation systems and meeting stringent agency certifications.

Product Attributes

  • Brand: Signal Transformer
  • Series: ST / DST Series Split/Tran
  • Construction: Split Bobbin with Dual Cavity Platform
  • Insulation System: Class F, 155 C
  • RoHS Compliant: Yes
  • Agency Certifications: UL 1446 Class F, 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.
  • Custom Versions: Available upon request.

Technical Specifications

Part Number Secondary RMS Rating (Series) Secondary RMS Rating (Parallel) Power (VA) Primary Options Pin Configuration Dimensions (L x W x H) Inches (mm) Weight lbs (kg)
ST-2-10**# / DST-2-10**# 10 VCT @ 0.11 A 5 V @ 0.22 A 1.1 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.37 (34.9) x 1.12 (28.6) x 0.97 (24.6) 0.17 (0.08)
ST-3-10*# / DST-3-10*# 10 VCT @ 0.25 A 5 V @ 0.5 A 2.4 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.37 (34.9) x 1.12 (28.6) x 1.21 (30.8) 0.25 (0.11)
ST-4-10*# / DST-4-10*# 10 VCT @ 0.6 A 5 V @ 1.2 A 6 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.62 (41.3) x 1.31 (33.3) x 1.31 (33.3) 0.44 (0.20)
ST-5-10*# / DST-5-10*# 10 VCT @ 1.2 A 5 V @ 2.4 A 12 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.91 (48.4) x 1.59 (40.4) x 1.45 (36.9) 0.70 (0.32)
ST-6-10 / DST-6-10 10 VCT @ 2.0 A 5 V @ 4.0 A 20 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 2.25 (57.2) x 1.88 (47.8) x 1.45 (36.9) 0.80 (0.36)
ST-7-10 / DST-7-10 10 VCT @ 3.6 A 5 V @ 7.2 A 36 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 2.62 (66.7) x 2.18 (55.5) x 1.59 (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 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.37 (34.9) x 1.12 (28.6) x 0.97 (24.6) 0.17 (0.08)
ST-3-12*# / DST-3-12*# 12.6 VCT @ 0.2 A 6.3 V @ 0.4 A 2.4 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.37 (34.9) x 1.12 (28.6) x 1.21 (30.8) 0.25 (0.11)
ST-4-12*# / DST-4-12*# 12.6 VCT @ 0.5 A 6.3 V @ 1.0 A 6 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.62 (41.3) x 1.31 (33.3) x 1.31 (33.3) 0.44 (0.20)
ST-5-12*# / DST-5-12*# 12.6 VCT @ 1.0 A 6.3 V @ 2.0 A 12 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.91 (48.4) x 1.59 (40.4) x 1.45 (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 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 2.25 (57.2) x 1.88 (47.8) x 1.45 (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 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 2.62 (66.7) x 2.18 (55.5) x 1.59 (40.4) 1.1 (0.50)
ST-2-16**# / DST-2-16**# 16 VCT @ 0.07 A 8 V @ 0.14 A 1.1 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.37 (34.9) x 1.12 (28.6) x 0.97 (24.6) 0.17 (0.08)
ST-3-16*# / DST-3-16*# 16 VCT @ 0.15 A 8 V @ 0.3 A 2.4 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.37 (34.9) x 1.12 (28.6) x 1.21 (30.8) 0.25 (0.11)
ST-4-16*# / DST-4-16*# 16 VCT @ 0.4 A 8 V @ 0.8 A 6 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.62 (41.3) x 1.31 (33.3) x 1.31 (33.3) 0.44 (0.20)
ST-5-16*# / DST-5-16*# 16 VCT @ 0.8 A 8 V @ 1.6 A 12 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.91 (48.4) x 1.59 (40.4) x 1.45 (36.9) 0.70 (0.32)
ST-6-16 / DST-6-16 16 VCT @ 1.25 A 8 V @ 2.5 A 20 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 2.25 (57.2) x 1.88 (47.8) x 1.45 (36.9) 0.80 (0.36)
ST-7-16 / DST-7-16 16 VCT @ 2.25 A 8 V @ 4.5 A 36 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 2.62 (66.7) x 2.18 (55.5) x 1.59 (40.4) 1.1 (0.50)
ST-2-20**# / DST-2-20**# 20 VCT @ 0.055 A 10 V @ 0.11 A 1.1 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.37 (34.9) x 1.12 (28.6) x 0.97 (24.6) 0.17 (0.08)
ST-3-20*# / DST-3-20*# 20 VCT @ 0.12 A 10 V @ 0.24 A 2.4 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.37 (34.9) x 1.12 (28.6) x 1.21 (30.8) 0.25 (0.11)
ST-4-20*# / DST-4-20*# 20 VCT @ 0.3 A 10 V @ 0.6 A 6 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.62 (41.3) x 1.31 (33.3) x 1.31 (33.3) 0.44 (0.20)
ST-5-20*# / DST-5-20*# 20 VCT @ 0.6 A 10 V @ 1.2 A 12 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.91 (48.4) x 1.59 (40.4) x 1.45 (36.9) 0.70 (0.32)
ST-6-20 / DST-6-20 20 VCT @ 1.0 A 10 V @ 2.0 A 20 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 2.25 (57.2) x 1.88 (47.8) x 1.45 (36.9) 0.80 (0.36)
ST-7-20 / DST-7-20 20 VCT @ 1.8 A 10 V @ 3.6 A 36 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 2.62 (66.7) x 2.18 (55.5) x 1.59 (40.4) 1.1 (0.50)
ST-2-24**# / DST-2-24**# 24 VCT @ 0.045 A 12 V @ 0.09 A 1.1 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.37 (34.9) x 1.12 (28.6) x 0.97 (24.6) 0.17 (0.08)
ST-3-24*# / DST-3-24*# 24 VCT @ 0.1 A 12 V @ 0.2 A 2.4 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.37 (34.9) x 1.12 (28.6) x 1.21 (30.8) 0.25 (0.11)
ST-4-24*# / DST-4-24*# 24 VCT @ 0.25 A 12 V @ 0.5 A 6 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.62 (41.3) x 1.31 (33.3) x 1.31 (33.3) 0.44 (0.20)
ST-5-24*# / DST-5-24*# 24 VCT @ 0.5 A 12 V @ 1.0 A 12 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.91 (48.4) x 1.59 (40.4) x 1.45 (36.9) 0.70 (0.32)
ST-6-24 / DST-6-24 24 VCT @ 0.8 A 12 V @ 1.6 A 20 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 2.25 (57.2) x 1.88 (47.8) x 1.45 (36.9) 0.80 (0.36)
ST-7-24 / DST-7-24 24 VCT @ 1.5 A 12 V @ 3.0 A 36 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 2.62 (66.7) x 2.18 (55.5) x 1.59 (40.4) 1.1 (0.50)
ST-2-28 / DST-2-28 28 VCT @ 0.04 A 14 V @ 0.08 A 1.1 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.37 (34.9) x 1.12 (28.6) x 0.97 (24.6) 0.17 (0.08)
ST-3-28 / DST-3-28 28 VCT @ 0.085 A 14 V @ 0.17 A 2.4 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.37 (34.9) x 1.12 (28.6) x 1.21 (30.8) 0.25 (0.11)
ST-4-28 / DST-4-28 28 VCT @ 0.2 A 14 V @ 0.4 A 6 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.62 (41.3) x 1.31 (33.3) x 1.31 (33.3) 0.44 (0.20)
ST-5-28 / DST-5-28 28 VCT @ 0.42 A 14 V @ 0.84 A 12 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.91 (48.4) x 1.59 (40.4) x 1.45 (36.9) 0.70 (0.32)
ST-6-28 / DST-6-28 28 VCT @ 0.7 A 14 V @ 1.4 A 20 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 2.25 (57.2) x 1.88 (47.8) x 1.45 (36.9) 0.80 (0.36)
ST-7-28 / DST-7-28 28 VCT @ 1.3 A 14 V @ 2.6 A 36 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 2.62 (66.7) x 2.18 (55.5) x 1.59 (40.4) 1.1 (0.50)
ST-2-36 / DST-2-36 36 VCT @ 0.03 A 18 V @ 0.06 A 1.1 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.37 (34.9) x 1.12 (28.6) x 0.97 (24.6) 0.17 (0.08)
ST-3-36 / DST-3-36 36 VCT @ 0.065 A 18 V @ 0.13 A 2.4 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.37 (34.9) x 1.12 (28.6) x 1.21 (30.8) 0.25 (0.11)
ST-4-36 / DST-4-36 36 VCT @ 0.17 A 18 V @ 0.34 A 6 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.62 (41.3) x 1.31 (33.3) x 1.31 (33.3) 0.44 (0.20)
ST-5-36 / DST-5-36 36 VCT @ 0.35 A 18 V @ 0.7 A 12 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.91 (48.4) x 1.59 (40.4) x 1.45 (36.9) 0.70 (0.32)
ST-6-36 / DST-6-36 36 VCT @ 0.55 A 18 V @ 1.1 A 20 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 2.25 (57.2) x 1.88 (47.8) x 1.45 (36.9) 0.80 (0.36)
ST-7-36 / DST-7-36 36 VCT @ 1.0 A 18 V @ 2.0 A 36 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 2.62 (66.7) x 2.18 (55.5) x 1.59 (40.4) 1.1 (0.50)
ST-2-48 / DST-2-48 48 VCT @ 0.023 A 24 V @ 0.046 A 1.1 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.37 (34.9) x 1.12 (28.6) x 0.97 (24.6) 0.17 (0.08)
ST-3-48 / DST-3-48 48 VCT @ 0.05 A 24 V @ 0.1 A 2.4 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.37 (34.9) x 1.12 (28.6) x 1.21 (30.8) 0.25 (0.11)
ST-4-48 / DST-4-48 48 VCT @ 0.125 A 24 V @ 0.25 A 6 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.62 (41.3) x 1.31 (33.3) x 1.31 (33.3) 0.44 (0.20)
ST-5-48 / DST-5-48 48 VCT @ 0.25 A 24 V @ 0.5 A 12 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.91 (48.4) x 1.59 (40.4) x 1.45 (36.9) 0.70 (0.32)
ST-6-48 / DST-6-48 48 VCT @ 0.4 A 24 V @ 0.8 A 20 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 2.25 (57.2) x 1.88 (47.8) x 1.45 (36.9) 0.80 (0.36)
ST-7-48 / DST-7-48 48 VCT @ 0.75 A 24 V @ 1.5 A 36 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 2.62 (66.7) x 2.18 (55.5) x 1.59 (40.4) 1.1 (0.50)
ST-2-56 / DST-2-56 56 VCT @ 0.02 A 28 V @ 0.04 A 1.1 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.37 (34.9) x 1.12 (28.6) x 0.97 (24.6) 0.17 (0.08)
ST-3-56 / DST-3-56 56 VCT @ 0.045 A 28 V @ 0.09 A 2.4 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.37 (34.9) x 1.12 (28.6) x 1.21 (30.8) 0.25 (0.11)
ST-4-56 / DST-4-56 56 VCT @ 0.11 A 28 V @ 0.22 A 6 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.62 (41.3) x 1.31 (33.3) x 1.31 (33.3) 0.44 (0.20)
ST-5-56 / DST-5-56 56 VCT @ 0.22 A 28 V @ 0.44 A 12 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.91 (48.4) x 1.59 (40.4) x 1.45 (36.9) 0.70 (0.32)
ST-6-56 / DST-6-56 56 VCT @ 0.35 A 28 V @ 0.7 A 20 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 2.25 (57.2) x 1.88 (47.8) x 1.45 (36.9) 0.80 (0.36)
ST-7-56 / DST-7-56 56 VCT @ 0.65 A 28 V @ 1.3 A 36 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 2.62 (66.7) x 2.18 (55.5) x 1.59 (40.4) 1.1 (0.50)
ST-2-120 / DST-2-120 120 VCT @ 0.01 A 60 V @ 0.02 A 1.1 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.37 (34.9) x 1.12 (28.6) x 0.97 (24.6) 0.17 (0.08)
ST-3-120 / DST-3-120 120 VCT @ 0.02 A 60 V @ 0.04 A 2.4 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.37 (34.9) x 1.12 (28.6) x 1.21 (30.8) 0.25 (0.11)
ST-4-120 / DST-4-120 120 VCT @ 0.05 A 60 V @ 0.1 A 6 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.62 (41.3) x 1.31 (33.3) x 1.31 (33.3) 0.44 (0.20)
ST-5-120 / DST-5-120 120 VCT @ 0.1 A 60 V @ 0.2 A 12 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 1.91 (48.4) x 1.59 (40.4) x 1.45 (36.9) 0.70 (0.32)
ST-6-120 / DST-6-120 120 VCT @ 0.16 A 60 V @ 0.32 A 20 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 2.25 (57.2) x 1.88 (47.8) x 1.45 (36.9) 0.80 (0.36)
ST-7-120 / DST-7-120 120 VCT @ 0.3 A 60 V @ 0.6 A 36 Single 115 V / Dual 115/230 V 6 Pin (ST) / 8 Pin (DST) 2.62 (66.7) x 2.18 (55.5) x 1.59 (40.4) 1.1 (0.50)
General Specifications: Dielectric Strength - 2500 Vrms Hipot; Primary Voltage - 115 V or 115/230 V, 50/60 Hz; Electrostatic Shield - Not necessary due to split bobbin construction. Mounting Hardware - see chart. Size 7 has 4 mounting holes on 2.18 x 1.75 centers for #6 screws.

Note: Part numbers marked with (*) or (**) or (#) indicate Class 2 compliance. See CSA certification details for Inherently Limited and Non Inherently Limited classifications.

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 screws and nuts (ST-MS, ST-MN) are available from Signal. Refer to Accessories datasheet for mounting screw information.


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Company Changsha Purple Horn E-Commerce Co., Ltd.
Location 2332 Kaibin Commercial Plaza, No. 419 Shaoshan Middle Road, Shazitang Street, Yuhua District, Changsha City, Hunan Province
Contact Person Sellina

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