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Talema Toroidal Transformer Series Guide

Talema designs and manufactures an extensive range of 50/60 Hz toroidal transformers. In this article, we will discuss each of the main series in the Talema catalog to help you make the best selection for your application. Each series is designed with specific characteristics to suit a wide range of applications.

Toroidal transformers offer many desirable characteristics, such as low noise, low stray-field, smaller size, reduced weight, and higher efficiency, which may be required or desirable in many products. Unique design and mounting options determine these characteristics in each series.

Across our standard range, we use grain-oriented silicon steel (GOSS) cores. All GOSS cores are manufactured and annealed in-house.

All parts are manufactured using UL/CSA listed materials and are fully RoHS and REACH compliant.

Low Profile PCB Mountable Transformers

Talema PCB Mounting Toroidal Transformers
Lo-Pro-PCB-Schematic

Power Ratings: 1.6 to 50 VA
Working Voltages: Dual Primary: 2 × 115 V (70000K series) or 2 × 120 V (72400K series); Dual Secondary: 7 V to 22 V
Insulation Class: A (105 °C)
Mounting: Encapsulated in plastic case
Approvals: UL 62368-1, IEC 62368-1, UL5085

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High Power PCB Mountable Transformers

PCB Mounting toroidal transformers 35VA to 160VA
Hi-Power-PCB-Open-Schematic

Power Ratings: 35 to 160 VA
Working Voltages: Single Primary : 115V (64XXK) or 230V (65XXK) Dual Secondary : 7V to 30V
Insulation Class: A (105 °C)
Mounting: Encapsulated in plastic case
Approvals: EN61558, UL5085

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Miniature Open Style Toroidal Transformers

Photo miniature Open style toroidal transformer 60032
Mini-Open-Schematic

Power Ratings: 1.6 to 50 VA
Working Voltages: Primary : 0-115-230V (600XX) or 230V (610XX) or Dual 115V (620XX) Dual Secondary : 7V to 22V
Insulation Class: A (105 °C)
Mounting: Center potted with drilled hole
Approvals: EN61558; Recognized to UL5085

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Encapsulated Toroidal Transformers

Encapsulated Toroidal Transformer 120VA 230V Primary, 2x25V secondary
Open-Encapsulated-Schematic

Power Ratings: 15 to 500 VA
Working Voltages: Primary: 230 V or Dual 2 × 115 V; Dual Secondary: 6 V to 55 V
Insulation Class: A (105 °C)
Mounting: Encapsulated in plastic case
Approvals: EN61558; Recognized to UL5085

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Open Style Toroidal Transformers

Open-Style-Toroidal-Transformers
Open-Encapsulated-Schematic

Power Ratings: 15 to 1000 VA
Working Voltages: Primary: 230 V or dual 115 V; dual secondary: 6 V to 55 V
Insulation Class: A (105 °C)
Mounting: Open style supplied with mounting kits (bolt, nut, and washer)
Approvals: EN61558, IEC61558; Recognised to UL5085-1

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Open Style Toroidal Transformers (55000 series)

Toroidal transformers Open and Centre-potted 55000
Hi-Power-PCB-Open-Schematic

Power Ratings: 15 to 1000 VA
Working Voltages: Primary: 230 V; Dual secondary: 12 V to 55 V
Insulation Class: A (105 °C)
Mounting: Open style supplied with mounting kits (or) center potted with drilled hole
Approvals: EN61558, IEC61558; Recognised to UL5085-1

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Open Style Toroidal Transformers (58000 series)

Hi-Power-PCB-Open-Schematic

Power Ratings: 12 to 800 VA
Working Voltages: Primary: 230 V; Secondary: 12 V to 230 V
Insulation Class: A (105 °C)
Mounting: Open style supplied with mounting kits (or) center potted with drilled hole (or) center potted with threaded insert (or) DIN rail mounting bracket
Approvals: EN61558, IEC61558; Recognised to UL5085-1

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Control Panel Toroidal Transformers (SFB series)

Control Panel SFB transformer
Control-Panel-Schematic

Power Ratings: 75 to 500 VA
Working Voltages: Primary: 230 V or 400 V; Center tapped secondary: 12 V – 0 – 12 V to 55 V – 0 – 55 V
Insulation Class: A (105 °C)
Mounting: L-shaped brackets with touch-proof terminals. Ideal for control panels.
Approvals: EN61558, IEC61558; Recognised to UL5085-1

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Medical Grade Isolation Transformers

MD Series Medical Grade toroidal transformer 600VA
Medical-Schematic

Power Ratings: 50 to 3000 VA
Working Voltages: Dual primary: 0 – 100 V – 120 V (universal working voltage); dual secondary: 120 V
Insulation Class: B (130 °C)
Mounting: Center potted with drilled hole and additional rubber disc. Ideal for medical isolation units/assembly.
Approvals: Approved to UL60601-1

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Customized Toroidal Transformers

Talema’s engineering team has decades of experience designing custom toroidal transformers for all kinds of unique and challenging applications. Below are some of the parameters that can be customized, but feel free to contact us if you have questions about a specific application.

General Purpose Transformers
  • Isolation transformers up to 7.5 KVA
  • Autotransformers up to 25 KVA
  • Maximum primary and secondary voltage 600 V for UL approval
  • Maximum primary voltage 440 V for EN/IEC approval
  • Maximum secondary voltage 250 V for EN/IEC approval
Transformers for Medical and Dental Equipment
  • Isolation transformers up to 15 KVA
  • Autotransformers up to 40 KVA
  • Maximum primary and Secondary voltage 600 V for UL approval
Customization options
  • Electrical: Wide input/output specifications, efficiency, class of insulation, duty cycle, DC output, low magnetizing inrush, overload and short-circuit protections, etc.
  • Physical dimensions: Specific diameter and height, extremely flat in dimensions
  • Mounting style: Open, encapsulated, centre potted, captive inserts, DIN rail mounting, PCB mounting, lifting hooks/eyebolts, special mounting plates, etc.
  • Connections: Special cables, sleeving, lead lengths, leads twisting, connectors, etc.

Product Safety Approvals

Talema has invested considerable time and effort to obtain “family approvals” enabling automatic recognition of custom transformers without having to send each new design to a certified test facility for approval, saving the customer both time and money. Our catalog contains UL-recognized components, DEKRA approvals to European standards, and IEC CB certificates for worldwide approvals.

Learn more here: Talema Product Approvals

UL Approvals
  • UL1446 Insulation Systems with Temperature Classes B and F
  • UL5085-1 — General Purpose Transformers
  • UL60601-1 — Transformers for Medical and Dental Equipment
  • UL62368-1 — Audio/video, information and communication technology equipment
EN Approvals
  • EN61558-1, EN61558-2-6 — Safety Isolating Transformers
  • EN61558-1, EN61558-2-4 — Isolating Transformers
  • EN60950-1 — Print Transformers
IEC Approvals
  • IEC61558-1, IEC61558-2-6 — Safety Isolating Transformers
  • IEC61558-1, IEC61558-2-4 — Isolating Transformers
  • IEC62368-1 — Audio/video, information and communication technology equipment
General
  • CE Marked
  • RoHS & REACH Complaint
  • ISO 9001:2015 — Quality Management System
  • ISO 14001:2015 — Environmental Management System

Author

  • Yoganand Velayutham is a Design and Development Engineer with Talema India. He holds a Master’s degree in Electrical and Electronics Engineering from Anna University, Chennai. He has been associated with Talema from 2006-2008 and since 2010.

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