Low Frequency Transformers - Low Frequency Inductors - Low Frequency Chokes

By: Standex Electronics  09-12-2011
Keywords: Transformers

Standex offers a full line of low frequency transformers, inductors and chokes in standard and custom designs. We have products to fit most needs in the 50/60Hz to 40Hz range. Most of these products are UL/CSA recognized or are designed to meet UL/ CSA/VDE requirements - with other agency approvals gained as needed. Our unsurpassed in-house capabilities (stamping, molding, winding and termination) mean we can tailor a standard product or start from scratch with a new design.

Products available:

  • Class 2 transformers, wired, in plastic casing
  • Chokes mounted in L bracket or channel frame
  • Toroidal common mode chokes
  • PC mount current transformers
  • Class 2 energy limiting wall plug, wired, cord connected or PC mounted transformers
  • Autotransformers in open, enclosed or toroidal designs
  • Control circuit transformers
  • And more

Design Guide Check List

Power Transformer design guide, rectifier circuit calculations, and check list

Class 2 Design Info

Class 2 transformer design information

CA Series

Fully Certified Class 2 Transformers - Wired in (plastic)

  • Highly isolated case requires no extra grounding
  • Rugged, high impact resistant encosure
  • Combination screw / .25" male quick connect secondary terminals
  • Intergal 1/2" conduit nipple mounting
  • Optional panel mount bracket available
  • Fuse-less energy limiting winding
  • CSA and UL approved models available
  • Custom sizes, ratings and terminations may be engineered for your specific application

CHB Series

Choke - 'L' bracket mounted

  • Inductance to 100 Micro Henries - current to 50 Amps
  • Termination via screw terminals
  • CSA certified LR 16597-50 for designs up to 70 Amps and 600 Volts
  • Custom sizes, ratings and terminations may be engineered for your specific application

CHC Series

Choke - channel frame mounted

  • Inductance to 30 Henries - Current to 10 Amps
  • Termination via 8" leads - other lead lengths optional
  • CSA certified LR 16597-50 for designs up to 70 Amps and 600 Volts
  • Custom sizes, ratings and terminations may be engineered for your specific application

CM series

Toroidal Common Mode Choke

  • CM series common mode chokes are designed for common mode noise up to 30 MHz on A.C. and D.C line
  • Available configured vertically or horizontally, with or without a base
  • Inductances available to 15 MilliHenries
  • Current carrying capability available to 40 Amps
  • Custom sizes, ratings and terminations may be engineered for your specific application

CSB Series

Current Transformer - PC mount

  • Primary and Secondary windings are PC board integrated - no need for the customer to install the primary winding separately as is usually required in toroidal designs
  • Low cost compact package design
  • Varnish impregnated to reduce audible noise
  • Plastic bobbin meets the UL 94 flamability requirement
  • Custom sizes, ratings and terminations may be engineered for your specific application

FPS Series

Class 2 energy-limiting wall plug transformer

  • Output voltage limited to meet the requirements for connection to Class 2 circuits as defined in the Electrical Code
  • Plugs into any North American standard duplex receptacle
  • CSA (NRTL/C) certified to C22.2 No. 223-M91 and UL 1310
  • Rugged, high-impact, flame retardant thermoplastic enclosure
  • Secondary screw terminals are hidden and protected from accidental shorting
  • Also available with flexible secondary line cord and jacks for special applications
  • The fail-safe protection designed into the transformer allows the use of lightweight, unprotected "bell" wiring in applications such as door chimes, buzzers, intercoms, security devices, thermostats, central vacuum systems, low voltage lighting control, remote control, etc.

FPT Series

Toroidal Power Transformer

  • 44 Standard models from 15VA to 500 VA
  • Dual115/230V 50/60Hz rated primary
  • Dual secondaries for series or parallel selection
  • Class B 130°C. Insulation system utilized
  • Low radiated magnetic field
  • CSA and UL recognized components LR16597, E105782
  • Dielectric tested to UL/CSA standards
  • Custom sizes, ratings and terminations may be engineered for your specific application
  • ATC-Frost UL / CSA family recognition assures fast, trouble free approval of your equipment
  • Toroidal designs are typically 50% lighter and much more compact than traditional EI laminated transformers
  • Custom toroid transformer dimensions may be varied to accommodate alternate dimensional requirements such as low profile or slim line equipment
  • Low stray magnetic fields compared to traditional EI laminated transformers
  • Low noise - toroidal construction ensures that mechanical 'hum" will be minimal

FTA Series

Class 2 energy-limiting cord connected transformer

  • Output voltage limited to meet the requirements for connection to Class 2 circuits as defined in the Electrical Code
  • CSA (NRTL/C) certified to C22.2 No. 223-M91 and UL 1310

FTC-FTD-FTK Series

Class 2 energy-limiting wired in transformer

  • Rugged all steel construction provides excellent heat dissipation and electromagnetic shielding
  • Fully threaded steel conduit nipple provides strong positive mounting
  • Secondary wiring terminals available in combination screw / .25" male quick connects
  • Vacuum varnish impregnated and oven baked to insure quiet trouble free operation
  • Most models are Custom sizes, ratings and terminations may be engineered for your specific application

FTP Series

Class 2 transformers, Printed Circuit Mounted

  • 2.5VA to 50 VA
  • Dual primary voltage 115/230V 50/60 Hz
  • 400 VRMS dielectric strength tested
  • Bobbins and shroud meet UL94 VO rating
  • Most models use energy limiting fuseless design
  • Split/Dual bobbin construction provides for low capacitive coupling, minimizing noise
  • No electrostatic shield necessary
  • High isolation primary to secondary
  • designed to meet CSA C22.2 No. 66 and UL1585
  • Custom Sizes, ratings and terminations may be engineered for your specific application

TA TAE FPT Series

Autotransformers, Open, Enclosed and Toroid

  • Economical method of changing voltage levels
  • Widely used to operate electrical equipment outside of North America
  • Typically 50% smaller than similar isolation transfomers
  • All models are 50/60Hz, 230V-115V or 115V -230V
  • Laminated units are varnished impregnated for quiet operation
  • 10" leads standard
  • Some models CSA / UL recognized LR16597, E105782
  • Class B - 130°C. insulation system utilized
  • Dielectric standards to CSA/UL standards
  • Custom sizes, ratings and terminations may be engineered for your specific application

TAP Series

Audio Matching telecommunications transformers. PC board mounted

  • Economical open P.C. Frame mounting
  • bifilar wound for capacitive and resistive balance
  • Frequency response 200Hz to 15KHz
  • Insertion loss less than 1.5 dB
  • Dielectric tested for 250 VRMS
  • Custom epoxy cast unit available
  • Custom Sizes, ratings and terminations may be engineered for your specific application

TC Series

Control Circuit Transformers - Bracket Mount

  • Traditional heavy duty four point bracket mounting
  • Binding head screw terminals
  • UL CSA recognized - LR 16597, E105782
  • Multiple primary and secondary voltage combinations available
  • Varnish impregnated and baked for quiet operation
  • Custom Sizes, ratings and terminations may be engineered for your specific application

TCC-TCK Series

Control Circuit Power Transformers - Channel frame mounted

  • The most economical transformer style that provides voltage changes from distribution to control levels, and have isolated primary and secondary windings
  • UL CSA recognized - LR 16597, E105782
  • Class B - 130°C. Insulation system utilized
  • 8" to 10" flexible leads standard, custom terminations available
  • Custom Sizes, ratings and terminations may be engineered for your specific application

TCE Series

Control Circuit Transformers - Enclosed mounting

  • Enclosed to allow mounting of control circuit transformers outside of any other electrical enclosure and for coil protection
  • Access knockouts for cable are integrally provided
  • Attractive ASA61 grey enamel cover
  • Size reduced enclosures available
  • Fully varnish impregnated for quite operation
  • CSA-NRTL/C certified KR16597
  • ULrecognized to 500VA,E105782
  • 100VA to 1000VA
  • Custom Sizes, ratings and terminations may be engineered for your specific application

TLE TLB FPT Series

Low Voltage Lighting Transformers

  • General Purpose Low voltage Transformers with secondary protection and double insulation
  • Suitable for low voltage lighting circuits
  • Dialectric strength tested to CSA/Ulf Standards
  • Enclosed models include secondary circuit protection
  • Toroid models supplied with necessary mounting hardware
  • Custom Sizes, ratings and terminations may be engineered for your specific application
  • Some models CSA certified to TIL-B45 as suitable for use with "Trapeze lighting systems"

TRB Series

Low voltage rectifier transformers - chassis mounted - open style

  • CSA certified LR 16597
  • UL recognized E105782
  • Insulated 10" TEW Primary and Secondary leads
  • Secondary winding center tapped
  • Custom Sizes, ratings and terminations may be engineered for your specific application

TRC Series

Low voltage rectifier transformers - chassis mounted - open style

  • CSA certified LR 16597
  • UL recognized E105782
  • Conservative Class A operation
  • Economical channel frame mounting
  • Split/Dual bobbin operation
  • All secondaries center tapped Class B - 130°C. insulation system used
  • Custom Sizes, ratings and terminations may be engineered for your specific application

TRPI Series

Low voltage rectifier transformers - printed circuit mounted

  • 2.5VA to 56VA
  • 4000VRMS isolation primary and secondary
  • Industry standard P.C. board layout
  • Dual primary/secondary windings for series/parallel operation
  • CSA/UL recognized components
  • Custom sizes, ratings and terminations may be engineered for your specific application

TRPL Series

Power transformers - printed circuit mounted

  • Dual Primaries 115/230V, 50/60Hz
  • 2.5VA to48 VA
  • Industry Standard P.C. pin layout
  • CSA Certified LR 16597; UL recognized E105782
  • Low inter-winding capacitance due to separated windings
  • No electro-static shield required due to separated windings
  • Ideal for solid state control and instrumentation as well as sing or dual output D.C. supplies
  • Custom sizes, ratings and terminations may be engineered for your specific application

TRCI - TRBI

Low Voltage Rectifier Transformers - bracket mounted

  • CSA certified LR15697
  • UL recognized E107872
  • Class B - 130°C. Insulation system
  • Designed to meet international standards
  • Dual primary and secondary windings
  • High isolation dual bobbin construction
  • 4000 V RMS dielectric tested
  • UL 94VO rated bobbin
  • 25VA to 175VA
  • Custom sizes, ratings and terminations may be engineered for your specific application

TRCQ Series

Low Voltage Rectifier Transformers - Channel Mount - open style with terminals

  • Combination - Solder or Quick Connect terminals
  • Split bobbin construction provides for high isolation primary to secondary
  • Split bobbin construction provides low capacitive to minimize line noise
  • Split bobbin construction makes no electrostatic shield necessary
  • Center tapped secondary winding
  • CSA certified LR15697
  • UL recognized E107872
  • Class B - 130°C. Insulation system
  • Custom sizes, ratings and terminations may be engineered for your specific application

TRE Series

Low Voltage Rectifier Transformers - bracket mounted enclosed style

  • CSA certified LR 16597
  • UL recognized E105782
  • Insulated 10" TEW Primary and Secondary leads
  • Secondary winding center tapped
  • Custom sizes, ratings and terminations may be engineered for your specific application

TRL Series

Low Profile Transformer - core mounted - horizontal

  • Height saving low profile core mounted construction
  • In chassis or on chassis mounting
  • Dual primary 125/230V 50/60 Hz
  • Color coded flexible wire leads
  • CSA certified LR15697
  • UL recognized E107872
  • Custom sizes, ratings and terminations may be engineered for your specific application

TRP-TRPD Series

Low voltage rectifier transformers -printed circuit mounted - vertical

  • .5VA to 24VA
  • CSA and UL recognized LR16597, E105782
  • Single or Dual primary voltages
  • 6 Pin 230 Volt 50/60Hz also available
  • TRP series is 6 pin and TRPD series is 8 pin
  • Class B - 130°C. Insulation system
  • Custom sizes, ratings and terminations may be engineered for your specific application

TRPH Series

Horizontal split bobbin Power Transformers - Printed circuit board mount

  • Split bobbin construction provides for high isolation primary to secondary
  • Split bobbin construction provides low capacitive to minimize line noise
  • Split bobbin construction makes no electrostatic shield necessary
  • Single 115V or Dual 115/230V primaries
  • Split secondaries allow series, parallel or dual operation
  • CSA certified LR15697
  • UL recognized E107872
  • Class B - 130°C. Insulation system
  • Custom Sizes, ratings and terminations may be engineered for your specific application

400 Hz Power Xfmers. 1.5 VA to 9 VA

400 Hz Power Transformers, 1.5 VA to 9 VA

  • Miniature Encapsulated Toroidal 400 Hz Power Transformers
  • Designed to meet the requirements of Pil-PRF-27/37 through /47
  • 308 standard designs from 1.5VA through 25 VA
  • A wide variety of output voltages offer maximum diesign flexibility

400 Hz Power Xfrmers, 16 - 25 VA

400 Hz Power Transformers, 16 - 25 VA

  • Miniature Encapsulated Toroidal 400 Hz Power Transformers
  • Designed to meet the requirements of Pil-PRF-27/37 through /47
  • 308 standard designs from 1.5VA through 25 VA
  • A wide variety of output voltages offer maximum diesign flexibility

Keywords: Transformers

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