Three-phase transformers are nowadays mainly designed as three-leg cores with arrangement in one plane. We distinguish:
3-Phase Transformers of the 3UI core type series
Transformers of the type series 3UI are manufactured with power ratings from approx. 10VA to 25kVA. Construction methods of these transformers are:
- vertical construction with foot angle
- horizontal construction with brackets or spacers
3 Phase Power Transformers type series DTN
Transformers of type series DTN with power ratings from 30 to 180kVA. For adequate cooling, these transformers should generally be set up with the winding axis vertical.
3-Phase Print Transformers for printed circuit boards
Transformers of type series 3UI30, 3UI39 and 3UI48 are manufactured as so-called potted 3-phase flat transformers with power ratings from approx. 15 to 45VA.
Choose Your Ambient Temperature
In the following you will find type overviews, which give an orientation about the mechanical dimensions of the required transformer for your electrical power requirement. For this correlation between mechanics and electrics, the ambient temperature of the transformers is an essential boundary condition. Choose from the common ambient temperatures ta40, ta50, and ta70 to find the one that suits you best.
We will be pleased to calculate YOUR individual transformer for the appropriate environment.
Possible mechanical designs for 3-phase transformers at ta = 40°C:
The type ratings given are for initial orientation. The output power achievable with a specific core type must be determined individually for each product. It depends on a number of boundary conditions such as ambient temperature, maximum permitted component temperature, core material, operating mode, cooling situation, number of output windings, insulation requirements (type of transformer), etc.
BREMER 3411-en – 3-phase transformers 95 to 950VA, vertical with transformer terminals
| These low-cost “small three-phase transformers” have a moderate thermal design in insulation class B. From type 3UI75 with loss-reduced laminated core. |
BREMER 3412-en – 3-phase transformers 250VA to 8kVA, vertical with terminal block on head bracket
| Easy-to-assemble long foot brackets; all types with loss-reduced laminated core; from 3UI120/75 also in insulation class F. |
BREMER 3414-en – 3-phase power transformers 7,5 bis 25kVA, grain-oriented core laminations; vertical
| The “big ones” in insulation class F for highest output powers; terminal block on bracket, eyebolts, vertical mounting position. |
BREMER 3430-en – 3-phase transformers 40 to 950VA in horizontal construction with spacers
| Compact construction for units that allow screwing through from the back of the mounting plate. Space-saving, with free ends or solder lugs. |
BREMER 3431-en – 3-phase transformers 95 bis 950VA in horizontal construction with spacers
| Compact construction for units that allow screwing through from the back of the mounting plate; connections with transformer terminals; |
BREMER 3432-en – 3-phase transformers 250VA bis 8kVA, horizontal with mounting brackets; terminal block
| All types with loss-reduced laminated core; from 3UI120/75 also in insulation class F. Two variants for terminal arrangement. |
BREMER 3434-en – 3-phase power transformers 7,5 to 25kVA, grain-oriented core laminations; with mounting brackets for mounting on vertical panels
| Mounting position with vertical magnetic axis for cooling by convection. |
BREMER 3450-en – Individual high power 3-phase transformers over 25kVA; insulation class F or H
We manufacture individual three-phase transformers up to a total weight of approx. 600kg. The electrical design, the mechanical construction and the design of the connections are made according to customer requirements. If required, matching housings in standard or customer color are available.
Possible mechanical designs for 3-phase transformers at ta = 50°C:
The type ratings given are for initial orientation. The output power achievable with a specific core type must be determined individually for each product. It depends on a number of boundary conditions such as ambient temperature, maximum permitted component temperature, core material, operating mode, cooling situation, number of output windings, insulation requirements (type of transformer), etc.
BREMER 3511-en – 3-phase transformers 90VA to 900VA, vertical with transformer terminals
| These low-cost “small three-phase transformers” have a moderate thermal design in insulation class B. From type 3UI75 with loss-reduced laminated core. |
BREMER 3512-en – 3-phase transformers 230VA to 7,2kVA, vertical with terminal block on head bracket
| Easy-to-assemble long foot brackets; all types with loss-reduced laminated core; from 3UI120/75 also in insulation class F. |
BREMER 3514-en – 3-phase power transformers 7,3 to 22kVA, grain-oriented core laminations; vertical
| The “big ones” in insulation class F for highest output powers; terminal block on bracket, eyebolts, vertical mounting position. |
BREMER 3530-en – 3-phase transformers 35 to 900VA in horizontal construction with spacers
| Compact construction for units that allow screwing through from the back of the mounting plate. Space-saving, with free ends or solder lugs. |
BREMER 3531-en – 3-phase transformers 90 to 900VA in horizontal construction with spacers
| Compact construction for units that allow screwing through from the back of the mounting plate; connections with transformer terminals. |
BREMER 3532-en – 3-phase transformers 230VA to 7,2kVA, horizontal with mounting brackets; terminal block
| All types with loss-reduced laminated core; from 3UI120/75 also in insulation class F. Two variants for terminal arrangement. |
BREMER 3534-en – 3-phase power transformers 7,3 to 22kVA, grain-oriented core laminations; with mounting brackets for mounting on vertical panels
| Mounting position with vertical magnetic axis for cooling by convection. |
Possible mechanical designs for 3-phase transformers at ta = 70°C:
The type ratings given are for initial orientation. The output power achievable with a specific core type must be determined individually for each product. It depends on a number of boundary conditions such as ambient temperature, maximum permitted component temperature, core material, operating mode, cooling situation, number of output windings, insulation requirements (type of transformer), etc.
BREMER 3711-en – 3-phase transformers 60 to 600VA, vertical with transformer terminals
| These low-cost “small three-phase transformers” have a moderate thermal design in insulation class B. From type 3UI75 with loss-reduced laminated core. |
BREMER 3712-en – 3-phase transformers 160VA to 5,4kVA, vertical with terminal block on head bracket
| Easy-to-assemble long foot brackets; all types with loss-reduced laminated core; from 3UI120/75 also in insulation class F. |
BREMER 3714-en – 3-phase power transformers 5,8 to 17kVA, grain-oriented core laminations; vertical
| The “big ones” in insulation class F for highest output powers; terminal block on bracket, eyebolts, vertical mounting position. |
BREMER 3730-en – 3-phase transformers 25 to 600VA in horizontal construction with spacers
| Compact construction for units that allow screwing through from the back of the mounting plate. Space-saving, with free ends or solder lugs.
|
BREMER 3731-en – 3-phase transformers 60 to 600VA in horizontal construction with spacers
| Compact construction for units that allow screwing through from the back of the mounting plate; connections with transformer terminals. |
BREMER 3732-en – 3-phase transformers 160VA to 5,4kVA, horizontal with mounting brackets; terminal block
| All types with loss-reduced laminated core; from 3UI120/75 also in insulation class F. Two variants for terminal arrangement. |
BREMER 3734-en – 3-phase power transformers 5,8 bis 17kVA, grain-oriented core laminations; with mounting brackets for mounting on vertical panels
| Mounting position with vertical magnetic axis for cooling by convection. |
Your technical contact for transformers
For product-specific questions, please contact Mr. Thomas Bremer. Together we can clarify the last open questions regarding your enquiry.
Dipl.-Ing. Thomas Bremer: 03378 2006-0
E-mail: thomas.bremer@bremer-trafo.de