Type series EI
Transformers of the EI type series have a basic cubic shape. They are economical and are manufactured up to power ratings of approx. 650VA.
The majority of PCB transformers are encapsulated EI types.
Type series UI
Transformers of the UI type series are also named “core transformers” – in contrast to so-called “shell transformers”. They have a flat basic shape and can be recognized by the two windings. They are manufactured with standard laminations up to power ratings of approx. 20kVA.
For printed circuit boards, UI transformers are available as so-called flat transformers with power ratings of approx. 10 to 30VA.
Type series M
Transformers of the type series M offer some technical advantages for special transformers, but are not very common for economic reasons.
Small transformers
Almost all BREMER transformers are designated as small transformers and as dry transformers in the relevant standards. We refer to their basic mechanical structures as “vertical” if they are fitted with foot angles. We name the versions with spacer bolts or foot brackets “horizontal”.
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 1-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 1401-en – “EI” transformers 20 to 650VA in standard construction, vertical
| This core type series is moderately designed and contains preferred types that can be supplied at short notice and are particularly economical. |
BREMER 1402-en – “EI” transformers 20 to 650VA in standard construction, vertical with 2 terminal strips
| The economical type series “EI” with 2nd terminal strip for more than two connections and generous distance between input and output. |
BREMER 1405-en – Small, encapsulated transformers 15 to 40VA with flat plugs or other connections; optionally with mounting rail fastening
| These transformers are fully encapsulated in protection class II without protective earth conductor. |
BREMER 1411-en – “UI”-transformers 150 to 550VA, vertical with transformer terminal
| Our small, flat UI transformers with low-cost terminals. |
BREMER 1412-en – “UI”-transformers 150VA to 11kVA, vertical with terminal block on head bracket
| Easy-to-assemble long base brackets; from UI120 with loss-reduced laminated core; from UI120/75 also in insulation class F. |
BREMER 1413-en – “UI”-transformers 150VA bis 11kVA, vertical with pre-mounted terminal blocks for reduced overall height
| Terminal arrangement with wire entry from above; from UI120 with loss-reduced laminated core; from UI120/75 also in insulation class F. |
BREMER 1414-en – 1-phase-power transformers 5 to 20kVA, 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 1420-en – “EI” transformers 4 to 650VA 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 1430-en – “UI”-transformers 6 to 550VA 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 1431-en – “UI”-transformers 150 to 550VA 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 1432-en – “UI”-transformers 150VA to 11kVA, horizontal with mounting brackets; terminal block
| Also with free ends; compact and flat; suitable for switch cabinet rear walls or large 19-inch racks; mounting position from type UI180 by agreement. |
BREMER 1434-en – 1-phase-power transformers 5 to 20kVA, grain-oriented core laminations; with mounting brackets for mounting on vertical panels
| Mounting position with vertical magnetic axis for cooling by convection. |
BREMER 1440-en – Type series MT20 with approx. 300 to 1500VA; special transformers vertical
| This type series with enlarged winding space is suitable for high-voltage or high-current transformers as well as high insulation voltages. |
BREMER 1441-en – Type series M- and MD-Classic with 30 to 130VA; special transformers, vertical or horizontal
| The formerly widely used M core laminations are now difficult to obtain. They are still popular for high-quality audio equipment. |
BREMER 1450-en – Individual high power 1-phase transformer over 20kVA; insulation class F or H
We manufacture individual single-phase transformers up to a total weight of approx. 500kg. The electrical design, the mechanical construction and the design of the connections are made according to customer requirements. If required, matching enclosures in standard or customer colours are available.
Possible mechanical designs for 1-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 1501-en – “EI” transformers 18 to 550VA in standard construction, vertical
| This core type series is moderately designed and contains preferred types that can be supplied at short notice and are particularly economical. |
BREMER 1502-en – “EI” transformers 18 to 550VA in standard construction, vertical with 2 terminal strips
| The economical type series “EI” with 2nd terminal strip for more than two connections and generous distance between input and output. |
BREMER 1505-en – Small, encapsulated transformers 14 to 37VA with flat plugs or other connections; optionally with mounting rail fastening
| These transformers are fully encapsulated in protection class II without protective earth conductor. |
BREMER 1511-en – “UI”-transformers 130 to 500VA, vertical with transformer terminals
| Our small, flat UI transformers with low cost terminals.
|
BREMER 1512-en – “UI”-transformers 130VA to 10kVA, vertical with terminal block on head bracket
| Easy-to-assemble long base brackets; from UI120 with loss-reduced laminated core; from UI120/75 also in insulation class F. |
BREMER 1513-en – “UI”-transformers 130VA to 10kVA, vertical with pre-mounted terminal blocks for reduced overall height
| Terminal arrangement with wire entry from above; from UI120 with loss-reduced laminated core; from UI120/75 also in insulation class F. |
BREMER 1514-en – 1-phase-power transformers 5 to 18kVA, 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 1520-en – “EI” transformers 4 to 550VA 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 1530-en – “UI”-transformers 6 to 500VA 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 1531-en – “UI”-transformers 130 to 500VA 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 1532-en – “UI”-transformers 130VA to 10kVA , horizontal with mounting brackets; terminal block
| Also with free ends; compact and flat; suitable for switch cabinet rear walls or large 19-inch racks; mounting position from type UI180 by agreement. |
BREMER 1534-en – 1-phase-power transformers 5 to 18kVA , 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 1-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 1701-en – “EI” transformers 12 to 65VA in standard construction, vertical
| For very high ambient temperatures with appropriately reduced output power. |
BREMER 1702-en – “EI” transformers 12 to 65VA in standard construction, vertical with 2 terminal strips
| For very high ambient temperatures with appropriately reduced output power. |
BREMER 1705-en – Small, encapsulated transformers 10 to 20VA with flat plugs or other connections; optionally with mounting rail fastening
|
BREMER 1711-en – “UI”-transformers 90 to 300VA, vertical with transformer terminals
| Our small, flat UI transformers with low-cost terminals. Also economical for high ambient temperatures in insulation class B. |
BREMER 1714-en – 1-phase-power transformers 4 to 12kVA, 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 1720-en – “EI” transformers 4 to 65VA 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 1730-en – “UI”-transformers 4 bis 300VA 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 1731-en – “UI”-transformers 90 to 300VA in horizontal construction with spacers
| Compact construction for units that allow screwing through from the back of the mounting plate; connections with transformer terminals. |
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