Isolating Transformers

Function
Isolation transformers are used in systems where effective voltage separation between circuits is essential. They provide protective separation of the primary and secondary windings, significantly increasing the operational safety of the installation and connected equipment. The separation of windings is achieved by using a split bobbin or an electrostatic shield, which additionally limits the transfer of disturbances and improves power quality.

In the standard version, transformers are designed for mounting on a base welded to the core or by means of bolted mounting brackets. The number of taps can be adjusted upon agreement with the customer, as well as the arrangement of current terminals on one or both sides of the unit. Upon request, enclosures with protection degree IP23, IP44 or IP54 are available, with the possibility of cable entry through cable glands, which further increases environmental resistance and facilitates integration with the installation.

Benefits

Enhanced electrical safety due to full circuit separation
Protection of connected equipment against overvoltages, disturbances and damage
Minimization of short-circuit and failure risks in low-voltage systems
Ease of servicing and testing thanks to clear design and simple access to terminals
Configurable number of taps, enclosure type and mounting method

Applications

Railway industry
Marine industry
Power quality systems
Oil & gas industry
Heavy and mining industry
Renewable energy sources
Power electronics and drive systems

Custom Design

Manufacturing a transformer with parameters other than those specified in the catalogue is possible upon prior consultation. The manufacturer reserves the right to introduce changes resulting from the continuous development of its products. The transformer can also be manufactured in a different version upon prior agreement.

Download catalogue cards

1-phase up to 2,5kVA 1-phase up to 100kVA 3-phase up to 40kVA

Product code

Details:

Design	Isolating transformers produced in accordance with requirements of EN/IEC 61558-2-4
Insulation class	B(130^oC) - standard up to 5 kVA; F(155^oC) - standard above 5 kVA
Climatic class /environmental class	C1/E0 - land design; C2/E1 - maritime design
Ambient temperature	40^oC
Protection degree	IP 00
Protection class	I
Frequency	50/60 Hz
Vector group	Dyn5 - standard
Primary voltage	up to 1000 V
Secondary voltage	up to 500 V
Terminals	screw terminal blocks with the cross section from from 4 mm² up to 150 mm² or copper bus bars
Fastening	by means of angles

Technical sketch

Design A for the power up to 5 kVA

Design B for the power above 5 kVA

Dimension table

Technical data of three-phase isolating transformers ET3o **

Type	Power [kVA]	L [mm]	B_max [mm]	H [mm]	d [mm]	e [mm]	f [mm]	Weight [kg]	Design
ET3o_* - 0,05	0,05	100	60	122	81	41	5 x 8	1,4	A
ET3o_* - 0,15	0,15	125	71	140	100	55	5 x 8	2,6	A
ET3o_* - 0,3	0,3	155	91	156	130	71	8 x 12	5,1	A
ET3o_* - 0,5	0,5	195	102	185	173	82	8 x 11	7,5	A
ET3o_* - 0,63	0,63	195	112	185	173	92	8 x 11	9,5	A
ET3o_* - 0,8	0,8	195	112	185	173	92	8 x 11	10,5	A
ET3o_* - 1,0	1,0	210	105	200	173	85	8 x 11	12	A
ET3o_* - 1,5	1,5	240	131	226	198	105	11 x 15	16	A
ET3o_* - 2,0	2,0	240	146	226	198	120	11 x 15	22	A
ET3o_* - 2,5	2,5	261	140	239	198	114	11 x 15	26	A
ET3o_* - 3,0	3,0	300	152	274	240	122	11 x 15	30	A
ET3o_* - 4,0	4,0	300	165	274	240	135	11 x 15	38	A
ET3o_* - 5,0	5,0	300	192	274	240	160	11 x 15	49	A
ET3o_* - 6,3	6,3	360	230	365	310	125	11 x 15	47	B
ET3o_* - 7,5	7,5	360	237	365	310	132	11 x 15	54	B
ET3o_* - 8,0	8,0	360	247	365	310	142	11 x 15	60	B
ET3o_* - 10,0	10,0	360	270	365	310	162	11 x 15	71	B
ET3o_* - 12,5	12,5	420	255	425	370	158	11 x 15	82	B
ET3o_* - 15,0	15,0	420	265	425	370	168	11 x 15	91	B
ET3o_* - 16,0	16,0	420	265	425	370	168	11 x 15	92	B
ET3o_* - 20,0	20,0	480	290	485	430	190	13 x 18	117	B
ET3o_* - 22,5	22,5	480	300	485	430	200	13 x 18	129	B
ET3o_* - 25,0	25,0	480	305	485	430	210	13 x 18	139	B
ET3o_* - 30,0	30,0	480	315	485	430	220	13 x 18	154	B
ET3o_* - 40,0	40,0	540	350	545	490	240	13 x 18	195	B

*) - for transformer design with climatic/environmental class C2/E1 (maritime design W/3 or tropical design T/3) the letter "M" or "G" ought to be added depending on final application
**) - this table was prepared basing on the technical specification for transformer with voltage ratio 400//400 operating under normal conditions. For other conditions and data the values may change

Note:

Manufacturer reserves the right to make changes resulting from the continuous development of products offered.

If requested in advance, it is possible to manufacture transformer in other version.