Isolating transformer

Protection against eavesdropping, EMC protection and stable network shape thanks to galvanic isolation. Ideal for location-independent applications, it protects the vehicle electrical system and offers end-to-end safety.

Product description:

The 3-phase isolating transformer is suitable for use in accordance with HD 60364-7-717 Requirements for premises, rooms and installations of a special kind - mobile or transportable units.

Available in two power versions: 36 kVA and 12 kVA
For operating temperatures between -25 and +40°C (storage -46 to +70°C)
Also available without EMC protection

The incoming mains supply is electrically isolated from the vehicle electrical system; the mains form of the incoming supply is independent, as a new mains supply is generated on the secondary side of the isolating transformer. The protective conductor of the feed network is thus separated from the vehicle electrical system. As a rule, a TN-S or IT system is generated. A pure TN-C system is not permitted.

The electrical equipment is designed and installed in accordance with electrical protection class II. An individual test is carried out for each isolating transformer in accordance with DIN EN 61439. The housing complies with protection class I and can be connected to an equipotential bonding rail via an earthing connection in order to equalize potential differences and dissipate EMC interference. The isolating transformer meets the requirements for radiation protection in accordance with A-962-2-NFD.

Technical data:

Designation	Isolating transformer NT
Performance	36 kVA	12 kVA
Item number	5004265	5004596
Weight	340 kg	185kg
Height	655 mm	655 mm
Length	815 mm	676 mm
Width	440 mm	440 mm
Material	Steel
Coating	KTL and powder coating
Color	RAL 9001 (cream white)
Protection class	IP 21
Protection class inner housing	II
Protection class outdoor housing	I
Ambient temp. operation	-25 to +40 °C
Ambient temp. storage	-46 to +70 °C
Tested according to	MIL-STD-810H Method 514.8 Procedure I, MIL-STD-810H Method 516.8 Procedure II

Isolating transformer according to	EN 61558-2-4
Performance	36 kVA	12 kVA
Input voltage	230 V/400 V AC +/-10 %
Input current	52,5 A	17,5 A
Frequency	50/60 Hz
Input network form	TN, TT, IT network
Output voltage	230 V/400 V AC
Output current	50 A	16 A
Output network form	TN or IT network
Duty cycle	S1/100 % ED
Cooling	Active (internal)	Passive
Short-circuit losses (core)	Approx. 320 W	Approx. 120 W
Idle losses (core)	Approx. 340 W	Approx. 125 watts
Short-circuit voltage	approx. 2.4 %
Type testing	according to DIN EN 61439
Inverter operation	Only possible if the isolating transformer is used before the inverter.
Inrush current limiter	Integrated
On/off cycles	max. 60 per hour
Recommended primary fuse	LS B/C50A 4-pole	LS B/C16A 4-pole
Recommended secondary fuse	LS switch or FI/LS switch
EMC protection	Possible, see options
Shielding attenuation	≥ 40dB
Type testing	IEEE STD 299:2007-01

Performance values and dimensions subject to change, slight deviations possible!

Mains input	Screw terminal, protective conductor insulated
Mains output	Ring cable lug, star point led out
Potential equalization	max. 16 mm² ring cable lug
Note	Design-related leakage currents >10mA, attach reinforced protective conductor min. 16mm²

Standards met

The following standards were observed in the design of the isolating transformer:

EN 60204-1:2018; 06/2019
EN ISO 12100:2011; 03/2011
EN ISO 13849-1:2015; 06/2016
EN 61558-2-4:2009; 12/2009
EN 62305-2:2012; 03/2013
EN 50274:2002; 11/2002
HD 60364-7-717:2010
HD 60364-5-54
A-962-2-NFD
VG 96907-1/2:2020;03/2020
DIN EN 60529:2014; 09/2014
DIN EN 61439-1:2012; 06/2012
DIN EN 61000-1/2:2017;07/2017
MIL-STD-810H Method 514.8 Procedure I
MIL-STD-810H METHOD 516.8, Procedure II
IEEE STD 299:2007-01

Possible options

The following options can be equipped:

Elimination of the mains output filter for shielded rooms:
Elimination of the corrugated pipe set as a pre-installed connection unit for the mains connection box

Thorsten Kutz, Head of Sales

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