Product range	Single-phase control transformers ST...
Basic function	Single-phase control, isolating and safety transformers STI, STZ
Rated input voltage	400± 5 % V
Rated output voltage	24 V
Rated power	0.4 kVA
Short-time rating	1.1 kVA
Terminal diagram / contact assignment
Cu factor	1,15 kg
Standards >Built and tested to
Standards >Suitable for use to	IEC/EN 61558-2-2/2-4/2-6 VDE 0570 Part 2-2 VDE 0570 Part 2‐6 (safety transformers) VDE 0570 Part 2-4 (isolating transformer)
Ambient temperature	IEC/EN 60204-1, ÖVE-EN 13 VDE 0113, VDE 0100 Part 410
Terminations	-25 - 40
Connection lugs
Insulation class	● (< 115 A)
Rated frequency	● (> 115 A)
Primary tapping	B
Degree of Protection	50 - 60 Hz
Separate windings	± 5 %
Fully vacuum-impregnated	IP00
Reinforced insulation	●
Rated duty factor	●
Note	●
Total weight	100 % DF
No-load losses
Short-circuit losses	The following applies for the no-load loss, short-circuit loss (copper losses), short-circuit voltage and efficiency values: all details relate to a temperature of 20 °C
Shortcircuit voltage	5.2 kg
Efficiency	17 W
Rated operational current for specified heat dissipation [In]	18 W
Heat dissipation per pole, current-dependent [Pvid]	4.4 %
Equipment heat dissipation, current-dependent [Pvid]	0.92
Static heat dissipation, non-current-dependent [Pvs]
Heat dissipation capacity [Pdiss]	0 A
Operating ambient temperature min.	0 W
Operating ambient temperature max.	0 W
10.2 Strength of materials and parts >10.2.2 Corrosion resistance	35 W
10.2 Strength of materials and parts >10.2.3.1 Verification of thermal stability of enclosures	0 W
10.2 Strength of materials and parts >10.2.3.2 Verification of resistance of insulating materials to normal heat	-25 °C
10.2 Strength of materials and parts >10.2.3.3 Verification of resistance of insulating materials to abnormal heat and fire due to internal electric effects	+40 °C
10.2 Strength of materials and parts >10.2.4 Resistance to ultra-violet (UV) radiation
10.2 Strength of materials and parts >10.2.5 Lifting	Meets the product standard´s requirements.
10.2 Strength of materials and parts >10.2.6 Mechanical impact	Meets the product standard´s requirements.
10.2 Strength of materials and parts >10.2.7 Inscriptions	Meets the product standard´s requirements.
10.3 Degree of protection of ASSEMBLIES	Meets the product standard´s requirements.
10.4 Clearances and creepage distances	Meets the product standard´s requirements.
10.5 Protection against electric shock	Does not apply, since the entire switchgear needs to be evaluated.
10.6 Incorporation of switching devices and components	Does not apply, since the entire switchgear needs to be evaluated.
10.7 Internal electrical circuits and connections	Meets the product standard´s requirements.
10.8 Connections for external conductors	Does not apply, since the entire switchgear needs to be evaluated.
10.9 Insulation properties >10.9.2 Power-frequency electric strength	Meets the product standard´s requirements.
10.9 Insulation properties >10.9.3 Impulse withstand voltage	Does not apply, since the entire switchgear needs to be evaluated.
10.9 Insulation properties >10.9.4 Testing of enclosures made of insulating material	Does not apply, since the entire switchgear needs to be evaluated.
10.10 Temperature rise	Is the panel builder´s responsibility.
10.11 Short-circuit rating	Is the panel builder´s responsibility.
10.12 Electromagnetic compatibility	Is the panel builder´s responsibility.
10.13 Mechanical function	Is the panel builder´s responsibility.
Built as safety transformer	Is the panel builder´s responsibility.
Built as isolating transformer	The panel builder is responsible for the temperature rise calculation. Eaton will provide heat dissipation data for the devices.
Built as energy saving transformer	Is the panel builder´s responsibility. The specifications for the switchgear must be observed.
Primary voltage 1	Is the panel builder´s responsibility. The specifications for the switchgear must be observed.
Primary voltage 2	The device meets the requirements, provided the information in the instruction leaflet (IL) is observed.
Primary voltage 3
Primary voltage 4
Primary voltage 5	Yes
Primary voltage 6	Yes
Primary voltage 7	No
Primary voltage 8	400 - 400 V
Primary voltage 9	0 - 0 V
Primary voltage 10	0 - 0 V
Secondary voltage 1	0 - 0 V
Secondary voltage 2	0 - 0 V
Secondary voltage 3	0 - 0 V
Secondary voltage 4	0 - 0 V
Secondary voltage 5	0 - 0 V
Secondary voltage 6	0 - 0 V
Secondary voltage 7	0 - 0 V
Secondary voltage 8	24 - 24 V
Secondary voltage 9	0 - 0 V
Secondary voltage 10	0 - 0 V
Rated apparent power	0 - 0 V
Type of insulation material acc. IEC 85	0 - 0 V
Short-circuit-proof	0 - 0 V
Relative short circuit voltage	0 - 0 V
Width	0 - 0 V
Height	0 - 0 V
Depth	0 - 0 V
Degree of protection (IP)	400 VA
Ring core	B
Suitable for mounting on PCB	No
Modular version	4.4 %
Conductor material	121 mm
Product Standards	131 mm
UL File No.	100 mm
UL Category Control No.	IP00
CSA File No.	No
CSA Class No.	No
North America Certification	No
Specially designed for North America	Copper
Suitable for	UL 506; UL5085-1; UL 5085-2; CSA-C22.2 No. 66; CSA-C22.2 No. 66.1-06; CSA-C22.2 No. 66.2-06; IEC/EN 61558-2-2; CE marking
Max. Voltage Rating	E167225
Degree of Protection	XPTQ2, XPTQ8

As Mnelko, we are a reliable partner in industrial automation solutions, offering high-quality and innovative products with a wide product range to meet all the needs of your business. Our product portfolio consists of solutions designed based on the principles of high performance, durability, and efficiency to support modern industrial processes.
All of our products ensure maximum reliability even in challenging working conditions and help your business operations run smoothly. The products we offer in industrial automation, energy management, cabling solutions, and many other areas adapt flexibly to the needs of different sectors.
Additionally, our products are manufactured using only high-quality materials and comply with international standards. Through the solutions we provide, we enable our customers to increase operational efficiency and optimize costs. Our company closely follows technological advancements and continuously offers innovative products to help our customers gain a competitive advantage.
On each of our product pages, you can find comprehensive information about technical details, areas of use, and product features. You can explore all the products you need to strengthen your industrial processes on our website and enjoy a seamless purchasing experience.