Block ST Catalog Page
Control- and safety isolating- resp. isolating
transformer
ST
Typ ST 20/23/12 ST 20/23/24 ST 20/23/23 ST 20/4/23 ST 63/23/12 ST 63/23/24
Input
Rated input voltage 230 Vac 230 Vac 230 Vac 400 Vac 230 Vac 230 Vac
Tappings Input ±5 % ±5 % ±5 % ±5 % ±5 % ±5 %
Frequency range 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz
Output
Rated output voltage 12 Vac 24 Vac 230 Vac 230 Vac 12 Vac 24 Vac
Rated power VDE (DB cos phi=1) 20 VA 20 VA 20 VA 20 VA 63 VA 63 VA
Rated power VDE (KB cos phi=0.5) 42 VA 42 VA 42 VA 42 VA 110 VA 110 VA
No-load voltage (app. x factor) 1.10 1.10 1.10 1.10 1.10 1.10
Efficiency 81.0 % 81.0 % 81.0 % 81.0 % 84.0 % 84.0 %
Standards
Classification
Safety isolating transformer Safety isolating transformer Isolating transformer Isolating transformer Control- and safety isolating
transformer
Control- and safety isolating
transformer
Approvals
Approvals cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE)
Environment
Ambient temperature max. 40 °C 40 °C 40 °C 40 °C 40 °C 40 °C
Type of cooling self-cooling self-cooling self-cooling self-cooling self-cooling self-cooling
Safety and protection
Type
Open type Open type Open type Open type Open type Open type
Insulation class
VDE=B, UL=class 105 VDE=B, UL=class 105 VDE=B, UL=class 105 VDE=B, UL=class 105 VDE=B, UL=class 105 VDE=B, UL=class 105
Protection index
IP 00 IP 00 IP 00 IP 00 IP 00 IP 00
Safety class (prepared)
I I I I I I
Short circuit strength
non-short-circuit proof non-short-circuit proof non-short-circuit proof non-short-circuit proof non-short-circuit proof non-short-circuit proof
PRI Fusing recommendation
by circuit breaker with
tripping characteristic type
20 x Irated related to set)
Setting range 0.10 - 0.16 A 0.10 - 0.16 A 0.10 - 0.16 A 0.10 - 0.16 A 0.25 - 0.40 A 0.25 - 0.40 A
Setting value 0.11 A 0.11 A 0.11 A 0.10 A 0.33 A 0.33 A
Order numbers
Order Number ST 20/23/12 ST 20/23/24 ST 20/23/23 ST 20/4/23 ST 63/23/12 ST 63/23/24
+
-
Transformers
Control transformers
1
Control- and safety isolating- resp. isolating
transformer
ST
General Data
Rated input voltage 230 - 690 Vac
Rated output voltage 12 - 230 Vac
Rated power 20 - 2500 VA
Insulation class B
Maximum ambient temperature 40 °C
Efficiency up to 96 %
Degree of protection IP 00
Advantages
Very good switch-on behaviour thanks to reduced starting currents
High performance for the volume thanks to compact design
Primary side ±5 % tappings for voltage adjustment
Very good corrosion protection and low noise thanks to vacuum
impregnation
Contact protected screw connection terminals complying with UVV BGV A3
Simple mounting thanks to robust metal footplate with oval slots
Applications
As a control transformer for the electrical isolation of the input and output
sides.The construction of the transformer to supply control systems according
to VDE 0113 is designed.
As an isolating transformer for the safe electrical isolation of the input and
output sides. The transformer may be used to set up protective separation as a
protective measure in accordance with VDE 0100.
As a safety isolating transformer for the safe electrical isolation of the input
and output sides. The transformer is suitable for creating SELV and PELV
circuits because of the limit on the output voltage.
Sample application
Standards 2 | " Z
Control transformer
to: VDE 0570 Teil 2-2, DIN EN 61558-2-2, EN 61558-2-2, IEC 61558-2-2,
UL 5085-1/-2, CSA 22.2 No.66
Safety isolating transformer
to: VDE 0570 Teil 2-6, DIN EN 61558-2-6, EN 61558-2-6, IEC 61558-2-6, UL
5085-1/-2, CSA 22.2 No.66
Isolating transformer
to: VDE 0570 Part2-4, DIN EN 61558-2-4, EN 61558-2-4, IEC 61558-2-4, UL
5085-1/-2, CSA 22.2 No.66
Subject to change
44
Approvals W J v Z
ENEC 10 (VDE), UL 5085-1/-2, CSA 22.2 No.66
+
-
1.2
5.1
1.3
2.1
2.2
3.1
3.2
3.3
5.2
4.0
Transformers
Control transformers
1
Control- and safety isolating- resp. isolating
transformer
ST
Typ ST 20/23/12 ST 20/23/24 ST 20/23/23 ST 20/4/23 ST 63/23/12 ST 63/23/24
Input
Rated input voltage 230 Vac 230 Vac 230 Vac 400 Vac 230 Vac 230 Vac
Tappings Input ±5 % ±5 % ±5 % ±5 % ±5 % ±5 %
Frequency range 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz
Output
Rated output voltage 12 Vac 24 Vac 230 Vac 230 Vac 12 Vac 24 Vac
Rated power VDE (DB cos phi=1) 20 VA 20 VA 20 VA 20 VA 63 VA 63 VA
Rated power VDE (KB cos phi=0.5) 42 VA 42 VA 42 VA 42 VA 110 VA 110 VA
No-load voltage (app. x factor) 1.10 1.10 1.10 1.10 1.10 1.10
Efficiency 81.0 % 81.0 % 81.0 % 81.0 % 84.0 % 84.0 %
Standards
Classification
Approvals
Approvals cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE)
Environment
Ambient temperature max. 40 °C 40 °C 40 °C 40 °C 40 °C 40 °C
Type of cooling self-cooling self-cooling self-cooling self-cooling self-cooling self-cooling
Safety and protection
Type
Insulation class
Protection index
Safety class (prepared)
Short circuit strength
PRI Fusing recommendation
by circuit breaker with
tripping characteristic type
20 x Irated related to set)
Setting range 0.10 - 0.16 A 0.10 - 0.16 A 0.10 - 0.16 A 0.10 - 0.16 A 0.25 - 0.40 A 0.25 - 0.40 A
Setting value 0.11 A 0.11 A 0.11 A 0.10 A 0.33 A 0.33 A
Order numbers
Order Number ST 20/23/12 ST 20/23/24 ST 20/23/23 ST 20/4/23 ST 63/23/12 ST 63/23/24
Safety isolating transformer Safety isolating transformer Isolating transformer Isolating transformer Control- and safety isolating
Open type Open type Open type Open type Open type Open type
VDE=B, UL=class 105 VDE=B, UL=class 105 VDE=B, UL=class 105 VDE=B, UL=class 105 VDE=B, UL=class 105 VDE=B, UL=class 105
IP 00 IP 00 IP 00 IP 00 IP 00 IP 00
I I I I I I
non-short-circuit proof non-short-circuit proof non-short-circuit proof non-short-circuit proof non-short-circuit proof non-short-circuit proof
transformer
Control- and safety isolating
transformer
1.1
Subject to change
45
+
-
Control- and safety isolating- resp. isolating
transformer
ST
Typ ST 100/23/12 ST 100/23/24 ST 100/23/23 ST 100/4/24 ST 100/4/23 ST 100/69/23
Input
Rated input voltage 230 Vac 230 Vac 230 Vac 400 Vac 400 Vac 690 Vac
Tappings Input ±5 % ±5 % ±5 % ±5 % ±5 % ±5 %
Frequency range 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz
Output
Rated output voltage 12 Vac 24 Vac 230 Vac 24 Vac 230 Vac 230 Vac
Rated power VDE (DB cos phi=1) 100 VA 100 VA 100 VA 100 VA 100 VA 100 VA
Rated power VDE (KB cos phi=0.5) 225 VA 225 VA 225 VA 225 VA 225 VA 225 VA
No-load voltage (app. x factor) 1.10 1.10 1.10 1.10 1.10 1.10
Efficiency 86.0 % 86.0 % 86.0 % 86.0 % 86.0 % 86.0 %
Standards
Classification
Control- and safety isolating
transformer
Control- and safety isolating
transformer
Control- and isolating
transformer
Control- and safety isolating
transformer
Control- and isolating
transformer
Control- and isolating
transformer
Approvals
Approvals cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) -
Environment
Ambient temperature max. 40 °C 40 °C 40 °C 40 °C 40 °C 40 °C
Type of cooling self-cooling self-cooling self-cooling self-cooling self-cooling self-cooling
Safety and protection
Type
Open type Open type Open type Open type Open type Open type
Insulation class
VDE=B, UL=class 105 VDE=B, UL=class 105 VDE=B, UL=class 105 VDE=B, UL=class 105 VDE=B, UL=class 105 B
Protection index
IP 00 IP 00 IP 00 IP 00 IP 00 IP 00
Safety class (prepared)
I I I I I I
Short circuit strength
non-short-circuit proof non-short-circuit proof non-short-circuit proof non-short-circuit proof non-short-circuit proof non-short-circuit proof
PRI Fusing recommendation
by circuit breaker with
tripping characteristic type
20 x Irated related to set)
Setting range 0.40 - 0.63 A 0.40 - 0.63 A 0.40 - 0.63 A 0.25 - 0.40 A 0.25 - 0.40 A 0.15 - 0.25 A
Setting value 0.50 A 0.50 A 0.50 A 0.29 A 0.29 A 0.18 A
Order numbers
Order Number ST 100/23/12 ST 100/23/24 ST 100/23/23 ST 100/4/24 ST 100/4/23 ST 100/69/23
+
-
Transformers
Control transformers
1
Control- and safety isolating- resp. isolating
transformer
ST
Typ ST 63/23/23 ST 63/4/24 ST 63/4/42 ST 63/4/23 ST 63/44/23 ST 63/69/23
Input
Rated input voltage 230 Vac 400 Vac 400 Vac 400 Vac 440 Vac 690 Vac
Tappings Input ±5 % ±5 % ±5 % ±5 % ±5 % ±5 %
Frequency range 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz
Output
Rated output voltage 230 Vac 24 Vac 42 Vac 230 Vac 230 Vac 230 Vac
Rated power VDE (DB cos phi=1) 63 VA 63 VA 63 VA 63 VA 63 VA 63 VA
Rated power VDE (KB cos phi=0.5) 110 VA 110 VA 110 VA 110 VA 110 VA 110 VA
No-load voltage (app. x factor) 1.10 1.10 1.10 1.10 1.10 1.10
Efficiency 84.0 % 84.0 % 84.0 % 84.0 % 84.0 % 84.0 %
Standards
Classification
Approvals
Approvals cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) -
Environment
Ambient temperature max. 40 °C 40 °C 40 °C 40 °C 40 °C 40 °C
Type of cooling self-cooling self-cooling self-cooling self-cooling self-cooling self-cooling
Safety and protection
Type
Insulation class
Protection index
Safety class (prepared)
Short circuit strength
PRI Fusing recommendation
by circuit breaker with
tripping characteristic type
20 x Irated related to set)
Setting range 0.25 - 0.40 A 0.16 - 0.25 A 0.16 - 0.25 A 0.16 - 0.25 A 0.16 - 0.25 A 0.10 - 0.16 A
Setting value 0.33 A 0.19 A 0.19 A 0.19 A 0.17 A 0.10 A
Order numbers
Order Number ST 63/23/23 ST 63/4/24 ST 63/4/42 ST 63/4/23 ST 63/44/23 ST 63/69/23
Control- and isolating
transformer
Open type Open type Open type Open type Open type Open type
VDE=B, UL=class 105 VDE=B, UL=class 105 VDE=B, UL=class 105 VDE=B, UL=class 105 VDE=B, UL=class 105 B
IP 00 IP 00 IP 00 IP 00 IP 00 IP 00
I I I I I I
non-short-circuit proof non-short-circuit proof non-short-circuit proof non-short-circuit proof non-short-circuit proof non-short-circuit proof
Control- and safety isolating
transformer
Control- and safety isolating
transformer
Control- and isolating
transformer
Control- and isolating
transformer
Control- and isolating
transformer
Subject to change
46
+
-
1.2
5.1
1.3
2.1
2.2
3.1
3.2
3.3
5.2
4.0
Transformers
Control transformers
1
Control- and safety isolating- resp. isolating
transformer
ST
Typ ST 100/23/12 ST 100/23/24 ST 100/23/23 ST 100/4/24 ST 100/4/23 ST 100/69/23
Input
Rated input voltage 230 Vac 230 Vac 230 Vac 400 Vac 400 Vac 690 Vac
Tappings Input ±5 % ±5 % ±5 % ±5 % ±5 % ±5 %
Frequency range 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz
Output
Rated output voltage 12 Vac 24 Vac 230 Vac 24 Vac 230 Vac 230 Vac
Rated power VDE (DB cos phi=1) 100 VA 100 VA 100 VA 100 VA 100 VA 100 VA
Rated power VDE (KB cos phi=0.5) 225 VA 225 VA 225 VA 225 VA 225 VA 225 VA
No-load voltage (app. x factor) 1.10 1.10 1.10 1.10 1.10 1.10
Efficiency 86.0 % 86.0 % 86.0 % 86.0 % 86.0 % 86.0 %
Standards
Classification
Approvals
Approvals cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) -
Environment
Ambient temperature max. 40 °C 40 °C 40 °C 40 °C 40 °C 40 °C
Type of cooling self-cooling self-cooling self-cooling self-cooling self-cooling self-cooling
Safety and protection
Type
Insulation class
Protection index
Safety class (prepared)
Short circuit strength
PRI Fusing recommendation
by circuit breaker with
tripping characteristic type
20 x Irated related to set)
Setting range 0.40 - 0.63 A 0.40 - 0.63 A 0.40 - 0.63 A 0.25 - 0.40 A 0.25 - 0.40 A 0.15 - 0.25 A
Setting value 0.50 A 0.50 A 0.50 A 0.29 A 0.29 A 0.18 A
Order numbers
Order Number ST 100/23/12 ST 100/23/24 ST 100/23/23 ST 100/4/24 ST 100/4/23 ST 100/69/23
Control- and safety isolating
transformer
Open type Open type Open type Open type Open type Open type
VDE=B, UL=class 105 VDE=B, UL=class 105 VDE=B, UL=class 105 VDE=B, UL=class 105 VDE=B, UL=class 105 B
IP 00 IP 00 IP 00 IP 00 IP 00 IP 00
I I I I I I
non-short-circuit proof non-short-circuit proof non-short-circuit proof non-short-circuit proof non-short-circuit proof non-short-circuit proof
Control- and safety isolating
transformer
Control- and isolating
transformer
Control- and safety isolating
transformer
Control- and isolating
transformer
Control- and isolating
transformer
1.1
Subject to change
47
+
-
Control- and safety isolating- resp. isolating
transformer
ST
Typ ST 160/4/24 ST 160/4/23 ST 160/69/23 ST 250/23/12 ST 250/23/24 ST 250/23/42
Input
Rated input voltage 400 Vac 400 Vac 690 Vac 230 Vac 230 Vac 230 Vac
Tappings Input ±5 % ±5 % ±5 % ±5 % ±5 % ±5 %
Frequency range 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz
Output
Rated output voltage 24 Vac 230 Vac 230 Vac 12 Vac 24 Vac 42 Vac
Rated power VDE (DB cos phi=1) 160 VA 160 VA 160 VA 250 VA 250 VA 250 VA
Rated power VDE (KB cos phi=0.5) 390 VA 390 VA 390 VA 555 VA 555 VA 555 VA
No-load voltage (app. x factor) 1.09 1.09 1.09 1.08 1.08 1.08
Efficiency 87.0 % 87.0 % 87.0 % 90.0 % 90.0 % 90.0 %
Standards
Classification
Control- and safety isolating
transformer
Control- and isolating
transformer
Control- and isolating
transformer
Control- and safety isolating
transformer
Control- and safety isolating
transformer
Control- and safety isolating
transformer
Approvals
Approvals cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) - cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE)
Environment
Ambient temperature max. 40 °C 40 °C 40 °C 40 °C 40 °C 40 °C
Type of cooling self-cooling self-cooling self-cooling self-cooling self-cooling self-cooling
Safety and protection
Type
Open type Open type Open type Open type Open type Open type
Insulation class
VDE=B, UL=class 105 VDE=B, UL=class 105 B VDE=B, UL=class 105 VDE=B, UL=class 105 VDE=B, UL=class 105
Protection index
IP 00 IP 00 IP 00 IP 00 IP 00 IP 00
Safety class (prepared)
I I I I I I
Short circuit strength
non-short-circuit proof non-short-circuit proof non-short-circuit proof non-short-circuit proof non-short-circuit proof non-short-circuit proof
PRI Fusing recommendation
by circuit breaker with
tripping characteristic type
20 x Irated related to set)
Setting range 0.40 - 0.63 A 0.40 - 0.63 A 0.25 - 0.40 A 1.00 - 1.60 A 1.00 - 1.60 A 1.00 - 1.60 A
Setting value 0.45 A 0.45 A 0.28 A 1.20 A 1.20 A 1.20 A
Order numbers
Order Number ST 160/4/24 ST 160/4/23 ST 160/69/23 ST 250/23/12 ST 250/23/24 ST 250/23/42
+
-
Transformers
Control transformers
1
Control- and safety isolating- resp. isolating
transformer
ST
Typ ST 130/23/24 ST 130/23/11 ST 130/4/23 ST 130/69/23 ST 160/23/24 ST 160/23/23
Input
Rated input voltage 230 Vac 230 Vac 400 Vac 690 Vac 230 Vac 230 Vac
Tappings Input ±5 % ±5 % ±5 % ±5 % ±5 % ±5 %
Frequency range 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz 50 - 60 Hz
Output
Rated output voltage 24 Vac 110 Vac 230 Vac 230 Vac 24 Vac 230 Vac
Rated power VDE (DB cos phi=1) 130 VA 130 VA 130 VA 130 VA 160 VA 160 VA
Rated power VDE (KB cos phi=0.5) 300 VA 300 VA 300 VA 300 VA 390 VA 390 VA
No-load voltage (app. x factor) 1.10 1.10 1.10 1.10 1.10 1.09
Efficiency 86.0 % 86.0 % 86.0 % 86.0 % 86.0 % 87.0 %
Standards
Classification
Approvals
Approvals cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE) - cURus, ENEC 10 (VDE) cURus, ENEC 10 (VDE)
Environment
Ambient temperature max. 40 °C 40 °C 40 °C 40 °C 40 °C 40 °C
Type of cooling self-cooling self-cooling self-cooling self-cooling self-cooling self-cooling
Safety and protection
Type
Insulation class
Protection index
Safety class (prepared)
Short circuit strength
PRI Fusing recommendation
by circuit breaker with
tripping characteristic type
20 x Irated related to set)
Setting range 0.63 - 1.00 A 0.63 - 1.00 A 0.25 - 0.40 A 0.16 - 0.25 A 0.63 - 1.00 A 0.63 - 1.00 A
Setting value 0.64 A 0.64 A 0.37 A 0.23 A 0.78 A 0.78 A
Order numbers
Order Number ST 130/23/24 ST 130/23/11 ST 130/4/23 ST 130/69/23 ST 160/23/24 ST 160/23/23
Control- and safety isolating
transformer
Open type Open type Open type Open type Open type Open type
VDE=B, UL=class 105 VDE=B, UL=class 105 VDE=B, UL=class 105 B VDE=B, UL=class 105 VDE=B, UL=class 105
IP 00 IP 00 IP 00 IP 00 IP 00 IP 00
I I I I I I
non-short-circuit proof non-short-circuit proof non-short-circuit proof non-short-circuit proof non-short-circuit proof non-short-circuit proof
Control- and isolating
transformer
Control- and isolating
transformer
Control- and isolating
transformer
Control- and safety isolating
transformer
Control- and isolating
transformer
Subject to change
48
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