Safety transformers with galvanic isolation provide a reliable supply to power circuits with the safety measures “protective separation” or “protection through shutdown”. Double or reinforced isolation between the primary and secondary sides protects SELV and PELV circuits. Safety transformers provide safety extra low voltages below 50 Vac or 120 Vdc. BLOCK’s standard range includes power ratings of between 0.5 VA and 2,500 VA.
Product search for Safety transformers
Equipment type
Output power
- 0.35 VA (14)
- 0.5 VA (14)
- 1 VA (15)
- 1.2 VA (11)
- 1.5 VA (16)
- 10 VA (34)
- 100 VA (25)
- 1000 VA (3)
- 120 VA (7)
- 13 VA (18)
- 130 VA (2)
- 14 VA (7)
- 15 VA (8)
- 16 VA (26)
- 160 VA (15)
- 1600 VA (2)
- 18 VA (12)
- 2 VA (17)
- 2.3 VA (16)
- 2.8 VA (11)
- 20 VA (9)
- 200 VA (7)
- 2000 VA (1)
- 22 VA (13)
- 225 VA (6)
- 24 VA (7)
- 25 VA (15)
- 250 VA (18)
- 2500 VA (2)
- 28 VA (5)
- 3.2 VA (28)
- 30 VA (28)
- 300 VA (3)
- 320 VA (3)
- 330 VA (2)
- 36 VA (12)
- 4 VA (7)
- 4.5 VA (13)
- 40 VA (11)
- 400 VA (11)
- 42 VA (7)
- 5 VA (26)
- 50 VA (24)
- 500 VA (8)
- 52 VA (7)
- 6 VA (7)
- 60 VA (9)
- 63 VA (11)
- 630 VA (6)
- 7.5 VA (18)
- 8 VA (6)
- 80 VA (6)
- 800 VA (3)
Input voltage
- 115 Vac (2)
- 2 x 115 Vac (151)
- 208 Vac (5)
- 210 Vac (9)
- 219 Vac (4)
- 230 Vac (446)
- 241 Vac (4)
- 250 Vac (9)
- 380 Vac (16)
- 400 Vac (52)
- 415 Vac (5)
- 420 Vac (11)
- 440 Vac (14)
- 460 Vac (14)
- 480 Vac (14)
- 500 Vac (14)
- 520 Vac (9)
- 525 Vac (5)
- 540 Vac (9)
- 550 Vac (5)
- 575 Vac (5)
- 600 Vac (5)
Output voltage
- 11.3 Vac (2)
- 115 Vac (1)
- 12 Vac (32)
- 15 Vac (24)
- 18 Vac (25)
- 2 x 12 Vac (96)
- 2 x 15 Vac (60)
- 2 x 18 Vac (60)
- 2 x 24 Vac (3)
- 2 x 5 Vac (10)
- 2 x 6 Vac (47)
- 2 x 8 Vac (39)
- 2 x 9 Vac (54)
- 230 Vac (3)
- 24 Vac (81)
- 42 Vac (6)
- 6 Vac (27)
- 8 Vac (23)
- 9 Vac (24)
Design
Degree of protection
Connections
Fixing method
Approvals
612 Versions of 20 products
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USTE
Universal control transformer
Universal input voltages, PRI 208 – 600 Vac, SEC 2 x 12 – 2 x 115 Vac, 100 – 3,200 VA
| Version | Rated input voltage | Rated output voltage | Rated power VDE (DB cos phi=1) | |
|---|---|---|---|---|
| USTE 40/2x12 | 208 Vac/ 230 Vac/ 380 Vac/ 400 Vac/ 415 Vac/ 440 Vac/ 460 Vac/ 480 Vac/ 500 Vac/ 525 Vac/ 550 Vac/ 575 Vac/ 600 Vac | 2 x 12 Vac | 40 VA | |
| USTE 100/2x12 | 208 Vac/ 230 Vac/ 380 Vac/ 400 Vac/ 415 Vac/ 440 Vac/ 460 Vac/ 480 Vac/ 500 Vac/ 525 Vac/ 550 Vac/ 575 Vac/ 600 Vac | 2 x 12 Vac | 100 VA | |
| USTE 250/2x12 | 208 Vac/ 230 Vac/ 380 Vac/ 400 Vac/ 415 Vac/ 440 Vac/ 460 Vac/ 480 Vac/ 500 Vac/ 525 Vac/ 550 Vac/ 575 Vac/ 600 Vac | 2 x 12 Vac | 250 VA | |
| USTE 400/2x12 | 208 Vac/ 230 Vac/ 380 Vac/ 400 Vac/ 415 Vac/ 440 Vac/ 460 Vac/ 480 Vac/ 500 Vac/ 525 Vac/ 550 Vac/ 575 Vac/ 600 Vac | 2 x 12 Vac | 400 VA | |
| USTE 630/2x12 | 208 Vac/ 230 Vac/ 380 Vac/ 400 Vac/ 415 Vac/ 440 Vac/ 460 Vac/ 480 Vac/ 500 Vac/ 525 Vac/ 550 Vac/ 575 Vac/ 600 Vac | 2 x 12 Vac | 630 VA |
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STEU
Control- and safety isolating- resp. isolating transformer
PRI 230/400 Vac, SEC 2 x 12 – 2 x 115 Vac, 63 – 2,500 VA, Spring terminals
| Version | Rated input voltage | Rated output voltage | Rated power VDE (DB cos phi=1) | |
|---|---|---|---|---|
| STEU 20/24 | 230/400 Vac | 2 x 12 Vac | 20 VA | |
| STEU 63/48 | 230/400 Vac | 2 x 24 Vac | 63 VA | |
| STEU 100/24 | 230/400 Vac | 2 x 12 Vac | 100 VA | |
| STEU 160/24 | 230/400 Vac | 2 x 12 Vac | 160 VA | |
| STEU 250/24 | 230/400 Vac | 2 x 12 Vac | 250 VA | |
| STEU 320/24 | 230/400 Vac | 2 x 12 Vac | 320 VA | |
| STEU 400/24 | 230/400 Vac | 2 x 12 Vac | 400 VA | |
| STEU 500/24 | 230/400 Vac | 2 x 12 Vac | 500 VA | |
| STEU 630/24 | 230/400 Vac | 2 x 12 Vac | 630 VA | |
| STEU 800/24 | 230/400 Vac | 2 x 12 Vac | 800 VA | |
| STEU 1000/24 | 230/400 Vac | 2 x 12 Vac | 1,000 VA |
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STE
Control- and safety isolating- resp. isolating transformer
PRI 230 – 400 Vac, SEC 24 – 230 Vac, 63 – 2,500 VA, Spring clamp terminals
| Version | Rated input voltage | Rated output voltage | Rated power VDE (DB cos phi=1) | |
|---|---|---|---|---|
| STE 63/23/24 | 230 Vac | 24 Vac | 63 VA | |
| STE 63/4/24 | 400 Vac | 24 Vac | 63 VA | |
| STE 100/23/24 | 230 Vac | 24 Vac | 100 VA | |
| STE 160/23/24 | 230 Vac | 24 Vac | 160 VA | |
| STE 250/23/24 | 230 Vac | 24 Vac | 250 VA | |
| STE 250/4/24 | 400 Vac | 24 Vac | 250 VA | |
| STE 320/23/24 | 230 Vac | 24 Vac | 320 VA | |
| STE 400/23/24 | 230 Vac | 24 Vac | 400 VA | |
| STE 500/23/24 | 230 Vac | 24 Vac | 500 VA | |
| STE 500/4/24 | 400 Vac | 24 Vac | 500 VA |
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ST
Control- and safety isolating- resp. isolating transformer
Base plate, PRI 115 – 690 Vac, SEC 12 – 230 Vac, 20 – 2,500 VA
| Version | Rated input voltage | Rated output voltage | Rated power VDE (DB cos phi=1) | |
|---|---|---|---|---|
| ST 20/23/12 | 230 Vac | 12 Vac | 20 VA | |
| ST 20/23/24 | 230 Vac | 24 Vac | 20 VA | |
| ST 63/11/24 | 115 Vac | 24 Vac | 63 VA | |
| ST 63/23/12 | 230 Vac | 12 Vac | 63 VA | |
| ST 63/23/24 | 230 Vac | 24 Vac | 63 VA | |
| ST 63/4/24 | 400 Vac | 24 Vac | 63 VA | |
| ST 63/4/42 | 400 Vac | 42 Vac | 63 VA | |
| ST 100/23/12 | 230 Vac | 12 Vac | 100 VA | |
| ST 100/23/24 | 230 Vac | 24 Vac | 100 VA | |
| ST 100/4/24 | 400 Vac | 24 Vac | 100 VA | |
| ST 130/23/24 | 230 Vac | 24 Vac | 130 VA | |
| ST 160/23/24 | 230 Vac | 24 Vac | 160 VA | |
| ST 160/4/24 | 400 Vac | 24 Vac | 160 VA | |
| ST 250/11/24 | 115 Vac | 24 Vac | 250 VA | |
| ST 250/23/12 | 230 Vac | 12 Vac | 250 VA | |
| ST 250/23/24 | 230 Vac | 24 Vac | 250 VA | |
| ST 250/23/42 | 230 Vac | 42 Vac | 250 VA | |
| ST 250/4/24 | 400 Vac | 24 Vac | 250 VA | |
| ST 320/23/24 | 230 Vac | 24 Vac | 320 VA | |
| ST 400/23/24 | 230 Vac | 24 Vac | 400 VA | |
| ST 400/4/24 | 400 Vac | 24 Vac | 400 VA | |
| ST 500/23/24 | 230 Vac | 24 Vac | 500 VA | |
| ST 500/23/42 | 230 Vac | 42 Vac | 500 VA | |
| ST 500/4/24 | 400 Vac | 24 Vac | 500 VA | |
| ST 630/23/42 | 230 Vac | 42 Vac | 500 VA | |
| ST 800/4/24 | 400 Vac | 24 Vac | 800 VA |
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STU
Universal control- and safety isolating- resp. isolating transformer
Universal input voltages, PRI 210 – 540 Vac, SEC 24 – 2 x 115 Vac, 63 – 2,500 VA
| Version | Rated input voltage | Rated output voltage | Rated power VDE (DB cos phi=1) | |
|---|---|---|---|---|
| STU 63/24 | 210 Vac/230 Vac/250 Vac/ 380 Vac/400 Vac/420 Vac/ 440 Vac/460 Vac/480 Vac/ 500 Vac/520 Vac/540 Vac | 24 Vac | 63 VA | |
| STU 100/24 | 210 Vac/230 Vac/250 Vac/ 380 Vac/400 Vac/420 Vac/ 440 Vac/460 Vac/480 Vac/ 500 Vac/520 Vac/540 Vac | 24 Vac | 100 VA | |
| STU 130/24 | 210 Vac/230 Vac/250 Vac/ 380 Vac/400 Vac/420 Vac/ 440 Vac/460 Vac/480 Vac/ 500 Vac/520 Vac/540 Vac | 24 Vac | 130 VA | |
| STU 160/24 | 210 Vac/230 Vac/250 Vac/ 380 Vac/400 Vac/420 Vac/ 440 Vac/460 Vac/480 Vac/ 500 Vac/520 Vac/540 Vac | 24 Vac | 160 VA | |
| STU 250/24 | 210 Vac/230 Vac/250 Vac/ 380 Vac/400 Vac/420 Vac/ 440 Vac/460 Vac/480 Vac/ 500 Vac/520 Vac/540 Vac | 24 Vac | 250 VA | |
| STU 400/24 | 210 Vac/230 Vac/250 Vac/ 380 Vac/400 Vac/420 Vac/ 440 Vac/460 Vac/480 Vac/ 500 Vac/520 Vac/540 Vac | 24 Vac | 400 VA | |
| STU 500/24 | 210 Vac/230 Vac/250 Vac/ 380 Vac/400 Vac/420 Vac/ 440 Vac/460 Vac/480 Vac/ 500 Vac/520 Vac/540 Vac | 24 Vac | 500 VA | |
| STU 630/24 | 210 Vac/230 Vac/250 Vac/ 380 Vac/400 Vac/420 Vac/ 440 Vac/460 Vac/480 Vac/ 500 Vac/520 Vac/540 Vac | 24 Vac | 630 VA | |
| STU 800/24 | 210 Vac/230 Vac/250 Vac/ 380 Vac/400 Vac/420 Vac/ 440 Vac/460 Vac/480 Vac/ 500 Vac/520 Vac/540 Vac | 24 Vac | 800 VA |
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STSU
Control- and safety isolating- resp. isolating transformer with shielding winding
Dual input voltage 230 and 400 Vac, Dual input voltage 230 and 400 Vac, SEC 2 x 12 2 x 115 Vac , 40 – 2,500 VA
| Version | Rated input voltage | Rated output voltage | Rated power VDE (DB cos phi=1) | |
|---|---|---|---|---|
| STSU 40/24 | 230/400 Vac | 2 x 12 Vac | 40 VA | |
| STSU 63/24 | 230/400 Vac | 2 x 12 Vac | 63 VA | |
| STSU 100/24 | 230/400 Vac | 2 x 12 Vac | 100 VA | |
| STSU 160/24 | 230/400 Vac | 2 x 12 Vac | 160 VA | |
| STSU 250/24 | 230/400 Vac | 2 x 12 Vac | 250 VA | |
| STSU 400/24 | 230/400 Vac | 2 x 12 Vac | 400 VA | |
| STSU 630/24 | 230/400 Vac | 2 x 12 Vac | 630 VA | |
| STSU 1000/24 | 230/400 Vac | 2 x 12 Vac | 1,000 VA |
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TT1
Control- and safety isolating- resp. isolating transformer
Fixing rail, PRI 230/400 Vac, SEC 24, 42, 2 x 115 Vac, 1,000 – 25,000 VA
| Version | Rated input voltage | Rated output voltage | Rated power VDE (DB cos phi=1) | |
|---|---|---|---|---|
| TT1 1-23-24 | 219/230/241 Vac | 24 Vac | 1,000 VA | |
| TT1 1,6-4-42 | 380/400/420 Vac | 42 Vac | 1,600 VA | |
| TT1 1,6-23-24 | 219/230/241 Vac | 24 Vac | 1,600 VA | |
| TT1 2-23-24 | 219/230/241 Vac | 24 Vac | 2,000 VA | |
| TT1 2,5-4-42 | 380/400/420 Vac | 42 Vac | 2,500 VA | |
| TT1 2,5-23-24 | 219/230/241 Vac | 24 Vac | 2,500 VA |
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FST
FAIL-SAFE transformer
DIN rail, PRI 230/400 Vac, SEC 24/230 Vac, 100 VA/160 VA/250 VA
| Version | Rated input voltage | Rated output voltage | Rated power VDE (DB cos phi=1) | |
|---|---|---|---|---|
| FST 100/23 | 230 Vac/400 Vac | 230 Vac | 100 VA | |
| FST 100/24 | 230 Vac/400 Vac | 24 Vac | 100 VA | |
| FST 160/23 | 230 Vac/400 Vac | 230 Vac | 160 VA | |
| FST 160/24 | 230 Vac/400 Vac | 24 Vac | 160 VA | |
| FST 250/23 | 230 Vac/400 Vac | 230 Vac | 250 VA | |
| FST 250/24 | 230 Vac/400 Vac | 24 Vac | 250 VA |
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EL
Safety isolating transformer
Base plate, PRI 230 Vac, SEC 2 x 6 – 2 x 24 Vac, 7.5 – 100 VA
| Version | Rated input voltage | Rated output voltage | Power | |
|---|---|---|---|---|
| EL 7,5/6 | 230 Vac | 2 x 6 Vac | 7.5 VA | |
| EL 7,5/9 | 230 Vac | 2 x 9 Vac | 7.5 VA | |
| EL 7,5/12 | 230 Vac | 2 x 12 Vac | 7.5 VA | |
| EL 7,5/15 | 230 Vac | 2 x 15 Vac | 7.5 VA | |
| EL 7,5/18 | 230 Vac | 2 x 18 Vac | 7.5 VA | |
| EL 13/6 | 230 Vac | 2 x 6 Vac | 13 VA | |
| EL 13/9 | 230 Vac | 2 x 9 Vac | 13 VA | |
| EL 13/12 | 230 Vac | 2 x 12 Vac | 13 VA | |
| EL 13/15 | 230 Vac | 2 x 15 Vac | 13 VA | |
| EL 13/18 | 230 Vac | 2 x 18 Vac | 13 VA | |
| EL 18/6 | 230 Vac | 2 x 6 Vac | 18 VA | |
| EL 18/9 | 230 Vac | 2 x 9 Vac | 18 VA | |
| EL 18/12 | 230 Vac | 2 x 12 Vac | 18 VA | |
| EL 18/15 | 230 Vac | 2 x 15 Vac | 18 VA | |
| EL 18/18 | 230 Vac | 2 x 18 Vac | 18 VA | |
| EL 28/6 | 230 Vac | 2 x 6 Vac | 28 VA | |
| EL 28/9 | 230 Vac | 2 x 9 Vac | 28 VA | |
| EL 28/12 | 230 Vac | 2 x 12 Vac | 28 VA | |
| EL 28/15 | 230 Vac | 2 x 15 Vac | 28 VA | |
| EL 28/18 | 230 Vac | 2 x 18 Vac | 28 VA | |
| EL 50/6 | 230 Vac | 2 x 6 Vac | 50 VA | |
| EL 50/9 | 230 Vac | 2 x 9 Vac | 50 VA | |
| EL 50/12 | 230 Vac | 2 x 12 Vac | 50 VA | |
| EL 50/15 | 230 Vac | 2 x 15 Vac | 50 VA | |
| EL 50/18 | 230 Vac | 2 x 18 Vac | 50 VA | |
| EL 100/9 | 230 Vac | 2 x 9 Vac | 100 VA | |
| EL 100/12 | 230 Vac | 2 x 12 Vac | 100 VA | |
| EL 100/15 | 230 Vac | 2 x 15 Vac | 100 VA | |
| EL 100/18 | 230 Vac | 2 x 18 Vac | 100 VA | |
| EL 100/24 | 230 Vac | 2 x 24 Vac | 100 VA |
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ACT
Safety isolating transformer
Panel installation on mounting rails, PRI 230 Vac, SEC 24 Vac, 10 - 100 VA
| Version | Rated input voltage | Rated output voltage | Power | |
|---|---|---|---|---|
| ACT 10 | 230 Vac | 24 Vac | 10 VA | |
| ACT 25 | 230 Vac | 24 Vac | 25 VA | |
| ACT 63 | 230 Vac | 24 Vac | 63 VA | |
| ACT 100 | 230 Vac | 24 Vac | 100 VA |
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