The KNX bus power supply of the STEP POWER family is tailored ideally to modern building automation. As the first bus power supply, it has an active KNX filter circuit. This adapts dynamically to the connected KNX devices, increasing the efficiency of the bus system. The multifunctional color display shows all relevant KNX status information at a glance, such as the current bus load or historical values as a diagnostic tool in the menu. Thanks to the wide input voltage range of 85 V AC to 264 V AC and 90 V DC to 275 V DC, the KNX bus power supply can be used worldwide. The integrated Push-in lever connections complete the handling of the STEP POWER bus power supply.
STEP3-PS/1AC/KNX/640/LPT
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Bus power supply
1477019
Primary-switched bus power supply, STEP POWER, Lever Push-in connection, DIN rail or direct mounting, input: 1-phase, output: 30 V DC / 640 mA
Product details
| AC operation | |
| Supply system configuration | TN, TT, IT (PE) |
| Input voltage range | 100 V AC ... 240 V AC -15 % ... +10 % |
| Typical national grid voltage | 120 V AC |
| 230 V AC | |
| Voltage type of supply voltage | AC |
| Inrush current | typ. 35 A (25 °C) |
| Inrush current integral (I2t) | typ. 1.3 A2s |
| Frequency range (fN) | 50 Hz ... 60 Hz ±10 % |
| Mains buffering time | typ. 100 ms (100 V AC) |
| typ. 100 ms (230 V AC) | |
| Current consumption | 0.41 A (100 V AC) |
| 0.22 A (240 V AC) | |
| Protective circuit | Transient surge protection; Varistor |
| Switch-on time | typ. 2 s |
| Device mains fuse | 4 A internal (device protection), slow-blow |
| Recommended breaker for input protection | 6 A ... 20 A (Characteristics B, C, D, K) |
| Discharge current to PE | < 3.5 mA |
| DC operation | |
| Input voltage range | 100 V DC ... 250 V DC -10 % ... +10 % |
| Voltage type of supply voltage | DC |
| Current consumption | 0.22 A (100 V DC) |
| 0.09 A (250 V DC) | |
| Efficiency | > 86 % (120 V AC) |
| > 86 % (230 V AC) | |
| Nominal output voltage | 30 V DC |
| Nominal output current (IN) | 640 mA () |
| Short-circuit-proof | yes |
| Derating | > 45 °C ... 70 °C (2 % / K) |
| Crest factor | typ. 3.4 |
| typ. 4.08 | |
| Output power (PN) | 19.2 W |
| Connection in parallel | yes, 2 |
| Connection in series | no |
| Feedback voltage resistance | 35 V DC |
| Protection against overvoltage at the output (OVP) | 35 V DC |
| Residual ripple | typ. 100 mVPP |
| Control deviation | < 0.5 % (Static load change 10 % ... 90 %) |
| < 3 % (Dynamic load change 10 % ... 90 %, (10 Hz)) | |
| < 0.1 % (change in input voltage ±10 %) | |
| Rise time | typ. 100 ms (UOut = 10 % ... 90 %) |
| Minimum no-load power dissipation | < 0.5 W (120 V AC) |
| Maximum no-load power dissipation | < 0.5 W (230 V AC) |
| Minimum nominal load power dissipation | 3 W (120 V AC) |
| Power loss nominal load max. | 3 W (230 V AC) |
| Integrated fuse protection | no |
| Nominal output voltage | 30 V DC |
| Nominal output current (IN) | 640 mA () |
| Short-circuit-proof | yes |
| Output power (PN) | 19.2 W |
| Connection in parallel | yes, for increased efficiency and redundancy |
| Connection in series | no |
| Feedback voltage resistance | 35 V DC |
| Protection against overvoltage at the output (OVP) | 35 V DC |
| Residual ripple | typ. 100 mVPP |
| Rise time | typ. 100 ms |
| LED signaling | |
| Types of signaling | LED DC OK AUX |
| Function | Visual operating state display |
| Color | green |
| LED off | < 24 V DC (Off) |
| LED on (green), DC OK | > 24 V DC (lit) |
| LED signaling | |
| Types of signaling | Display DC OK BUS |
| Function | Visual operating state display |
| Color | red, yellow, green (multicolor LED) |
| LED on (green), DC OK | 28 V DC UOUT 31 V DC (LED lights up green) |
| LED signaling | |
| Types of signaling | Display bar graph |
| Function | Visual operating state display |
| Color | red, yellow, green |
| LED signaling | |
| Types of signaling | Display temperature LED |
| Function | Visual operating state display |
| Color | red, green |
| Number of phases | 1 |
| Insulation voltage input/output | 4 kV AC (type test) |
| 3.75 kV AC (routine test) |
| Product type | Bus power supply |
| Product family | STEP POWER |
| MTBF (IEC 61709, SN 29500) | > 1718000 h (25 °C) |
| > 1052000 h (40 °C) | |
| > 750000 h (50 °C) | |
| Insulation characteristics | |
| Protection class | I |
| Degree of pollution | 2 |
| Life expectancy (electrolytic capacitors) | |
| Temperature | 40 °C |
| Time | 87600 h |
| Life expectancy (electrolytic capacitors) | |
| Temperature | 40 °C |
| Time | 87600 h |
| Item dimensions | |
| Width | 54 mm |
| Height | 90 mm |
| Depth | 61 mm |
| 55 mm (Device depth (DIN rail mounting)) | |
| Dimensional drawing |
|
| Horizontal pitch | 3 Div. (DIN 43880) |
| Installation dimensions | |
| Installation distance right/left | 0 mm / 0 mm |
| Installation distance top/bottom | 30 mm / 30 mm |
| Mounting type | DIN rail or direct mounting |
| Assembly note | alignable: 0 mm horizontally, 30 mm vertically |
| Mounting position | horizontal DIN rail NS 35, EN 60715 |
| With protective coating | no |
| Flammability rating according to UL 94 | V0 (Housing, terminal blocks, base latches) |
| Housing material | Plastic |
| Housing material | PC |
| Foot latch material | Polyamid |
| Ambient conditions | |
| Degree of protection | IP20 |
| Ambient temperature (operation) | -10 °C ... 70 °C (Derating > 45 °C: 2 %/K) |
| Ambient temperature (storage/transport) | -30 °C ... 80 °C |
| Ambient temperature (start-up type tested) | -25 °C |
| Maximum altitude | ≤ 5000 m (> 2000 m, Derating: 10 %/1000 m) |
| Max. permissible relative humidity (operation) | ≤ 95 % (non-condensing) |
| Shock (operation) | 18 ms, 30g, per spatial direction (IEC 60068-2-27) |
| Vibration (operation) | < 15 Hz, amplitude ±2.5 mm (IEC 60068-2-6) |
| 15 Hz ... 150 Hz, 2.3g, 90 min. | |
| Overvoltage category | |
| EN 61010-2-201 | II (≤ 5000 m) |
| Overvoltage category | |
| EN 62477-1 | III (≤ 2000 m) |
| IEC 60664-1 | III (≤ 2000 m) |
| IEC 63044-3 | III (≤ 2000 m) |
| Electrical safety | |
| Standard designation | Electrical safety |
| Standards/specifications | IEC 61010-1 (SELV) |
| Protective extra-low voltage | |
| Standard designation | Protective extra-low voltage |
| Standards/specifications | IEC 61010-1 (SELV) |
| IEC 61010-2-201 (PELV) | |
| Safe isolation | |
| Standard designation | Safe isolation |
| Standards/specifications | IEC 61558-2-16 |
| Electrical safety | |
| Standard designation | Home and Building Electronic Systems (HBES) and Building Automation and Control Systems (BACS): General Requirements |
| Standards/specifications | IEC 63044-3 |
| Safety requirements for electrical equipment for measurement, control, and laboratory use | |
| Standard designation | Safety requirements for electrical equipment for measurement, control, and laboratory use |
| Standards/specifications | IEC 61010-1 |
| Standards/specifications | IEC 14543-3 |
| UL | |
| Identification | UL/C-UL Listed UL 61010-1 |
| UL | |
| Identification | UL/C-UL Listed UL 61010-2-201 |
| Electromagnetic compatibility | Conformance with EMC Directive 2014/30/EU |
| Low Voltage Directive | Conformance with Low Voltage Directive 2014/35/EC |
| Interference emission | Interference emission in accordance with EN 61000-6-3 (residential and commercial) and EN 61000-6-4 (industrial) |
| Noise immunity | EN 61000-6-2:2005 |
| Conducted noise emission | |
| Standards/regulations | EN 55016 |
| EN 61000-6-3 (Class B) | |
| Noise emission | |
| Standards/regulations | EN 55016 |
| EN 61000-6-3 (Class B) | |
| Harmonic currents | |
| Standards/regulations | EN 61000-3-2 |
| EN 61000-3-2 (Class A) | |
| Flicker | |
| Standards/regulations | EN 61000-3-3 |
| Frequency range | 0 kHz ... 2 kHz |
| Electrostatic discharge | |
| Standards/regulations | EN 61000-4-2 |
| Electrostatic discharge | |
| Contact discharge | 6 kV (Test Level 3) |
| Discharge in air | 8 kV (Test Level 3) |
| Comments | Criterion A |
| Electromagnetic HF field | |
| Standards/regulations | EN 61000-4-3 |
| Electromagnetic HF field | |
| Frequency range | 80 MHz ... 1 GHz |
| Test field strength | 10 V/m (Test Level 3) |
| Frequency range | 1 GHz ... 6 GHz |
| Test field strength | 10 V/m (Test Level 3) |
| Comments | Criterion A |
| Fast transients (burst) | |
| Standards/regulations | EN 61000-4-4 |
| Fast transients (burst) | |
| Input | asymmetrical 2 kV (Test Level 3) |
| Output | asymmetrical 1 kV (Test Level 2) |
| Comments | Criterion A |
| Surge voltage load (surge) | |
| Standards/regulations | EN 61000-4-5 |
| Surge voltage load (surge) | |
| Input | symmetrical 1 kV (Test Level 3) |
| asymmetrical 2 kV (Test Level 3) | |
| Output | asymmetrical 2 kV (Test Level 3) |
| Comments | Criterion A |
| Conducted interference | |
| Standards/regulations | EN 61000-4-6 |
| Conducted interference | |
| Input/Output | asymmetrical |
| Frequency range | 0.15 MHz ... 80 MHz |
| Comments | Criterion A |
| Voltage | 10 V (Test Level 3) |
| Voltage dips | |
| Standards/regulations | EN 61000-4-11 |
| Voltage | 230 V AC |
| Frequency | 50 Hz |
| Voltage dip | 70 % |
| Number of periods | 25 periods |
| Additional text | Class 3 |
| Comments | Criterion A |
| Voltage dip | 40 % |
| Number of periods | 10 periods |
| Additional text | Class 3 |
| Comments | Criterion A |
| Voltage dip | 0 % |
| Number of periods | 1 period |
| Additional text | Class 3 |
| Comments | Criterion A |
| Criteria | |
| Criterion A | Normal operating behavior within the specified limits. |
| Criterion B | Temporary impairment to operational behavior that is corrected by the device itself. |
| Criterion C | Temporary adverse effects on the operating behavior, which the device corrects automatically or which can be restored by actuating the operating elements. |
cULus Listed
Approval ID: E123528-20240313IECEE CB Scheme
Approval ID: SI-11391IECEE CB Scheme
Approval ID: SI-11087
Your advantages
Easy analysis, thanks to integrated color display - all relevant KNX status information at a glance
History can be called up as diagnostic values in the menu
Unique dynamic KNX choke circuit for greater efficiency
Space-saving, thanks to the compact design
Worldwide use, thanks to AC and DC wide range input