Image not available
Illustrative purposes only
1321105
AC/DC DIN Rail Power Supply (PSU), Hazardous Locations, Industrial & Laboratory Equipment
⚠️ Reference pricing provided. In case of supply shortages, we will connect you with our trusted procurement partners to ensure your project's continuity.
- Manufacturer: PHOENIX CONTACT
- Product type:
- SVHC: Lead (04-Feb-2026)
- Product Range: STEP POWER Series
- No. of Outputs: 1 Output
- Output Power Max: 90W
- Current, Output 4: -
- Input Voltage VAC: 100V AC to 240V AC
- Power Supply Output Type: Fixed
- Output Current - Output 1: 3.75A
- Output Current - Output 2: -
- Output Current - Output 3: -
- Output Voltage - Output 1: 24VDC
- Output Voltage - Output 2: -
- Output Voltage - Output 3: -
- Output Voltage - Output 4: -
- Power Supply Applications: Hazardous Locations, Industrial & Laboratory Equipment
| Delivery and price | |
|---|---|
| Units per pack | 50 |
| Price | 70.22 € |
| Current stock | 10+ |
| Lead time | 30 days |
Datasheet
## STEP3-PS/1AC/24DC/3.75/PT/CO - Power supply, ## with protective coating 1321105 https://www.phoenixcontact.com/de/produkte/1321105 Please be informed that the data shown in this PDF document is generated from our Online Catalog. Please find the complete data in the user documentation. Our General Terms of Use for Downloads are valid. Primary-switched power supply unit, STEP POWER, Push-in connection, DIN rail or direct mounting, with protective coating, input: 1-phase, output: 24 V DC / 3.75 A ## Product Description STEP POWER power supplies for distribution boards. The STEP POWER power supplies with Push-in connection technology are the professional solution for intelligent building automation. The compact devices are economical, space-saving, and flexible in application. ## Your advantages - - - - - - Energy savings with the highest level of efficiency in no-load and part-load operation (Efficiency Level VI) - Space savings in the control cabinet due to the narrow design combined with increased performance (up to 100%) - Approval for household purposes (EN 60335) allows use in domestic applications - Quick and easy startup with tool-free Push-in connection technology at a 45° angle with double terminal points - Flexible mounting: Snap onto a DIN rail or screw onto a level surface ## Commercial Data |Item number|1321105| |---|---| |Packing unit|1 pc| |Minimum order quantity|1 pc| |Sales Key|H1 - Stromversorgungen| |Product Key|CMPH13| |GTIN|4063151606923| |Weight per Piece (including packing)|263 g| |Weight per Piece (excluding packing)|230 g| |Customs tariff number|85044083| |Country of origin|VN| Aug 21, 2023, 4:27 AM Page 1 (18) ## STEP3-PS/1AC/24DC/3.75/PT/CO - Power supply, with protective coating 1321105 https://www.phoenixcontact.com/de/produkte/1321105 ## Technical Data ## Input data |put data|| |---|---| |AC operation|| |Network type|Star network| |Input voltage range|100 V AC ... 240 V AC -15 % ... +10 %| |Derating|< 100 V AC ... 85 V AC (1 %/V)| |Typical national grid voltage|120 V AC| ||230 V AC| |Voltage type of supply voltage|AC| |Inrush current|typ. 30 A (25 °C)| |Inrush current integral (I2t)|typ. 0.35 A2s| |Frequency range (fN)|50 Hz ... 60 Hz ±10 %| |Mains buffering time|typ. 25 ms (120 V AC)| ||typ. 25 ms (230 V AC)| |Current consumption|1 A (100 V AC)| ||0.45 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 ... 16 A (Characteristics B, C, D, K)| |Discharge current to PE|< 0.25 mA| |DC operation|| |Input voltage range|110 V DC ... 250 V DC -20 % ... +10 %| |Derating|< 110 V DC ... 88 V DC (1 %/V)| |Voltage type of supply voltage|DC| |Current consumption|0.88 A (110 V DC)| ||0.38 A (250 V DC)| ## Output data |Efficiency|> 92.5 % (120 V AC)| |---|---| ||> 94 % (230 V AC)| |Nominal output voltage|24 V DC| |Nominal output current (IN)|3.75 A| |Short-circuit-proof|yes| |No-load proof|yes| |Derating|> 50 °C ... 70 °C (2 % / K)| |Crest factor|typ. 1.78| ||typ. 1.87| |Output power (PN)|90 W| |Connection in parallel|yes, for increasing power and redundancy with diode| Aug 21, 2023, 4:27 AM Page 2 (18) ## STEP3-PS/1AC/24DC/3.75/PT/CO - Power supply, with protective coating ## 1321105 https://www.phoenixcontact.com/de/produkte/1321105 |Connection in series|yes, for increased output voltage| |---|---| |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|< 0.21 W (120 V AC)| |Maximum no-load power dissipation|< 0.21 W (230 V AC)| |Minimum nominal load power dissipation|< 7 W (120 V AC)| |Power loss nominal load max.|< 5.7 W (230 V AC)| |Integrated fuse protection|no| ## Connection data |onnection data|| |---|---| |Input|| |Position|1.x| |Conductor connection|| |Connection method|Push-in connection| |rigid|0.2 mm² ... 2.5 mm²| ||1 mm² (recommended)| |flexible|0.2 mm² ... 2.5 mm²| ||1 mm² (recommended)| |flexible with ferrule without plastic sleeve|0.5 mm² ... 1.5 mm²| ||1 mm² (recommended)| |flexible with ferrule with plastic sleeve|0.2 mm² ... 1 mm²| ||1 mm² (recommended)| |rigid (AWG)|24 ... 14 (Cu)| ||17 (recommended)| |Stripping length|10 mm (rigid/flexible)| ||10 mm (Ferrule)| |Output|| |Position|2.x| |Conductor connection|| |Connection method|Push-in connection| |rigid|0.2 mm² ... 2.5 mm²| ||1 mm² (recommended)| |flexible|0.2 mm² ... 2.5 mm²| ||1 mm² (recommended)| |flexible with ferrule without plastic sleeve|0.5 mm² ... 1.5 mm²| Aug 21, 2023, 4:27 AM Page 3 (18) ## STEP3-PS/1AC/24DC/3.75/PT/CO - Power supply, with protective coating ## 1321105 https://www.phoenixcontact.com/de/produkte/1321105 ||1 mm² (recommended)| |---|---| |flexible with ferrule with plastic sleeve|0.2 mm² ... 1 mm²| ||1 mm² (recommended)| |rigid (AWG)|24 ... 14 (Cu)| ||17 (recommended)| |Stripping length|10 mm (rigid/flexible)| ||10 mm (Ferrule)| ## Signaling |gnaling|| |---|---| |LED signaling|| |Types of signaling|LED DC OK – signal state operation (UN= 24 V DC, IOut= IN)| |Function|Visual operating state display| |Color|green| |LED off|Supply voltage input AC not present (Off)| |LED on (green), DC OK|UOut>0.9 x UN(UN= 24 V DC) (on)| |Signal threshold|> 0,9 x UN(UN= 24 V DC) (LED lights up green)| ||< 0,9 x UN(UN= 24 V DC) (LED off)| ## Electrical properties |ectrical properties|| |---|---| |Number of phases|1.00| |Insulation voltage input/output|4 kV AC (type test)| ||3.75 kV AC (routine test)| ## Product properties |roduct properties|| |---|---| |Product type|Power supply| |Product family|STEP POWER| |MTBF (IEC 61709, SN 29500)|> 2036000 h (25 °C)| ||> 1175000 h (40 °C)| ||> 777000 h (50 °C)| |Environmental protection directive|RoHS Directive 2011/65/EU| ||WEEE| ||Reach| |Insulation characteristics|| |Protection class|II (in closed control cabinet)| |Degree of pollution|2| |Insulation characteristics|| |---|---| |Protection class|II (in closed control cabinet)| |Degree of pollution|2| ## Dimensions |mensions|| |---|---| |Item dimensions|| |Width|72 mm| |Height|90 mm| |Depth|43 mm| Aug 21, 2023, 4:27 AM Page 4 (18) ## STEP3-PS/1AC/24DC/3.75/PT/CO - Power supply, with protective coating ## 1321105 https://www.phoenixcontact.com/de/produkte/1321105 ||37 mm (Device depth (DIN rail mounting))|37 mm (Device depth (DIN rail mounting))|37 mm (Device depth (DIN rail mounting))| |---|---|---|---| |Dimensional drawing|||| ||A<br>=|BH,|| ||HEHEAeA||'| |Horizontal pitch|4 Div. (DIN 43880)||| |Installation dimensions|||| |Installation distance right/left|0 mm / 0 mm||| |Installation distance top/bottom|30 mm / 30 mm||| ## Mounting |Mounting type|DIN rail or direct mounting| |---|---| |Assembly instructions|alignable: 0 mm horizontally, 30 mm vertically| |Mounting position|horizontal DIN rail NS 35, EN 60715| |With protective coating|PCB only| ||yes| ## Material specifications |Flammability rating according to UL 94|V0 (Housing, terminal blocks, base latches)| |---|---| |Housing material|Plastic| |Foot latch material|Polyamid| |Housing material|Polycarbonate| ## Environmental and real-life conditions Ambient conditions Degree of protection IP20 Ambient temperature (operation) -10 °C ... 70 °C (Derating > 50°C: 2 %/K) Ambient temperature (storage/transport) -40 °C ... 85 °C Ambient temperature (start-up type tested) -40 °C Maximum altitude ≤ 3000 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. ## Standards and regulations Overvoltage category EN 61010-1 II (≤ 3000 m) Aug 21, 2023, 4:27 AM Page 5 (18) ## STEP3-PS/1AC/24DC/3.75/PT/CO - Power supply, with protective coating ## 1321105 https://www.phoenixcontact.com/de/produkte/1321105 |Overvoltage category|| |---|---| |EN 62477-1|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| |Low-voltage power supplies, DC output|| |Standard designation|Low-voltage power supplies, DC output| |Standards/specifications|EN 61204-3| |Safety requirements for electrical equipment for measurement, control, and laboratory use|| |Standard designation<br>Safety requirements for electrical equipment for measurement,<br>control, and laboratory use|| |Standards/specifications<br>IEC 61010-1|| |Household and similar electrical appliances - Safety|| |Standard designation<br>Safety of electrical devices for household use and similar<br>purposes|| |Standards/specifications<br>DIN EN 60335-1|| |Electric vehicle conductive charging system - Part 21-2: EMC requirements for off board electric vehicle charging systems|| |Standard designation<br>Electric vehicle conductive charging system - Part 21-2: EMC<br>requirements for off board electric vehicle charging systems|| |Standards/specifications<br>IEC 61851-21-2|| |Note<br>Class B|| |pprovals|| |UL|| |Identification<br>UL 1310 Class 2 Power Units|| |UL|| |Identification<br>UL/C-UL Listed UL 61010-1|| |UL|| |Identification<br>UL/C-UL Listed UL 61010-2-201|| |UL|| ## Approvals Aug 21, 2023, 4:27 AM Page 6 (18) ## STEP3-PS/1AC/24DC/3.75/PT/CO - Power supply, with protective coating ## 1321105 https://www.phoenixcontact.com/de/produkte/1321105 |Identification|UL/C-UL Listed ANSI/UL 121201 Class I, Division 2, Groups A,<br>B, C, D (Hazardous Location)| |---|---| |MC data|| |Low Voltage Directive|Conformance with Low Voltage Directive 2014/35/EC| |Interference emission|Interference emission in accordance with EN 61000-6-3<br>(residential and commercial) and EN 61000-6-4 (industrial)| |Noise immunity|EN 61000-6-2:2005| |Electromagnetic compatibility|Conformance with EMC Directive 2014/30/EU| |Conducted noise emission|EN 55016| ||EN 61000-6-3 (Class B)| |Noise emission|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 4 kV (Test Level 4)| |Output|asymmetrical 2 kV (Test Level 3)| |Comments|Criterion A| ## EMC data Aug 21, 2023, 4:27 AM Page 7 (18) ## STEP3-PS/1AC/24DC/3.75/PT/CO - Power supply, with protective coating ## 1321105 https://www.phoenixcontact.com/de/produkte/1321105 |Surge voltage load (surge)|| |---|---| |Standards/regulations|EN 61000-4-5| |Input|symmetrical 2 kV (Test Level 4)| ||asymmetrical 4 kV (Test Level 4)| |Output|symmetrical 1 kV (Test Level 3)| ||asymmetrical 2 kV (Test Level 3)| |Comments|Criterion B| |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. Aug 21, 2023, 4:27 AM Page 8 (18) ## STEP3-PS/1AC/24DC/3.75/PT/CO - Power supply, with protective coating 1321105 https://www.phoenixcontact.com/de/produkte/1321105 ## Drawings Diagram **==> picture [402 x 220] intentionally omitted <==** **----- Start of picture text -----**<br> 1,0<br> 0,9 1<br> 0,8<br> 0,7<br>2<br> 0,6<br> 0,5<br> 0,4<br> 0,3<br> 0,2<br>1 = U : 120V AC/U : 24 V DC<br> 0,1 2 = UIn: 230V AC/UOut: 24 V DC<br>In Out<br> 0,0<br>0 1 2 3 4 5 6<br>IOut [A]<br> [A]<br>In<br>I<br>**----- End of picture text -----**<br> Input current/output current Aug 21, 2023, 4:27 AM Page 9 (18) STEP3-PS/1AC/24DC/3.75/PT/CO - Power supply, with protective coating 1321105 https://www.phoenixcontact.com/de/produkte/1321105 ## Dimensional drawing **==> picture [350 x 318] intentionally omitted <==** **----- Start of picture text -----**<br> 72<br>1.1 L 1.3N 2.1 + 2.3 + 2.5 − 2.7 −<br>1.2 L 1.4N 2.2 + 2.4 + 2.6 − 2.8 −<br>Input 1AC Output DC<br>class 2 output 24V 3.75A<br>DC OK<br>45<br>Ord.No.1321105<br>90<br>STEP POWER<br>**----- End of picture text -----**<br> Device dimensions (dimensions in mm) Aug 21, 2023, 4:27 AM Page 10 (18) ## STEP3-PS/1AC/24DC/3.75/PT/CO - Power supply, with protective coating 1321105 https://www.phoenixcontact.com/de/produkte/1321105 Diagram **==> picture [410 x 220] intentionally omitted <==** **----- Start of picture text -----**<br> 1,0<br> 0,9<br>1<br>2<br> 0,8<br> 0,7<br>1 = U : 120V AC/U : 24 V DC<br>In Out<br>2 = U : 230V AC/U : 24 V DC<br>In Out<br>0 0,5 1 1,5 2 2,5 3 3,5 4 4,5<br>IOut [A]<br>Power Factor<br>**----- End of picture text -----**<br> Power factor Schematic diagram ## **Housing** **==> picture [360 x 194] intentionally omitted <==** **----- Start of picture text -----**<br> Input Output<br>2.1<br>1.1 2.2<br>L<br>1.2 2.3 [+]<br>2.4<br>A 2.5<br>N1.3 2.6 -<br>1.4 2.7<br>2.8<br>**----- End of picture text -----**<br> Test sections, insulation voltage Aug 21, 2023, 4:27 AM Page 11 (18) ## STEP3-PS/1AC/24DC/3.75/PT/CO - Power supply, with protective coating 1321105 https://www.phoenixcontact.com/de/produkte/1321105 ## Schematic diagram **==> picture [75 x 222] intentionally omitted <==** **==> picture [194 x 167] intentionally omitted <==** ## **PUSH** Mounting option **==> picture [410 x 236] intentionally omitted <==** **----- Start of picture text -----**<br> Diagram<br> 120<br> 110<br> 100<br> 90<br> 80<br> 70<br> 60<br> 50 P 100 % 50 °C<br>N<br>0 1000 2000 3000 4000 5000<br>H [m]<br> [%]<br>Out<br>P<br>**----- End of picture text -----**<br> Output power/installation altitude Aug 21, 2023, 4:27 AM Page 12 (18) ## STEP3-PS/1AC/24DC/3.75/PT/CO - Power supply, with protective coating ## 1321105 https://www.phoenixcontact.com/de/produkte/1321105 **==> picture [412 x 237] intentionally omitted <==** **----- Start of picture text -----**<br> Block diagram<br>Input AC Output DC 2.1<br>2.2<br>+<br>1.1 2.3<br>L<br>1.2 active 2.4<br>Filter Filter<br>1.3 PFC 2.5<br>N<br>1.4 2.62.7 -<br>2.8<br>Functions User Interface<br>UVP OVP OTP OCP SCP<br>DC OK<br>**----- End of picture text -----**<br> Block diagram Aug 21, 2023, 4:27 AM Page 13 (18) STEP3-PS/1AC/24DC/3.75/PT/CO - Power supply, ## with protective coating 1321105 https://www.phoenixcontact.com/de/produkte/1321105 ## Dimensional drawing **==> picture [195 x 509] intentionally omitted <==** **----- Start of picture text -----**<br> 43<br>37<br>**----- End of picture text -----**<br> Device dimensions (dimensions in mm) Aug 21, 2023, 4:27 AM Page 14 (18) ## STEP3-PS/1AC/24DC/3.75/PT/CO - Power supply, with protective coating ## 1321105 https://www.phoenixcontact.com/de/produkte/1321105 **==> picture [364 x 237] intentionally omitted <==** **----- Start of picture text -----**<br> Diagram<br> 95<br> 90<br>1<br> 85<br>2<br> 80<br> 75 1 = UIn: 120V AC/UOut: 24 V DC<br>2 = U : 230V AC/U : 24 V DC<br>In Out<br> 70<br> 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0<br>IOut [A]<br>Eta [%]<br>**----- End of picture text -----**<br> Efficiency Aug 21, 2023, 4:27 AM Page 15 (18) ## STEP3-PS/1AC/24DC/3.75/PT/CO - Power supply, with protective coating 1321105 https://www.phoenixcontact.com/de/produkte/1321105 ## Approvals To download certificates, visit the product detail page: https://www.phoenixcontact.com/de/produkte/1321105 EAC Approval ID: RU S-DE.BL08.W.00764 Aug 21, 2023, 4:27 AM Page 16 (18) STEP3-PS/1AC/24DC/3.75/PT/CO - Power supply, with protective coating 1321105 https://www.phoenixcontact.com/de/produkte/1321105 ## Classifications ## ECLASS ||ECLASS-11.0|27040701| |---|---|---| ||ECLASS-12.0|27040701| ||ECLASS-13.0|27040701| ||IM|| ||ETIM 8.0|EC002540| ## ETIM Aug 21, 2023, 4:27 AM Page 17 (18) ## STEP3-PS/1AC/24DC/3.75/PT/CO - Power supply, with protective coating 1321105 https://www.phoenixcontact.com/de/produkte/1321105 ## Accessories STEP-DIODE/5-24DC/2X5/1X10 - Redundancy module 2868606 https://www.phoenixcontact.com/de/produkte/2868606 Redundancy module, 5 ... 24 V DC, 2x 5 A, 1x 10 A Phoenix Contact 2023 © - all rights reserved https://www.phoenixcontact.com PHOENIX CONTACT Deutschland GmbH Flachsmarktstraße 8 D-32825 Blomberg +49 52 35/3-1 20 00 info@phoenixcontact.de Aug 21, 2023, 4:27 AM Page 18 (18)
Updated at June 4, 2026
Phoenix Contact is a global leader in industrial connection technology, automation systems, and electronic interface solutions. With decades of engineering heritage originating in Germany, the company develops robust components designed to ensure reliable power, data, and signal transmission across demanding manufacturing and industrial environments. The cornerstone of the Phoenix Contact portfolio is its industry-leading selection of connection technologies. The range features an exceptional variety of terminal blocks, including pluggable headers and sockets, highly reliable wire-to-board solutions, and versatile DIN rail terminal blocks. These foundational connectivity components are supported by a comprehensive ecosystem of power distribution blocks, interface modules, marking systems, and accessories engineered for seamless control cabinet wiring. Beyond physical connectivity, Phoenix Contact provides critical components for advanced automation, control, and system protection. The wider offering encompasses a broad spectrum of process controllers, high-efficiency AC/DC converters, and a comprehensive suite of power, safety, and solid-state relays. From precision signal converters and electronic circuit breakers to fiber optic cable assemblies, Phoenix Contact equips engineers with the high-performance technologies required to build secure, highly efficient, and future-ready industrial systems.
About Novapart
Novapart is a B2B electronic component broker specialising in stock shortages and cost reduction. We source hard-to-find parts and identify compliant alternatives across a catalogue of 540,000+ components from 500+ manufacturers.
Learn more →Stock Shortage Specialist
When a component is unavailable, discontinued or has an unacceptable lead time, we tap into our network of vetted European and Asian distributors to source what you need — without compromising on quality or traceability.
Request a quote →Compliant Alternatives
We identify pin-to-pin, electrically equivalent substitutes that meet the same certifications (RoHS, AEC-Q100, REACH) as your original specification — validated against datasheets, not just part numbers. Often at a lower cost.
BOM Analysis service →