Siemens 6ES7307-1EA01-0AA0 — PS307 5A Phase-Out & Buying Guide

By Abdullah Zahid
12 min read
Siemens 6ES7307-1EA01-0AA0 SIMATIC PS307 24VDC 5A regulated power supply module for S7-300 PLC cabinets

Siemens 6ES7307-1EA01-0AA0 — SIMATIC PS307/1AC/24VDC/5A Power Supply: Specs, Wiring, and Alternatives

Controls engineers specifying or replacing power supplies in SIMATIC S7-300 automation systems frequently land on the Siemens 6ES7307-1EA01-0AA0 — the SIMATIC PS307/1AC/24VDC/5A — a single-phase regulated supply that converts 120/230 V AC mains to 24 V DC at 5 A continuous output, mounted directly on the S7 profile rail inside the control cabinet. The decision usually comes down to three questions: Is 5 A enough for the full system load? Does the cabinet have S7 rail? And does the phase-out status affect your long-term parts strategy? This review addresses all three directly.

If you have already confirmed this is the right part, check current pricing and availability at LeadTime.ca — ships worldwide.

Who Should Buy the Siemens 6ES7307-1EA01-0AA0 — and Who Shouldn't

The SIMATIC PS307/1AC/24VDC/5A is the correct choice if your application checks all of the following:

  • Your controller is a SIMATIC S7-300 (not S7-1200, S7-1500, or other series with different rail formats)
  • Your cabinet uses S7 profile rail mounting — DIN rail mounting is not supported by this model
  • Your total 24 V DC system load — CPU, I/O modules, solenoids, sensors, relays combined — stays within 5 A continuous
  • Your mains supply is 120 V or 230 V AC single phase, 50/60 Hz
  • The required compliance certifications for your market are CE, UL 508, CSA, UKCA, or EAC
  • The announced phase-out status is acceptable for your lifecycle and spares planning horizon

If your system load exceeds 5 A, you need the PS307 10 A or 20 A variant. If redundancy is mandatory, look at the PS307S switchover model. If you need long-term supply chain support without phase-out risk, evaluate the SITOP 6EP series — DIN rail mounted and actively produced.

On this page:

What the SIMATIC PS307/1AC/24VDC/5A Actually Does in an S7-300 System

The Siemens 6ES7307-1EA01-0AA0 is a regulated DC power supply module in the SIMATIC S7-300 product family. Its role is straightforward: take single-phase AC mains from the facility power system — 120 V or 230 V, auto-selected — and deliver a stable, regulated 24 V DC output at up to 5 A continuous to power the PLC controller, I/O modules, and 24 V DC field devices in the automation cabinet.

What separates this from a generic panel supply is its S7 rail mounting format, its integrated soft start with a maximum 2-second response delay, and its short-circuit withstand capability of 20 A for up to 100 ms — meaning a downstream wiring fault or solenoid inrush will not destroy the supply instantly. Electronic overvoltage protection triggers shutdown if output climbs above 28.8 V, with automatic restart, reducing the need for external suppression components. Output voltage regulation holds within ±3% across the full 0 to 5 A operating range, and load step response time is 0.3 ms between 50% and 100% load transitions. For most S7-300 machine control cabinets, that is more than adequate.

The enduring short-circuit RMS rating of 7 A means the supply can sustain a brief fault condition without immediate failure, giving upstream protection devices time to clear the fault before permanent damage occurs. Efficiency is rated at 88% typical, with active power consumption of 120 W at rated output. Output ripple is 10 mV typical with a 50 mV maximum, and voltage peaks are 20 mV typical with a 150 mV maximum — clean enough to operate sensitive PLC input cards reliably.

Typical S7-300 System Architecture: Where the PS307 Fits

The 6ES7307-1EA01-0AA0 sits at the top of the 24 V DC power chain in an S7-300 cabinet — directly between the AC mains disconnect and the PLC controller. It is always the first module to the left on the S7 profile rail.

  • Facility mains supply (120/230 V AC) → external 4 A mains breaker or fused disconnect upstream of PS307 input
  • PS307 input terminals (L, N, PE) → regulated 24 V DC at output terminals (L+, M)
  • PS307 output L+ and M → S7-300 CPU power input on S7 profile rail (right of PS307)
  • CPU backplane bus → S7-300 digital and analog I/O modules (mounted sequentially right of CPU on same S7 rail)
  • 24 V DC terminal block → field devices: solenoids, sensors, relays, indicators (all load current returns through this budget)

Industries and Applications That Use the 6ES7307-1EA01-0AA0

In manufacturing environments, the 6ES7307-1EA01-0AA0 appears most often in injection molding machine control cabinets, stamping press automation, and assembly line PLC panels — all applications where the total 24 V DC load from the CPU and a modest I/O count stays within the 5 A rating.

Material handling integrators use this supply in conveyor system control panels and automated storage and retrieval controllers, where the S7-300 architecture was specified years ago and the existing rail infrastructure makes the PS307 form factor a direct drop-in replacement when a supply fails in the field.

Food and beverage packaging and filling line builders commonly specify S7-300 with this power supply for its compact 60 × 125 × 120 mm footprint in space-constrained stainless-steel enclosures. Pharmaceutical lab automation, automotive sub-tier supplier cabinets, and water/wastewater SCADA panels round out the secondary application base.

The most frequent procurement trigger is a retrofit or emergency replacement: an existing PS307 has failed in a running machine, and the maintenance team needs an exact drop-in part. New panel builds for S7-300 systems and spare parts inventory stocking for multi-machine fleets are the next most common scenarios.

Application Typical Deployment
Injection Molding Machine Control PS307 5A powering S7-300 CPU + 4–6 digital I/O modules, total load under 4 A
Conveyor System PLC Panel Replacement for failed legacy PS307; direct S7 rail swap, no rewiring required
Packaging Line Cabinet Space-constrained enclosure; 60 mm PS307 width fits between adjacent modules
Spare Parts Inventory Maintenance team holding 1–2 units per machine fleet for emergency hot-swap
New S7-300 Panel Build Controls engineer specifying full S7-300 BOM; PS307 5A selected for standard-duty load
Pharmaceutical Lab Automation S7-300 with limited I/O; 5 A rating covers CPU + analog cards + two solenoid valves

Key Specifications: What Engineers Need to Make the Purchase Decision

Parameter Value
Input Voltage (Rated) 120 / 230 V AC (auto-select), single phase
Input Voltage Range 170 ... 264 V AC
Input Frequency 50 / 60 Hz
Output Voltage 24 V DC ± 3%
Rated Output Current 5 A (0 ... 5 A operating range)
Short-Circuit Withstand (Start-Up / Operation) 20 A for 100 ms; enduring short-circuit RMS 7 A
Overvoltage Protection Threshold <28.8 V (auto-restart)
Load Step Response Time 0.3 ms (50–100% and 100–50% load)
Dimensions (W × H × D) 60 × 125 × 120 mm
Operating Ambient Temperature 0 ... 60 °C (natural convection)

Full technical specifications are available on the product page at LeadTime.ca.

PS307 5A vs. 10A vs. SITOP — Which One Do You Actually Need?

Model / Type Output Rating Mounting Redundancy Phase-Out Typical Use
6ES7307-1EA01-0AA0 (PS307 5A) 24 V / 5 A S7 Rail No Announced Legacy S7-300, standard-duty load
PS307 10A variant 24 V / 10 A S7 Rail No Announced Higher load, same rail form factor
PS307S Switchover 24 V / 5 A each channel S7 Rail Yes (N+1) Announced Redundancy-critical systems
SITOP PSE100U (6EP7133-1BL00) 24 V / 10 A DIN Rail No Active Modern replacement, wider input range
SITOP PSE200U (6EP7211-1BD01-0BA1) 24 V / 2 / 4 A DIN Rail No Active Modular SITOP, compact

If your S7-300 cabinet uses S7 profile rail and your load is confirmed under 5 A, the 6ES7307-1EA01-0AA0 remains the cleanest drop-in option — check current stock and pricing at LeadTime.ca.

Expert Verdict: Honest Assessment for Controls Engineers and Buyers

The Siemens 6ES7307-1EA01-0AA0 earns its place in S7-300 cabinets because it eliminates the integration uncertainty that comes with generic third-party 24 V DC supplies. The S7 profile rail mounting is a genuine advantage in cabinets already designed around that form factor — no adapter plates, no rework, no wondering whether the alternative will hold current under heat. The integrated soft start, 20 A short-circuit withstand for 100 ms, and automatic overvoltage restart at 28.8 V mean the supply handles the inrush and fault transients that kill cheaper alternatives. The MTBF rating of 2,480,589 hours at 40 °C is a proof point that aligns with what long-running S7-300 installations actually experience in the field. For retrofit replacements and spare parts inventory on machines already running S7-300, this is the obvious choice.

Where it falls short is just as clear. The 5 A output is a hard ceiling — if your load budget comes out at 5.2 A once you add solenoids and relays, you will see voltage sag and unexpected PLC resets under load peaks. The current-limiting response activates between 5.5 and 6.5 A, which means the margin above 5 A is thin. The announced phase-out status is the other genuine concern: for new machine builds where you expect to source spare parts for 10 to 15 years, committing to a phase-out part creates real risk. In that scenario, the SITOP 6EP series is the right long-term answer even though it requires DIN rail mounting and minor cabinet modifications. For redundancy-critical panels, the PS307S is the correct variant, not this one.

On the procurement side, the phase-out status means current stocked inventory may not be replenished. If you are maintaining a fleet of S7-300 machines and have confirmed no transition to SITOP in your near-term roadmap, buying additional units now to cover 12 to 24 months of field replacements is a defensible strategy. Volume pricing and bundled S7-300 BOM quoting are both available at LeadTime.ca. If this matches your system requirements, view current stock and pricing at LeadTime.ca.

For volume pricing or to confirm lead time before committing to a build, contact the LeadTime.ca team directly — we ship worldwide.

Wiring and Installation Overview

The following points cover the key requirements for mounting and connecting the 6ES7307-1EA01-0AA0. For full installation procedures, refer to the Siemens SIMATIC PS307 installation manual.

  • Mount the PS307 to the left of the S7-300 CPU on the S7 profile rail; confirm 60 mm horizontal space is clear and 40 mm top-and-bottom clearance is maintained for natural convection airflow
  • AC mains input terminals (L, N, PE) accept 0.5–2.5 mm² single-core or finely stranded wire via screw terminal; 120 V and 230 V AC are auto-selected — no manual voltage switching required
  • Install an external 4 A mains breaker or fused disconnect upstream of the PS307 input before energizing — this is required by electrical code and protects the supply from upstream fault events
  • DC output terminals L+ and M each have three screw terminals (all electrically tied); connect the positive 24 V line to any L+ terminal and the common/ground to any M terminal; verify polarity before powering up — reversal can damage the CPU
  • After power-up, confirm the green LED illuminates within 2 seconds (soft start maximum delay); measure 24 V DC at the CPU input with a digital multimeter before proceeding with I/O wiring

Wrong-Part Prevention: Critical Checks Before You Order

Before submitting a purchase order for the Siemens 6ES7307-1EA01-0AA0, work through this checklist exactly as written — each item addresses a documented ordering mistake:

  1. Verify your S7 PLC controller model is S7-300 (not S7-1200, S7-1500, or other series; different rail formats)
  2. Confirm your cabinet uses S7 profile rail mounting; if DIN rail only, this PS307 model will not fit
  3. Check your total system load: Sum all 24 V DC currents from PLC, I/O modules, solenoids, sensors. If >5 A, select 10A or 20A variant
  4. Verify mains input voltage at your site: North American 120 V, European 230 V, or auto-switching 120/230. This model auto-selects; confirm no manual configuration needed
  5. Confirm operating ambient: This model rated 0–60 °C natural convection. If your enclosure exceeds 60 °C without cooling, consider forced-air variant or thermal management
  6. Check regulatory approvals for your region: CE for EU, UL 508 for North America, UKCA for UK, EAC for Russia/CIS
  7. Verify redundancy not required: This is single-channel. If N+1 power availability mandatory, upgrade to PS307S switchover version
  8. Ensure no external circuit breaker bypass required: This supply includes integrated electronic short-circuit protection; only external 4 A mains breaker or fused disconnect recommended per installation guide

If any item on this checklist raises a flag, contact the LeadTime.ca team to confirm the right variant before ordering — we ship worldwide and can help verify the correct part number for your system configuration.

Frequently Asked Questions

Is the 6ES7307-1EA01-0AA0 still available to buy, or has it been discontinued?

The Siemens 6ES7307-1EA01-0AA0 has Phase Out Announced status as of 2025, meaning Siemens has signaled end-of-sale but existing inventory is still distributed through authorized channels. Availability varies by distributor and region. If you need this specific part number for a retrofit or spare parts inventory, check current stock at LeadTime.ca and consider ordering a buffer quantity given the phase-out trajectory.

How do I know if 5 A is enough for my S7-300 system?

Build a 24 V DC load budget before ordering. A typical S7-300 CPU draws approximately 1.5 to 2 A; each digital I/O module adds 0.2 to 0.5 A; solenoid valves can draw 1 to 3 A each during actuation. Sum the maximum concurrent draw across all devices. If the total stays under 5 A with reasonable headroom, this supply is adequate. If the total approaches or exceeds 5 A, order the PS307 10 A variant instead — undersizing the power supply is the leading cause of unexplained PLC resets in the field.

Can I replace the 6ES7307-1EA01-0AA0 with a SITOP power supply?

Yes, but with a mounting caveat. The SITOP 6EP series is the recommended successor from Siemens and is actively produced with extended support. However, SITOP modules mount on DIN rail, not S7 profile rail, so a cabinet that is currently S7-rail-only will require a DIN rail section to be added. The electrical output — 24 V DC at the required current rating — is directly compatible with S7-300 power input requirements. For long-term new builds or fleet upgrades, the SITOP migration is the correct path.

Does this power supply include a built-in circuit breaker?

No. The 6ES7307-1EA01-0AA0 includes integrated electronic short-circuit protection with a 20 A withstand capability for 100 ms and an enduring short-circuit RMS rating of 7 A. It does not include a mechanical circuit breaker. An external 4 A mains breaker or fused disconnect switch upstream of the PS307 input is required by electrical installation code and is the buyer's responsibility to specify and install.

What happens if the output voltage exceeds the overvoltage threshold?

If output voltage rises above 28.8 V, the electronic overvoltage protection circuit shuts down the supply output automatically and then attempts an automatic restart. This protects downstream PLC and I/O modules from overvoltage damage. The most common cause of nuisance overvoltage trips is a transient load step — for example, a large solenoid bank de-energizing simultaneously and causing a voltage spike. If this occurs repeatedly, reviewing the load configuration and adding downstream capacitance may resolve it.

What certifications does the 6ES7307-1EA01-0AA0 carry for North American installations?

The supply carries UL 508 and CSA C22.2 No. 142 certification (cULus Listed, File E143289), CE mark for EU markets, UKCA for the UK, EAC for Russia and CIS markets, BIS for India (R-41183539), and a CB Certificate per IEC 61010. Leakage current is rated below 3.5 mA typical, supporting Class I installation requirements. For North American UL-listed panel builds, the UL 508 listing satisfies the most common inspector requirement.

Why Order the 6ES7307-1EA01-0AA0 from LeadTime.ca

  • LeadTime.ca ships worldwide — whether your panel shop is in Canada, the US, Europe, or anywhere else, sourcing is not restricted by region
  • Specializes in industrial automation hardware including hard-to-find and phase-out Siemens SIMATIC parts where general distributors show zero stock
  • Volume pricing available for maintenance teams stocking multiple units ahead of phase-out supply tightening
  • Fast response for quote and lead time confirmation — critical when a machine is down and you need a same-day answer

At-a-Glance Summary

  • Model: Siemens 6ES7307-1EA01-0AA0 — SIMATIC PS307/1AC/24VDC/5A regulated DC power supply
  • Output: 24 V DC ± 3%, 5 A continuous (0 to 5 A operating range)
  • Input: 120/230 V AC auto-select, single phase, 50/60 Hz, 170 to 264 V AC range
  • Short-circuit withstand: 20 A for 100 ms; enduring RMS 7 A; overvoltage shutdown at <28.8 V with auto-restart
  • Load step response: 0.3 ms; soft start maximum 2 s delay; efficiency 88% typical at 120 W active power
  • Dimensions: 60 × 125 × 120 mm; S7 profile rail mounting only; 40 mm top and bottom clearance required
  • Operating temperature: 0 to 60 °C natural convection; MTBF at 40 °C rated at 2,480,589 hours
  • Certifications: CE, UL 508, CSA C22.2 No. 142 (cULus File E143289), UKCA, EAC, BIS, CB Certificate
  • Status: Phase Out Announced as of 2025; successor path is Siemens SITOP 6EP series (DIN rail, actively produced)
  • Right for: S7-300 retrofits, spare parts stocking, new builds with confirmed load under 5 A and S7 rail cabinets
  • Not right for: Loads above 5 A, DIN-rail-only cabinets, redundancy-critical panels, long-horizon new builds requiring active production parts