Siemens 6EP1336-2BA10 — SITOP PSU100S 24V 20A Buying Guide

By Abdullah Zahid
12 min read
Siemens 6EP1336-2BA10 SITOP PSU100S 24V DC 20A DIN rail industrial power supply for automation control cabinets

Siemens 6EP1336-2BA10 SITOP PSU100S Single-phase AC 24VDC 20A Stabilized Power Supply — Specs, Price and Selection Guide

If you are evaluating the Siemens 6EP1336-2BA10 for a control cabinet build, a like-for-like replacement, or a new machine specification, the core decision comes down to three hard numbers: 24V DC output, 20A rated current, and a single-phase AC input that auto-ranges from 85 to 264V AC without any manual reconfiguration. The 6EP1336-2BA10 is a SITOP PSU100S series DIN rail power supply with an MTBF of 1,778,916 hours at 40°C, CE and cULus certifications, and galvanic isolation per EN 60950-1 — making it a direct fit for safety-critical automation cabinets in food, pharma, packaging, and machine tool environments worldwide.

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

Who Should Buy the 6EP1336-2BA10 — and Who Shouldn't

This supply is the correct choice when all of the following are true for your application:

  • Your load requires exactly 24V DC at up to 20A rated current (480W maximum output power)
  • Your input supply is single-phase AC at 120V or 230V — or any voltage within the 85 to 264V AC auto-range window
  • Your cabinet uses EN 60715 35x7.5/15mm DIN rail and screw-type terminal connections
  • Your target market or facility requires CE marking plus cULus listing (UL 508 / CSA C22.2 No. 107.1)
  • Your installation environment is a dry, ventilated industrial cabinet operating between 0°C and 70°C with natural convection cooling
  • Galvanic isolation between AC input and 24V DC output is a safety or compliance requirement

If your load requires output current above 24A, a DC voltage other than 24V, a three-phase AC input, or a panel-mount or surface-mount format, this model is not the correct fit — SITOP Smart 40A or 60A variants, or alternative SITOP SKUs for 12V or 48V output, should be evaluated instead.

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What the Siemens 6EP1336-2BA10 Actually Does in Your System

The Siemens 6EP1336-2BA10 is a stabilized single-phase AC-DC industrial power supply belonging to the SITOP PSU100S product line. Its primary role is converting mains AC voltage — anywhere from 85V to 264V AC on the input — into regulated 24V DC at 20A to power the control circuits inside an industrial cabinet. That includes PLCs, I/O modules, solenoid valves, safety relays, sensors, and any other 24V DC automation device that requires a stable, isolated DC supply.

The word stabilized is technically significant here. Unlike basic transformer-rectifier supplies, the 6EP1336-2BA10 actively regulates output voltage within 3% overall tolerance and holds voltage control precision to 0.5% on slow input variation and 1% on load variation. The soft-start function raises output voltage gradually — with a typical rise time of 50ms and a maximum of 500ms — eliminating the output overshoot that can stress capacitors, relays, and solenoid coils at power-on. Galvanic isolation between the AC input and the 24V DC output prevents ground loops and means a fault on the DC side cannot inject current back into the AC mains.

The integrated relay contact output provides a dry-contact "24V OK" signal (normally open, rated 50V DC / 0.3A) that can be wired directly to a PLC input or monitoring system — giving the controller live feedback on power supply status without any additional monitoring relay.

Typical System Architecture for the SITOP PSU100S

The 6EP1336-2BA10 sits between the site AC distribution panel and the 24V DC bus that feeds all low-voltage control devices in the cabinet. Here is where it fits in the typical signal and power chain:

  • Site AC panel (120V or 230V single-phase) feeds the supply through a branch circuit breaker or fused disconnect
  • The 6EP1336-2BA10 converts and regulates AC input to a stable 24V DC output rail via screw-type terminals on DIN rail
  • The 24V DC output bus distributes to PLC power supply inputs, I/O module rails, safety relays, solenoid drivers, and sensor loops
  • The relay contact "24V OK" output connects to a PLC digital input or supervisory panel for power loss alarming
  • An optional buffer module on the output bus maintains 24V DC during brief AC mains interruptions, bridging equipment during transitions

Industries and Applications Where the 6EP1336-2BA10 Is the Right Call

In food and beverage processing, the 6EP1336-2BA10 is commonly specified for conveyors, filling machines, and labeling lines where compliance audits require traceable MTBF documentation and current safety certifications. The 1,778,916-hour MTBF at 40°C and CE marking provide the evidence auditors request.

For machine tool OEMs and panel builders, the auto-range input from 85 to 264V AC eliminates the need to stock two inventory SKUs for domestic 120V and export 230V builds. One part number covers both configurations without any manual changeover.

In pharmaceutical production and municipal water treatment facilities where power supply failure causes costly process interruption, two 6EP1336-2BA10 units can be paralleled for up to approximately 40A combined output, providing basic redundancy without an external load-sharing circuit.

Automotive assembly and packaging equipment retrofits frequently use this model as a drop-in replacement for failed SITOP-equipped cabinets, where matching the original supply's physical footprint, DIN rail format, and certification marks matters as much as the electrical specification.

Application Typical Deployment
Food and Beverage Line Control 24V DC bus supply for filling, capping, and labeling machine PLC and I/O rack
Machine Tool Cabinet Primary 24V supply for CNC control voltage, solenoid valves, and status indicators
Pharmaceutical Production Redundant parallel pair in critical process control panels requiring documented MTBF and CE/UL marks
Legacy System Retrofit Like-for-like SITOP replacement in mixed 120/230V site where auto-range eliminates re-specification
Water Treatment and Municipal Infrastructure 24V DC supply for pump and valve control panels in outdoor-housed, climate-controlled enclosures
Packaging and Labeling Equipment OEM Single-unit 480W supply for servo drive 24V logic and sensor distribution in compact cabinet

Purchase-Decision Specifications at a Glance

Parameter Specification
Output Voltage (Rated) 24V DC (adjustable 24–28V via onboard potentiometer)
Rated Output Current 20A (24A to +45°C; derating 5% per Kelvin above +60°C)
Output Power 480W maximum
Input Voltage Range 85–264V AC, single-phase auto-range (rated at 120V or 230V)
Rated Input Current 7.5A at 120V AC / 3.5A at 230V AC
Efficiency 90%
MTBF at 40°C 1,778,916 hours
Operating Temperature 0°C to +70°C with natural convection cooling
Certifications CE (EN 60950-1), cULus (UL 508 / CSA C22.2 No. 107.1 File E197259), CB Certificate
Mounting / Connection DIN rail EN 60715 35x7.5/15mm snap mount / Screw-type terminals

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

6EP1336-2BA10 vs. Comparable SITOP Variants: Which One Do You Need?

Criteria 6EP1336-2BA10 Lower-Current SITOP Variant Higher-Current SITOP Smart Variant Alternative Voltage SITOP SKU
Output Voltage 24V DC 24V DC 24V DC 12V or 48V DC
Rated Output Current 20A 5A or 10A 40A or 60A Varies by model
Input Voltage Single-phase 85–264V AC auto-range Single-phase AC Single or three-phase AC Single-phase AC
Parallel Operation Up to 2 units Varies Yes (larger models) Varies
CE / cULus Certified Yes Yes (SITOP family) Yes (SITOP family) Yes (SITOP family)
Best Fit 20A 24V DC cabinet supply with auto-range input Smaller loads, lower current budgets High-current or redundant configurations above 24A Applications requiring non-24V DC bus voltage

If your load budget is 20A or below and your input is single-phase AC anywhere from 85 to 264V, the 6EP1336-2BA10 is the correct choice — check current availability at LeadTime.ca.

Expert Verdict: Reliability, Limits, and Procurement Reality

The Siemens 6EP1336-2BA10 earns its position as a go-to 24V DC supply for industrial cabinets because it solves three problems simultaneously: it handles global input voltage variation without any manual range switching, it delivers a documented MTBF of 1,778,916 hours at 40°C that satisfies maintenance managers and compliance auditors alike, and the soft-start plus galvanic isolation combination meaningfully reduces stress on downstream components. The integrated "24V OK" relay contact is a practical detail that saves an additional monitoring relay in most designs. At 90% efficiency with a 53W power loss at rated conditions, thermal planning is straightforward — the supply runs warm but within bounds for a naturally convected cabinet at up to 70°C.

Where this model has real limits: if your total 24V load exceeds 20A rated current (or 24A at temperatures up to +45°C), you are at the boundary of what a single unit can deliver before derating kicks in at 5% per Kelvin above +60°C. Do not attempt to use a single 6EP1336-2BA10 in an application sized for 30A or 40A continuous — the SITOP Smart 40A and 60A variants exist precisely for that need. Equally, if your application requires 12V or 48V DC output, or a three-phase AC input source, this SKU is not the correct product regardless of its other merits. The non-accessible T 10A fuse is a deliberate design choice for cabinet safety but means field fuse replacement is not a user-serviceable action — factor that into maintenance planning.

From a procurement standpoint, the 6EP1336-2BA10 is stocked by major industrial distributors worldwide and typical lead times run two to four weeks for standard orders, though supply chain conditions can extend that window. Volume pricing is available for OEM orders, and bundling with other SITOP accessories or cabinet components is worth discussing if you are placing a larger build order. 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 and verification steps for installing the 6EP1336-2BA10. Engineers requiring full terminal diagrams and torque specifications should refer to the Siemens SITOP PSU100S installation manual.

  • Mount the supply by snapping onto an EN 60715 35x7.5/15mm DIN rail and leave a minimum of 10mm clearance above the unit for natural convection airflow — do not obstruct cooling vents with adjacent components or cable bundles
  • Input terminals accept L1 (phase), N (neutral), and PE (protective earth) from a single-phase AC source; the supply auto-selects the correct range anywhere between 85V and 264V AC without manual switching
  • Output terminals provide +24V DC and -24V (0V return); the optional relay contact (normally open, 50V DC / 0.3A rated) for the "24V OK" signal connects to a PLC input or supervisory system if live power status monitoring is required
  • The T 10A input fuse is non-accessible by design — verify fuse presence before energizing but do not attempt field replacement; this is an internal protection element, not a service fuse
  • After energizing, confirm the green LED illuminates and measure DC output voltage across the output terminals — the value should fall within the 3% overall tolerance band; if voltage adjustment is needed, the onboard potentiometer covers the 24V to 28V range within the 480W power constraint

Parallel Operation and Redundancy Configuration

The 6EP1336-2BA10 supports parallel operation of up to two identical units for applications requiring combined output current above 20A or basic supply redundancy. Key points for parallel configuration:

  • Both units must be the same model — 6EP1336-2BA10 — to ensure matched output voltage and load-sharing behavior
  • Connect the +24V DC output terminals of both supplies together at a common bus bar or distribution terminal block; repeat for the -24V return conductors using adequately rated interconnect cable
  • Load sharing between paralleled units occurs automatically via internal feedback — no external load-share circuit or equalizing resistor is required for basic operation
  • Each supply retains its own non-accessible T 10A input fuse; both units should be monitored via their individual "24V OK" relay contacts for independent fault detection at the PLC level
  • An optional buffer module on the combined 24V DC output bus can maintain the output voltage during brief AC mains interruptions, which is particularly valuable in pump, compressor, and pharmaceutical process control applications

Wrong-Part Prevention Checklist Before You Order

Before placing a purchase order for the Siemens 6EP1336-2BA10, work through every item on this checklist. Each point corresponds to a real ordering error that causes project delays and return freight costs.

  1. Verify output voltage is exactly 24V DC, not 12V, 48V, or other industrial voltages
  2. Confirm rated output current minimum is 20A, not 10A or 5A (check datasheet current rating)
  3. Check input source voltage is 1-phase AC 120/230V with auto-range, not 3-phase or single fixed voltage
  4. Ensure DIN rail mounting type matches cabinet rail standard (EN 60715 35x7.5/15mm), not panel-mount or terminal-block mount
  5. Verify fuse protection type is T 10A (not accessible), not customer-replaceable field fuse
  6. Confirm galvanic isolation and leakage current specifications meet EN 60950-1 safety class for your application
  7. Check operating temperature range 0-70°C with natural convection cooling suits your cabinet environment

If any item on this list does not match your project requirements, contact the LeadTime.ca team to identify the correct SITOP variant before ordering.

Frequently Asked Questions

Can I adjust the output voltage of the 6EP1336-2BA10 above 24V?

Yes. An onboard potentiometer allows output voltage adjustment between 24V and 28V DC. The 480W maximum output power constraint still applies across this range, so at 28V the maximum available current is reduced accordingly. No external trim pot or additional hardware is required.

What does the MTBF figure of 1,778,916 hours actually mean for maintenance planning?

The MTBF of 1,778,916 hours is calculated at 40°C operating temperature and represents a statistical mean time between failures across a population of units — not a guaranteed service life for a single unit. In practical terms, it supports a maintenance planning assumption of very low failure probability over a typical machine service life and provides the documented reliability figure that pharmaceutical, food, and automotive compliance audits frequently require.

Does the 6EP1336-2BA10 have short-circuit protection, and does it restart automatically?

Yes. The output is short-circuit proof via electronic shutdown. When a short-circuit condition is detected, the supply shuts down and then attempts automatic restart — indicated by a maximum response delay of 1.5 seconds. The overcurrent at startup and during fault conditions is typically 35A. Overload capability is rated at 150% of rated output current for up to 5 seconds per minute.

Is the 6EP1336-2BA10 suitable for outdoor or wash-down environments?

No. The supply is designed for dry, ventilated industrial cabinets. An IP rating for wet or wash-down conditions is not specified for this product. The operating temperature range of 0°C to 70°C assumes an indoor, climate-controlled enclosure environment. Storage and transport temperatures extend to -40°C to +85°C, but those ratings apply to non-operational transit only.

What certifications does the 6EP1336-2BA10 carry, and are they sufficient for North American and European markets?

The supply carries CE marking per EN 60950-1, cULus listing under UL 508 and CSA C22.2 No. 107.1 (File E197259), a CB Certificate, and EMC compliance per EN 61000-6-2. The Safety Extra-Low Voltage (SELV) output per EN 60950-1 and EN 50178 covers both European and North American safety requirements for control voltage applications. ATEX and IECEx approvals are not included — this supply is not rated for hazardous area installation.

How much heat does the 6EP1336-2BA10 generate at full load, and how do I design for it?

At rated conditions (20A output, 480W), the supply dissipates a typical 53W as heat. Cabinet thermal design should account for this figure when calculating total enclosure heat load. Natural convection cooling is sufficient up to 70°C ambient, but the minimum 10mm clearance above the supply must be maintained and cooling vents must not be obstructed. Above +60°C, output current derates at 5% per Kelvin.

Why Order the 6EP1336-2BA10 from LeadTime.ca

  • LeadTime.ca ships the Siemens 6EP1336-2BA10 worldwide — no geographic restriction on order placement
  • Real-time stock and pricing are available directly on the product page, without requiring an account or quote request for standard quantities
  • Volume pricing and OEM order bundling are available — contact the team for multi-unit or project-level orders
  • The LeadTime.ca team can confirm lead time, verify part number accuracy, and source hard-to-find SITOP accessories before you commit to a build schedule

At-a-Glance Summary

  • Model: Siemens 6EP1336-2BA10 — SITOP PSU100S Single-phase AC 24VDC 20A Stabilized Power Supply
  • Output: 24V DC regulated, 20A rated current, 480W maximum output power; adjustable to 28V via onboard potentiometer
  • Input: 85–264V AC single-phase auto-range; rated at 120V (7.5A input) and 230V (3.5A input)
  • MTBF: 1,778,916 hours at 40°C — among the highest documented reliability figures in the 24V DIN rail supply category
  • Efficiency: 90%; power loss at rated conditions 53W typical
  • Soft-start: output voltage rise typical 50ms, maximum 500ms — zero overshoot on power-on
  • Protection: electronic short-circuit shutdown with automatic restart; overcurrent typical 35A; overload 150% rated for 5 seconds per minute
  • Certifications: CE (EN 60950-1), cULus (UL 508 / CSA C22.2 No. 107.1 File E197259), CB Certificate, EMC EN 61000-6-2
  • Isolation: galvanic isolation input to output; SELV output; leakage current maximum 3.5mA
  • Mounting: EN 60715 35x7.5/15mm DIN rail snap mount; screw-type terminals; green LED and relay contact "24V OK" output (50V DC / 0.3A)
  • Operating temperature: 0°C to +70°C natural convection; storage and transport -40°C to +85°C
  • Parallel operation: up to 2 identical units for combined output capacity; automatic load sharing with no external circuit required
  • Not suitable for: output current above 24A, 12V or 48V DC applications, three-phase AC input, hazardous area (no ATEX/IECEx), or wet/wash-down environments