Siemens 6EP1334-1LB00 — SITOP PSU100L 24V 10A Buying Guide

By Abdullah Zahid
11 min read
Siemens 6EP1334-1LB00 SITOP PSU100L 24V 10A stabilized power supply DIN rail mount for industrial automation cabinets

Siemens 6EP1334-1LB00 SITOP PSU100L 24 V/10 A Stabilized Power Supply: Specifications, Selection Guide and Alternatives

If you are specifying a 24V DC power source for a PLC cabinet, a distributed I/O rack, or a bank of sensors and solenoids, the Siemens 6EP1334-1LB00 is likely already on your shortlist. This SITOP PSU100L 24 V/10 A Stabilized power supply delivers 240W of galvanically isolated, regulated DC output from a 120V or 230V AC single-phase feed, mounts on a standard DIN rail in a 70mm-wide footprint, and carries CE, UL, EAC, and CB certifications. The decision most engineers arrive at this page to confirm is whether 10A is enough headroom for their specific load list — and whether the single-phase input, IP20 enclosure, and 20ms bridge time match the site conditions.

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 6EP1334-1LB00 — and Who Shouldn't

This supply is the right choice for engineers and procurement specialists who can confirm all of the following:

  • Output current demand does not exceed 10A nominal at 24V DC (240W total load, including all connected modules, sensors, and actuators)
  • Site AC supply is single-phase 120V or 230V AC at 47–63 Hz — three-phase input is not supported
  • Cabinet ambient temperature stays within 0–60°C under operating conditions (thermal derating of 2%/K applies above 60°C)
  • DIN rail space of 70mm width is available in the enclosure
  • Output voltage tolerance of ±3% (adjustable 22.8–26.4V) is acceptable for all connected loads
  • No integrated UPS buffering beyond 20ms is required — a separate SITOP UPS module is needed for longer ride-through

If your load exceeds 10A continuous, the 6EP1334-2LB00 at 20A/480W in the same DIN rail form factor is the correct upgrade path. If you need backup power during mains loss beyond 20ms, pair this unit with a SITOP UPS module rather than specifying a different base supply.

On this page:

What the Siemens 6EP1334-1LB00 Actually Does in a Control System

The Siemens 6EP1334-1LB00 is an AC-DC switched-mode power supply in the SITOP PSU100L family. Its job in a control system is straightforward: convert facility AC power — 120V or 230V single-phase at 47–63 Hz — into a stable, galvanically isolated 24V DC rail that feeds PLCs, I/O modules, safety controllers, proximity sensors, solenoid valves, and indicator loads. The output is regulated to ±3% tolerance across the full input voltage and load range, with an adjustable potentiometer that lets you trim the output anywhere between 22.8V and 26.4V without swapping hardware.

What differentiates this unit from a basic industrial supply is its constant current short-circuit protection. Rather than latching off on a fault, the 6EP1334-1LB00 limits output current to a nominal 16A (12.6A RMS enduring) and holds that state until the fault clears. This behavior avoids nuisance shutdowns on inrush-heavy loads and protects downstream wiring without requiring manual reset in most cases. Add a published MTBF of 2,333,396 hours at 40°C and galvanic isolation per EN 60950-1 Safety Extra-Low Voltage (SELV) requirements, and you have a supply that control engineers have been specifying into standard automation cabinets for good reason.

Typical System Architecture: Where This Supply Sits in the Signal Chain

The 6EP1334-1LB00 sits at the top of the 24V DC distribution layer in a control cabinet, sitting between the facility AC feed and every low-voltage device downstream. It is not a UPS and does not manage battery backup — it is the primary conversion point that everything else depends on.

  • Facility AC supply (120V or 230V single-phase) feeds through a branch circuit breaker to the supply's L, N, and PE screw terminals
  • The 6EP1334-1LB00 converts and regulates that feed to a stable 24V DC output rail at up to 10A
  • The 24V DC output feeds a terminal block or bus bar that distributes power to PLC CPU and I/O modules, safety relays, and distributed I/O terminals
  • Field devices — proximity sensors, solenoids, valve coils, indicator lights — receive their 24V supply from that same distribution rail
  • If extended ride-through is required, a SITOP UPS module is connected downstream of this supply and upstream of critical loads

Industries and Applications That Specify This Model

Discrete manufacturing lines are the most common deployment — automotive assembly, food packaging machinery, and general industrial machinery where a DIN rail cabinet needs a reliable 24V source for PLC modules, distributed I/O, and actuator coils. The compact 70mm width makes it practical in tight enclosures where every millimeter of rail space is planned.

Pharmaceutical production and laboratory automation specify this model for its SELV galvanic isolation and multi-market certifications (CE, UL, EAC, CB, BIS). When equipment needs to ship or operate across North America, Europe, and export markets, having all certifications in a single SKU reduces qualification work.

Retrofit and legacy system upgrades are a strong use case. Engineers replacing aging linear supplies gain switching efficiency and the same output voltage range without redesigning cabinet layouts — the DIN rail footprint and screw terminal sizing are consistent with standard cabinet wiring practices.

Remote automation nodes and IIoT edge installations benefit from the 47–63 Hz input frequency tolerance and the 2,333,396-hour MTBF figure, which translates to long service intervals in locations where maintenance access is infrequent.

Application Typical Deployment
Discrete manufacturing machine line Control cabinet 24V rail for PLC CPU, I/O modules, and safety controllers
Industrial sensor and actuator supply 24V distribution to proximity sensors, solenoid valves, and indicator lights
Pharmaceutical / laboratory automation SELV-isolated supply for multi-market certified equipment
Legacy linear supply retrofit Drop-in DIN rail replacement maintaining same voltage and terminal layout
Remote / IIoT automation node Long-MTBF primary supply for field-mounted automation panels
Modular SITOP UPS integration Primary supply upstream of SITOP UPS module for safety-critical loads

Siemens 6EP1334-1LB00 Specifications: What You Need to Make a Purchase Decision

Specification Value
Input Voltage 120V AC / 230V AC, single-phase, 47–63 Hz
Output Voltage (nominal / adjustable) 24V DC nominal / 22.8–26.4V via potentiometer
Output Current 10A nominal (0–10A range); derating 2%/K above 60°C ambient
Power Rating 240W at rated conditions
Output Voltage Regulation ±3% overall tolerance
Short-Circuit Protection Constant current limiting; typical 16A limit, 12.6A RMS enduring
Bridge / Buffering Time 20ms minimum at rated load (Vin 93/187V)
Operating Temperature 0–60°C ambient (natural convection, no fan)
Enclosure Protection IP20 (indoor, dry environments)
Certifications CE, UL, EAC, CB certificate, BIS (R-41183539)

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

6EP1334-1LB00 vs. Other SITOP PSU100L Variants: Which One Do You Actually Need?

Model Output Current Power Input Voltage Form Factor Best Use Case Typical Lead Time
6EP1332-1LB00 5A 120W 120/230V AC single-phase DIN rail 70mm Low-power, cost-sensitive applications 2–4 weeks
6EP1333-1LB00 7A 160W 120/230V AC single-phase DIN rail 70mm Mid-range compact installations 2–4 weeks
6EP1334-1LB00 (this model) 10A 240W 120/230V AC single-phase DIN rail 70mm Standard industrial automation 2–4 weeks
6EP1334-2LB00 20A 480W 120/230V AC single-phase DIN rail 70mm Higher current or future expansion 3–5 weeks

If your load list totals more than 10A at 24V DC — or if you are planning cabinet expansion — the 6EP1334-2LB00 delivers 20A and 480W in the same 70mm DIN rail footprint. Check current availability of the 6EP1334-1LB00 at LeadTime.ca and reach out if you need a comparison quote on the 20A variant.

Expert Verdict: Honest Assessment for Engineers and Procurement Specialists

The Siemens 6EP1334-1LB00 earns its place as the default 24V/10A SITOP selection for standard industrial cabinet builds. The 2,333,396-hour MTBF at 40°C is not a marketing figure — it reflects the reliability profile that makes SITOP supplies the first-choice specification for integrators who cannot afford field failures. The constant current short-circuit protection at a nominal 16A means the supply survives wiring faults and large inrush events without nuisance trips, which matters enormously in multi-device cabinets where a single lockout can affect an entire machine line. The SELV galvanic isolation per EN 60950-1 simultaneously improves noise immunity and satisfies safety compliance requirements for markets covered by CE, UL, EAC, and CB certification.

Where this unit has real limits: the 20ms bridge time at rated load is adequate for momentary mains sags but insufficient for any application requiring continued operation during a power outage. If your system includes safety PLCs, emergency shutdown valves, or any load that must remain powered through a grid interruption, a dedicated SITOP UPS module downstream of this supply is not optional — it is a design requirement. Similarly, if your combined 24V load exceeds 10A continuous, do not attempt to stretch this unit with derating margin arithmetic. The 6EP1334-2LB00 at 20A is the correct choice and shares the same mounting footprint. Finally, the IP20 rating restricts this supply to dry indoor cabinet environments — outdoor or wash-down installations require a different product class entirely.

From a procurement standpoint, the 6EP1334-1LB00 sits in the 2–4 week lead time window from authorized distributors globally. It is widely stocked precisely because it is the volume-shipping variant in the SITOP PSU100L family. If your project timeline is tight, it is worth confirming stock before committing to a build schedule. 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 6EP1334-1LB00 mounts on a standard DIN rail and terminates via screw terminals on both the AC input and 24V DC output sides. The following points cover the critical requirements and what to verify before energizing. Always consult the official Siemens installation manual for complete procedures and torque specifications.

  • The unit accepts single-phase AC only: connect Line (L), Neutral (N), and Protective Earth (PE) to the labeled input terminals using 0.5–2.5mm² single-core or stranded conductors; screw terminal torque range is 0.5–1.5 Nm — under-torquing causes intermittent dropout, over-torquing damages terminals
  • DC output terminals (+) and (–) accept the same 0.5–2.5mm² conductor range; confirm polarity before energizing to avoid reverse-biasing downstream devices
  • After energizing, the green LED indicator should illuminate within approximately 1.5 seconds maximum — no LED at power-on indicates a wiring or input fault
  • Output voltage can be trimmed between 22.8V and 26.4V using the front-accessible potentiometer with a small flat-blade screwdriver; measure with a DVM under typical operating load before finalizing the setpoint
  • Verify cabinet ambient temperature is within 0–60°C and that ventilation slots around the unit are unobstructed — the 6EP1334-1LB00 relies on natural convection and has no internal cooling fan

What Engineers Get Wrong When Ordering This Part

Before placing an order, work through this checklist verbatim. These are the most common wrong-part and wrong-installation errors associated with the 6EP1334-1LB00:

  1. Confirm input voltage availability at site (120V or 230V AC single-phase only; not 3-phase)
  2. Verify output current demand does not exceed 10A nominal (check all connected loads including future expansion)
  3. Check ambient operating temperature range 0-60°C matches installation location (no heated/cooled cabinet required)
  4. Confirm DIN rail space allocation: 70mm width required (check cabinet layout)
  5. Verify screw terminal conductor gauge compatible with available cabling (0.5-2.5mm² capacity)
  6. Confirm no requirement for integrated backup/buffering (20ms bridge time only; requires UPS module if longer buffer needed)
  7. Check that output isolation requirement exists or is acceptable (galvanic isolation is standard; cannot be removed)

If any item on this list raises a flag for your installation, contact the LeadTime.ca team to confirm the correct variant before ordering — or review the full product page for additional documentation links.

Frequently Asked Questions

Can the Siemens 6EP1334-1LB00 handle both 120V and 230V AC input without any modification or jumper change?

Yes. The 6EP1334-1LB00 accepts both 120V and 230V AC single-phase input at 47–63 Hz with no hardware modification, jumper, or selector switch required. The supply automatically adapts to the available input voltage within its rated range. Confirm your site supply is single-phase — three-phase input is not supported and will damage the unit.

What happens when output current exceeds 10A — does the supply latch off or does it recover automatically?

The 6EP1334-1LB00 uses constant current limiting rather than a latching shutdown. When output current exceeds the nominal 10A limit, the supply reduces output voltage while maintaining the current limit at a typical 16A (12.6A RMS enduring). Once the overload or short circuit clears, the supply returns to normal regulation. In severe fault conditions, a power cycle of the AC input may be required to restore operation.

Is the 20ms bridge time sufficient for a PLC system during a brief mains interruption?

The 20ms minimum bridge time at rated load covers many brief mains sags and zero-crossing dropouts, but it is not sufficient for applications where the PLC or safety controller must complete a controlled shutdown or remain powered through an extended outage. For those requirements, a SITOP UPS module connected downstream of the 6EP1334-1LB00 is the correct solution. The 6EP1334-1LB00 is specifically not a UPS device.

What is the output ripple of the 6EP1334-1LB00 and does it affect sensitive instrumentation?

Residual ripple is specified at 50mV typical and 150mV maximum peak-to-peak. For standard PLC, I/O, and actuator loads this is well within acceptable limits. For highly sensitive analog instrumentation or precision measurement devices, verify the downstream equipment's input ripple rejection specification against the 150mV maximum figure. Additional output filtering capacitance can reduce ripple further if required by the application.

How does the 2%/K thermal derating above 60°C affect real cabinet sizing decisions?

At 70°C ambient — a realistic worst-case in a sealed enclosure near heat-generating equipment — the effective output current drops by approximately 2% per degree above 60°C, so 10 degrees of excess equals a roughly 2A reduction in usable output. If your cabinet regularly exceeds 60°C, either add ventilation to bring the ambient below the threshold or upsize to the 6EP1334-2LB00 at 20A to maintain adequate margin at elevated temperatures.

Does the 6EP1334-1LB00 carry the certifications needed for equipment shipped to India and Eurasian Customs Union markets?

Yes. The 6EP1334-1LB00 carries BIS approval (registration R-41183539) for India and EAC approval for Eurasian Customs Union markets, in addition to CE, UL, and CB certificate. This multi-certification coverage in a single SKU simplifies compliance documentation for equipment exported across multiple regulatory jurisdictions.

Why Order the Siemens 6EP1334-1LB00 From LeadTime.ca

  • Ships worldwide — not limited to any single region or country
  • Authorized distributor channel for genuine Siemens product with manufacturer warranty support
  • Volume pricing available for project quantities — contact the team for a project quote before committing to a BOM
  • Lead time confirmation before order placement — useful when project schedules depend on confirmed delivery windows
  • Sourcing support for related SITOP family parts, including UPS modules and alternative current ratings

At-a-Glance Summary: Siemens 6EP1334-1LB00

  • SITOP PSU100L 24 V/10 A Stabilized power supply — 240W output at regulated 24V DC
  • Input: 120V or 230V AC single-phase, 47–63 Hz — no jumper or modification required
  • Output adjustable 22.8–26.4V via front potentiometer; ±3% regulation across full load and input range
  • Constant current short-circuit protection at nominal 16A (12.6A RMS enduring) — no nuisance shutdown on transient faults
  • MTBF: 2,333,396 hours at 40°C — reflects industrial-grade reliability expectation
  • SELV galvanic isolation per EN 60950-1 — reduces noise coupling and satisfies safety compliance requirements
  • 20ms bridge time minimum at rated load — adequate for mains sags, not a UPS replacement
  • DIN rail mount, 70mm width × 125mm height × 120mm depth — screw terminals accept 0.5–2.5mm² conductors
  • IP20 protection class — indoor dry cabinet use only; 0–60°C operating range, 2%/K derating above 60°C
  • Certifications: CE, UL, EAC, CB certificate, BIS (R-41183539) — covers North American, European, and export markets
  • Typical lead time: 2–4 weeks from authorized distributors worldwide