Siemens 6EP1336-2BA00 Original Industrial Spare SITOP PSU100S Compatible

Product Overview

Siemens 6EP1336-2BA00 Original Industrial Spare SITOP PSU100S Compatible: System Stability & Industrial Spare Maintenance Value

In modern industrial automation environments, power supply reliability is the foundation of every control system. The Siemens 6EP1336-2BA00 — part of the renowned SITOP PSU100S series — is a 240 W single-phase DIN rail power supply engineered for continuous-duty industrial applications. Whether you are managing a Siemens S7-300, S7-400, or a distributed I/O cabinet, this unit delivers the stable 24 VDC output that your PLCs, field devices, and communication modules depend on around the clock.

For maintenance engineers and procurement teams, sourcing an original 6EP1336-2BA00 is not simply a replacement decision — it is a system stability decision. Counterfeit or non-original power supplies introduce voltage ripple, thermal drift, and premature failure risk that can cascade into unplanned downtime across an entire production line. Stocking a verified original spare eliminates that risk and keeps your maintenance cycle predictable.

Critical Technical Specs

Preventive Maintenance Strategy

A scheduled power supply inspection is the single highest-leverage activity in any PLC cabinet maintenance program. When your maintenance team opens a control cabinet for a routine inspection or an unplanned fault, the 6EP1336-2BA00 should never be evaluated in isolation. Power supply degradation rarely occurs in a vacuum — it is almost always accompanied by stress on adjacent components sharing the same 24 VDC bus.

During any inspection involving the SITOP PSU100S, engineers should simultaneously verify the condition of the Siemens 6ES7321 digital input modules and 6ES7322 digital output modules connected downstream. These S7-300 I/O modules draw directly from the 24 VDC rail and are the first components to exhibit erratic behavior when supply voltage drifts outside tolerance. A replacement power supply paired with aging I/O modules is a half-measure that will return the system to the maintenance queue within months.

Equally important is the condition of the 24 VDC distribution terminal blocks and fuse terminal modules — such as the Siemens 8WH series or equivalent Phoenix Contact PTFIX distribution blocks — that route power from the PSU to individual field circuits. Corroded or loose terminals create localized voltage drops that mimic power supply failure and are frequently misdiagnosed. Replacing the 6EP1336-2BA00 without inspecting the terminal rail is a common and costly mistake in cabinet maintenance.

For systems running PROFIBUS DP or PROFINET IO, the Siemens CP 343-1 or CP 443-1 communication processors should be checked for firmware currency and connector integrity during the same maintenance window. Communication modules are sensitive to power quality and are often the first to log diagnostic errors when a power supply begins to age. Proactively verifying these modules alongside the PSU replacement prevents a second maintenance event within the same quarter.

If your cabinet includes a Siemens IM 360/361 interface module for multi-rack S7-300 expansion, inspect the backplane bus connectors and the rack power distribution at the same time. Expansion racks that share a common power supply are particularly vulnerable to cascading failures when the primary PSU degrades. Stocking a spare 6EP1336-2BA00 alongside a spare IM 361 interface module is a recognized best practice in multi-rack S7-300 installations.

Cabinets that include Siemens LOGO! 24 VDC relay output modules, 3RK1 motor starter modules, or Siemens 3RT contactor assemblies introduce inrush current profiles that must be re-validated after any PSU replacement. The SITOP PSU100S series is rated for high inrush loads, but verifying that the new unit’s output characteristics match the load profile of your specific cabinet configuration is a critical commissioning step that is often skipped in emergency replacement scenarios. Additionally, Siemens 6GK7 SCALANCE network switches installed in the same cabinet should be checked for power rail integrity, as these devices are sensitive to micro-interruptions during PSU changeover.

For facilities running legacy Siemens S7-400 systems with PS 405 or PS 407 rack power supplies, the 6EP1336-2BA00 serves as the auxiliary 24 VDC system supply for field devices and HMI panels — including Siemens TP700 or TP900 Comfort Panel HMIs — that operate independently of the rack PSU. Scheduling HMI panel inspection and touch-screen calibration verification during the same maintenance window as a PSU replacement maximizes cabinet uptime and minimizes repeated access events.

Strategic Replacement Solutions

The Siemens 6EP1336-2BA00 is a direct replacement for earlier SITOP PSU100 variants including the 6EP1336-1SH01 and select 6EP1336-2BA10 configurations, subject to output current and housing dimension verification. For legacy S5 systems that have been migrated to S7-300 hardware, the SITOP PSU100S series provides a modern, high-efficiency alternative to older SITOP M power supplies, with improved EMC performance and a wider input voltage range that accommodates both 120 VAC and 230 VAC site power without manual switching.

In brownfield retrofit projects — where the goal is to extend the operational life of an existing S7-300 or S7-400 system by 5–10 years without a full PLC migration — replacing aging power supplies with original 6EP1336-2BA00 units is one of the most cost-effective interventions available. The alternative, a full CPU and rack replacement, typically costs 8–15× more and requires a complete I/O rewiring and software recommissioning cycle. A verified original PSU replacement, by contrast, can be completed during a planned 4-hour maintenance window with zero software changes.

For procurement teams managing multi-site industrial facilities, establishing a minimum stock level of one 6EP1336-2BA00 per production line — or per control cabinet cluster — is a standard recommendation in IEC 62443-compliant maintenance programs. The 12-month warranty provided by TOPNLMS on every unit means that your safety stock is not a sunk cost; it is a warranted asset that can be rotated into service with full confidence in its electrical integrity. Every unit is tested prior to dispatch, and a test report is available upon request for quality-critical procurement environments.

Support FAQ

Q1: Is the 6EP1336-2BA00 compatible with both S7-300 and S7-400 systems?
Yes. The 6EP1336-2BA00 outputs a regulated 24 VDC / 10 A supply suitable for powering S7-300 and S7-400 CPU racks, ET 200 distributed I/O stations, and any standard 24 VDC industrial load within its 240 W power budget. It is not a dedicated CPU rack power supply (PS 307/PS 405) but rather a system power supply for field devices, I/O modules, HMI panels, and auxiliary loads.

Q2: What pre-shipment testing does TOPNLMS perform on this unit?
Every 6EP1336-2BA00 dispatched by TOPNLMS undergoes output voltage calibration verification, load regulation testing at 50% and 100% rated load, and visual inspection for connector and housing integrity. Units sourced as tested surplus are additionally subjected to a 24-hour burn-in cycle before dispatch. A test report is available upon request for quality-critical procurement.

Q3: How do I verify compatibility before installation in my existing cabinet?
Confirm that your cabinet’s total 24 VDC load does not exceed 240 W (10 A). Measure the existing PSU’s output voltage under load and compare against the 6EP1336-2BA00’s adjustable output range (22.8–26.4 V). Check DIN rail clearance — the unit requires 75 mm width on a 35 mm DIN rail. If your existing PSU is a SITOP PSU100 or SITOP M variant, the 6EP1336-2BA00 is a form-fit-function replacement in the vast majority of S7-300 cabinet configurations.

Q4: What does the 12-month warranty cover and how is a claim processed?
The TOPNLMS 12-month warranty covers manufacturing defects and electrical failure under normal operating conditions. It does not cover damage resulting from incorrect installation, overvoltage events, or physical impact. To initiate a warranty claim, contact [email protected] with your order number, a description of the fault, and — where possible — output voltage and current readings at the time of failure. Replacement units are dispatched within 3 business days of claim approval.