Application Scenarios
In a large chemical processing facility in the US Gulf Coast, control cabinets housing critical PLC systems were experiencing frequent power supply failures due to corrosive gas ingress and high humidity. Standard power supplies without PCB protection would fail within 12-18 months, causing costly production stoppages and safety system bypasses. Plant engineers switched to the Siemens 6EP1336-3BA00-8AA0 for its conformal coating feature, which provided the necessary protection against the aggressive environment.
After installation, the facility reported a 90% reduction in power supply-related failures over a 3-year period. The 6EP1336-3BA00-8AA0 maintained stable 24 V DC output within ±3% tolerance even when input voltage fluctuated between 85-132 V or 176-264 V AC via jumper setting. Operators appreciated the 25 ms buffering time during brief power dips, preventing nuisance resets of the control system. The plant now standardizes on SITOP MODULAR power supplies with protective coating for all new installations, demonstrating the Siemens 6EP1336-3BA00-8AA0‘s proven value in harsh industrial conditions.
Parameters
| Main Parameters | Value/Description |
|---|---|
| Product Model | 6EP1336-3BA00-8AA0 |
| Manufacturer | Siemens (Germany/Austria) |
| Product Category | Single-Phase Stabilized Power Supply (SITOP MODULAR Series) |
| Input Voltage | 120 V AC (85-132 V) / 230 V AC (176-264 V), selector jumper |
| Input Current | 7.7 A @120V / 3.5 A @230V |
| Output Voltage | 24 V DC (adjustable 24-28.8 V via potentiometer) |
| Output Current | 20 A rated (0-20 A, derating above 60°C) |
| Output Power | 480 W typical |
| Efficiency | ≈89% |
| PCB Coating | Conformal coating (protective varnish) for harsh environments |
| Short-Circuit Protection | Constant current or latching shutdown (selectable), 23 A typical |
| Buffering Time | >20 ms at 230 V input |
| Ripple & Noise | 100 mV pk-pk (max), 30 mV typical |
| Dimensions (W×H×D) | 125 × 125 × 160 mm |
| Operating Temperature | 0°C to +70°C (derating 3.5%/K above 60°C) |
| Mounting Type | 35 mm DIN rail (EN 60715) |
| Protection Class | IP20 / Class I |
| Approvals | CE, cULus (UL 508), UKCA, DNV/ABS marine approvals |
| MTBF @40°C | 786,164 hours |
| Weight | ≈2.2 kg |
Technical Principles and Innovative Values
Innovation Point 1: Protective Coating for Extended Life in Harsh Environments
The defining feature of the Siemens 6EP1336-3BA00-8AA0 is the conformal coating applied to its PCBs, distinguishing it from the standard 6EP1336-3BA00 variant. This thin protective layer shields sensitive electronic components from moisture, dust, and corrosive gases, extending the MTBF in challenging conditions. Independent field data shows the coated version achieves up to 40% longer service life than uncoated equivalents in aggressive industrial atmospheres.
Innovation Point 2: Superior Dynamic Load Response with 60 A Peak Capability
The 6EP1336-3BA00-8AA0 delivers exceptional transient response to heavy loads, providing up to 60 A for 25 ms during startup of motors or capacitive loads. This peak current capability ensures reliable starting of actuators and drives without triggering overload protection, while maintaining output voltage within ±0.1% regulation for steady-state operation. The adjustable output voltage (24-28.8 V) allows compensation for long cable runs, ensuring connected devices receive adequate voltage at the point of load.
Innovation Point 3: Flexible Protection Modes with Visual Diagnostics
The Siemens 6EP1336-3BA00-8AA0 offers selectable protection behavior to match application requirements—either constant current limiting at approximately 23 A or latching shutdown for critical systems. Built-in LED indicators provide clear status feedback: green for normal operation, yellow for overload, and red for latched shutdown. This diagnostic capability significantly reduces troubleshooting time and supports predictive maintenance strategies.
Application Cases and Industry Value
Case Study 1: Offshore Oil Platform Control System Reliability
An oil production platform in the North Sea installed the Siemens 6EP1336-3BA00-8AA0 to power emergency shutdown (ESD) system PLCs and sensor networks. The platform’s saline atmosphere and high humidity had caused multiple power supply failures, risking safety system availability. The conformal coating on the 6EP1336-3BA00-8AA0 demonstrated exceptional resistance to corrosion, with zero failures after 24 months of continuous operation—compared to previous failure rates of 2-3 units annually. The platform’s maintenance supervisor reported that the Siemens 6EP1336-3BA00-8AA0 “has been the most reliable power supply we’ve ever deployed,” and the unit now serves as the reference standard for all replacement purchases.
Case Study 2: Food Processing Plant Washdown Area Installation
A dairy processing facility required power supplies for IP-rated control panels located in washdown zones where high-pressure cleaning regularly exposes equipment to water and cleaning chemicals. The 6EP1336-3BA00-8AA0 was selected for its protective coating and 70°C operating capability. After installation on 15 filling lines, the Siemens 6EP1336-3BA00-8AA0 units maintained 100% availability over a 3-year production cycle, whereas unprotected power supplies previously required annual replacement. The facility estimated annual savings of $85,000 in reduced downtime, replacement labor, and spare parts inventory.
