Application Scenarios
Consider a mid-sized packaging machinery manufacturer designing a new line of carton erectors. The previous design relied on a bulky, inefficient linear power supply that generated excessive heat, required large cabinets, and struggled to handle simultaneous startups of multiple pneumatic valves and servo drives. By switching to the Siemens 6EP1332-2BA20, the engineering team reduced the control cabinet footprint by 60% and eliminated heat-related derating issues. The power boost function of the 6EP1332-2BA20 delivers 1.5 times the rated current for 5 seconds, allowing all actuators to start simultaneously without voltage sag, while the 120% continuous overload capacity provides headroom for future machine expansions without replacing the power supply .
In a large automotive assembly plant, a control engineer was tasked with powering a distributed network of 24V sensors and I/O modules across a welding line. The challenge was to ensure stable voltage delivery despite fluctuating mains conditions and long cable runs. The 6EP1332-2BA20 solved this with its wide-range input (85–264V AC) that automatically compensates for voltage dips, and its adjustable output voltage (22.8–28V) that can be increased to overcome line drops . The integral signaling contact for “output voltage OK” was integrated into the plant’s SCADA system, enabling remote monitoring and predictive maintenance alerts—a feature that reduced unplanned downtime by 40% over six months.
Technical Specifications
| Parameter | Value/Description |
|---|---|
| Product Model | 6EP1332-2BA20 |
| Manufacturer | Siemens AG |
| Product Series | SITOP PSU100S / SITOP smart |
| Product Category | Single-Phase DIN Rail Switching Power Supply |
| Input Voltage | 85–132V AC / 170–264V AC (wide-range auto-select) |
| Output Voltage | 24V DC (adjustable 22.8–28V) |
| Output Current | 2.5A (nominal) |
| Output Power | 60W |
| Efficiency | ≥85% (typical) |
| Short-term Power Boost | 1.5× rated current for 5 seconds |
| Continuous Overload | 1.2× rated current up to 45°C |
| Protection Features | Short-circuit (SCP), Overvoltage (OVP), Overload (OPP) |
| Output Ripple | ≤150 mV peak-to-peak |
| Operating Temperature | -25°C to +70°C |
| Dimensions (W×H×D) | 32.5 × 125 × 120 mm |
| Mounting | Standard 35mm DIN Rail |
| Signaling | “Output Voltage OK” relay contact |
| MTBF | 1,804,044 hours |
| Approvals | CE, cULus, ATEX, GL (marine) |
| Country of Origin | Austria |
Technical Principles and Innovative Value
Innovation Point 1: Power Boost and Permanent Overload Capacity
Unlike conventional power supplies that shut down or derate during overload conditions, the Siemens 6EP1332-2BA20 features a unique “Extra Power” function. It delivers 1.5 times the rated current (3.75A) for up to 5 seconds during startup, easily handling capacitive loads, DC motors, and pneumatic valves that draw high inrush currents . Furthermore, the 6EP1332-2BA20 can operate continuously at 120% of rated power (3A) up to 45°C ambient temperature, providing valuable headroom for system expansions without requiring a larger power supply. This innovation reduces both initial engineering costs and future upgrade expenses.
Innovation Point 2: Ultra-Compact Design with No Lateral Clearance
The 6EP1332-2BA20 achieves a remarkable power density with its 32.5mm narrow profile, making it one of the most compact 60W power supplies in its class . Its innovative thermal design allows modules to be mounted side-by-side without requiring ventilation clearance, saving up to 40% of valuable DIN rail space compared to competing products . This design philosophy directly addresses a key pain point in control cabinet engineering—limited space—allowing more components in smaller enclosures.
Innovation Point 3: Comprehensive Monitoring and Integration
The 6EP1332-2BA20 includes a signaling contact (relay) that indicates “output voltage OK,” enabling seamless integration with plant monitoring systems . Unlike basic power supplies that offer only an LED indicator, the 6EP1332-2BA20 provides a dry contact output that can trigger alarms, initiate redundancy switching, or feed into PLC diagnostics. When paired with SITOP redundancy, buffer, or selectivity modules, the 6EP1332-2BA20 becomes the foundation of a highly available 24V power distribution system with full diagnostic visibility .
