Siemens 6EP3333-6SB00-0AY0 LOGO!POWER 24V 4A Stabilized Power Supply

Siemens 6EP3333-6SB00-0AY0 LOGO!POWER 24V 4A Stabilized Power Supply

The Siemens 6EP3333-6SB00-0AY0 is a compact, high-efficiency 24V DC power supply specifically designed for the LOGO! logic module family and small-scale automation applications. Delivering 96 watts of regulated power with universal AC input compatibility, this DIN rail-mounted unit provides reliable, stable voltage for PLCs, sensors, relays, and control circuits in building automation, machine control, and industrial monitoring systems.

Technical Specifications

• Model Number: 6EP3333-6SB00-0AY0
• Product Series: LOGO!POWER
• Output Voltage: 24V DC nominal (adjustable 24V to 28V)
• Output Current: 4A continuous (96W total power)
• Input Voltage Range: 100-240V AC (85-264V AC operating range)
• Input Frequency: 50/60 Hz (47-63 Hz operating range)
• Efficiency: >89% at full load (Energy Star compliant)
• Output Regulation: ±1% static, ±3% dynamic
• Ripple & Noise: <150mVpp (typical <50mVpp)
• Overload Protection: 105-150% rated output with automatic recovery
• Short Circuit Protection: Continuous short circuit capability with auto-restart
• Input Surge Protection: Integrated varistor for transient suppression
• Mounting: 35mm DIN rail (EN 60715 TH35)
• Dimensions: 72mm (W) x 90mm (H) x 58mm (D)
• Operating Temperature: -25°C to +70°C (-13°F to +158°F) with derating above 60°C
• Storage Temperature: -40°C to +85°C
• Humidity: 5% to 95% RH non-condensing
• Protection Class: IP20 enclosure
• Certifications: UL, cUL, CE, TÜV, CB, EAC, RCM
• MTBF: >500,000 hours at 25°C ambient

Design Philosophy & Performance

The LOGO!POWER series represents Siemens' commitment to delivering industrial-grade reliability in a space-efficient package. The 6EP3333-6SB00-0AY0 employs switch-mode topology with active power factor correction (PFC), achieving high efficiency while minimizing heat generation and energy consumption. This design reduces operating costs and extends component lifespan compared to traditional linear power supplies.

The wide input voltage range (100-240V AC) eliminates the need for manual voltage selection switches, simplifying installation and preventing configuration errors. Whether deployed in North American 120V systems, European 230V networks, or industrial facilities with fluctuating mains voltage, the power supply automatically adapts to deliver consistent 24V DC output.

Output voltage adjustment from 24V to 28V accommodates applications requiring slightly elevated voltage to compensate for cable voltage drop in long distribution runs. A precision potentiometer on the front panel allows fine-tuning without external tools, and the setting remains stable across temperature variations and load changes.

Application Scenarios

LOGO! Logic Module Systems: As the recommended power source for Siemens LOGO! controllers, this supply perfectly matches the 24V DC requirement of LOGO! 12/24RC, 12/24RCE, and 12/24RCO models. Its 4A capacity supports the base module plus multiple expansion modules, digital I/O, analog inputs, and communication interfaces without requiring additional power supplies.

Building Automation: HVAC control panels, lighting management systems, and access control installations benefit from the compact footprint and universal input voltage. The power supply fits easily in crowded electrical enclosures alongside contactors, relays, and terminal blocks, while its low acoustic noise makes it suitable for office and residential environments.

Small Machine Control: Packaging equipment, conveyor systems, and material handling machines with modest power requirements use the 6EP3333-6SB00-0AY0 to energize proximity sensors, photoelectric switches, indicator lights, and solenoid valves. The overload protection prevents nuisance shutdowns during motor starting or valve actuation transients.

Remote Monitoring Stations: Environmental monitoring, water level sensing, and agricultural automation systems deployed in outdoor enclosures rely on the wide operating temperature range (-25°C to +70°C) and robust protection features. The power supply maintains stable operation through seasonal temperature swings and electrical storms.

Installation & Integration

The power supply snaps onto standard 35mm DIN rail in seconds without tools or mounting hardware. Spring-loaded terminal blocks accept 0.5mm² to 2.5mm² wire (AWG 20-14), with captive screws that prevent accidental loosening during vibration. Color-coded terminals (L/N for AC input, +/- for DC output, PE for protective earth) reduce wiring errors and accelerate commissioning.

Front-panel LEDs provide instant status indication: green for normal operation, yellow for overload warning, and red for fault conditions. The diagnostic LEDs remain visible even when the power supply is installed deep within a control cabinet, eliminating the need to remove covers for routine status checks.

For systems requiring redundancy or higher current capacity, multiple 6EP3333-6SB00-0AY0 units can be paralleled using external diode modules (such as the Siemens 6EP1961 series). This configuration provides N+1 redundancy where one supply can fail without interrupting system operation, or allows load sharing to achieve 8A, 12A, or higher output currents.

Reliability & Protection Features

The power supply incorporates multiple protection mechanisms to ensure long-term reliability in harsh industrial environments:

Overload Protection: When output current exceeds 105% of rated capacity, the supply enters current-limiting mode, reducing output voltage while maintaining maximum safe current. Once the overload clears, normal operation resumes automatically without manual intervention.

Short Circuit Protection: A direct short across the output terminals triggers immediate current shutdown. The supply attempts automatic restart every few seconds, resuming normal operation once the short is removed. This hiccup mode prevents component damage while allowing recovery from temporary faults.

Overvoltage Protection: Internal circuitry clamps output voltage to 32V maximum, protecting sensitive 24V DC loads from damage if the regulation circuit fails. This fail-safe design prevents cascading failures that could destroy connected equipment.

Thermal Management: Convection cooling eliminates fan noise and maintenance requirements. The aluminum housing acts as a heat sink, dissipating heat through natural airflow. Above 60°C ambient temperature, the supply automatically derates output current to prevent overheating, maintaining operation at reduced capacity rather than shutting down completely.

Common Questions

Q: Can this power supply operate on DC input voltage?
A: No, the 6EP3333-6SB00-0AY0 is designed exclusively for AC input (100-240V AC). For DC input applications, consider the Siemens 6EP3331 series which accepts 110-300V DC input.

Q: What is the maximum cable length I can use between the power supply and the load?
A: Cable length depends on wire gauge and acceptable voltage drop. For 4A load at 24V DC with 1V drop (4%), use 1.5mm² wire for runs up to 15 meters, or 2.5mm² wire for runs up to 25 meters. The output voltage adjustment feature can compensate for moderate voltage drop.

Q: Does this power supply require a fuse or circuit breaker on the AC input?
A: Yes, install a 6A slow-blow fuse or 10A circuit breaker on the AC input line for compliance with electrical codes and to protect building wiring. The power supply's internal protections safeguard the unit itself, but external overcurrent protection is required for the AC supply circuit.

Q: Can I use this power supply to charge 24V batteries?
A: While the power supply can provide charging current, it lacks the voltage regulation profile required for proper battery charging (bulk, absorption, float stages). For battery backup applications, use a dedicated battery charger or the Siemens 6EP1931 DC UPS module designed for battery management.

Maintenance & Longevity

The 6EP3333-6SB00-0AY0 requires no scheduled maintenance under normal operating conditions. The fanless design eliminates bearing wear and filter cleaning, while the electrolytic capacitors are rated for 105°C operation, ensuring long service life even in elevated ambient temperatures. Typical installations achieve 10-15 years of continuous operation before component aging necessitates replacement.

Periodic inspection should verify that ventilation openings remain unobstructed, terminal connections are tight, and no dust accumulation impedes heat dissipation. In dusty environments, annual cleaning with compressed air maintains optimal thermal performance.

Warranty & Support

This Siemens 6EP3333-6SB00-0AY0 LOGO!POWER stabilized power supply is backed by a 12-month warranty covering manufacturing defects and component failures under rated operating conditions. Our technical support team provides application assistance, sizing calculations, and troubleshooting guidance to ensure successful integration into your automation system.

Related Power Supply Solutions

Expand your power distribution capabilities with these compatible Siemens products:

• Siemens 6EP3333-8SB00-0AY0 LOGO!POWER 24V 8A Stabilized Power Supply - Higher current capacity for expanded systems
• Siemens 6EP1436-3BA00 SITOP Modular 20A Stabilized Power Supply - Industrial-grade supply for larger installations
• Siemens 6EP1436-2BA10 SITOP PSU300S 20A Stabilized Power Supply - Compact 20A supply with advanced diagnostics

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