Description
Siemens 6ES7407-0KA02-0AA0
1. Basic Information
6ES7407-0KA02-0AA0 is a standard 10A rack power supply module (PS407) for Siemens SIMATIC S7‑400 PLC systems. It is embedded in the S7‑400 rack to provide stable and isolated bus power for CPUs, communication modules and IO modules. Featuring wide-range AC/DC input, input-output electrical isolation, 20ms power-off hold time and battery data backup function, it ensures high-reliability continuous operation for large-scale industrial control systems in metallurgy, power, chemical and rail transit industries.
2. Core Technical Specifications
2.1 Basic Parameters
- Model: 6ES7407-0KA02-0AA0
- Series: SIMATIC S7‑400
- Type: PS407 10A Rack Power Supply Module
- Main Output: 5V DC / 10A (Backplane bus)
- Aux Output: 24V DC / 1A
- Power-off Hold Time: 20ms
- Backup Battery: Support 3.6V AA battery
- Isolation: Complete input-output electrical isolation
- Protection Class: IP20
2.2 Input Electrical Parameters
- AC Input Range: 85～264V AC, 47～63Hz
- DC Input Range: 88～300V DC
- Rated Input Current: 1.0A @120V AC; 0.5A @230V AC
2.3 Protection & Monitoring
- Protection Functions: Overvoltage, undervoltage, overcurrent, short-circuit, overtemperature protection
- Status Indication: LED indicators for operation, fault and battery status
- Surge Protection: Built-in anti-surge circuit for grid impulse resistance
2.4 Environmental Parameters
- Operating Temperature: 0℃～+60℃
- Storage Temperature: ‑40℃～+85℃
- Humidity: 5%～95%RH (Non-condensing)
- Certifications: CE, UL, cULus, GL
3. Main Features
- Wide-range Universal Input: Adapts to global industrial power grids with wide AC/DC voltage tolerance, strong grid fluctuation resistance.
- Dual Stabilized Output: Independent 5V bus power for core modules and 24V auxiliary power for field signal devices.
- 20ms Power Failure Ride-through: Avoids system reset and data loss caused by instantaneous grid flicker and drop.
- Battery Data Backup: Preserves program and process parameters after full power outage to ensure data integrity.
- Full Electrical Isolation: Isolates grid interference and surge to protect internal PLC system from external electrical faults.
- Multi-dimensional Safety Protection: Comprehensive fault protection and self-locking to avoid module and system burnout.
- Integrated Rack Design: Space-saving embedded installation with neat wiring and convenient maintenance.
- Industrial Long-term Stability: Supports 7×24h continuous heavy-load operation with high vibration and temperature resistance.
4. Working Principle
- Power Conversion: Converts wide-range AC/DC input into stable DC voltage through internal rectification, filtering and regulation circuits.
- Isolation & Noise Reduction: Isolates external grid interference to purify power quality for the PLC backplane bus.
- Dual-channel Output: Provides precise 5V DC bus power and 24V DC auxiliary power for system operation.
- Real-time Monitoring: Continuously monitors input voltage, output current and module temperature status.
- Intelligent Fault Protection: Cuts off output and locks fault status immediately when abnormal parameters are detected.
- Power-off Buffer & Backup: Maintains 20ms continuous power during grid transient failure; backup battery saves system data after complete power loss.
- Automatic Recovery: Resumes stable power output automatically after grid and load conditions return to normal.
5. Typical Applications
5.1 Large S7‑400 Main Control System
Serves as the core power supply for heavy industrial main control cabinets in metallurgy, chemical and power industries to ensure stable operation of key process systems.
5.2 High-reliability Redundant Control System
Adopts power-off buffer and data backup functions to eliminate system reset and shutdown risks caused by unstable power grid.
5.3 Complex Industrial Power Grid Scenarios
Adapts to industrial sites with severe harmonic interference and voltage fluctuation, improving system anti-interference ability and operational stability.
5.4 Rail Transit & Municipal Infrastructure
Applied in high-standard automation systems such as rail transit control and large water treatment with multiple industrial certifications.
5.5 S7‑400 Equipment Maintenance & Replacement
Direct replacement for aging faulty power modules to restore system power supply stability without rack and wiring modification.
