New Original Siemens 6EP1961-3BA21 SITOP PSE202U redundancy module
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New Original Siemens 6EP1961-3BA21 SITOP PSE202U Redundancy Module
1. Product Overview
The Siemens 6EP1961-3BA21 is a brand-new original SITOP PSE202U industrial redundancy module, an essential auxiliary accessory for SITOP series 24 V DC stabilized power supplies. It is not an independent power supply unit, but an intelligent decoupling module specially designed to build 1+1 or N+1 redundant power supply systems for critical automation loads. This model supports two separate 24 V DC power supply inputs with a total maximum aggregate output current of 40 A, effectively isolating two parallel power supplies to prevent reverse current backflow between units. When one power supply fails, experiences undervoltage or shuts down, the module instantly switches the load to the other healthy power unit without power interruption to downstream PLCs, HMIs, safety relays and sensors. Widely applied in high-availability scenarios including robotic workstations, medical automation equipment, packaging production lines, central control rooms and process instrumentation cabinets. Adopting standard 35 mm DIN rail modular mounting, it matches all SITOP modular power supplies and forms a complete high-reliability power architecture together with buffer modules and selectivity modules. The device carries global industrial safety certifications and features adjustable undervoltage detection threshold and isolated fault signal feedback contacts for upper system diagnosis.
2. Main Functions
- Bidirectional Diode Decoupling Protection
Built-in high-power decoupling diodes electrically separate two parallel 24 V power supplies, eliminating reverse current risk and avoiding cross-fault damage when one power supply breaks down.
- Uninterrupted Redundant Power Switching
Supports 1+1 redundant configuration (two power supplies for full backup). If one input voltage drops below the set threshold, the module automatically transfers all load current to the normal power unit with zero power cut.
- Adjustable Undervoltage Detection Threshold
Front-panel potentiometer allows users to set the fault trigger voltage from 20 V DC to 25 V DC, adapting to different power supply voltage fluctuation tolerance requirements.
- Dual LED Visual Status Indication
Green LED lights up when both input channels operate above the threshold; red LED alarms if at least one power input runs under the set voltage for quick on-site fault judgment.
- Isolated Changeover Fault Signal Contact
Equipped with floating relay changeover contact (CO contact) to transmit power system fault signals to PLC, alarm buzzer or monitoring HMI for remote fault notification.
- 40 A Total High-Current Output Capacity
Supports two 20 A power supplies in parallel to provide a combined 40 A output for high-load control cabinets, also compatible with N+1 parallel expansion of multiple power supply groups.
- Full Range Internal Circuit Protection
Integrates overcurrent, overheat and reverse polarity protection; automatically limits internal current under abnormal conditions to protect the module and matched power supplies.
- Natural Convection Heat Dissipation Design
No extra cooling fan required; optimized metal housing structure realizes passive heat dissipation to reduce cabinet space occupation and equipment failure points.
- Standard DIN Rail Snap-on Mounting
Tool-free installation on universal 35 mm DIN rail, compatible layout with SITOP power supplies, buffer modules and other low-voltage control components.
- Wide Industrial Environmental Adaptation
Stable continuous operation under wide temperature ranges, resistant to light vibration and electromagnetic interference from inverters and servo drives inside electrical cabinets.
3. Technical Characteristics
表格
| Technical Parameter | Specification of 6EP1961-3BA21 PSE202U |
|---|---|
| Full Model Code | 6EP1961-3BA21 |
| Product Series | SITOP PSE202U Redundancy Module |
| Rated Input Voltage Range | 24 V DC ~ 28.8 V DC dual-channel input |
| Rated Output Voltage | Approx. Input Voltage minus 0.5 V DC |
| Total Maximum Aggregate Output Current | 40 A |
| Single Channel Matched Power Supply Max Current | 20 A per input channel |
| Adjustable Undervoltage Threshold | 20 V DC to 25 V DC |
| Status Indicator | Green LED (Dual Input Normal), Red LED (Input Undervoltage Fault) |
| Signal Relay Contact Type | Isolated floating changeover contact (CO) |
| Relay Contact Rated Load | 8 A / 240 V AC; 8 A / 24 V DC |
| Internal Protection | Overheat, overcurrent, reverse polarity protection |
| Galvanic Isolation | SELV isolation for signal relay circuit per EN 60950-1 |
| Mounting Standard | 35 mm EN standard DIN rail |
| Protection Grade | IP20 (only for cabinet internal installation) |
| Operating Ambient Temperature | 0 °C ~ +60 °C natural convection |
| Storage & Transport Temperature | -40 °C ~ +70 °C |
| Required Mounting Spacing | 50 mm clearance on top and bottom; zero side clearance |
| Terminal Wire Range | Power terminals: 0.33 ~ 10 mm²; signal relay terminals: 0.5 ~ 2.5 mm² |
| Compliance Certifications | CE, UL, CSA, IEC 61010, IEC 62477 industrial safety standards |
4. Product Dimensions & Weight
4.1 Overall Outer Dimensions
表格
| Dimension Item | Exact Measurement |
|---|---|
| Module Width | 70 mm |
| Module Height | 125 mm |
| Overall Depth | 125 mm |
4.2 Weight Specifications
- Single unit net weight (without packaging): 0.50 kg
- Gross weight with original individual carton packaging: 0.64 kg
5. Core Structural & Design Advantages
- High-power low-loss decoupling diode core: Low voltage drop during normal operation, minimizing power loss and heat generation for long-time continuous operation.
- Compact slim housing: Narrow 70 mm width saves DIN rail space, supporting dense modular layout in small and medium control cabinets.
- Detachable screw terminal blocks: Compatible with solid and stranded copper wires, convenient wiring modification and equipment maintenance without cutting cables.
- Independent isolated fault signal circuit: The feedback relay circuit is electrically separated from power input loops to avoid signal distortion caused by power grid interference.
- Uniform SITOP system compatibility: Can be freely combined with all SITOP modular, smart and compact series 24 V power supplies without extra matching accessories.
- Robust industrial metal casing: Anti-vibration structure adapts to mechanical workshop environments with frequent equipment movement and vibration.
- RoHS & REACH compliant environmental design: Meets global export environmental protection standards for automation equipment sold worldwide.
6. List of 10 Similar Functional Siemens SITOP Redundancy & Decoupling Modules
All listed products are SITOP series power redundancy decoupling modules with dual-input isolation, DIN rail mounting and fault signal feedback functions, differing in rated output current, voltage range and special industrial specifications:
- Siemens 6EP1964-2BA00 SITOP PSE202U: 24 V DC, total rated output 10 A small-current redundancy module
- Siemens 6EP1962-2BA00 SITOP PSE202U NEC Class 2: 24 V DC, limited 100 VA low-power safety redundancy module
- Siemens 6EP4347-7RB00-0AX0 SITOP RED1200: Universal 12–48 V DC wide voltage redundancy module, max 40 A output
- Siemens 6EP4348-7RB00-0AX0 SITOP RED1200: Wide voltage 12–48 V DC high-current model with 80 A total output
- Siemens 6EP4336-3RA00-0AY0 SITOP RED1000: 24 V DC 20 A anti-corrosion coated redundancy module for humid workshops
- Siemens 6EP4337-3RA00-0AY0 SITOP RED1000: 48 V DC 20 A wide-temperature redundancy module for high-altitude equipment
- Siemens 6EP1961-3BA01 SITOP PSE201U: Buffer redundancy integrated module with short power failure bridging function
- Siemens 6EP1961-2BA21 SITOP PSE200U: 10 A single-channel electronic selective decoupling module for small control systems
- Siemens 6EP1961-2BA41 SITOP PSE200U: 10 A multi-channel electronic decoupling module with independent channel reset button
- Siemens 6EP4347-7RB10-0AX0 SITOP RED1200 Explosion-proof: 40 A wide voltage redundancy module for hazardous area industrial cabinets
WHO WE ARE
About us
Located in Kunshan, China, Atifts Technology Co., Ltd. is a well-known enterprise specializing in electronic components distribution. We specialize in the sales of global brands of industrial automation components, with a wealth of experience in foreign product agents, and many of the world's leading manufacturers such as Keens, Schneider, SMC, ABB, Siemens, and other world-renowned manufacturers to establish a long-term and stable relations of cooperation.
Atifts Technology Co., Ltd. @ 2024
Over the years, we have always adhered to the "pioneering, pragmatic, standardized, innovative" management philosophy, and constantly promote the close integration of products and market demand. We firmly believe that only by constantly exploring new market areas, doing a good job in every detail, standardizing business processes, and continuously innovating products and services can we ensure that our products are more adaptable to market changes and meet the diversified needs of our customers.
Since the founding of the company, we have always adhered to the core concept of "survival by quality", and are committed to providing customers with high-quality electronic components. At the same time, we take specialized R & D manufacturing as the goal, market-oriented development strategy to ensure that our products are always in the forefront of the industry.
With excellent product quality, professional technical service and good market reputation, Kunshan Autofits Technology Co.,Ltd. has won the trust and support of our customers. We look forward to working with more partners hand in hand, to achieve long-term win-win relationship, and jointly promote the prosperity of the electronic components industry.
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