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- 6EP1961-3BA21
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We provide 1 year warranty for all remaining parts.
The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
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Amikon offers a wide range of components, products and services related to industrial automation. We have a large surplus of stocks and are also distributors of new products from a variety of quality manufacturers.
Technical specifications for 6EP1961-3BA21
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Product Model6EP1961-3BA21
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Product ParametersSITOP Redundancy Module
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Tariff Code8537101190
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Country of originGermany
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Place of shipmentXiamen, China
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In stock1 unit
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Estimated Shipping Size7x12.6x13.5cm
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ManufacturerSiemens
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Weight0.4 kg
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type of the power supply networkDC voltage
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supply voltage at DC24 ... 24 V
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input voltage at DC24 ... 28.8 V
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voltage curve at outputControlled, isolated DC voltage
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Factory Default Threshold20 V
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Operating Temperature0°C ... +60°C
Description
The SIEMENS 6EP1961-3BA21 SITOP PSE202U Redundancy Module is a power supply redundancy solution designed to provide additional protection against failure of 24 V DC supply systems in critical industrial automation applications. 6EP1961-3BA21 serves as the optimal addition to all 24 V power supplies, decoupling two identical SITOP power supplies so that in the event of one power supply failure, the load continues to be supplied by the second power supply without interruption.
6EP1961-3BA21 is designed for decoupling two SITOP power supplies with a maximum of 20 A output current each, delivering a combined rated output current of 40 A at 24 V DC. The input voltage range of 6EP1961-3BA21 is 24 V to 28.8 V DC, with the output voltage following the formula Vin minus approximately 0.5 V. The output voltage of 6EP1961-3BA21 is not adjustable, providing a controlled, isolated DC voltage to the connected load.
The redundancy function of 6EP1961-3BA21 continuously monitors the feeding power supplies in real-time. When one of the two connected power supplies fails, 6EP1961-3BA21 automatically switches the complete load to the remaining healthy power supply. This automatic takeover of 6EP1961-3BA21 ensures continuous operation of critical control systems, PLCs, HMI devices, and field instrumentation that cannot tolerate power interruptions.
6EP1961-3BA21 is designed for decoupling two SITOP power supplies with a maximum of 20 A output current each, delivering a combined rated output current of 40 A at 24 V DC. The input voltage range of 6EP1961-3BA21 is 24 V to 28.8 V DC, with the output voltage following the formula Vin minus approximately 0.5 V. The output voltage of 6EP1961-3BA21 is not adjustable, providing a controlled, isolated DC voltage to the connected load.
The redundancy function of 6EP1961-3BA21 continuously monitors the feeding power supplies in real-time. When one of the two connected power supplies fails, 6EP1961-3BA21 automatically switches the complete load to the remaining healthy power supply. This automatic takeover of 6EP1961-3BA21 ensures continuous operation of critical control systems, PLCs, HMI devices, and field instrumentation that cannot tolerate power interruptions.
Information
Overview
Manuals
Application Notes
Product Applications
LED Status Signaling & Diagnostics
Features:
- 24 V DC / 40 A Redundancy Decoupling
- Continuous Power Supply Monitoring
- Adjustable Switching Threshold (20–25 V)
- Visual and Relay Contact Signaling
The module accepts two 24 V DC inputs (24–28.8 V DC range) from independent SITOP power supplies, each rated at maximum 20 A output current. It electrically separates the two supplies through passive decoupling so that neither can backfeed into the other, while allowing both to simultaneously deliver current to a common output bus. The aggregate output current is 40 A maximum at 24 V DC nominal (output voltage follows input minus approximately 0.5 V drop).
The 6EP1961-3BA21 Siemens SITOP PSE202U redundancy module may still be available for purchase and support from Amikon Limited beyond End-Of-Life (EOL) by the manufacturer (OEM).
Siemens 6EP1961-3BA21 SITOP PSE202U redundancy module Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
6EP1961-3BA21 features comprehensive status indication and signaling capabilities. A green LED on 6EP1961-3BA21 lights up when both input voltages exceed the configured switching threshold, indicating normal redundant operation. A red LED on 6EP1961-3BA21 illuminates when at least one input voltage falls below the switching threshold, alerting operators to a power supply fault condition. Additionally, 6EP1961-3BA21 provides an isolated floating relay contact (changeover contact) rated at 8 A/240 V AC or 24 V DC, which signals OK status when both input voltages are above the threshold. This relay contact of 6EP1961-3BA21 can be evaluated by a control system, PC, or higher-level monitoring system for remote fault notification.
The switching threshold of 6EP1961-3BA21 is adjustable via a potentiometer located on the front of the device, with a setting range from 20 V to 25 V. When delivered from the factory, 6EP1961-3BA21 is preset to 20 V. Only an insulated screwdriver should be used when adjusting the potentiometer of 6EP1961-3BA21. This adjustable threshold allows engineers to customize the voltage monitoring sensitivity based on specific application requirements and power supply characteristics.
- Automotive Manufacturing: Keeps robotic lines, welding controls, and conveyors operational to prevent stoppages
- Process/Chemical Plants: Secures PCS 7 systems, field sensors, and emergency valves for continuous safety
- Water/Wastewater: Supplies fail-safe power to telemetry units, dosing controllers, and pumping stations
- Food/Beverage: Safeguards packaging equipment and mixing controls to avoid product spoilage
- Building Automation: Integrates into cabinets managing ventilation, security, and monitoring hardware
This content has been produced using multiple sources.Amikon takes no responsibility for the accuracy of this information. Always consult the original equipment manufacturer for the most up to date instructions and information.
The module gives you immediate visual indicators and physical relay switching to determine power health.
Green LED On: Normal operation. Both input voltages are safely above the configured switching threshold.
Red LED On: Fault status. At least one input voltage has dropped below your set threshold level.
Relay Contact: The floating relay contact shifts state to signal an "OK" status only if both input lines are above the threshold
Alternative Names
6EP1961-3BA2I
6EP1961-3BAZ1
6EP1961-38A21
6EP196I-3BA21
6EPI961-3BA21
6EP1961 3BA21
6EP1961 3BA2I
6EP1961 3BAZ1
6EP1961 38A21
6EP196I 3BA21
6EPI961 3BA21
6EP19613BA21
Technical notes
The operating temperature range of 6EP1961-3BA21 is -25°C to +60°C, with derating of 3% per Kelvin from +60°C to +70°C. The maximum aggregate output current of 6EP1961-3BA21 is 40 A at temperatures up to +60°C, with reduced capacity at higher temperatures. 6EP1961-3BA21 operates with natural convection cooling, requiring no external ventilation. The minimum required spacing for 6EP1961-3BA21 is 50 mm at the top, 50 mm at the bottom, and 0 mm on the left and right sides when mounted side-by-side with other devices.
FAQs
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What is the 6EP1961-3BA21?
+The Siemens SITOP PSE202U (6EP1961-3BA21) is a 24 V DC redundancy module used to decouple two SITOP power supplies. -
What is the primary function of this module?
+It is designed to decouple two identical 24 V power supplies (up to 20 A each) to create a highly reliable, redundant power system. If one power supply experiences a short-circuit or fails, the module isolates it so the system stays powered. -
What is the difference between the 6EP1961-3BA21 and the older 6EP1961-3BA20?
+The -3BA21 is the direct successor and is fully compatible in both function and physical dimensions with the older -3BA20 module. -
What power supplies can it be used with?
+It is ideal for decoupling two SITOP power supplies, with a maximum of 20 A output current per power supply.
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