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SITOP PSE200U 4-channel selectivity module
input: 24 V DC/40 A, output: 24 V DC/4 x 10 A
threshold adjustable from 3 A to 10 A
with common signaling contact
The 6EP1961-3BA21 is a SITOP PSE202U redundancy module operating within the SITOP power supply product line . This hardware component functions with a rated input and output voltage of 24V DC and manages a maximum total throughput current of 40A .
Safe decoupling and seamless switching ensure 24/7 uptime for critical loads
Adjustable 20V-25V monitoring with LEDs and relay contacts for instant PLC alerts
Up to 96.6% efficiency lowers cabinet heat and ensures stable harsh-environment running
It is used for the electrical decoupling of two individual SITOP power supply units, where each power supply provides a maximum output current limit of 20A. By utilizing internal diode circuitry, the module isolates the parallel-connected power sources. This electrical isolation prevents a short circuit or internal component failure in one power supply from interrupting the 24V DC distribution network to the connected field loads. For local device diagnostics, the module incorporates a front-facing LED indicator that displays the operational status of the incoming power channels. Remote monitoring is supported through an integrated dry signaling contact, allowing the hardware to transmit fault conditions to a higher-level PLC controller.
The physical enclosure features an IP20 protection rating and is configured for direct installation onto standard DIN rails. Regarding compliance updates, standard Ex explosion-proof certification is no longer available for this specific unit model. The module is applied in standard industrial electrical control cabinets to maintain continuous 24V DC power availability for control loops and automation infrastructure.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Siemens 6EP1961-3BA21 SITOP PSE202U 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.
Automotive Manufacturing
Prevents production line stoppages due to power failure during critical assembly stages. Powering PLC systems and robotic arms in automated welding and painting shops.
Semiconductor & Electronics
Avoids massive product scrapping caused by momentary voltage drops in cleanrooms. Ensuring uninterrupted 24V power for wafer transport robots and lithography control tracks.
Pharmaceutical & Life Sciences
Guarantees compliance and temperature stability during precise chemical/biological synthesis. Supplying redundant power to bioreactor controllers and automated vaccine packaging systems.
Oil and Gas
Ensures functional safety and remote telemetry monitoring in highly hazardous areas. Powering Emergency Shutdown (ESD) systems and SCADA RTUs on offshore drilling platforms.
Chemical Processing
Maintains critical cooling, mixing, and pressure monitoring to prevent thermal runaway. Redundant supply for DCS (Distributed Control System) fieldbus modules in polymerization reactors.
Metal & Steel Processing
Protects heavy machinery and personnel by ensuring controlled shutdowns during main power loss. Safeguarding the continuous casting control panels and blast furnace cooling monitors.
When using the module, ensure that both input voltages are perfectly matched and never exceed the 40A maximum rated current. It is critical to accurately set the 20V–25V signaling threshold via the potentiometer and wire the integrated relay contact to your PLC for real-time fault alerts. Additionally, maintain proper ventilation and cooling within the cabinet to guarantee long-term stability in harsh industrial environments.
The Siemens 6EP1961-3BA21 is a 24V DC / 40A redundancy module used to decouple two power supplies of up to 20A each. It features internal diode isolation, an IP20 rating, an integrated signaling contact, and a status LED, though official Ex explosion-proof approvals are no longer available.
This is a 4-channel electronic selectivity and diagnostic module from the Siemens SITOP power supply series.
How do you use the 6EP1961-3BA21?
Users install it on a DIN rail, connect the 24V DC main power supply to the input terminal, and connect 4 independent load circuits to its outputs for overload protection.
What is the primary technical function of the 6EP1961-3BA21?
Its primary function is to monitor the branch currents of 4 separate 24V DC channels, precisely shutting down the faulty channel during an overload or short circuit to keep other healthy channels and the main power supply unaffected.
What is the rated input and operating voltage of the 6EP1961-3BA21?
The rated operating voltage of this module is 24V DC.
What is the current adjustment range for each channel of the 6EP1961-3BA21?
The rated output current of each channel can be individually adjusted between 3A and 10A via the potentiometers on the front panel.
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Disclaimer: We are not an authorized distributor or distributor of the product manufacturer of this website, The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because our company is not an authorized distributor of this product, the Original Manufacturer`s warranty does not apply.While many DCS PLC products will have firmware already installed, Our company makes no representation as to whether a DSC PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. Our company also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from our company, its distributors, or any other source. Our company also makes no representations as to your right to install any such firmware on the product. Our company will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.
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