Weidmuller 8708680000 Replacement/Upgrade for ConnectPower

Product Overview

Weidmuller 8708680000 Replacement/Upgrade Solution for ConnectPower: Smooth Transition to Reliable 24VDC Power

The Weidmuller 8708680000 is a 24VDC DIN Rail Power Supply from the Weidmuller ConnectPower series, engineered for continuous-duty industrial control panel applications. It is widely installed in PLC control cabinets, DCS marshalling panels, motor control centers, and distributed I/O enclosures across manufacturing, process, and infrastructure industries. As older 24VDC power supply units reach end-of-life or become unavailable through standard distribution channels, plant engineers and panel builders are seeking verified replacement units that can be installed without modifying existing wiring, DIN rail mounting, or cabinet layout.

TOPNLMS supplies the Weidmuller 8708680000 as a direct drop-in replacement for failed, aging, or discontinued 24VDC PSU units. Whether you are responding to an emergency power supply failure on a running production line or planning a proactive spare parts refresh during a scheduled maintenance window, this unit is stocked, pre-shipment tested, and ready to dispatch from Xiamen.

Compatibility Comparison Table

Seamless Upgrade Solutions

A 24VDC power supply replacement in an industrial control panel rarely occurs in isolation. The Weidmuller 8708680000 typically powers a shared 24VDC bus that supplies multiple downstream devices within the same cabinet. When replacing this PSU, it is good engineering practice to simultaneously inspect and, where necessary, replace the Weidmuller ACT20P signal conditioners or Weidmuller WTR terminal blocks connected to the same 24VDC rail, as these components share the same service life and are often replaced in the same maintenance window.

In PLC-based control panels, the 24VDC bus powered by the 8708680000 typically supplies the I/O modules of systems such as a Siemens S7-300 SM321 Digital Input Module or Siemens ET 200SP I/O station, where stable 24VDC supply is critical for accurate signal acquisition. Similarly, in Schneider Electric Modicon-based panels, the same 24VDC rail feeds Schneider TM3 I/O expansion modules or Modicon M340 CPU power rails. Replacing the PSU with a verified ConnectPower unit ensures that these downstream devices receive a clean, regulated supply without voltage sag or ripple that could cause spurious I/O faults.

For panels undergoing a broader modernization — for example, migrating from a legacy relay-logic cabinet to a PLC-based architecture — the 8708680000 is frequently specified alongside a Weidmuller u-mation controller or as the primary 24VDC source for a new Phoenix Contact QUINT-PS power supply redundancy module, where dual PSU redundancy is required for high-availability applications. In such configurations, a Weidmuller SU redundancy module or equivalent diode ORing module is installed between the two PSUs to prevent back-feed and ensure seamless switchover.

Communication infrastructure within the same cabinet may include a Weidmuller IE-SW industrial Ethernet switch or a Weidmuller COMTRAXX gateway, both of which draw from the same 24VDC bus. Ensuring the PSU is correctly sized for the total connected load — including PLC CPUs, I/O modules, HMI panels, communication gateways, and relay coils — is a key step in the replacement assessment. TOPNLMS can assist with load calculation guidance upon request.

For sites where the control cabinet also houses a Weidmuller OMNIMATE signal terminal block strip or Weidmuller klippon connect marshalling terminals, the PSU replacement is a natural trigger point to inspect terminal block condition, tighten connections, and replace any discolored or heat-stressed terminals identified during the maintenance window.

Retrofit Guidance FAQ

Q: Can I replace the 8708680000 without rewiring the AC input or 24VDC output terminals?
A: In most cases, yes. The ConnectPower series uses standard screw terminal connections for both AC input and 24VDC output. Existing wiring can typically be transferred directly to the replacement unit. Always verify terminal torque specifications per the Weidmuller datasheet before re-energizing.

Q: Does the replacement PSU fit the same DIN rail position without panel modification?
A: Yes. The 8708680000 mounts on standard 35mm DIN rail (EN 60715). The physical width and depth are consistent with the ConnectPower series form factor. No additional mounting hardware or panel cutout modification is required.

Q: What should I check before energizing the replacement PSU?
A: Verify AC input wiring polarity and voltage range, confirm all 24VDC output terminals are correctly connected, and measure no-load output voltage before connecting downstream devices. Check that the PSU’s output current rating meets or exceeds the total connected load.

Q: Is the 8708680000 compatible with redundant PSU configurations?
A: Yes, provided a suitable redundancy or diode ORing module is used between the two PSUs. The ConnectPower series is designed to support parallel redundant operation when combined with an appropriate decoupling module. Consult the Weidmuller system documentation for the correct redundancy module pairing.

Q: What is the input voltage range of the 8708680000?
A: The ConnectPower series supports wide-range AC input, typically 100–240VAC, making it compatible with both 110VAC and 230VAC supply systems without manual voltage selection. Confirm the exact specification on the unit label before installation.

Q: How do I verify the PSU is functioning correctly after installation?
A: After energizing, check the output voltage at the 24VDC terminals with a calibrated multimeter. Confirm the status LED (if fitted) indicates normal operation. Monitor the output under full load for a short period to confirm thermal stability before closing the cabinet.

Warranty Assurance

Every Weidmuller 8708680000 ConnectPower 24VDC DIN Rail Power Supply supplied by TOPNLMS is covered by a 12-Month Warranty from the date of shipment. Prior to dispatch, each unit undergoes a functional verification check confirming correct output voltage, overload protection response, and physical condition. Units that do not meet our outgoing quality standard are not shipped.

In the event of a warranty claim, TOPNLMS will assess the reported fault and, where confirmed to be a manufacturing or latent defect, arrange a replacement unit at no additional cost. Our after-sales response target is within 1 business day for warranty inquiries. We understand that PSU failures in operating control panels carry significant production risk, and our procurement and logistics team is structured to support urgent replacement requirements with priority handling.

For customers purchasing multiple units for critical spare inventory, we recommend requesting a batch test report at the time of order. Stocking verified spare PSUs on-site is the most effective strategy for minimizing mean time to repair (MTTR) when a power supply fails in service.

All units are shipped with appropriate anti-static and impact-protective packaging, clearly labeled with part number and serial reference, and accompanied by a basic inspection record. Export documentation for international shipments is prepared in compliance with applicable customs requirements.