Weidmuller 8708680000 Retrofit-Ready 24VDC PSU for ConnectPower Control Systems
The Weidmuller 8708680000 is a 24VDC DIN rail-mount power supply from the ConnectPower series, engineered to serve as a direct retrofit replacement for aging or discontinued PSU modules in industrial control panels. Whether you are upgrading a legacy automation cabinet, replacing a failed unit in a Siemens S7-300 or S7-400 rack environment, or migrating a control system from an older Weidmuller PRO series power supply, the 8708680000 delivers the output stability and form factor compatibility required for seamless integration without panel redesign.
Industrial facilities operating legacy DCS platforms, standalone PLC cabinets, or hybrid control architectures frequently encounter the challenge of sourcing reliable replacement power supplies that match original wiring layouts, DIN rail footprints, and output specifications. The 8708680000 addresses this directly: its terminal block layout is compatible with standard 35mm DIN rail mounting, and its 24VDC regulated output supports the full range of field I/O modules, communication gateways, and HMI panels commonly found in brownfield installations.
Upgrade Compatibility Table
| Parameter | Detail |
|---|---|
| SKU | 8708680000 |
| Brand / Series | Weidmuller / ConnectPower |
| Output Voltage | 24VDC Regulated |
| DIN Rail Compatibility | 35mm TS35 Standard |
| Terminal Interface | Screw-type, compatible with standard 2.5mm² field wiring |
| Replacement Compatibility | Weidmuller PRO series, CP series legacy PSUs |
| Communication Impact | None — passive power supply, no protocol dependency |
| Installation Requirement | Verify input voltage range (100–240VAC) before wiring |
| Commissioning Note | Confirm output load does not exceed rated current; check downstream I/O bus draw |
| Warranty | 12 Months from date of shipment |
Retrofit Planning for Existing Automation Systems
When planning a power supply retrofit in an existing control cabinet, the 8708680000 is typically installed alongside or in place of legacy Weidmuller CP SNT series or PRO series units. Before removal of the original PSU, engineers should document the existing terminal wiring using the original panel drawing or a field-traced wiring diagram. The 8708680000 uses the same screw-terminal interface, which simplifies re-termination and reduces the risk of wiring errors during the swap.
In cabinets where the 8708680000 powers a Siemens ET 200S distributed I/O station or a Beckhoff EK1100 EtherCAT coupler, it is important to verify that the total current draw of all connected I/O modules — including digital input modules, analog output modules, and communication interface modules — does not exceed the PSU’s rated output current. For systems using a Phoenix Contact QUINT or TRIO power supply in parallel redundancy configurations, the 8708680000 can serve as the primary or secondary unit depending on load balancing requirements.
Control cabinets undergoing a broader migration from legacy Modbus RTU networks to PROFINET or EtherNet/IP architectures often require simultaneous replacement of the power supply, communication gateway, and I/O backplane. In these scenarios, the 8708680000 is commonly deployed alongside a Weidmuller IE-SW-VL05M managed Ethernet switch, a Siemens CP 343-1 PROFINET communication processor, or an Allen-Bradley 1756-EN2T ControlLogix Ethernet module. The stable 24VDC output of the 8708680000 ensures that newly installed communication modules receive clean, regulated power during the critical commissioning phase.
For HMI panel upgrades — such as replacing a legacy Siemens OP7 or OP17 operator panel with a modern Siemens KTP700 Basic or a Weintek MT8071iE touch panel — the 8708680000 provides the 24VDC supply rail required by the new HMI hardware without requiring changes to the cabinet’s main power distribution architecture. Similarly, when adding Weidmuller ACT20P signal conditioners or Murrelektronik MICO+ electronic circuit breakers to an existing panel, the 8708680000 supports the expanded load without panel rewiring.
Downtime Control During System Migration
Minimizing unplanned downtime is the primary concern during any power supply replacement in a live production environment. The recommended approach for replacing a failed or end-of-life PSU with the 8708680000 is to pre-stage the unit on the bench: mount it on a short section of DIN rail, pre-terminate the input and output wiring using the original panel drawing, and verify output voltage under a representative load before installation.
Where process continuity is critical, a temporary 24VDC UPS module — such as a Weidmuller Buffer Module or a Phoenix Contact UPS-IQ — can be used to maintain power to the PLC CPU, I/O bus, and communication modules during the physical swap. This approach preserves the active program logic in the PLC’s RAM and maintains the PROFIBUS DP or PROFINET network link, preventing downstream field devices from entering fault states.
After installation of the 8708680000, the commissioning sequence should include: verification of output voltage at the PSU terminals, confirmation of correct polarity on all downstream 24VDC loads, a functional test of all I/O channels, and a review of the PLC diagnostic buffer for any power-related fault entries. If the system uses a Siemens S7-1500 or a Rockwell Automation ControlLogix controller, the controller’s event log should be reviewed to confirm that no I/O module reported a power fault during the transition.
Original program logic, HMI screen configurations, and communication link parameters are not affected by a power supply replacement, provided that the PLC CPU and communication modules remained powered throughout the swap using a UPS or buffer module. This approach reduces total migration downtime to under 30 minutes in most standard cabinet configurations.
Retrofit Support FAQ
Q: Is the Weidmuller 8708680000 a direct drop-in replacement for the Weidmuller CP SNT 65W 24VDC?
A: The 8708680000 shares the same DIN rail mounting standard and 24VDC output voltage as the CP SNT series. Verify the output current rating and terminal pitch before installation to confirm full compatibility with your existing wiring and load configuration.
Q: What wiring checks are required before commissioning the 8708680000 in a legacy panel?
A: Confirm input voltage range matches your site supply (100–240VAC), verify terminal torque specifications for all screw connections, and measure the total 24VDC load current of all connected devices to ensure it is within the PSU’s rated output. Check for any shared neutral or earth bonding differences between the old and new unit.
Q: Does replacing the power supply affect the PLC program or HMI configuration?
A: No. The 8708680000 is a passive power supply with no programmable parameters. Replacing it does not alter PLC program memory, HMI project files, or communication link configurations, provided the controller and HMI remained powered during the swap.
Q: What does the 12-month warranty cover for the 8708680000?
A: The 12-month warranty covers manufacturing defects and component failures under normal operating conditions. Each unit is functionally tested prior to shipment. Warranty claims are supported by SMARTNEXMSK with direct replacement or refund, subject to inspection of the returned unit.
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