MURR 857781 MPS Power Supply 24VDC | Replacement, Equivalent & Selection Guide
The MURR 857781 is an industrial DIN rail-mount power supply from Murrelektronik’s MPS series, delivering stable 24 VDC output for PLC systems, control panels, and automation equipment. This page provides full technical specifications, compatible replacement models, and a structured selection guide to help engineers and procurement teams source the right unit.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 857781 |
| Brand | Murrelektronik (MURR) |
| Series | MPS |
| Output Voltage | 24 VDC |
| Mounting | DIN Rail (EN 60715 / TS 35) |
| Input Voltage | 100–240 VAC, 50/60 Hz (universal) |
| Protection Class | IP20 |
| Operating Temperature | -25 °C to +70 °C |
| Certifications | CE, UL, cUL |
| Housing | Compact DIN rail enclosure |
Note: Confirm exact output current rating from the product label or official Murrelektronik datasheet before replacement.
Compatible Replacement & Equivalent Models
The following models are commonly evaluated as functional equivalents or drop-in replacements for the MURR 857781. Always verify output current, voltage tolerance, and form factor before substitution.
| Brand | Model | Output | Notes |
|---|---|---|---|
| Murrelektronik | 857781 (OEM) | 24 VDC | Original unit — preferred replacement |
| Phoenix Contact | QUINT-PS series | 24 VDC | Higher-end alternative with diagnostics |
| Siemens | SITOP PSU100S | 24 VDC | Wide input range, robust for harsh environments |
| PULS | CP series | 24 VDC | Compact form, high efficiency (>93%) |
| Mean Well | SDR series | 24 VDC | Cost-effective DIN rail option |
| Weidmüller | PRO ECO series | 24 VDC | Comparable footprint and output range |
Why Choose the Original Model
- Guaranteed compatibility with existing Murrelektronik MPS system wiring and cabinet layouts
- Validated performance under Murrelektronik’s quality and burn-in testing protocols
- Regulatory compliance maintained — CE, UL markings preserved without re-certification
- Reduced commissioning risk — no re-parameterization or mechanical adaptation required
- Spare parts continuity for multi-unit installations already using the MPS series
Typical Applications
- PLC and DCS control panel power rails (24 VDC bus)
- Industrial automation cabinets and machine control systems
- Sensor and actuator power distribution in manufacturing lines
- Building automation and HVAC control systems
- Conveyor, packaging, and material handling equipment
- Safety relay and I/O module power supply
System Compatibility
The MURR 857781 MPS power supply is compatible with 24 VDC control architectures from major PLC and automation vendors, including:
- Siemens SIMATIC S7-300 / S7-400 / S7-1200 / S7-1500
- Allen-Bradley / Rockwell Automation ControlLogix, CompactLogix
- Schneider Electric Modicon M340 / M580
- Mitsubishi MELSEC iQ-R / iQ-F series
- Omron NX / NJ series
- Beckhoff CX / EK series
Verify load current requirements against your PLC backplane and I/O module specifications before installation.
Selection Guide
Use the following criteria to confirm the MURR 857781 is the correct unit for your application, or to select an appropriate equivalent:
- Output current (A): Match or exceed the total load current of all connected devices on the 24 VDC rail.
- Input voltage range: Confirm single-phase or three-phase input compatibility with your facility supply.
- Mounting space: Measure available DIN rail width in millimeters; compare with unit width.
- Ambient temperature: Ensure rated operating range covers your cabinet’s worst-case temperature.
- Certifications: Match CE, UL, or other regional marks required by your project specification.
- Redundancy: For critical systems, consider a parallel redundancy module (e.g., MURR MPS-R series).
Quality Assurance & Sourcing
- All units sourced through authorized distribution channels or verified surplus with full traceability
- Pre-shipment inspection available on request (visual, label verification, functional test report)
- Counterfeit-risk mitigation: serial number and date-code verification on every unit
- Packaging: original OEM packaging preferred; industrial anti-static packaging for surplus stock
- Lead time: typically 3–7 business days for in-stock units; contact us for urgent requirements
How to Order
- Confirm part number: MURR 857781
- Specify quantity and required delivery date
- Request a formal quotation via support@konmask.com or the contact form
- Provide project details if a compatibility review or datasheet is needed
- Payment and shipping terms confirmed upon order acknowledgment
Replacement & Compatibility FAQ
Q: Can I replace the MURR 857781 with a Mean Well SDR unit?
A: Yes, if the output current rating meets or exceeds your load and the physical dimensions fit your DIN rail space. Verify input voltage range and certifications match your project requirements.
Q: Is the 857781 still in production?
A: Contact Murrelektronik or an authorized distributor for current production status. Konmask.com can supply both new and verified surplus stock.
Q: What is the warranty on units purchased from Konmask.com?
A: All units carry a minimum 12-month warranty against manufacturing defects. Extended warranty options are available — contact us for details.
Q: Can you provide a datasheet or test report?
A: Yes. Request documentation at the time of inquiry and we will provide available technical documents.
Q: Do you ship internationally?
A: Yes. Konmask.com ships globally. Contact us for freight options, lead times, and export compliance documentation.
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