Murrelektronik MCS20 Series Power Supplies: MCS20-230/24

Technical Dossier

Product Details And Specifications

Murrelektronik MCS20 Series: Comprehensive Module Range and Technical Overview

The Murrelektronik MCS20 series is a line of DIN-rail-mounted switched-mode power supplies (SMPS) engineered for continuous-duty industrial environments. Deployed across chemical processing plants, oil refineries, nuclear auxiliary systems, and heavy manufacturing facilities, the MCS20 range converts single-phase AC input (100–240 V AC or fixed 230 V AC) to regulated 24 V DC output at current ratings from 1.3 A to 20 A. Its compact form factor, high efficiency (up to 93%), and wide operating temperature range (−25 °C to +70 °C) make it a standard specification item in European and Asian process automation projects. The series complies with EN 61000-6-2 (industrial EMC immunity), EN 61000-6-4 (industrial EMC emission), and carries CE, UL, and cUL marks. Parallel operation for redundancy and load sharing is supported across the range, a critical requirement in safety-instrumented systems (SIS) and distributed control system (DCS) power architectures.

The Evolution of MCS20 Architecture

Murrelektronik introduced the MCS series in the early 2000s as a successor to transformer-based linear power supplies that dominated panel-building practice through the 1990s. The MCS10 generation established the brand's DIN-rail footprint; the MCS20 followed with higher power density and active power factor correction (PFC) on higher-current variants. Key architectural milestones include the transition from analog control loops to digital PWM controllers (improving load regulation to ±1%), the introduction of the DC-OK relay contact output for PLC-monitored power health signaling, and the addition of the parallel diode module (MCS20-PAR) enabling N+1 redundancy without external OR-ing diodes. Later firmware revisions addressed harmonic distortion compliance under EN 61000-3-2 Class A. The MCS20 series is now in its mature/end-of-active-production phase for several variants; Murrelektronik's current primary line is the MCS-B and MCZ series. However, installed base volume across legacy DCS and PLC panels means MCS20 spare parts demand remains active through at least 2030. Long-term maintenance support — including refurbished exchange units and new-old-stock (NOS) inventory — is the primary sourcing strategy for this series.

MCS20 Full Catalog & Functionalities (SKU List)

The following SKUs represent the verified MCS20 series production range. Each entry includes a concise functional descriptor. SKUs are organized by output current rating and variant type.

MCS20-230/24: 230 V AC input, 24 V DC / 20 A output, single-phase SMPS, DIN-rail
MCS20-100-240/24: Wide-range 100–240 V AC input, 24 V DC / 20 A, universal input SMPS
MCS20-230/24-D: 230 V AC input, 24 V DC / 20 A, with DC-OK relay contact output
MCS20-100-240/24-D: Wide-range input, 24 V DC / 20 A, DC-OK relay contact, universal
MCS20-230/12: 230 V AC input, 12 V DC / 20 A output, DIN-rail mount
MCS20-100-240/12: Wide-range input, 12 V DC / 20 A, universal input variant
MCS20-230/48: 230 V AC input, 48 V DC / 10 A output, telecom/fieldbus supply
MCS20-100-240/48: Wide-range input, 48 V DC / 10 A, universal input variant
MCS20-230/24-10A: 230 V AC input, 24 V DC / 10 A output, half-load compact variant
MCS20-100-240/24-10A: Wide-range input, 24 V DC / 10 A, compact footprint
MCS20-230/24-5A: 230 V AC input, 24 V DC / 5 A output, low-load panel supply
MCS20-100-240/24-5A: Wide-range input, 24 V DC / 5 A, low-load universal variant
MCS20-230/24-2.5A: 230 V AC input, 24 V DC / 2.5 A, minimal-load auxiliary supply
MCS20-PAR: Parallel diode module for MCS20 redundancy / load-sharing configuration
MCS20-230/24-1.3A: 230 V AC input, 24 V DC / 1.3 A, smallest current rating in series
MCS20-100-240/24-1.3A: Wide-range input, 24 V DC / 1.3 A, universal compact supply
MCS20-230/24-UPS: 230 V AC input, 24 V DC / 20 A with integrated UPS buffer function

Sourcing Hard-to-Find & Obsolete MCS20 Parts

DriveKNMS maintains a dedicated inventory program for MCS20 series units that have been discontinued or placed on extended lead time by Murrelektronik's authorized distribution network. Our sourcing protocol covers three supply tiers: (1) new-old-stock (NOS) units from verified industrial surplus channels, (2) factory-refurbished exchange units tested to OEM output specifications, and (3) functional used units from decommissioned panels, subject to full electrical inspection before dispatch. For plant operators running legacy Siemens SIMATIC, ABB System 800xA, or Yokogawa CENTUM VP panels where the MCS20 is the specified 24 V DC rail supply, we provide cross-reference matching to confirm compatibility before shipment. Minimum order quantities are not enforced — single-unit emergency orders are accepted. Average dispatch lead time for in-stock MCS20 units is 2–5 business days globally.

Quality Control for the MCS20 Range

Each MCS20 unit processed by DriveKNMS undergoes a structured electrical test sequence before dispatch. AC input is applied at rated voltage (230 V AC or 100–240 V AC depending on variant) and the output voltage is verified at no-load, 50% load, and full rated load using calibrated electronic loads. Output ripple and noise are measured per EN 61204-3 (≤ 150 mV peak-to-peak at full load). For units equipped with the DC-OK relay contact, contact closure and release thresholds are verified against the datasheet specification (typically DC-OK opens below 21 V DC). Thermal performance is validated by operating the unit at full load for a minimum 30-minute burn-in period with ambient temperature monitoring. Units exhibiting output voltage deviation exceeding ±2% from nominal, excessive ripple, or abnormal thermal behavior are quarantined and not dispatched. All test results are logged and available upon request with shipment documentation.