ABB 1MRK000157-MBR00 Circuit Board — 12-Pin In, 24-Pin Backplane Out, 8-Pin Aux Layout

Description

The 1MRK000157-MBR00 is a DCS-system power and backplane distribution circuit board manufactured by ABB, originating from ABB’s Swedish product lineage and positioned within the broader 1MRK / DCS spare-card family. Rather than functioning as a standalone DIN-rail PSU, it sits inside an ABB DCS rack (commonly alongside AC800M controllers and S800 I/O slices), taking incoming primary power and distributing it across the backplane while supplying an auxiliary 24 V DC tap for local logic and monitoring.

The 1MRK000157-MBR00 is built as a hotswappable PCB assembly—plug-and-play by design—so service teams can replace a degraded unit without powering down the entire rack, provided the system redundancy allows. With a 48–250 V DC / 100–240 V AC primary input range, 2.5 kV input/output isolation, and <1 % output ripple, it is tuned for the electrically noisy environment of process-control cabinets where VFDs, contactors, and multi-rack DCS nodes share the same enclosure.

Application Scenarios

On a Scandinavian pulp-and-paper line running three AC800M racks per section, the maintenance crew had inherited a headache: the original DCS power cards in Rack B would occasionally drop the 24 V auxiliary rail whenever a 160 kW digester-agitator VFD staged on, and because the old cards weren’t reliably hotswappable, every replacement meant a 15-minute rack-level shutdown—twice a month, always at the worst moment. Swapping in the 1MRK000157-MBR00 cleaned two problems at once. First, the 2.5 kV isolation between input and output broke the ground-loop path that had been coupling VFD switching noise onto the backplane; second, the hotswap mechanicals let the night shift pull the failing card and seat a spare while the redundant controller in Rack A carried the load. Post-retrofit, the “Rack B 24 V Aux Loss” alarm vanished for six consecutive months, and the plant standardized the 1MRK000157-MBR00 across all three lines. For any facility still running mixed-age ABB DCS spares, keeping a couple of 1MRK000157-MBR00 boards on the shelf tends to beat arguing with obsolete card availability.

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Description

Parameter

Main Parameters	Value/Description
Product Model	1MRK000157-MBR00
Manufacturer	ABB (Sweden origin)
Product Category	DCS Power / Backplane Circuit Board
Primary Input	48–250 V DC or 100–240 V AC
Auxiliary Input	24 V DC
Input/Output Isolation	2.5 kV (primary side to backplane/output side)
Connector Layout	12-pin power in / 24-pin backplane out / 8-pin auxiliary
Input Power Rating	20–60 W
Output Ripple Noise	< 1 % of output voltage
Shipping Dimensions	4.2 × 19.5 × 23.2 cm
Weight	3.14 kg
Tariff / Country	8537101190 / Sweden
Key Features	Hotswappable, plug-and-play, DCS rack mount

Technical Principles and Innovative Values

Innovation Point 1: Wide-Range Primary Input with 2.5 kV Isolation. The 1MRK000157-MBR00 accepts everything from 48 V DC battery-backed UPS rails to 240 V AC mains on the same primary connector, and galvanically isolates the input from the backplane side at 2.5 kV. In a process cabinet where a 400 V VFD and a 230 V AC800M rack sit side-by-side, that isolation is what keeps VFD dV/dt from walking onto the DCS 24 V auxiliary rail.
Innovation Point 2: Hotswappable PCB Mechanicals. The card is designed to be extracted and reinserted without a full rack power-down—provided the DCS node has redundancy (controller B, redundant PSU, or N+1 card layout). The 1MRK000157-MBR00 uses the same guide-rail and latch geometry as the rest of the 1MRK DCS card family, so a swap takes under three minutes with a wrist strap and a flashlamp.
Innovation Point 3: <1 % Ripple, 20–60 W Regulated Distribution. Unlike a bare pass-transistor distribution block, the 1MRK000157-MBR00 actively regulates and filters, keeping ripple under 1 % of output voltage. That matters when the backplane is feeding sensitive S800 analog input slices or communications coprocessors where rail noise shows up as low-order measurement drift.

Application Cases and Industry Value

A regional combined-cycle power plant in Southeast Asia ran its balance-of-plant DCS on a mix of 1MRK-series cards dating back 12+ years. One evening during monsoon season, a ground-fault transient on the 230 V AC service panel propagated through the old, marginally isolated power card in Rack C, tripping the 24 V aux and forcing a turbine bypass sequence. The post-event audit called for upgrading all DCS power cards to the 1MRK000157-MBR00 specifically for the 2.5 kV isolation and the wider 48–250 V DC input (the site was adding a 110 V DC battery-backed UPS ring). After the swap-out across 18 racks, the plant went through the next two monsoon seasons with zero DCS-power-related trips. The electrical lead’s note in the closure report: “One part number, three rack types, no adapter harnesses—finally.”In a smaller-scale case, a system integrator supporting several municipal water-treatment sites replaced a discontinued third-party DCS power card with the 1MRK000157-MBR00 in a tight S800 cabinet where depth was <25 cm. The 12/24/8-pin layout matched the original backplane harness with only a minor pin-map label update, and the hotswap feature let them do the swap during a scheduled 30-minute pump rotation rather than a full-night outage.