ABB MS495 1SAM550000R1008 Migration-Ready Motor Starter

Overview

ABB MS495 1SAM550000R1008 Migration-Ready Manual Motor Starter: Legacy System Retrofit and Control Upgrade

The ABB MS495 (part number 1SAM550000R1008) is a migration-ready manual motor starter engineered for direct replacement of discontinued MS Series protective devices in legacy motor control centers, control cabinets, and standalone starter panels. As ABB progressively phases out older MS-range variants, the MS495 serves as the recommended upgrade path — preserving existing wiring layouts, DIN rail mounting footprints, and motor protection logic without requiring panel redesign or PLC program modification.

For maintenance engineers managing aging automation infrastructure, the MS495 addresses the most critical retrofit constraints: terminal pitch compatibility, current setting range continuity, and trip class alignment. The unit ships pre-tested and calibrated, with a support terms confirmed by quotation covering both component integrity and trip function accuracy. In-stock inventory supports same-week dispatch for urgent breakdown replacements and planned shutdown windows alike.

Migration Compatibility Table

Retrofit Planning for Existing Automation Systems

Successful integration of the MS495 into a legacy motor control system requires a structured pre-installation review. Begin by auditing the existing control cabinet layout: confirm the available DIN rail slot width (45 mm minimum), verify that adjacent components — such as ABB S200 series MCBs or terminal blocks — allow adequate clearance for the MS495 body and any snap-on accessories.

For motor feeders previously protected by older ABB MS325 or MS450 starters, the MS495 provides a functionally equivalent replacement. The current adjustment dial must be set to match the motor’s full-load ampere (FLA) rating from the motor nameplate. Where the legacy installation used an ABB NHI11 or NHI20 auxiliary contact block for interlock or status signaling back to a PLC input card, verify that the same auxiliary block model is compatible with the MS495 housing before reuse — or source a replacement NHI-series block accordingly.

In control cabinets where the motor starter feeds a contactor — such as an ABB A-series contactor (A9, A12, A16, or A26) — the downstream wiring from the MS495 load terminals connects directly to the contactor line terminals. No rewiring of the contactor coil circuit or PLC output module is required, as the MS495 operates as a purely electromechanical protective device upstream of the contactor.

For systems incorporating an ABB CP range 24 VDC power supply module feeding PLC I/O racks or HMI panels, confirm that the MS495 installation does not alter the load balance on the distribution busbar. In multi-feeder panels, each motor branch should be individually protected; the MS495 is rated for individual motor branch protection and should not be used as a group protection device without engineering review.

Where the legacy system used a PROFIBUS DP or PROFINET communication link between a motor management relay and the PLC CPU — for example, an ABB UMC100.3 motor controller — the MS495 itself does not participate in the communication network. It functions as the upstream manual protective device, while the UMC100.3 handles overload monitoring, communication, and remote trip signaling. This architecture is preserved unchanged during the MS495 retrofit.

Finally, for installations where an ABB CP600 or similar HMI panel displays motor status via PLC tags linked to auxiliary contact inputs, confirm that the auxiliary contact wiring from the MS495 NHI block is correctly mapped to the existing PLC input address. No HMI screen modification is required if the input tag address is preserved.

Downtime Control During System Migration

Minimizing production downtime during a manual motor starter replacement requires advance preparation and a disciplined on-site procedure. Before the scheduled maintenance window, obtain the MS495 1SAM550000R1008 unit and verify it against the original motor protection specification: current range, trip class, and auxiliary contact configuration. Pre-stage all tools, terminal labels, and torque specifications to reduce time spent on-site.

During the shutdown, photograph the existing terminal wiring before disconnection. Label each conductor with its terminal designation from the original wiring diagram. Disconnect the load-side and line-side cables from the legacy starter, remove the unit from the DIN rail, and install the MS495 in the same slot. Reconnect conductors to the corresponding terminals on the MS495 — line input to L1/L2/L3, load output to T1/T2/T3 — and torque to the manufacturer’s specification.

Before restoring power, perform a continuity check across the main contacts with the MS495 in the ON position, and verify the trip mechanism by manually actuating the test function if available. Confirm that the auxiliary contact output is correctly wired to the PLC input and that the PLC program logic for motor run permissive and fault interlock is intact. Restore power to the panel, energize the motor feeder, and verify motor start, run, and stop sequences under no-load conditions before returning the system to production.

This structured approach — pre-staging, documented disconnection, verified reconnection, and functional test before production restart — typically limits the replacement window to under 60 minutes for a single motor feeder, preserving control system continuity and reducing the risk of commissioning errors.

Retrofit Support FAQ

Q1: Is the ABB MS495 1SAM550000R1008 a direct replacement for discontinued ABB MS325 and MS450 manual motor starters?
A: The MS495 is the recommended upgrade path for legacy MS-range starters. Terminal pitch and DIN rail mounting are compatible in most standard panel configurations. Verify the current setting range against the motor FLA and confirm auxiliary contact block compatibility before installation. Where the original unit used a different trip class, review the motor application requirements before proceeding.

Q2: Does replacing the manual motor starter require any PLC program changes or HMI screen updates?
A: No. The MS495 is an electromechanical device with no communication interface. It does not interact with the PLC program directly. Provided the auxiliary contact wiring is reconnected to the same PLC input address and the input tag mapping is preserved, no PLC logic or HMI screen modification is required.

Q3: What pre-shipment testing is performed, and is a test certificate available?
A: Each MS495 unit undergoes trip function verification and electrical continuity testing before dispatch. A test certificate confirming these checks is available on request. Units are shipped with factory settings intact; the current adjustment dial should be set on-site to match the specific motor FLA.

Q4: What is the support terms coverage and lead time for the ABB MS495 1SAM550000R1008?
A: The unit carries a support terms confirmed by quotation covering the trip mechanism, main contacts, housing integrity, and auxiliary contact function. In-stock units are dispatched within 1–3 business days. For urgent breakdown replacements, contact the sales team directly to confirm same-day dispatch availability.

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Product Identification

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ABB
ABB

Model / Series

MS495 1SAM550000R1008

Product Family

Servo Systems

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Available on request after model and quantity confirmation

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B2B RFQ, replacement inquiry and project spare-part request

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Motion range

Servo drives, motors and cable sets

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Power, encoder and brake confirmation

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Motion upgrade and spare-part supply

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