Mitsubishi Electric · MELSERVO-J2S · Servo drive

Mitsubishi Electric MR-J2S-40A

DiscontinuedHIGH

What should replace this part?

Your options

Our analysisMR-J4-40A + HG-KR43 kit SC-J2SJ4KT06K

OEM renewal mapping states amplifier MR-J4-40A plus motor HG-KR43 with kit SC-J2SJ4KT06K; parameter, SSCNET and mounting rework required.

Our analysisRepair / used probe (unverified)

OEM repair window expired Aug 2022; exact-model Tier C repair and used channels unverified — probe with nameplate data.

Replacement analysis

Original: MR-J2S-40A (MR-J2S 400W servo amplifier)

↓

Replacement: MR-J4-40A + HG-KR43 motor + kit SC-J2SJ4KT06K

Relationship: OEM replacement (engineering work still required) HIGH

Migration / engineering work required — not a drop-in. This is not presented as a drop-in replacement.

Analyst note: AUDIT-CONFIRMED HIGH. Amp AND motor both change; SSCNET->III/H; MR Configurator2.

What changes?

Hardware	Amplifier AND motor both change (HC-KFS43 to HG-KR43); mounting dimensions must be checked with the renewal kit.
Wiring	Power, encoder and brake conversion cables; connector shape, pinout and location differ.
Communications	SSCNET converts to SSCNET III/H; B-type axes need a conversion unit.
Software	MR Configurator gives way to MR Configurator2 with parameter conversion rules.

Anything not listed here is unknown — the evidence does not establish it.

Can I still buy the original?

Repair: Unknown — not verifiedUsed: Unknown — not verifiedRefurbished: Unknown — not verified

New-original availability is not claimed unless evidence supports it. Availability is never implied by the existence of a listing alone.

Lifecycle

Status: Discontinued

Discontinuation date: 2015-08 (repair to 2022-08)

Lifecycle source

Evidence

Every important claim traces to a source below. OEM source means the manufacturer published it; third-party source means a distributor, repair company or reseller states it; our analysis connects them — and is labeled as such.

OEM / manufacturer sources

OEM source HIGH Mitsubishi Electric · Tier A

MR-J2S Introduced 1999 - Discontinued 2015; repair until Aug 2022; MR-J4 recommended

“Lifecycle: Introduced (1999) - Discontinued (2015) / Service Life: Repair Service is available until August 2022.”

Establishes: oem_replacement · View source · Note: Fetched; AUDIT-CONFIRMED

OEM source HIGH Mitsubishi Electric · Tier A

MR-J2S-40A + HC-KFS43 maps to MR-J4-40A + HG-KR43 with kit SC-J2SJ4KT06K

“MR-J2S-40A HC-KFS43(B) to MR-J4-40A SC-J2SJ4KT06K HG-KR43(B)”

Establishes: oem_replacement · View source · Note: Exact-model renewal mapping; AUDIT-CONFIRMED

Why you might be searching this

J2S axis down with no OEM repair; what does the J4 kit require beyond the amplifier?

Need help deciding between repair, replacement, or migration?

Request a replacement review for MR-J2S-40A — repair assessment, sourced original, replacement quote, or migration scoping.

Request a replacement review

Research status: done. Confidence HIGH reflects the evidence above, not marketing. Commercial paths: MR-J4 kit quote · Migration scoping · Repair / used probe. No search-volume, pricing or revenue claims are made on this page.