AJ55TB3-4D Mitsubishi MELSEC-I/OLINK remote I/O module

MPN: AJ55TB3-4D · Brand: Mitsubishi Electric (Factory Automation)

Price on request

Discontinued by Mitsubishi Electric (Factory Automation) — we can still source the original AJ55TB3-4D (new, used or refurbished, subject to availability). Request a quote below.

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12-month warranty (new) · 3-month (used/refurbished)

30-day returns, no restocking fee on unused parts

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Quick facts

Availability	Confirmed on request
Category	Mitsubishi MELSEC I/OLINK, MELSECNET & A-Series Network Modules
Lifecycle	Discontinued
Warranty	12-month (new) · 3-month (used/refurbished)
Recommended replacement	A20SB-04U, A20SB-04US, CL1X4-D1B2

Shipping & availability

Can I still buy the AJ55TB3-4D now that it is discontinued?

Yes. Mitsubishi Electric (Factory Automation) has discontinued the AJ55TB3-4D, but sourcing discontinued parts is what PartnerPLC specialises in — new old stock, used and refurbished units. Request a quote and we'll confirm availability, condition and lead time. If you are planning an upgrade instead, Mitsubishi Electric (Factory Automation) names the A20SB-04U as its successor — we can quote both.

When can AJ55TB3-4D be shipped?

AJ55TB3-4D is sourced on request — request a quote and we'll confirm the exact availability and shipping timeline for this specific unit.

Can I pick up AJ55TB3-4D in person?

Local pickup from our Groningen, Netherlands warehouse may be possible — contact us before ordering to check availability and arrange a collection time.

Is express delivery available?

Yes — mention it when you request a quote for AJ55TB3-4D and we'll include express shipping options in our reply.

My factory is down and I need this urgently — can you help?

For a critical breakdown, contact us directly at +31 (0)50-7110348 or sales@partnerplc.com — we can look into same-day courier or dedicated taxi/hotshot delivery for AJ55TB3-4D, subject to availability and destination.

Mitsubishi Electric AJ55TB3-4D — MELSEC-I/OLINK remote I/O module, MELSEC-A Series network / I/OLINK. Discontinued by Mitsubishi Electric. Mitsubishi names A20SB-04U, A20SB-04US as alternative. PartnerPLC sources discontinued and surplus Mitsubishi MELSEC parts — request a quote for price, condition and lead time.

Specifications

Product

Lifecycle	Discontinued by Mitsubishi Electric
Series	MELSEC-A Series network / I/OLINK
Product type	MELSEC-I/OLINK remote I/O module
Mitsubishi technical bulletin	FA-A-0142-C
Mitsubishi alternative model(s)	A20SB-04U, A20SB-04US, CL1X4-D1B2

Transition notes to A20SB-04U (Mitsubishi)

Note 1	1) External wiring: Changed
Note 2	2) Number of modules: Not changed
Note 3	3) Program: Changed
Note 4	4) Specifications:
Note 5	Rated input voltage: Not changed
Note 6	Rated input current: Not changed
Note 7	ON voltage/ON current: Changed
Note 8	OFF voltage/OFF current: Changed
Note 9	Input resistance: Not changed
Note 10	5) Functions: Changed (wiring: 3-wire 2-wire) (A negative common type cannot be used.)
Note 11	1) External wiring: Changed
Note 12	2) Number of modules: Not changed
Note 13	3) Program: Changed
Note 14	4) Specifications: