{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MR-J4-20B","brand":"Mitsubishi Electric","brandSlug":"mitsubishi","productSlug":"MR-J4-20B","canonicalUrl":"https://aoctrl.com/mitsubishi/MR-J4-20B","factsUrl":"https://aoctrl.com/api/mcp/products/MR-J4-20B","rawCanonicalId":null},"summary":{"shortDescription":"Mitsubishi MELSERVO-J4 series, MR-J4-20B servo amplifier, 200V class, 0.2 kW rated output, SSCNET/H interface, STO safety, IP20.","salesMarkdown":"The Mitsubishi MR-J4-20B is a MELSERVO-J4 series servo amplifier rated for 0.2 kW motor output on a 200 V class supply, accepting single-phase or three-phase AC200 V to 240 V at 50/60 Hz. It drives a compatible servo motor via sinusoidal-wave PWM current control and communicates over the SSCNET/H high-speed motion network. The amplifier includes a built-in dynamic brake and integrates STO (Safe Torque Off) per IEC/EN 61800-5-2, with an STO response time of 8 ms or less from input off to energy cut-off. Rated current is listed at 0.2 A (with a separate note value of 1.5 A under specific conditions), and the amplifier draws 30 W of power. The output stage delivers three-phase AC170 V to the motor. The 0.2 kW motor output rating sizes this amplifier for small-axis applications — think indexing tables, pick-and-place grippers, or conveyor diverters. The 200 V class input (single-phase or three-phase AC200 V to 240 V, ±5 % frequency tolerance) means it fits standard low-voltage industrial mains in most regions, but verify your line voltage stays within the allowable fluctuation of AC170 V to 264 V single-phase. The SSCNET/H interface is a high-speed synchronous serial bus specific to Mitsubishi motion networks. If your controller is not SSCNET/H-capable, this amplifier will not communicate — there is no built-in pulse-train or analog input on this model. The USB port on the front is for PC connection only (MR Configurator2 setup software), not for real-time motion control. STO (Safe Torque Off) per IEC/EN 61800-5-2 with medium diagnostic coverage (DC = 97.6 %) means the amplifier can be integrated into a safety circuit up to a certain performance level without an external safety relay for the torque-off function — useful for clearing jammed material without removing power from the whole cabinet. ## Where it goes and what it connects to Mounts inside a standard IP20 control cabinet. The amplifier accepts a Mitsubishi high-speed serial communication encoder interface on the motor end, and provides ABZ-phase encoder output pulses for external position monitoring. Two analog monitor channels are available for tuning or troubleshooting with an oscilloscope. Power for the control logic comes from a separate DC24 V ± 10 % supply, requiring 0.3 A on the CN8 connector signal. The main power input can be single-phase or three-phase — check Note 6 in the manual for wiring restrictions depending on your configuration.","metaTitle":"Mitsubishi MR-J4-20B MELSERVO-J4 Servo Amplifier, 0.2 kW","metaDescription":"Mitsubishi MR-J4-20B MELSERVO-J4 servo amplifier, 0.2 kW, 200V class, STO safety, SSCNET/H interface. Current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Servo Drives"],"specifications":{"Weight":"0.8 Kg","Elevation":"Above sea level 2000 m or less (Note 18)","Atmosphere":"Indoors (no direct sunlight), that there is no corrosive gas, flammable gas, oil mist, dust and dirt","Product no":"MR-J4-20B","Manufacturer":"Mitsubishi Electric","Product type":"MELSERVO-J4 series Servo Amplifier","Dynamic brake":"Built-in (Note 4)","Voltage class":"200V","Analog monitor":"2 channel","Control Method":"Sinusoidal wave PWM control and current control system","Safety feature":"STO (IEC / EN 61800-5-2)","Servo function":"Advanced vibration suppression control ?, adaptive filter ?, robust filter, auto-tuning, one-touch adjustment, tough drive function, drive recorder function, control the pushing, machine diagnostic functions, the power monitor function, the master slave operation function (Note 14), scale measurement function (Note 14), J3 compatibility mode, super trace control (Note 16), lost motion correction function (Note 16)","Shipping Weight":"2 Kg","lifecycle_stage":"current","Ambient humidity":"Operation / storage: 90% RH or less (non-condensing)","Command interface":"SSCNET? / H interface","Rated current [A]":"0.2","Ambient temperature":"Operation: 0 ° C ~ 55 ° C (no freezing), storage: -20 ° C ~ 65 ° C (no freezing)","Estimated Lead Time":"Usually ships in 1-10 working days.","Full-closed control":"2-wire communication method (Note 9)","Interface for power":"DC24 V ± 10% (required current capacity: including a 0.3 A (CN8 connector signal))","Overseas Compliance":"The correspondence to the international standards and laws.","Protective function":"Over-current cut-off, regenerative overvoltage shut-off, overload shut-off (electronic thermal), servo motor overheating protection, encoder error protection, regenerative error protection, undervoltage protection, instantaneous power failure protection, overspeed protection, excessive error protection, magnetic pole detection and protection, linear servo control error protection","Encoder output pulse":"Correspondence (ABZ-phase pulse)","Response performance":"8 ms or less (STO input off ? energy cut-off)","Vibration resistance":"Yd 5.9 / s 2 , 10 Hz ~ 55 Hz (X-, Y-, Z-each direction)","output Rated voltage":"Three-phase AC170 V","Power consumption [W]":"Thirty","Voltage and frequency":"Single-phase AC200 V ~ 240 V, 50 Hz / 60 Hz","Communication function":"USB: connection to a personal computer (MR Configurator2 correspondence)","Motor rated output [KW]":"0.2","Diagnostic coverage (DC)":"DC = medium (Medium), 97.6 [%]","Servo amplifier form name":"MR-J4-20B","Rated current (Note 15) [A]":"1.5","Structure (protection grade)":"Self-cooling, open (IP20)","Allowable voltage fluctuation":"Single-phase AC170 V ~ 264 V","Machine end encoder interface":"Mitsubishi high-speed serial communication","Three-phase power supply input":"Yes (Note 6)","Voltage and frequency (Note 1)":"Three-phase or single-phase AC200 V ~ 240 V, 50 Hz / 60 Hz","Allowable frequency fluctuation":"Within ± 5%","Single-phase power supply input":"Yes (Note 6)","Test pulse input (STO) (Note 7)":"Test pulse interval: 1 Hz ~ 25 Hz, test pulse off time: Up to 1 ms","Third party certification standards":"EN ISO 13849-1 Category 3 PL e, IEC 61508 SIL 3, EN 62061 SIL CL 3, EN 61800-5-2 (Note 20)","Expected average dangerous failure time (MTTFd)":"MTTFd ? 100 [year] (314a)","SSCNET? / H command communication period (Note 10)":"0.222 ms, 0.444 ms, 0.888 ms","The average probability of a dangerous failure (PFH)":"= 6.4 × PFH 10 -9 [1 / H]","Servo amplifier built-in regenerative resistor (Note 2, 3) [W]":"Ten"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$690.00 – $704.85","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d6c368af449ef4699186811fff199fc5.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/MR-J4-20B/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation does Mitsubishi provide for the MR-J4-20B?","answer":"The amplifier carries overseas compliance to international standards and laws, including the STO safety function per IEC/EN 61800-5-2. Specific RoHS, REACH, and UL declarations are part of the standard documentation package available from Mitsubishi."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/mitsubishi/MR-J4-20B","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/mitsubishi/MR-J4-20B when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}